commit the poc code

.gitattributes

+/mvnw text eol=lf
+*.cmd text eol=crlf

.gitignore

+HELP.md
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/

.mvn/wrapper/maven-wrapper.properties

+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+wrapperVersion=3.3.2
+distributionType=only-script
+distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.9.9/apache-maven-3.9.9-bin.zip

mvnw

+#!/bin/sh
+# ----------------------------------------------------------------------------
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+# ----------------------------------------------------------------------------
+
+# ----------------------------------------------------------------------------
+# Apache Maven Wrapper startup batch script, version 3.3.2
+#
+# Optional ENV vars
+# -----------------
+#   JAVA_HOME - location of a JDK home dir, required when download maven via java source
+#   MVNW_REPOURL - repo url base for downloading maven distribution
+#   MVNW_USERNAME/MVNW_PASSWORD - user and password for downloading maven
+#   MVNW_VERBOSE - true: enable verbose log; debug: trace the mvnw script; others: silence the output
+# ----------------------------------------------------------------------------
+
+set -euf
+[ "${MVNW_VERBOSE-}" != debug ] || set -x
+
+# OS specific support.
+native_path() { printf %s\\n "$1"; }
+case "$(uname)" in
+CYGWIN* | MINGW*)
+  [ -z "${JAVA_HOME-}" ] || JAVA_HOME="$(cygpath --unix "$JAVA_HOME")"
+  native_path() { cygpath --path --windows "$1"; }
+  ;;
+esac
+
+# set JAVACMD and JAVACCMD
+set_java_home() {
+  # For Cygwin and MinGW, ensure paths are in Unix format before anything is touched
+  if [ -n "${JAVA_HOME-}" ]; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ]; then
+      # IBM's JDK on AIX uses strange locations for the executables
+      JAVACMD="$JAVA_HOME/jre/sh/java"
+      JAVACCMD="$JAVA_HOME/jre/sh/javac"
+    else
+      JAVACMD="$JAVA_HOME/bin/java"
+      JAVACCMD="$JAVA_HOME/bin/javac"
+
+      if [ ! -x "$JAVACMD" ] || [ ! -x "$JAVACCMD" ]; then
+        echo "The JAVA_HOME environment variable is not defined correctly, so mvnw cannot run." >&2
+        echo "JAVA_HOME is set to \"$JAVA_HOME\", but \"\$JAVA_HOME/bin/java\" or \"\$JAVA_HOME/bin/javac\" does not exist." >&2
+        return 1
+      fi
+    fi
+  else
+    JAVACMD="$(
+      'set' +e
+      'unset' -f command 2>/dev/null
+      'command' -v java
+    )" || :
+    JAVACCMD="$(
+      'set' +e
+      'unset' -f command 2>/dev/null
+      'command' -v javac
+    )" || :
+
+    if [ ! -x "${JAVACMD-}" ] || [ ! -x "${JAVACCMD-}" ]; then
+      echo "The java/javac command does not exist in PATH nor is JAVA_HOME set, so mvnw cannot run." >&2
+      return 1
+    fi
+  fi
+}
+
+# hash string like Java String::hashCode
+hash_string() {
+  str="${1:-}" h=0
+  while [ -n "$str" ]; do
+    char="${str%"${str#?}"}"
+    h=$(((h * 31 + $(LC_CTYPE=C printf %d "'$char")) % 4294967296))
+    str="${str#?}"
+  done
+  printf %x\\n $h
+}
+
+verbose() { :; }
+[ "${MVNW_VERBOSE-}" != true ] || verbose() { printf %s\\n "${1-}"; }
+
+die() {
+  printf %s\\n "$1" >&2
+  exit 1
+}
+
+trim() {
+  # MWRAPPER-139:
+  #   Trims trailing and leading whitespace, carriage returns, tabs, and linefeeds.
+  #   Needed for removing poorly interpreted newline sequences when running in more
+  #   exotic environments such as mingw bash on Windows.
+  printf "%s" "${1}" | tr -d '[:space:]'
+}
+
+# parse distributionUrl and optional distributionSha256Sum, requires .mvn/wrapper/maven-wrapper.properties
+while IFS="=" read -r key value; do
+  case "${key-}" in
+  distributionUrl) distributionUrl=$(trim "${value-}") ;;
+  distributionSha256Sum) distributionSha256Sum=$(trim "${value-}") ;;
+  esac
+done <"${0%/*}/.mvn/wrapper/maven-wrapper.properties"
+[ -n "${distributionUrl-}" ] || die "cannot read distributionUrl property in ${0%/*}/.mvn/wrapper/maven-wrapper.properties"
+
+case "${distributionUrl##*/}" in
+maven-mvnd-*bin.*)
+  MVN_CMD=mvnd.sh _MVNW_REPO_PATTERN=/maven/mvnd/
+  case "${PROCESSOR_ARCHITECTURE-}${PROCESSOR_ARCHITEW6432-}:$(uname -a)" in
+  *AMD64:CYGWIN* | *AMD64:MINGW*) distributionPlatform=windows-amd64 ;;
+  :Darwin*x86_64) distributionPlatform=darwin-amd64 ;;
+  :Darwin*arm64) distributionPlatform=darwin-aarch64 ;;
+  :Linux*x86_64*) distributionPlatform=linux-amd64 ;;
+  *)
+    echo "Cannot detect native platform for mvnd on $(uname)-$(uname -m), use pure java version" >&2
+    distributionPlatform=linux-amd64
+    ;;
+  esac
+  distributionUrl="${distributionUrl%-bin.*}-$distributionPlatform.zip"
+  ;;
+maven-mvnd-*) MVN_CMD=mvnd.sh _MVNW_REPO_PATTERN=/maven/mvnd/ ;;
+*) MVN_CMD="mvn${0##*/mvnw}" _MVNW_REPO_PATTERN=/org/apache/maven/ ;;
+esac
+
+# apply MVNW_REPOURL and calculate MAVEN_HOME
+# maven home pattern: ~/.m2/wrapper/dists/{apache-maven-<version>,maven-mvnd-<version>-<platform>}/<hash>
+[ -z "${MVNW_REPOURL-}" ] || distributionUrl="$MVNW_REPOURL$_MVNW_REPO_PATTERN${distributionUrl#*"$_MVNW_REPO_PATTERN"}"
+distributionUrlName="${distributionUrl##*/}"
+distributionUrlNameMain="${distributionUrlName%.*}"
+distributionUrlNameMain="${distributionUrlNameMain%-bin}"
+MAVEN_USER_HOME="${MAVEN_USER_HOME:-${HOME}/.m2}"
+MAVEN_HOME="${MAVEN_USER_HOME}/wrapper/dists/${distributionUrlNameMain-}/$(hash_string "$distributionUrl")"
+
+exec_maven() {
+  unset MVNW_VERBOSE MVNW_USERNAME MVNW_PASSWORD MVNW_REPOURL || :
+  exec "$MAVEN_HOME/bin/$MVN_CMD" "$@" || die "cannot exec $MAVEN_HOME/bin/$MVN_CMD"
+}
+
+if [ -d "$MAVEN_HOME" ]; then
+  verbose "found existing MAVEN_HOME at $MAVEN_HOME"
+  exec_maven "$@"
+fi
+
+case "${distributionUrl-}" in
+*?-bin.zip | *?maven-mvnd-?*-?*.zip) ;;
+*) die "distributionUrl is not valid, must match *-bin.zip or maven-mvnd-*.zip, but found '${distributionUrl-}'" ;;
+esac
+
+# prepare tmp dir
+if TMP_DOWNLOAD_DIR="$(mktemp -d)" && [ -d "$TMP_DOWNLOAD_DIR" ]; then
+  clean() { rm -rf -- "$TMP_DOWNLOAD_DIR"; }
+  trap clean HUP INT TERM EXIT
+else
+  die "cannot create temp dir"
+fi
+
+mkdir -p -- "${MAVEN_HOME%/*}"
+
+# Download and Install Apache Maven
+verbose "Couldn't find MAVEN_HOME, downloading and installing it ..."
+verbose "Downloading from: $distributionUrl"
+verbose "Downloading to: $TMP_DOWNLOAD_DIR/$distributionUrlName"
+
+# select .zip or .tar.gz
+if ! command -v unzip >/dev/null; then
+  distributionUrl="${distributionUrl%.zip}.tar.gz"
+  distributionUrlName="${distributionUrl##*/}"
+fi
+
+# verbose opt
+__MVNW_QUIET_WGET=--quiet __MVNW_QUIET_CURL=--silent __MVNW_QUIET_UNZIP=-q __MVNW_QUIET_TAR=''
+[ "${MVNW_VERBOSE-}" != true ] || __MVNW_QUIET_WGET='' __MVNW_QUIET_CURL='' __MVNW_QUIET_UNZIP='' __MVNW_QUIET_TAR=v
+
+# normalize http auth
+case "${MVNW_PASSWORD:+has-password}" in
+'') MVNW_USERNAME='' MVNW_PASSWORD='' ;;
+has-password) [ -n "${MVNW_USERNAME-}" ] || MVNW_USERNAME='' MVNW_PASSWORD='' ;;
+esac
+
+if [ -z "${MVNW_USERNAME-}" ] && command -v wget >/dev/null; then
+  verbose "Found wget ... using wget"
+  wget ${__MVNW_QUIET_WGET:+"$__MVNW_QUIET_WGET"} "$distributionUrl" -O "$TMP_DOWNLOAD_DIR/$distributionUrlName" || die "wget: Failed to fetch $distributionUrl"
+elif [ -z "${MVNW_USERNAME-}" ] && command -v curl >/dev/null; then
+  verbose "Found curl ... using curl"
+  curl ${__MVNW_QUIET_CURL:+"$__MVNW_QUIET_CURL"} -f -L -o "$TMP_DOWNLOAD_DIR/$distributionUrlName" "$distributionUrl" || die "curl: Failed to fetch $distributionUrl"
+elif set_java_home; then
+  verbose "Falling back to use Java to download"
+  javaSource="$TMP_DOWNLOAD_DIR/Downloader.java"
+  targetZip="$TMP_DOWNLOAD_DIR/$distributionUrlName"
+  cat >"$javaSource" <<-END
+	public class Downloader extends java.net.Authenticator
+	{
+	  protected java.net.PasswordAuthentication getPasswordAuthentication()
+	  {
+	    return new java.net.PasswordAuthentication( System.getenv( "MVNW_USERNAME" ), System.getenv( "MVNW_PASSWORD" ).toCharArray() );
+	  }
+	  public static void main( String[] args ) throws Exception
+	  {
+	    setDefault( new Downloader() );
+	    java.nio.file.Files.copy( java.net.URI.create( args[0] ).toURL().openStream(), java.nio.file.Paths.get( args[1] ).toAbsolutePath().normalize() );
+	  }
+	}
+	END
+  # For Cygwin/MinGW, switch paths to Windows format before running javac and java
+  verbose " - Compiling Downloader.java ..."
+  "$(native_path "$JAVACCMD")" "$(native_path "$javaSource")" || die "Failed to compile Downloader.java"
+  verbose " - Running Downloader.java ..."
+  "$(native_path "$JAVACMD")" -cp "$(native_path "$TMP_DOWNLOAD_DIR")" Downloader "$distributionUrl" "$(native_path "$targetZip")"
+fi
+
+# If specified, validate the SHA-256 sum of the Maven distribution zip file
+if [ -n "${distributionSha256Sum-}" ]; then
+  distributionSha256Result=false
+  if [ "$MVN_CMD" = mvnd.sh ]; then
+    echo "Checksum validation is not supported for maven-mvnd." >&2
+    echo "Please disable validation by removing 'distributionSha256Sum' from your maven-wrapper.properties." >&2
+    exit 1
+  elif command -v sha256sum >/dev/null; then
+    if echo "$distributionSha256Sum  $TMP_DOWNLOAD_DIR/$distributionUrlName" | sha256sum -c >/dev/null 2>&1; then
+      distributionSha256Result=true
+    fi
+  elif command -v shasum >/dev/null; then
+    if echo "$distributionSha256Sum  $TMP_DOWNLOAD_DIR/$distributionUrlName" | shasum -a 256 -c >/dev/null 2>&1; then
+      distributionSha256Result=true
+    fi
+  else
+    echo "Checksum validation was requested but neither 'sha256sum' or 'shasum' are available." >&2
+    echo "Please install either command, or disable validation by removing 'distributionSha256Sum' from your maven-wrapper.properties." >&2
+    exit 1
+  fi
+  if [ $distributionSha256Result = false ]; then
+    echo "Error: Failed to validate Maven distribution SHA-256, your Maven distribution might be compromised." >&2
+    echo "If you updated your Maven version, you need to update the specified distributionSha256Sum property." >&2
+    exit 1
+  fi
+fi
+
+# unzip and move
+if command -v unzip >/dev/null; then
+  unzip ${__MVNW_QUIET_UNZIP:+"$__MVNW_QUIET_UNZIP"} "$TMP_DOWNLOAD_DIR/$distributionUrlName" -d "$TMP_DOWNLOAD_DIR" || die "failed to unzip"
+else
+  tar xzf${__MVNW_QUIET_TAR:+"$__MVNW_QUIET_TAR"} "$TMP_DOWNLOAD_DIR/$distributionUrlName" -C "$TMP_DOWNLOAD_DIR" || die "failed to untar"
+fi
+printf %s\\n "$distributionUrl" >"$TMP_DOWNLOAD_DIR/$distributionUrlNameMain/mvnw.url"
+mv -- "$TMP_DOWNLOAD_DIR/$distributionUrlNameMain" "$MAVEN_HOME" || [ -d "$MAVEN_HOME" ] || die "fail to move MAVEN_HOME"
+
+clean || :
+exec_maven "$@"

mvnw.cmd

+<# : batch portion
+@REM ----------------------------------------------------------------------------
+@REM Licensed to the Apache Software Foundation (ASF) under one
+@REM or more contributor license agreements.  See the NOTICE file
+@REM distributed with this work for additional information
+@REM regarding copyright ownership.  The ASF licenses this file
+@REM to you under the Apache License, Version 2.0 (the
+@REM "License"); you may not use this file except in compliance
+@REM with the License.  You may obtain a copy of the License at
+@REM
+@REM    http://www.apache.org/licenses/LICENSE-2.0
+@REM
+@REM Unless required by applicable law or agreed to in writing,
+@REM software distributed under the License is distributed on an
+@REM "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+@REM KIND, either express or implied.  See the License for the
+@REM specific language governing permissions and limitations
+@REM under the License.
+@REM ----------------------------------------------------------------------------
+
+@REM ----------------------------------------------------------------------------
+@REM Apache Maven Wrapper startup batch script, version 3.3.2
+@REM
+@REM Optional ENV vars
+@REM   MVNW_REPOURL - repo url base for downloading maven distribution
+@REM   MVNW_USERNAME/MVNW_PASSWORD - user and password for downloading maven
+@REM   MVNW_VERBOSE - true: enable verbose log; others: silence the output
+@REM ----------------------------------------------------------------------------
+
+@IF "%__MVNW_ARG0_NAME__%"=="" (SET __MVNW_ARG0_NAME__=%~nx0)
+@SET __MVNW_CMD__=
+@SET __MVNW_ERROR__=
+@SET __MVNW_PSMODULEP_SAVE=%PSModulePath%
+@SET PSModulePath=
+@FOR /F "usebackq tokens=1* delims==" %%A IN (`powershell -noprofile "& {$scriptDir='%~dp0'; $script='%__MVNW_ARG0_NAME__%'; icm -ScriptBlock ([Scriptblock]::Create((Get-Content -Raw '%~f0'))) -NoNewScope}"`) DO @(
+  IF "%%A"=="MVN_CMD" (set __MVNW_CMD__=%%B) ELSE IF "%%B"=="" (echo %%A) ELSE (echo %%A=%%B)
+)
+@SET PSModulePath=%__MVNW_PSMODULEP_SAVE%
+@SET __MVNW_PSMODULEP_SAVE=
+@SET __MVNW_ARG0_NAME__=
+@SET MVNW_USERNAME=
+@SET MVNW_PASSWORD=
+@IF NOT "%__MVNW_CMD__%"=="" (%__MVNW_CMD__% %*)
+@echo Cannot start maven from wrapper >&2 && exit /b 1
+@GOTO :EOF
+: end batch / begin powershell #>
+
+$ErrorActionPreference = "Stop"
+if ($env:MVNW_VERBOSE -eq "true") {
+  $VerbosePreference = "Continue"
+}
+
+# calculate distributionUrl, requires .mvn/wrapper/maven-wrapper.properties
+$distributionUrl = (Get-Content -Raw "$scriptDir/.mvn/wrapper/maven-wrapper.properties" | ConvertFrom-StringData).distributionUrl
+if (!$distributionUrl) {
+  Write-Error "cannot read distributionUrl property in $scriptDir/.mvn/wrapper/maven-wrapper.properties"
+}
+
+switch -wildcard -casesensitive ( $($distributionUrl -replace '^.*/','') ) {
+  "maven-mvnd-*" {
+    $USE_MVND = $true
+    $distributionUrl = $distributionUrl -replace '-bin\.[^.]*$',"-windows-amd64.zip"
+    $MVN_CMD = "mvnd.cmd"
+    break
+  }
+  default {
+    $USE_MVND = $false
+    $MVN_CMD = $script -replace '^mvnw','mvn'
+    break
+  }
+}
+
+# apply MVNW_REPOURL and calculate MAVEN_HOME
+# maven home pattern: ~/.m2/wrapper/dists/{apache-maven-<version>,maven-mvnd-<version>-<platform>}/<hash>
+if ($env:MVNW_REPOURL) {
+  $MVNW_REPO_PATTERN = if ($USE_MVND) { "/org/apache/maven/" } else { "/maven/mvnd/" }
+  $distributionUrl = "$env:MVNW_REPOURL$MVNW_REPO_PATTERN$($distributionUrl -replace '^.*'+$MVNW_REPO_PATTERN,'')"
+}
+$distributionUrlName = $distributionUrl -replace '^.*/',''
+$distributionUrlNameMain = $distributionUrlName -replace '\.[^.]*$','' -replace '-bin$',''
+$MAVEN_HOME_PARENT = "$HOME/.m2/wrapper/dists/$distributionUrlNameMain"
+if ($env:MAVEN_USER_HOME) {
+  $MAVEN_HOME_PARENT = "$env:MAVEN_USER_HOME/wrapper/dists/$distributionUrlNameMain"
+}
+$MAVEN_HOME_NAME = ([System.Security.Cryptography.MD5]::Create().ComputeHash([byte[]][char[]]$distributionUrl) | ForEach-Object {$_.ToString("x2")}) -join ''
+$MAVEN_HOME = "$MAVEN_HOME_PARENT/$MAVEN_HOME_NAME"
+
+if (Test-Path -Path "$MAVEN_HOME" -PathType Container) {
+  Write-Verbose "found existing MAVEN_HOME at $MAVEN_HOME"
+  Write-Output "MVN_CMD=$MAVEN_HOME/bin/$MVN_CMD"
+  exit $?
+}
+
+if (! $distributionUrlNameMain -or ($distributionUrlName -eq $distributionUrlNameMain)) {
+  Write-Error "distributionUrl is not valid, must end with *-bin.zip, but found $distributionUrl"
+}
+
+# prepare tmp dir
+$TMP_DOWNLOAD_DIR_HOLDER = New-TemporaryFile
+$TMP_DOWNLOAD_DIR = New-Item -Itemtype Directory -Path "$TMP_DOWNLOAD_DIR_HOLDER.dir"
+$TMP_DOWNLOAD_DIR_HOLDER.Delete() | Out-Null
+trap {
+  if ($TMP_DOWNLOAD_DIR.Exists) {
+    try { Remove-Item $TMP_DOWNLOAD_DIR -Recurse -Force | Out-Null }
+    catch { Write-Warning "Cannot remove $TMP_DOWNLOAD_DIR" }
+  }
+}
+
+New-Item -Itemtype Directory -Path "$MAVEN_HOME_PARENT" -Force | Out-Null
+
+# Download and Install Apache Maven
+Write-Verbose "Couldn't find MAVEN_HOME, downloading and installing it ..."
+Write-Verbose "Downloading from: $distributionUrl"
+Write-Verbose "Downloading to: $TMP_DOWNLOAD_DIR/$distributionUrlName"
+
+$webclient = New-Object System.Net.WebClient
+if ($env:MVNW_USERNAME -and $env:MVNW_PASSWORD) {
+  $webclient.Credentials = New-Object System.Net.NetworkCredential($env:MVNW_USERNAME, $env:MVNW_PASSWORD)
+}
+[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
+$webclient.DownloadFile($distributionUrl, "$TMP_DOWNLOAD_DIR/$distributionUrlName") | Out-Null
+
+# If specified, validate the SHA-256 sum of the Maven distribution zip file
+$distributionSha256Sum = (Get-Content -Raw "$scriptDir/.mvn/wrapper/maven-wrapper.properties" | ConvertFrom-StringData).distributionSha256Sum
+if ($distributionSha256Sum) {
+  if ($USE_MVND) {
+    Write-Error "Checksum validation is not supported for maven-mvnd. `nPlease disable validation by removing 'distributionSha256Sum' from your maven-wrapper.properties."
+  }
+  Import-Module $PSHOME\Modules\Microsoft.PowerShell.Utility -Function Get-FileHash
+  if ((Get-FileHash "$TMP_DOWNLOAD_DIR/$distributionUrlName" -Algorithm SHA256).Hash.ToLower() -ne $distributionSha256Sum) {
+    Write-Error "Error: Failed to validate Maven distribution SHA-256, your Maven distribution might be compromised. If you updated your Maven version, you need to update the specified distributionSha256Sum property."
+  }
+}
+
+# unzip and move
+Expand-Archive "$TMP_DOWNLOAD_DIR/$distributionUrlName" -DestinationPath "$TMP_DOWNLOAD_DIR" | Out-Null
+Rename-Item -Path "$TMP_DOWNLOAD_DIR/$distributionUrlNameMain" -NewName $MAVEN_HOME_NAME | Out-Null
+try {
+  Move-Item -Path "$TMP_DOWNLOAD_DIR/$MAVEN_HOME_NAME" -Destination $MAVEN_HOME_PARENT | Out-Null
+} catch {
+  if (! (Test-Path -Path "$MAVEN_HOME" -PathType Container)) {
+    Write-Error "fail to move MAVEN_HOME"
+  }
+} finally {
+  try { Remove-Item $TMP_DOWNLOAD_DIR -Recurse -Force | Out-Null }
+  catch { Write-Warning "Cannot remove $TMP_DOWNLOAD_DIR" }
+}
+
+Write-Output "MVN_CMD=$MAVEN_HOME/bin/$MVN_CMD"

pom.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<parent>
+		<groupId>org.springframework.boot</groupId>
+		<artifactId>spring-boot-starter-parent</artifactId>
+		<version>3.4.0</version>
+		<relativePath/> <!-- lookup parent from repository -->
+	</parent>
+	<groupId>com.nisum</groupId>
+	<artifactId>BookInfo</artifactId>
+	<version>0.0.1-SNAPSHOT</version>
+	<name>BookInfo</name>
+	<description>Demo project for Spring Boot</description>
+	<url/>
+	<licenses>
+		<license/>
+	</licenses>
+	<developers>
+		<developer/>
+	</developers>
+	<scm>
+		<connection/>
+		<developerConnection/>
+		<tag/>
+		<url/>
+	</scm>
+	<properties>
+		<java.version>17</java.version>
+	</properties>
+	<dependencies>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-data-r2dbc</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-webflux</artifactId>
+		</dependency>
+
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-test</artifactId>
+			<scope>test</scope>
+		</dependency>
+		<dependency>
+			<groupId>io.projectreactor</groupId>
+			<artifactId>reactor-test</artifactId>
+			<scope>test</scope>
+		</dependency>
+
+		<dependency>
+			<groupId>com.mysql</groupId>
+			<artifactId>mysql-connector-j</artifactId>
+			<scope>runtime</scope>
+		</dependency>
+		<dependency>
+			<groupId>io.asyncer</groupId>
+			<artifactId>r2dbc-mysql</artifactId>
+			<scope>runtime</scope>
+		</dependency>
+
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-jdbc</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>com.zaxxer</groupId>
+			<artifactId>HikariCP</artifactId>
+			<scope>compile</scope>
+		</dependency>
+
+		<!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->
+		<!--<dependency>
+			<groupId>org.projectlombok</groupId>
+			<artifactId>lombok</artifactId>
+			&lt;!&ndash;<version>1.18.24</version>
+			<scope>provided</scope>&ndash;&gt;
+		</dependency>-->
+
+		<!-- https://mvnrepository.com/artifact/org.mapstruct/mapstruct -->
+		<!--<dependency>
+			<groupId>org.mapstruct</groupId>
+			<artifactId>mapstruct</artifactId>
+			<version>1.5.3.Final</version>
+		</dependency>-->
+		<!--<dependency>
+			<groupId>org.mapstruct</groupId>
+			<artifactId>mapstruct-processor</artifactId>
+			<version>1.5.3.Final</version>
+			<scope>provided</scope>
+		</dependency>
+
+		<dependency>
+			<groupId>org.modelmapper</groupId>
+			<artifactId>modelmapper</artifactId>
+			<version>2.4.0</version> &lt;!&ndash; Use the latest version available &ndash;&gt;
+		</dependency>-->
+
+		<!--<dependency>
+			<groupId>org.mockito</groupId>
+			<artifactId>mockito-core</artifactId>
+			<version>4.6.1</version>
+			<scope>test</scope>
+		</dependency>
+		<dependency>
+			<groupId>org.junit.jupiter</groupId>
+			<artifactId>junit-jupiter-api</artifactId>
+			<version>5.7.0</version>
+			<scope>test</scope>
+		</dependency>-->
+
+
+	</dependencies>
+
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.springframework.boot</groupId>
+				<artifactId>spring-boot-maven-plugin</artifactId>
+			</plugin>
+
+
+			<!--<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-compiler-plugin</artifactId>
+				<version>3.8.1</version>
+				<configuration>
+					<source>17</source>
+					<target>17</target>
+					<annotationProcessorPaths>
+
+						&lt;!&ndash;<annotationProcessorPath>
+							<groupId>org.mapstruct</groupId>
+							<artifactId>mapstruct-processor</artifactId>
+							<version>1.5.3.Final</version>
+						</annotationProcessorPath>&ndash;&gt;
+
+
+
+					</annotationProcessorPaths>
+				</configuration>
+			</plugin>-->
+			<!--<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-surefire-plugin</artifactId>
+				<version>3.5.2</version>
+				<configuration>
+					<includes>
+						<include>**/*Test.java</include> &lt;!&ndash; Customize test includes &ndash;&gt;
+					</includes>
+					<forkCount>1</forkCount> &lt;!&ndash; Control the number of forks used &ndash;&gt;
+					<reuseForks>false</reuseForks> &lt;!&ndash; Whether to reuse JVM fork &ndash;&gt;
+				</configuration>
+			</plugin>-->
+		</plugins>
+	</build>
+
+</project>

src/main/java/com/nisum/BookInfo/BookInfoApplication.java

+package com.nisum.BookInfo;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class BookInfoApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(BookInfoApplication.class, args);
+	}
+
+}

src/main/java/com/nisum/BookInfo/config/DataSourceConfiguration.java

+package com.nisum.BookInfo.config;
+
+import com.zaxxer.hikari.HikariConfig;
+import com.zaxxer.hikari.HikariDataSource;
+import io.r2dbc.spi.ConnectionFactories;
+import io.r2dbc.spi.ConnectionFactory;
+import io.r2dbc.spi.ConnectionFactoryOptions;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.jdbc.datasource.DataSourceTransactionManager;
+import org.springframework.r2dbc.core.DatabaseClient;
+
+import javax.sql.DataSource;
+
+import static io.r2dbc.spi.ConnectionFactoryOptions.*;
+
+@Configuration
+public class DataSourceConfiguration {
+
+
+    private final Logger log = LoggerFactory.getLogger(DataSourceConfiguration.class);
+    public static final String POOL = "pool";
+    public static final String MYSQL = "mysql";
+
+
+    @Bean
+    public DataSource createDataSource(DataSourceProperties dataSourceProperties) {
+
+        HikariConfig hikariConfig = new HikariConfig();
+        hikariConfig.setDriverClassName("com.mysql.cj.jdbc.Driver");
+        hikariConfig.setJdbcUrl("jdbc:mysql://localhost:3306/test1");
+        hikariConfig.setUsername("root");
+        hikariConfig.setPassword("root");
+
+
+        return new HikariDataSource(hikariConfig);
+    }
+
+    @Bean
+    public DataSourceTransactionManager createTransactionManager(DataSource dataSource) {
+
+        return new DataSourceTransactionManager(dataSource);
+    }
+
+    @Bean
+    public ConnectionFactory createConnectionFactory(DataSourceProperties dataSourceProperties) {
+
+        return ConnectionFactories.get(ConnectionFactoryOptions.builder()
+                .option(DRIVER, POOL)
+                .option(PROTOCOL, MYSQL)
+                .option(HOST, dataSourceProperties.getHostName())
+                .option(PORT, dataSourceProperties.getPort())
+                .option(USER, dataSourceProperties.getUserName())
+                .option(PASSWORD, dataSourceProperties.getPassword())
+                .option(DATABASE, dataSourceProperties.getDatabaseName())
+                .build());
+    }
+
+    public DatabaseClient createDataBaseClient(ConnectionFactory connectionFactory) {
+
+        return DatabaseClient.create(connectionFactory);
+
+    }
+}

src/main/java/com/nisum/BookInfo/config/DataSourceProperties.java

+package com.nisum.BookInfo.config;
+
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.stereotype.Component;
+
+@Component
+@ConfigurationProperties("spring.r2dbc")
+
+
+public class DataSourceProperties {
+
+    private String driverClassName;
+
+    private String hostName;
+
+    private Integer port;
+
+    private String databaseName;
+
+    private String url;
+
+    private String userName;
+
+    private String password;
+
+
+    public String getDriverClassName() {
+        return driverClassName;
+    }
+
+    public void setDriverClassName(String driverClassName) {
+        this.driverClassName = driverClassName;
+    }
+
+    public String getHostName() {
+        return hostName;
+    }
+
+    public void setHostName(String hostName) {
+        this.hostName = hostName;
+    }
+
+    public Integer getPort() {
+        return port;
+    }
+
+    public void setPort(Integer port) {
+        this.port = port;
+    }
+
+    public String getDatabaseName() {
+        return databaseName;
+    }
+
+    public void setDatabaseName(String databaseName) {
+        this.databaseName = databaseName;
+    }
+
+    public String getUrl() {
+        return url;
+    }
+
+    public void setUrl(String url) {
+        this.url = url;
+    }
+
+    public String getUserName() {
+        return userName;
+    }
+
+    public void setUserName(String userName) {
+        this.userName = userName;
+    }
+
+    public String getPassword() {
+        return password;
+    }
+
+    public void setPassword(String password) {
+        this.password = password;
+    }
+
+    @Override
+    public String toString() {
+        return "DataSourceProperties{" +
+                "driverClassName='" + driverClassName + '\'' +
+                ", hostName='" + hostName + '\'' +
+                ", port=" + port +
+                ", databaseName='" + databaseName + '\'' +
+                ", url='" + url + '\'' +
+                ", userName='" + userName + '\'' +
+                ", password='" + password + '\'' +
+                '}';
+    }
+
+}

src/main/java/com/nisum/BookInfo/controller/BookController.java

+package com.nisum.BookInfo.controller;
+import com.nisum.BookInfo.dto.BookDto;
+import com.nisum.BookInfo.entity.Book;
+import com.nisum.BookInfo.service.BookService;
+import com.nisum.BookInfo.validator.CommonServiceValidator;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+import reactor.core.publisher.Flux;
+import reactor.core.publisher.Mono;
+
+
+
+@RestController
+@RequestMapping("/books")
+
+public class BookController {
+
+    private static final Logger logger = LoggerFactory.getLogger(BookController.class);
+
+
+    @Autowired
+    public BookService bookService;
+    @Autowired
+    public CommonServiceValidator validator;
+
+   /* @Autowired
+    private ModelMapper modelMapper;
+
+
+   @PostMapping("/createBook")
+    public  Mono<Book> create(@RequestBody Book book){
+       logger.info("CreateBook method called");
+      return  bookService.create(book);
+
+
+    }
+
+   @GetMapping("/getAllBook")
+    public Flux<Book> getAllBook(){
+       logger.info("getAllBook method called");
+       return bookService.getAllBooks();
+    }
+
+    @GetMapping("/getSingleBook/{bookId}")
+    public Mono<Book> getSingleBook(@PathVariable Integer bookId){
+        logger.info("getSingleBook method called");
+       return  bookService.getBook(bookId);
+    }
+
+   @PutMapping("/updateBook/{bookId}")
+    public Mono<Book> update(@RequestBody Book book,@PathVariable Integer bookId){
+       logger.info("update method called");
+       return bookService.updateBook(book,bookId);
+    }
+
+    @DeleteMapping("/deleteBook/{bookId}")
+    public Mono<Void> delete(@PathVariable Integer bookId){
+        logger.info("delete method called");
+        return   bookService.deleteBook(bookId);
+    }
+
+*/
+
+
+    // Create a new book
+    @PostMapping("/createBook")
+    public Mono<?> createBook(@RequestBody Mono<BookDto> bookDto) {
+       /* return bookService.saveBook(bookDto)
+                .map(rows -> "Book created successfully!");*/
+
+        return bookDto.doOnNext(bookbookDto -> logger.info("validating incoming Book data: {}", bookDto))
+                .flatMap(bookDto1 -> {
+
+                    return validateBook(bookDto1)
+                            .then(bookService.saveBook(bookDto1));
+                })
+                .map(ResponseEntity::ok)
+                .doOnError(error -> logger.error("Error while adding Book: {}", error.getMessage()));
+    }
+
+
+    // Get all books
+    @GetMapping("/getAllBook")
+    public Flux<Book> getAllBooks() {
+        //return bookService.getAllBooks();
+        return bookService.getAllBooks()
+                .doOnNext(employee -> logger.info("Processing Book data: {}", employee))
+                .doOnError(error -> logger.error("Error fetching Book: {}", error.getMessage()));
+
+    }
+
+    // Get a book by IDBookService
+    @GetMapping("/getBookById/{id}")
+    public Mono<?> getBookById(@PathVariable Integer id) {
+       // return bookService.getBookById(id);
+
+        return validator.isBookIdValid(id)
+                .flatMap(valid -> bookService.getBookById(id))
+                .map(ResponseEntity::ok)
+                .doOnError(error -> logger.error("Error fetching Book by ID: {}", error.getMessage()));
+
+    }
+
+    // Update a book by ID
+    @PutMapping("/updateBook/{id}")
+    public Mono<?> updateBook(@PathVariable Integer id, @RequestBody Mono<BookDto> bookDto) {
+       /* return bookService.updateBook(id, bookDto)
+                .map(rows -> "Book updated successfully!");*/
+
+        return validator.isBookIdValid(id)
+                .flatMap(valid -> bookDto
+                        .flatMap(dto -> {
+
+                            return validateBook(dto)
+                                    .then(bookService.updateBook(id, dto));
+                        })
+                )
+                .map(ResponseEntity::ok)
+                .doOnError(error -> logger.error("Error updating Book: {}", error.getMessage()));
+    }
+
+    // Delete a book by ID
+    @DeleteMapping("/deleteBookById/{id}")
+    public Mono<?> deleteBook(@PathVariable Integer id) {
+      /*  return bookService.deleteBook(id)
+                .map(rows -> "Book deleted successfully!");*/
+
+        return validator.isBookIdValid(id)
+                .flatMap(valid -> bookService.deleteBook(id))
+                .thenReturn(ResponseEntity.ok().build())
+                .doOnError(error -> logger.error("Error deleting Book: {}", error.getMessage()));
+    }
+
+
+
+    private Mono<Void> validateBook(BookDto bookDto) {
+
+        return validator.isBookIdValid(bookDto.getBookId())
+                .then(validator.isBookNameValid(bookDto.getName()))
+                .then();
+    }
+
+}
+
+

src/main/java/com/nisum/BookInfo/dao/BookDao.java

+package com.nisum.BookInfo.dao;
+
+
+import com.nisum.BookInfo.entity.Book;
+import com.nisum.BookInfo.exception.BookNotFoundException;
+import com.nisum.BookInfo.util.AppErrorCode;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.dao.DataAccessException;
+import org.springframework.r2dbc.core.DatabaseClient;
+import org.springframework.stereotype.Repository;
+import reactor.core.publisher.Flux;
+import reactor.core.publisher.Mono;
+
+@Repository
+public class BookDao {
+    @Autowired
+    private DatabaseClient databaseClient;
+
+
+
+
+    public Mono<Book> saveBook(Book book) {
+        return databaseClient
+                .sql("INSERT INTO book_details (book_id, book_name,book_desc,book_publiser,book_author) VALUES (:bookId, :name,:desc,:publiser,:author)")
+                .bind("bookId", book.getBookId())
+                .bind("name", book.getName())
+                .bind("desc", book.getDesc())
+                .bind("publiser", book.getPubliser())
+                .bind("author", book.getAuthor())
+                .fetch()
+                .rowsUpdated().flatMap(rows ->
+                {
+                    if (rows > 0) {
+                        return Mono.just(book);  //Returning the saved employee
+                    } else {
+                        return Mono.error(new BookNotFoundException(AppErrorCode.BOOK_NOT_FOUND,"Data Invalid") {
+                        });
+
+                    }
+                });
+    }
+
+
+    public Flux<Book> getAllBooks() {
+        return databaseClient
+                .sql("SELECT book_id, book_name, book_desc, book_publiser,book_author FROM book_details")
+                .map((row, metadata) -> new Book(
+                        row.get("book_id", Integer.class),
+                        row.get("book_name", String.class),
+                        row.get("book_desc", String.class),
+                        row.get("book_publiser", String.class),
+                        row.get("book_author", String.class)
+                ))
+                .all();      // Returns Flux<Book> for all books
+    }
+
+    public Mono<Book> getBookById(Integer id) {
+        return databaseClient
+                .sql("SELECT book_id, book_name, book_desc, book_publiser,book_author FROM book_details WHERE book_id = :book_id")
+                .bind("book_id", id)
+                .map((row, metadata) -> new Book(
+                        row.get("book_id", Integer.class),
+                        row.get("book_name", String.class),
+                        row.get("book_desc", String.class),
+                        row.get("book_publiser", String.class),
+                        row.get("book_author", String.class)
+
+                ))
+                .one(); // Returns Mono<Book> for a single book or empty if not found
+    }
+
+    // Update a book
+    public Mono<Book> updateBook(Integer bookId, Book book) {
+        return databaseClient
+                .sql("UPDATE book_details SET  book_author = :author, book_name = :name WHERE book_id = :id")
+                .bind("id", bookId)
+                .bind("name", book.getAuthor())
+                //.bind("desc", book.getDesc())
+                //.bind("publiser", book.getPubliser())
+                .bind("author", book.getAuthor())
+
+                .fetch()
+                .rowsUpdated().
+                flatMap(rows ->
+                {
+                    if (rows > 0) {
+                        return Mono.just(book);  //Returning the saved employee
+                    } else {
+                        return Mono.error(new BookNotFoundException(AppErrorCode.BOOK_UPDATE_FAILED,"UPDATE OF BOOK NOT POSSIBLE") {
+                                          }
+                        );
+                    }
+
+
+                });
+    }
+
+    public Mono<Void> deleteBook(Integer id) {
+        return databaseClient.sql("DELETE FROM book_details WHERE book_id = :id")
+                .bind("id", id)
+                .fetch()
+                .rowsUpdated().
+                flatMap(rows ->
+                {
+
+                    if (rows > 0) {
+                        return Mono.empty();
+
+
+                    } else {
+                        return Mono.error(new BookNotFoundException(AppErrorCode.BOOK_DELETION_FAILED,"Invalid Book data") {
+                                          }
+                        );
+                    }
+
+
+                });
+    }
+
+}

src/main/java/com/nisum/BookInfo/dto/BookDto.java

+package com.nisum.BookInfo.dto;
+
+
+import org.springframework.data.relational.core.mapping.Column;
+/*@Data
+@Getter*/
+public class BookDto {
+    private Integer bookId;
+    private String name;
+    private String desc;
+    private String publiser;
+    private String author;
+
+   public BookDto(Integer bookId, String name, String desc, String publiser, String author) {
+        this.bookId = bookId;
+        this.name = name;
+        this.desc = desc;
+        this.publiser = publiser;
+        this.author = author;
+    }
+
+    public BookDto() {
+    }
+
+    public Integer getBookId() {
+        return bookId;
+    }
+
+    public void setBookId(Integer bookId) {
+        this.bookId = bookId;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getDesc() {
+        return desc;
+    }
+
+    public void setDesc(String desc) {
+        this.desc = desc;
+    }
+
+    public String getPubliser() {
+        return publiser;
+    }
+
+    public void setPubliser(String publiser) {
+        this.publiser = publiser;
+    }
+
+    public String getAuthor() {
+        return author;
+    }
+
+    public void setAuthor(String author) {
+        this.author = author;
+    }
+}

src/main/java/com/nisum/BookInfo/dto/ErrorResponseDto.java

+package com.nisum.BookInfo.dto;
+
+
+//@Data
+/*@Builder
+@Getter*/
+public class ErrorResponseDto {
+    private String errorCode;
+    private String errorMessage;
+
+    public ErrorResponseDto(String errorCode, String errorMessage) {
+        this.errorCode = errorCode;
+        this.errorMessage = errorMessage;
+    }
+
+    public ErrorResponseDto() {
+    }
+
+    public String getErrorCode() {
+        return errorCode;
+    }
+
+    public void setErrorCode(String errorCode) {
+        this.errorCode = errorCode;
+    }
+
+    public String getErrorMessage() {
+        return errorMessage;
+    }
+
+    public void setErrorMessage(String errorMessage) {
+        this.errorMessage = errorMessage;
+    }
+}

src/main/java/com/nisum/BookInfo/entity/Book.java

+package com.nisum.BookInfo.entity;
+
+
+import org.springframework.data.annotation.Id;
+import org.springframework.data.relational.core.mapping.Column;
+import org.springframework.data.relational.core.mapping.Table;
+/*@Data
+@AllArgsConstructor
+@NoArgsConstructor*/
+
+@Table("book_details")
+    public class Book {
+    @Id
+    @Column("book_id")
+    private Integer bookId;
+
+    @Column("book_name")
+    private String name;
+
+    @Column("book_desc")
+    private String desc;
+
+    @Column("book_publiser")
+    private String publiser;
+
+    @Column("book_author")
+    private String author;
+
+    public Book(Integer bookId, String name, String desc, String publiser, String author) {
+        this.bookId = bookId;
+        this.name = name;
+        this.desc = desc;
+        this.publiser = publiser;
+        this.author = author;
+    }
+
+    public Book() {
+    }
+
+    public Integer getBookId() {
+        return bookId;
+    }
+
+    public void setBookId(Integer bookId) {
+        this.bookId = bookId;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getDesc() {
+        return desc;
+    }
+
+    public void setDesc(String desc) {
+        this.desc = desc;
+    }
+
+    public String getPubliser() {
+        return publiser;
+    }
+
+    public void setPubliser(String publiser) {
+        this.publiser = publiser;
+    }
+
+    public String getAuthor() {
+        return author;
+    }
+
+    public void setAuthor(String author) {
+        this.author = author;
+    }
+}
+
+
+

src/main/java/com/nisum/BookInfo/exception/BookNotFoundException.java

+package com.nisum.BookInfo.exception;
+
+
+import com.nisum.BookInfo.util.AppErrorCode;
+
+public class BookNotFoundException extends RuntimeException{
+
+    private AppErrorCode errorCode;
+
+    public BookNotFoundException() {
+
+    }
+
+    public BookNotFoundException(AppErrorCode errorCode,String message) {
+        super(message);
+        this.errorCode=errorCode;
+    }
+
+    public AppErrorCode getErrorCode() {
+        return errorCode;
+    }
+}

src/main/java/com/nisum/BookInfo/exception/BookValidationException.java

+package com.nisum.BookInfo.exception;
+
+import com.nisum.BookInfo.util.AppErrorCode;
+
+public class BookValidationException extends RuntimeException{
+    private  AppErrorCode errorCode;
+
+    public BookValidationException() {
+
+    }
+
+    public BookValidationException(AppErrorCode errorCode,String message) {
+        super(message);
+        this.errorCode=errorCode;
+    }
+
+    public AppErrorCode getErrorCode() {
+        return errorCode;
+    }
+
+   /* private final AppErrorCode errorCode;
+
+    public BookValidationException(AppErrorCode errorCode, String message) {
+        super(message);
+        this.errorCode = errorCode;
+    }
+
+    public AppErrorCode getErrorCode() {
+        return errorCode;
+    }
+*/
+
+}

src/main/java/com/nisum/BookInfo/globalexception/BookAdviceController.java

+package com.nisum.BookInfo.globalexception;
+
+import com.nisum.BookInfo.dto.ErrorResponseDto;
+import com.nisum.BookInfo.exception.BookNotFoundException;
+import com.nisum.BookInfo.exception.BookValidationException;
+import org.springframework.http.HttpStatus;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.RestControllerAdvice;
+
+@RestControllerAdvice
+public class BookAdviceController {
+
+
+    @ExceptionHandler(BookNotFoundException.class)
+    public ErrorResponseDto handleBookNotFoundException(BookNotFoundException bookNotFoundException){
+
+    /*return ErrorResponseDto.builder().errorCode(String.valueOf(HttpStatus.NOT_FOUND))
+            .errorMessage(bookNotFoundException.getMessage()).build();*/
+       /* return ErrorResponseDto.builder().errorCode(bookNotFoundException.getErrorCode().getString())
+                .errorMessage(bookNotFoundException.getMessage()) .build();*/
+        ErrorResponseDto errorResponseDto=new ErrorResponseDto();
+        errorResponseDto.setErrorCode(bookNotFoundException.getErrorCode().getString());
+        errorResponseDto.setErrorMessage(bookNotFoundException.getMessage());
+        return  errorResponseDto;
+
+    }
+@ExceptionHandler(BookValidationException.class)
+    public  ErrorResponseDto handleBookValidationException(BookValidationException bookValidationException){
+
+       /* return ErrorResponseDto.builder().errorCode(bookValidationException.getErrorCode().getString())
+                .errorMessage(bookValidationException.getMessage()).build();*/
+    ErrorResponseDto errorResponseDto=new ErrorResponseDto();
+    errorResponseDto.setErrorCode(bookValidationException.getErrorCode().getString());
+    errorResponseDto.setErrorMessage(bookValidationException.getMessage());
+    return  errorResponseDto;
+    }
+}

src/main/java/com/nisum/BookInfo/mapper/BookMapper.java

+package com.nisum.BookInfo.mapper;
+
+import com.nisum.BookInfo.dto.BookDto;
+import com.nisum.BookInfo.entity.Book;
+import org.springframework.beans.factory.annotation.Autowired;
+
+public class BookMapper {
+
+    @Autowired
+    private BookDto bookDto;
+
+    public static Book toEntity(BookDto dto) {
+        Book book = new Book();
+        book.setBookId(dto.getBookId());
+        book.setName(dto.getName());
+        book.setAuthor(dto.getAuthor());
+        book.setDesc(dto.getDesc());
+        book.setPubliser(dto.getPubliser());
+
+        return book;
+    }
+
+    public static BookDto toDto(Book book) {
+        BookDto dto = new BookDto();
+        dto.setBookId(book.getBookId());
+        dto.setName(book.getName());
+        dto.setAuthor(book.getAuthor());
+        dto.setDesc(book.getDesc());
+        dto.setPubliser(book.getPubliser());
+
+
+        return dto;
+    }
+}

src/main/java/com/nisum/BookInfo/repository/BookRepo.java

+package com.nisum.BookInfo.repository;
+
+import com.nisum.BookInfo.entity.Book;
+import org.springframework.data.repository.reactive.ReactiveCrudRepository;
+import org.springframework.stereotype.Repository;
+
+/*@Repository
+public interface BookRepo extends ReactiveCrudRepository <Book,Integer>{
+
+}*/

src/main/java/com/nisum/BookInfo/service/BookService.java

+package com.nisum.BookInfo.service;
+
+import com.nisum.BookInfo.dto.BookDto;
+import com.nisum.BookInfo.entity.Book;
+import org.springframework.web.bind.annotation.PathVariable;
+import reactor.core.publisher.Flux;
+import reactor.core.publisher.Mono;
+
+public interface BookService {
+
+  /*  public Mono<Book> create(Book book);
+
+    public Flux<Book> getAllBooks();
+
+    public Mono<Book> getBook(Integer bookId);
+
+    public Mono<Book> updateBook(Book book,Integer bookId);
+
+    public Mono<Void> deleteBook(Integer bookId);
+*/
+
+    Mono<Book> saveBook(BookDto bookDto) ;
+    // Get all books
+    public Flux<Book> getAllBooks();
+
+    // Get a book by ID
+    public Mono<Book> getBookById(Integer id) ;
+
+    // Update a book
+    public Mono<Book> updateBook(Integer id, BookDto bookDto);
+
+    public Mono<Void> deleteBook(@PathVariable Integer id) ;
+
+    }

src/main/java/com/nisum/BookInfo/service/BookServiceImpl.java

+package com.nisum.BookInfo.service;
+
+import com.nisum.BookInfo.dao.BookDao;
+import com.nisum.BookInfo.dto.BookDto;
+import com.nisum.BookInfo.entity.Book;
+import com.nisum.BookInfo.mapper.BookMapper;
+
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.dao.DataAccessException;
+import org.springframework.r2dbc.core.DatabaseClient;
+import org.springframework.stereotype.Service;
+import reactor.core.publisher.Flux;
+import reactor.core.publisher.Mono;
+@Service
+public class BookServiceImpl implements BookService{
+   // @Autowired
+   // private BookRepo bookRepo;
+    @Autowired
+    private BookDao bookDao;
+  /* @Autowired
+    private ModelMapper modelMapper;*/
+
+
+   //saveBook
+    public Mono<Book> saveBook(BookDto bookDto) {
+
+       // Book book=  modelMapper.map(bookDto,Book.class); //mapper for BookDto to book
+      Book book=  BookMapper.toEntity(bookDto);
+        return   bookDao.saveBook(book);
+
+    }
+
+    // Get all books
+    public Flux<Book> getAllBooks() {
+        return bookDao.getAllBooks();
+    }
+
+    // Get a book by ID
+    public Mono<Book> getBookById(Integer id) {
+        return bookDao.getBookById(id);
+    }
+
+
+    // Update a book
+    public Mono<Book> updateBook(Integer bookId, BookDto bookDto) {
+       // Book book=  modelMapper.map(bookDto,Book.class); //mapper for BookDto to book
+        Book book=  BookMapper.toEntity(bookDto);
+        return   bookDao.updateBook(bookId,book);
+
+
+    }
+
+    public Mono<Void> deleteBook(Integer id) {
+        return bookDao.deleteBook(id);
+    }
+}

src/main/java/com/nisum/BookInfo/util/AppErrorCode.java

+package com.nisum.BookInfo.util;
+
+import com.fasterxml.jackson.annotation.JsonValue;
+
+public enum AppErrorCode {
+    BOOK_NOT_FOUND("BOOK_404"),
+    INVALID_BOOK_DATA("BOOK_400"),
+    BOOK_CREATION_FAILED("BOOK_500"),
+    BOOK_UPDATE_FAILED("BOOK_500"),
+    BOOK_DELETION_FAILED("BOOK_500"),
+    GENERAL_ERROR("BOOK_500");
+
+
+    private final String errorCode;
+
+
+    // Constructor
+    private AppErrorCode(String errorCode) {
+        this.errorCode = errorCode;
+    }
+
+    // Method to return the error code as a string
+    @JsonValue
+    public String getString() {
+        return this.errorCode;
+    }
+}

src/main/java/com/nisum/BookInfo/validator/CommonServiceValidator.java

+package com.nisum.BookInfo.validator;
+
+import com.nisum.BookInfo.entity.Book;
+import com.nisum.BookInfo.exception.BookNotFoundException;
+import com.nisum.BookInfo.exception.BookValidationException;
+import com.nisum.BookInfo.util.AppErrorCode;
+import org.springframework.stereotype.Component;
+import reactor.core.publisher.Mono;
+@Component
+public class CommonServiceValidator {
+
+
+
+//bookId is invalid
+    public Mono<Boolean> isBookIdValid(Integer id) {
+        if (id != null) {
+            return Mono.just(true);
+        }
+        return Mono.error(new BookValidationException(AppErrorCode.INVALID_BOOK_DATA, "Book ID cannot be null"));
+    }
+
+
+    // Validate if Book name is not null or empty
+    public Mono<Boolean> isBookNameValid(String name) {
+        if (name != null && !name.trim().isEmpty()) {
+            return Mono.just(true);
+        }
+        return Mono.error(new BookValidationException(AppErrorCode.INVALID_BOOK_DATA ,"Book name cannot be empty or null"));
+    }
+
+    public Mono<Boolean> isBookPubliserValid(String publiserName) {
+        if (publiserName != null && !publiserName.trim().isEmpty()) {
+            return Mono.just(true);
+        }
+        return Mono.error(new BookNotFoundException(AppErrorCode.BOOK_CREATION_FAILED ,"Not an valid publiser"));
+    }
+    public Mono<Boolean> isBookObjectValid(Book book) {
+        if (book == null) {
+            return Mono.error(new BookNotFoundException(AppErrorCode.BOOK_NOT_FOUND, "Book object cannot be null"));
+        }
+
+        return isBookIdValid(book.getBookId())
+                .flatMap(valid -> isBookNameValid(book.getName()));
+
+    }
+}

src/main/resources/application.properties

+#spring.application.name=BookInfo
+#
+#
+#server.port=8081
+#spring.r2dbc.url=r2dbc:mysql://localhost:3306/test1
+#spring.r2dbc.username=root
+#spring.r2dbc.password=root
+#spring.r2dbc.driver=mysql
\ No newline at end of file

src/main/resources/application.yml

+spring:
+  r2dbc:
+    driverClassName: mysql
+    hostName: localhost
+    port: 3306
+    databaseName: test1
+    url: r2dbc:mysql://localhost:3306/test1
+    username: root
+    password: root
\ No newline at end of file

src/test/java/com/nisum/BookInfo/BookInfoApplicationTests.java

+package com.nisum.BookInfo;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class BookInfoApplicationTests {
+
+	@Test
+	void contextLoads() {
+	}
+
+}

src/test/java/com/nisum/BookInfo/controller/BookControllerTest.java

+package com.nisum.BookInfo.controller;
+
+import com.nisum.BookInfo.dto.BookDto;
+import com.nisum.BookInfo.entity.Book;
+import com.nisum.BookInfo.mapper.BookMapper;
+import com.nisum.BookInfo.service.BookService;
+import com.nisum.BookInfo.validator.CommonServiceValidator;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.test.web.reactive.server.WebTestClient;
+import reactor.core.publisher.Flux;
+import reactor.core.publisher.Mono;
+import reactor.test.StepVerifier;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.when;
+import static org.springframework.test.web.servlet.client.MockMvcWebTestClient.bindToController;
+
+@SpringBootTest
+class BookControllerTest {
+    @Mock
+    private BookService bookService;  // Mock the BookService
+
+    @Mock
+    private CommonServiceValidator validatorService;  // Mock ValidatorService for book validation
+
+    @InjectMocks
+    private BookController bookController;  // The controller under test
+
+   /* private BookDto validBookDto;
+    private Book savedBook;*/
+
+    @BeforeEach
+    public void setUp() {
+        BookDto bookDto = new BookDto(1, "C++", "This is c++", "C publiser", "Test Author");
+        Book book = new Book(1, "C++", "This is c++", "C publiser", "Test Author");
+
+
+        //when(bookDao.saveBook(any(Book.class))).thenReturn(Mono.just(book));
+        MockitoAnnotations.openMocks(this);
+
+    }
+
+    @Test
+    public void createBook_shouldReturnSuccess_whenBookIsValid() {
+        BookDto bookDto = new BookDto(1, "C++", "This is c++", "C publiser", "Test Author");
+        Book book = new Book(1, "C++", "This is c++", "C publiser", "Test Author");
+
+        // Mock the validateBook() and saveBook() methods
+        when(validatorService.isBookIdValid(bookDto.getBookId())).thenReturn(Mono.just(true));  // Validation passes
+        when(validatorService.isBookNameValid(bookDto.getName())).thenReturn(Mono.just(true));
+        when(bookService.saveBook(bookDto)).thenReturn(Mono.just(book));  // Return saved book
+
+        // Directly call the controller method (createBook) with the valid BookDto
+        Mono<?> result = bookController.createBook(Mono.just(bookDto));
+
+        // Use StepVerifier to check the result
+        StepVerifier.create(result)
+                .expectNextMatches(response -> {
+                    // Assert that the response is a ResponseEntity with the expected message
+                    assertTrue(response instanceof ResponseEntity);
+                    ResponseEntity<?> responseEntity = (ResponseEntity<?>) response;
+                    assertEquals(HttpStatus.OK, responseEntity.getStatusCode());
+                    return true;
+                })
+                .verifyComplete();  // Ensure the Mono completes without error
+    }
+
+    @Test
+    public void createBook_shouldReturnError_whenValidationFails() {
+        // Given: Create an invalid BookDto (for validation failure)
+        BookDto invalidBookDto = new BookDto(1, "C++", "This is c++", "C publiser", "Test Author");
+        when(validatorService.isBookIdValid(invalidBookDto.getBookId())).thenReturn(Mono.just(true));  // Validation passes
+        when(validatorService.isBookNameValid(invalidBookDto.getName())).thenReturn(Mono.just(true));
+        // Simulate a validation failure (Mono.error)
+        when(bookService.saveBook(invalidBookDto)).thenReturn(Mono.error(new IllegalArgumentException("Invalid publiser data")));
+
+        // Directly call the controller method with invalid BookDto
+        Mono<?> result = bookController.createBook(Mono.just(invalidBookDto));
+
+        // Use StepVerifier to verify that the error is propagated
+        StepVerifier.create(result)
+                .expectError(IllegalArgumentException.class)  // Expect the error thrown by validation
+                .verify();
+
+
+    }
+
+    //for update case
+    @Test
+    void updateBook_ShouldReturnUpdatedBook_WhenIdIsValid() {
+        BookDto bookDto = new BookDto(1, "C++", "This is c++", "C publiser", "Test Author");
+        Book book = new Book(1, "C++", "This is c++", "C publiser", "Test Author");
+
+        // Mock the validateBook() and saveBook() methods
+        when(validatorService.isBookIdValid(bookDto.getBookId())).thenReturn(Mono.just(true));  // Validation passes
+        when(validatorService.isBookNameValid(bookDto.getName())).thenReturn(Mono.just(true));
+        when(bookService.updateBook(any(Integer.class), any(BookDto.class))).thenReturn(Mono.just(book));
+
+        // Make a test call to the controller method
+        Mono<?> result = bookController.updateBook(1, Mono.just(bookDto));
+
+        // StepVerifier to test the result
+        StepVerifier.create(result)
+                .expectNextMatches(response -> {
+                    // Assert that the response is a ResponseEntity with the expected message
+                    assertTrue(response instanceof ResponseEntity);
+                    ResponseEntity<?> responseEntity = (ResponseEntity<?>) response;
+                    assertEquals(HttpStatus.OK, responseEntity.getStatusCode());
+                    return true;
+                })
+                .verifyComplete();  //
+
+
+    }
+    //for getAllBook
+
+    @Test
+    void getAllBooks_ShouldReturnListOfBooks() {
+        Book book1 = new Book(1, "C++", "This is c++", "C publiser", "Test Author");
+        Book book2 = new Book(2, "Java", "This is Java", "Java publiser", "Test Java Author");
+        when(bookService.getAllBooks()).thenReturn(Flux.just(book1, book2));
+
+        // Call the controller method
+        Flux<Book> result = bookController.getAllBooks();
+
+        // Verify the response using StepVerifier
+        StepVerifier.create(result).
+                expectNextMatches(book -> book.getBookId().equals(1))
+                . expectNextMatches(book -> book.getBookId().equals(2))
+                .verifyComplete();  //
+
+    }
+    //get single book
+
+    @Test
+    void getBookById_ShouldReturnBookWithStatusOk() {
+        BookDto bookDto = new BookDto(1, "C++", "This is c++", "C publiser", "Test Author");
+        Book book = new Book(1, "C++", "This is c++", "C publiser", "Test Author");
+
+        when(validatorService.isBookIdValid(bookDto.getBookId())).thenReturn(Mono.just(true));  // Validation passes
+        when(validatorService.isBookNameValid(bookDto.getName())).thenReturn(Mono.just(true));
+        when(bookService.getBookById(1)).thenReturn(Mono.just(book));
+
+        // Call the controller method
+        Mono<?> result = bookController.getBookById(1);
+
+        // Verify the response using StepVerifier
+        StepVerifier.create(result)
+                .expectNextMatches(response -> {
+                    // Assert that the response is a ResponseEntity with the expected message
+                    assertTrue(response instanceof ResponseEntity);
+                    ResponseEntity<?> responseEntity = (ResponseEntity<?>) response;
+                    assertEquals(HttpStatus.OK, responseEntity.getStatusCode());
+                    return true;
+                })
+                .verifyComplete();  //
+
+
+
+    }
+
+    //delete
+    @Test
+    void deleteBook_ShouldReturnOkWhenDeletedSuccessfully() {
+        BookDto bookDto = new BookDto(1, "C++", "This is c++", "C publiser", "Test Author");
+        Book book = new Book(1, "C++", "This is c++", "C publiser", "Test Author");
+
+        when(validatorService.isBookIdValid(bookDto.getBookId())).thenReturn(Mono.just(true));  // Validation passes
+        when(validatorService.isBookNameValid(bookDto.getName())).thenReturn(Mono.just(true));
+        when(bookService.deleteBook(1)).thenReturn(Mono.empty());
+
+        // Call the controller method
+        Mono<?> result = bookController.deleteBook(1);
+
+        // Verify the response using StepVerifier
+        StepVerifier.create(result)
+                .expectNextMatches(response -> {
+                    // Assert that the response is a ResponseEntity with the expected message
+                    assertTrue(response instanceof ResponseEntity);
+                    ResponseEntity<?> responseEntity = (ResponseEntity<?>) response;
+                    assertEquals(HttpStatus.OK, responseEntity.getStatusCode());
+                    return true;
+                })
+                .verifyComplete();  //
+    }
+
+
+
+
+
+}
+
+
+
+
+

src/test/java/com/nisum/BookInfo/dao/BookDaoTest.java

+package com.nisum.BookInfo.dao;
+
+import com.nisum.BookInfo.dto.BookDto;
+import com.nisum.BookInfo.entity.Book;
+import com.nisum.BookInfo.service.BookService;
+import com.nisum.BookInfo.service.BookServiceImpl;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.Mockito;
+import org.mockito.MockitoAnnotations;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.r2dbc.core.DatabaseClient;
+import reactor.core.publisher.Mono;
+import reactor.test.StepVerifier;
+
+import static org.mockito.Mockito.*;
+
+@SpringBootTest
+class BookDaoTest {
+
+    @Mock
+    private DatabaseClient databaseClient;
+
+    @InjectMocks
+    private BookServiceImpl bookService;
+
+
+
+    //private Book book;
+
+    @BeforeEach
+    public void setUp() {
+
+      //  book = new Book(1, "Java Book", "A test description", "Test Publisher", "Test Author");
+      //  BookDto bookDto = new BookDto(1, "C++", "This is c++", "C publiser", "Test Author");
+       // Book book = new Book(1, "C++", "This is c++", "C publiser", "Test Author");
+    }
+
+    @Test
+    public void testSaveBook_Success() {
+        BookDto bookDto = new BookDto(1, "C++", "This is c++", "C publiser", "Test Author");
+        Book book = new Book(1, "C++", "This is c++", "C publiser", "Test Author");
+
+        DatabaseClient.GenericExecuteSpec executeSpec = mock(DatabaseClient.GenericExecuteSpec.class);
+
+        when(databaseClient.sql("INSERT INTO book_details (book_id, book_name, book_desc, book_publiser, book_author) VALUES (:bookId, :name, :desc, :publiser, :author)"))
+                .thenReturn(executeSpec);
+        when(executeSpec.bind(1, bookDto.getBookId())).thenReturn(executeSpec);
+        when(executeSpec.bind("C++", bookDto.getName())).thenReturn(executeSpec);
+        when(executeSpec.bind("This is c++", bookDto.getDesc())).thenReturn(executeSpec);
+        when(executeSpec.bind("C publiser", bookDto.getPubliser())).thenReturn(executeSpec);
+        when(executeSpec.bind("Test Author", bookDto.getAuthor())).thenReturn(executeSpec);
+
+
+        // Call the saveBook method
+        Mono<Book> result = bookService.saveBook(bookDto);
+
+
+        StepVerifier.create(result)
+                .expectNext(book)  // Expect the book to be returned after saving
+                .verifyComplete();  // The Mono should complete successfully
+    }
+
+
+
+}
+
+
+

src/test/java/com/nisum/BookInfo/service/BookServiceImplTest.java

+package com.nisum.BookInfo.service;
+
+import com.nisum.BookInfo.dao.BookDao;
+import com.nisum.BookInfo.dto.BookDto;
+import com.nisum.BookInfo.entity.Book;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.springframework.boot.test.context.SpringBootTest;
+import reactor.core.publisher.Flux;
+import reactor.core.publisher.Mono;
+import reactor.test.StepVerifier;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.*;
+
+@SpringBootTest
+
+class BookServiceImplTest {
+
+    @Mock
+    private BookDao bookDao;  // Mock the BookDao
+
+    @InjectMocks
+    private BookServiceImpl bookService;  // Service under test
+
+    private BookDto bookDto;
+    private Book book;
+
+    @BeforeEach
+    public void setUp() {
+        // Set up test data
+        bookDto = new BookDto(1, "C++", "This is c++", "C publiser", "Test Author");
+        book = new Book(1, "C++", "This is c++", "C publiser", "Test Author");
+
+
+        //when(bookDao.saveBook(any(Book.class))).thenReturn(Mono.just(book));
+        MockitoAnnotations.openMocks(this);
+
+    }
+
+    @Test
+    public void saveBook_shouldSaveBookAndReturnMonoBook() {
+        // Call the saveBook method of the service
+        when(bookDao.saveBook(any(Book.class))).thenReturn(Mono.just(book));
+        Mono<Book> result = bookService.saveBook(bookDto);
+
+        // Verify the result using StepVerifier (for reactive streams)
+        StepVerifier.create(result)
+                .expectNextMatches(savedBook -> {
+                    // Assert the values in the saved Book are as expected
+                    assertEquals("C++", savedBook.getName());
+                    assertEquals("Test Author", savedBook.getAuthor());
+                    assertEquals("C publiser", savedBook.getPubliser());
+                    return true;
+                })
+                .verifyComplete();
+
+        // Verify that bookDao.saveBook was called exactly once
+        verify(bookDao, times(1)).saveBook(any(Book.class));
+    }
+
+    @Test
+    public void getAllBooks_shouldReturnFluxOfBooks() {
+        // Prepare a Flux of books for testing
+        Book book1 = new Book(1, "C++", "This is c++", "C publiser", "Test Author");
+        Book book2 = new Book(2, "Java", "This is c++", "C publiser", "Test Author");
+        Flux<Book> bookFlux = Flux.just(book1, book2);
+
+        // Mock the getAllBooks method to return the Flux of books
+        when(bookDao.getAllBooks()).thenReturn(bookFlux);
+        Flux<Book> result = bookService.getAllBooks();
+
+        // Verify the result using StepVerifier (for reactive streams)
+        StepVerifier.create(result)
+                .expectNextMatches(book -> book.getName().equals("C++"))
+                .expectNextMatches(book -> book.getName().equals("Java"))
+                .verifyComplete();
+
+        // Verify that bookDao.getAllBooks was called exactly once
+        verify(bookDao, times(1)).getAllBooks();
+    }
+
+    @Test
+    public void getBookById_shouldReturnBook_whenBookExists() {
+        //Setup
+        int bookId = 1;
+        book = new Book(bookId, "C++", "This is c++", "C publiser", "Test Author");
+
+        // Mock the getBookById method to return the expected Mono<Book>
+        when(bookDao.getBookById(bookId)).thenReturn(Mono.just(book));
+        //setupend
+
+        // Call the getBookById method of the service
+        Mono<Book> result = bookService.getBookById(bookId);
+
+        // Verify the result using StepVerifier (for reactive streams)
+        StepVerifier.create(result)
+                .expectNextMatches(savedBook -> {
+                    // Assert the book details
+                    assertEquals(bookId, savedBook.getBookId());
+                    assertEquals("C++", savedBook.getName());
+                    assertEquals("Test Author", savedBook.getAuthor());
+                    assertEquals("C publiser", savedBook.getPubliser());
+                    return true;
+                })
+                .verifyComplete();
+
+        // Verify that bookDao.getBookById was called exactly once
+        verify(bookDao, times(1)).getBookById(bookId);
+    }
+
+    @Test
+    public void getBookById_shouldReturnEmpty_whenBookDoesNotExist() {
+        //setup
+        int bookId = 1;
+        book = new Book(bookId, "C++", "This is c++", "C publiser", "Test Author");
+
+        // Mock the getBookById method to return the expected Mono<Book>
+        when(bookDao.getBookById(bookId)).thenReturn(Mono.just(book));
+        //setupend
+        // Mock the DAO method to return an empty Mono when no book is found
+        when(bookDao.getBookById(999)).thenReturn(Mono.empty());
+
+        // Call the getBookById method with a non-existent ID
+        Mono<Book> result = bookService.getBookById(999);
+
+        // Verify the result is empty (no book found)
+        StepVerifier.create(result)
+                .expectComplete()  // Should complete without emitting anything
+                .verify();
+
+        // Verify that bookDao.getBookById was called exactly once
+        verify(bookDao, times(1)).getBookById(999);
+    }
+
+
+    @Test
+    public void updateBook_shouldReturnUpdatedBook_whenBookExists() {
+        int bookId = 1;
+        bookDto = new BookDto(1, "C++", "This is c++", "C publiser", "Test Author");
+        book = new Book(1, "C++", "This is c++", "C publiser", "Test Author");
+        // Mock the DAO method to return the updated book
+        when(bookDao.updateBook(eq(bookId), any(Book.class))).thenReturn(Mono.just(book));
+
+        // Call the updateBook method of the service
+        Mono<Book> result = bookService.updateBook(bookId, bookDto);
+
+        // Verify the result using StepVerifier
+        StepVerifier.create(result)
+                .expectNextMatches(updatedBook -> {
+                    // Assert that the book is updated with the correct fields
+                    assertEquals(bookId, updatedBook.getBookId());
+                    assertEquals("C++", updatedBook.getName());
+                    assertEquals("Test Author", updatedBook.getAuthor());
+                    assertEquals("C publiser", updatedBook.getPubliser());
+                    return true;
+                })
+                .verifyComplete();
+
+        // Verify that bookDao.updateBook was called with the correct bookId and book
+        verify(bookDao, times(1)).updateBook(eq(bookId), any(Book.class));
+    }
+
+    @Test
+    public void updateBook_shouldReturnEmpty_whenBookDoesNotExist() {
+        int bookId = 1;
+        bookDto = new BookDto(1, "C++", "This is c++", "C publiser", "Test Author");
+        book = new Book(1, "C++", "This is c++", "C publiser", "Test Author");
+        // Mock the DAO method to return an empty Mono (book not found)
+        when(bookDao.updateBook(eq(999), any(Book.class))).thenReturn(Mono.empty());
+
+        // Call the updateBook method with a non-existent bookId
+        Mono<Book> result = bookService.updateBook(999, bookDto);
+
+        // Verify that the result is empty (no book found to update)
+        StepVerifier.create(result)
+                .expectComplete()  // Should complete without emitting anything
+                .verify();
+
+        // Verify that bookDao.updateBook was called with the non-existent bookId
+        verify(bookDao, times(1)).updateBook(eq(999), any(Book.class));
+    }
+
+    @Test
+    public void deleteBook_shouldCompleteSuccessfully_whenBookExists() {
+        int  bookId = 1;
+        // Mock the DAO method to simulate successful deletion
+        when(bookDao.deleteBook(bookId)).thenReturn(Mono.empty());
+
+        // Call the deleteBook method of the service
+        Mono<Void> result = bookService.deleteBook(bookId);
+
+        // Verify the result using StepVerifier
+        StepVerifier.create(result)
+                .verifyComplete();  // Should complete without emitting anything
+
+        // Verify that bookDao.deleteBook was called exactly once with the correct bookId
+        verify(bookDao, times(1)).deleteBook(bookId);
+    }
+
+    @Test
+    public void deleteBook_shouldCompleteSuccessfully_whenBookDoesNotExist() {
+        int  bookId = 1;
+        // Mock the DAO method to simulate a case where no book is found
+        when(bookDao.deleteBook(999)).thenReturn(Mono.empty());
+
+        // Call the deleteBook method with a non-existent bookId
+        Mono<Void> result = bookService.deleteBook(999);
+
+        // Verify that the result completes without emitting any value (book not found)
+        StepVerifier.create(result)
+                .verifyComplete();  // Should complete without emitting anything
+
+        // Verify that bookDao.deleteBook was called exactly once with the non-existent bookId
+        verify(bookDao, times(1)).deleteBook(999);
+    }
+
+        }
+