adding reactive webflux assignment

HELP.md

+# Getting Started
+
+### Reference Documentation
+For further reference, please consider the following sections:
+
+* [Official Gradle documentation](https://docs.gradle.org)
+* [Spring Boot Gradle Plugin Reference Guide](https://docs.spring.io/spring-boot/docs/2.5.9/gradle-plugin/reference/html/)
+* [Create an OCI image](https://docs.spring.io/spring-boot/docs/2.5.9/gradle-plugin/reference/html/#build-image)
+* [Spring Data R2DBC](https://docs.spring.io/spring-boot/docs/2.6.3/reference/html/spring-boot-features.html#boot-features-r2dbc)
+
+### Guides
+The following guides illustrate how to use some features concretely:
+
+* [Acessing data with R2DBC](https://spring.io/guides/gs/accessing-data-r2dbc/)
+* [Accessing data with MySQL](https://spring.io/guides/gs/accessing-data-mysql/)
+
+### Additional Links
+These additional references should also help you:
+
+* [Gradle Build Scans – insights for your project's build](https://scans.gradle.com#gradle)
+* [R2DBC Homepage](https://r2dbc.io)
+

build.gradle

+plugins {
+	id 'org.springframework.boot' version '2.5.9'
+	id 'io.spring.dependency-management' version '1.0.11.RELEASE'
+	id 'java'
+}
+
+group = 'com.example'
+version = '0.0.1-SNAPSHOT'
+sourceCompatibility = '1.8'
+
+configurations {
+	compileOnly {
+		extendsFrom annotationProcessor
+	}
+}
+
+repositories {
+	mavenCentral()
+}
+
+dependencies {
+	implementation 'org.springframework.boot:spring-boot-starter-data-r2dbc'
+	implementation 'org.springframework.boot:spring-boot-starter-webflux'
+	compileOnly 'org.projectlombok:lombok'
+	runtimeOnly 'dev.miku:r2dbc-mysql'
+	runtimeOnly 'mysql:mysql-connector-java'
+	annotationProcessor 'org.projectlombok:lombok'
+	testImplementation 'org.springframework.boot:spring-boot-starter-test'
+	testImplementation 'io.projectreactor:reactor-test'
+}
+
+tasks.named('test') {
+	useJUnitPlatform()
+}

build/bootRunMainClassName

+com.example.ascend.demo.database.Application
\ No newline at end of file

build/resources/main/application.properties

+spring.r2dbc.url=r2dbc:pool:mysql://localhost:3306/mysql
+spring.r2dbc.username=root
+spring.r2dbc.password=Loving@Life1
+

gradle/wrapper/gradle-wrapper.properties

+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.4-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

gradlew

+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed 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
+#
+#      https://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.
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/master/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
+
+APP_NAME="Gradle"
+APP_BASE_NAME=${0##*/}
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$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
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+# Collect all arguments for the java command;
+#   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
+#     shell script including quotes and variable substitutions, so put them in
+#     double quotes to make sure that they get re-expanded; and
+#   * put everything else in single quotes, so that it's not re-expanded.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

gradlew.bat

+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

settings.gradle

+rootProject.name = 'ascend.demo.database'

src/main/java/com/example/ascend/demo/database/Application.java

+package com.example.ascend.demo.database;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class Application {
+
+	public static void main(String[] args) {
+		SpringApplication.run(Application.class, args);
+	}
+
+}

src/main/java/com/example/ascend/demo/database/controller/EmployeeController.java

+package com.example.ascend.demo.database.controller;
+
+import com.example.ascend.demo.database.model.Employee;
+import com.example.ascend.demo.database.model.EmployeeResponse;
+import com.example.ascend.demo.database.repository.EmployeeRepository;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+import reactor.core.publisher.Flux;
+import reactor.core.publisher.Mono;
+
+import java.util.List;
+
+@RestController
+
+
+public class EmployeeController {
+    @Autowired
+    private EmployeeRepository employeeRepository;
+
+   // @GetMapping("employees")
+   // public Mono<EmployeeResponse> getEmployees() {
+    //    return employeeRepository.findAll().collectList().flatMap(employees -> {
+  //         return new Mono<EmployeeResponse>(EmployeeResponse.builder()
+      //              .status("OK")
+       //             .statusCode(HttpStatus.OK.value())
+          //          .employees(employees)
+         //           .message("Got Success Response")
+          //          .build(), HttpStatus.OK);
+      //  });
+
+
+//        return new ResponseEntity<Flux<EmployeeResponse>>(Flux.just(EmployeeResponse.builder()
+//                .status("OK")
+//                .statusCode(HttpStatus.OK.value())
+//                .employeeFlux(employeeRepository.findAll())
+//                .message("Got Success Response")
+//                .build()), HttpStatus.OK);
+//return empList.map(empVal->EmployeeResponse.builder().
+//        status("OK").statusCode("200").message("SuccessResponse").
+//        singleData(empVal).build());
+
+
+            @GetMapping("/employees")
+            public Mono<ResponseEntity<EmployeeResponse>> getEmployees() {
+                return employeeRepository.findAll()
+                        .collectList()
+                        .map(empList ->ResponseEntity.ok(EmployeeResponse.builder()
+                                .status("OK")
+                                .statusCode(HttpStatus.OK.value())
+                                .employeeData(empList)
+                                .message("Got Success Response")
+                                .build()))
+                        .defaultIfEmpty(new ResponseEntity<>(HttpStatus.NOT_FOUND));
+            }
+
+
+            @PostMapping("employees")
+            public Mono<Employee> saveEmployee(@RequestBody Employee employee){
+           return employeeRepository.save(employee);
+            }
+
+            @DeleteMapping("employees/{id}")
+          public Mono<?> deleteEmployee(@PathVariable Long id){
+            return employeeRepository.deleteById(id);
+             }
+
+             @PutMapping("employee/{id}")
+           public  Mono<ResponseEntity<EmployeeResponse>> updateEmployee(@PathVariable Long id, @RequestBody Employee updateEmployee){
+            return employeeRepository.findById(id)
+                  .flatMap(existingEmployee -> {
+                    existingEmployee.setEmployeeName(updateEmployee.getEmployeeName());
+                    return employeeRepository.save(existingEmployee);
+                }).map(updatedEmployee -> ResponseEntity.ok(EmployeeResponse.builder()
+                        .status("OK")
+                        .statusCode(HttpStatus.OK.value())
+                        .data(updatedEmployee)
+                        .message("Got Success Response")
+                        .build()))
+                .defaultIfEmpty(new ResponseEntity<>(HttpStatus.NOT_FOUND));
+
+    }
+
+    @PostMapping(value="/")
+
+    public Mono<ResponseEntity<EmployeeResponse>> addEmployeeByID(@RequestBody Employee employee) {
+        Mono<Employee> addedEmployee = employeeRepository.save(employee);
+        return addedEmployee.map(addEmp -> ResponseEntity.status(HttpStatus.OK).
+                        body(EmployeeResponse.builder().
+                                status("OK").statusCode(HttpStatus.OK.value()).message("Got the Success Response").
+                                data(addEmp).build())).
+                defaultIfEmpty(new ResponseEntity<>(HttpStatus.NOT_FOUND));
+    }
+
+
+
+
+    }
+
+
+

src/main/java/com/example/ascend/demo/database/model/Employee.java

+package com.example.ascend.demo.database.model;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+import org.springframework.data.annotation.Id;
+import org.springframework.data.relational.core.mapping.Column;
+import org.springframework.data.relational.core.mapping.Table;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+@Builder
+@Table(value="employee")
+public class Employee {
+
+    @Id
+    @Column(value ="EMP_ID")
+    private Long employeeId;
+    @Column(value ="EMP_NAME")
+    private String employeeName;
+}

src/main/java/com/example/ascend/demo/database/model/EmployeeResponse.java

+package com.example.ascend.demo.database.model;
+import com.fasterxml.jackson.annotation.JsonInclude;
+import lombok.*;
+import reactor.core.publisher.Flux;
+
+import java.util.List;
+
+@JsonInclude(JsonInclude.Include.NON_NULL)
+@Builder
+@Getter
+@Setter
+@NoArgsConstructor
+@AllArgsConstructor
+public class EmployeeResponse {
+
+    private String status;
+    private int statusCode;
+    private Employee data;
+    private String message;
+    private List<Employee> employees;
+    private List<Employee> employeeData;
+
+}
+

src/main/java/com/example/ascend/demo/database/repository/EmployeeRepository.java

+package com.example.ascend.demo.database.repository;
+
+import com.example.ascend.demo.database.model.Employee;
+import org.springframework.data.repository.reactive.ReactiveCrudRepository;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface EmployeeRepository extends ReactiveCrudRepository<Employee,Long >{
+}

src/main/resources/application.properties

+spring.r2dbc.url=r2dbc:pool:mysql://localhost:3306/mysql
+spring.r2dbc.username=root
+spring.r2dbc.password=Loving@Life1
+

src/test/java/com/example/ascend/demo/database/ApplicationTests.java

+package com.example.ascend.demo.database;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class ApplicationTests {
+
+	@Test
+	void contextLoads() {
+	}
+
+}