Initial Version of Spring-Webflux

user-service/.gitignore

+.gradle
+/build/
+!gradle/wrapper/gradle-wrapper.jar
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+nbproject/private/
+build/
+nbbuild/
+dist/
+nbdist/
+.nb-gradle/
\ No newline at end of file

user-service/README.md

+# Spring Boot Webflux Reactive Mongo
+
+This is a sample application that shows how to build a web application using
+ - Spring Boot 2
+ - Spring Webflux
+ - Spring Reactive Data MongoDb
+
+ 
+<br/>
+Please see the following pages for more details
+  
+  - Spring Web Reactive <br/><a>http://docs.spring.io/spring-framework/docs/5.0.0.M1/spring-framework-reference/html/web-reactive.html</a>
+  - Spring Data Reactive <br/><a>https://spring.io/blog/2016/11/28/going-reactive-with-spring-data</a>
+  - Spring Functional Web Framework <br/><a>https://spring.io/blog/2016/09/22/new-in-spring-5-functional-web-framework</a>
+
+## Running
+
+In application.properties, configure appropriate values.
+<br/>
+<br/>
+Run this using using the gradle wrapper included
+
+```
+./gradlew bootRun
+```
+
+ .route(GET("/users/{id}").and(accept(APPLICATION_JSON)), userHandler::getUser)
+                .andRoute(GET("/users").and(accept(APPLICATION_JSON)), userHandler::getUsers)
+                .andRoute(POST("/users").and(accept(APPLICATION_JSON)).and(contentType(APPLICATION_JSON)), userHandler::createUser)
+                .andRoute(PUT("/users/updateuser/{id}").and(accept(APPLICATION_JSON)).and(contentType(APPLICATION_JSON)), userHandler::updateUser)
+                .andRoute(DELETE("/users/deleteuser/{id}"), userHandler::deleteUser)
+
+And then go to http://localhost:8080 to test the API's.
+
+`http://localhost:8080/users/1`  :  Get the User by passing the attribute id using GET
+
+`http://localhost:8080/users`  : Get the User Details using GET
+
+`http://localhost:8080/users`  : Create the User using POST
+
+`http://localhost:8080/users/updateuser/{id}`  : Update the User details using PUT
+
+`http://localhost:8080/users/deleteuser/{id}` :  Delete the User by passing the attribute id using DELETE
+

user-service/build.gradle

+buildscript {
+	ext {
+		springBootVersion = '2.1.8.RELEASE'
+	}
+	repositories {
+		mavenCentral()
+	}
+	dependencies {
+		classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
+	}
+}
+
+apply plugin: 'java'
+apply plugin: 'idea'
+apply plugin: 'eclipse'
+apply plugin: 'org.springframework.boot'
+apply plugin: 'io.spring.dependency-management'
+
+version = '0.0.1-SNAPSHOT'
+sourceCompatibility = 1.8
+
+repositories {
+	mavenCentral()
+	jcenter()
+}
+
+
+dependencies {
+	compile('org.springframework.boot:spring-boot-starter-data-mongodb-reactive')
+	compile('org.springframework.boot:spring-boot-starter-webflux')
+	compileOnly('org.projectlombok:lombok')
+
+	/*testImplementation('org.springframework.boot:spring-boot-starter-test') {
+		exclude group: 'org.junit.vintage', module: 'junit-vintage-engine'
+	}*/
+	testImplementation('org.springframework.boot:spring-boot-starter-test') 
+	testImplementation 'io.projectreactor:reactor-test'
+	testImplementation('junit:junit:4.13')
+	testCompile group: 'org.junit.jupiter', name: 'junit-jupiter-api', version: '5.6.2'
+	testCompile('de.flapdoodle.embed:de.flapdoodle.embed.mongo')
+
+}
+
+test {
+	useJUnitPlatform()
+}
\ No newline at end of file

user-service/gradle/wrapper/gradle-wrapper.properties

+#Thu Sep 07 21:24:57 WIB 2017
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.5.1.zip

user-service/gradlew

+#!/usr/bin/env sh
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS=""
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn ( ) {
+    echo "$*"
+}
+
+die ( ) {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$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" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=$((i+1))
+    done
+    case $i in
+        (0) set -- ;;
+        (1) set -- "$args0" ;;
+        (2) set -- "$args0" "$args1" ;;
+        (3) set -- "$args0" "$args1" "$args2" ;;
+        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save ( ) {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=$(save "$@")
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
+if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
+  cd "$(dirname "$0")"
+fi
+
+exec "$JAVACMD" "$@"

user-service/gradlew.bat

+@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 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=
+
+@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 init
+
+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 init
+
+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
+
+:init
+@rem Get command-line arguments, handling Windows variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_args
+
+:win9xME_args
+@rem Slurp the command line arguments.
+set CMD_LINE_ARGS=
+set _SKIP=2
+
+:win9xME_args_slurp
+if "x%~1" == "x" goto execute
+
+set CMD_LINE_ARGS=%*
+
+: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 %CMD_LINE_ARGS%
+
+: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

user-service/manifest.yml

+applications:
+  - name: SpringWebFluxMongoDB
+    memory: 768M
+    instances: 1
+    path: build\libs\user-service-0.0.1-SNAPSHOT.jar
+    random-route: true
+    services:
+      - mongodb
+    buildpacks:
+      - https://github.com/cloudfoundry/java-buildpack.git

user-service/out/production/resources/application.properties

+spring.data.mongodb.uri=mongodb://localhost:27017/oms
\ No newline at end of file

user-service/out/production/resources/application.yml

+#spring:
+ # data:
+  #  mongodb:
+   #   uri: mongodb://harichandraprasad.nimmagadda@gmail.com:HariPriya4$@ds139956.mlab.com:39956/demo
+     # host: localhost
+     # port: 27017
+     # database: demo
\ No newline at end of file

user-service/src/lombok.config

+lombok.anyConstructor.addConstructorProperties=true
+config.stopBubbling = true
+lombok.fieldDefaults.defaultPrivate = true
\ No newline at end of file

user-service/src/main/java/com/nisum/ecommerce/oms/UserApplication.java

+package com.nisum.ecommerce.oms;
+
+import com.nisum.ecommerce.oms.model.User;
+import com.nisum.ecommerce.oms.repository.UserRepository;
+import org.springframework.boot.CommandLineRunner;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.Bean;
+import reactor.core.publisher.Flux;
+import reactor.core.publisher.Mono;
+
+
+@SpringBootApplication
+public class UserApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(UserApplication.class, args);
+    }
+
+    /*@Bean
+    public CommandLineRunner user(UserRepository repository) {
+
+        final User hendi = new User(1, "Hendi",  "Santika@gmail.com");
+        final User naruto = new User(2, "Uzumaki", "Naruto@gmail.com");
+        final User sasuke = new User(3, "Uchiha",  "Sasuke@gmail.com");
+        final User sakura = new User(4, "Sakura", "Haruno@gmail.com");
+        final User kakashi = new User(5, "Hatake", "Kakashi@gmail.com");
+
+        repository.saveAll(Flux.just(hendi, naruto, sasuke, sakura, kakashi)).subscribe();
+       // repository.findByName("hendi").log().map(User::getName).subscribe(System.out::println);
+        //repository.findById("hendi").log().map(User::getId).subscribe(System.out::println);
+
+
+        return (args) -> {
+//			// save users
+            repository.save(new User(1, "Hendi",  "Santika@gmail.com"));
+            repository.save(new User(2, "Uzumaki", "Naruto@gmail.com"));
+            repository.save(new User(3, "Uchiha",  "Sasuke@gmail.com"));
+            repository.save(new User(4, "Sakura", "Haruno@gmail.com"));
+            repository.save(new User(5, "Hatake", "Kakashi@gmail.com"));
+        };
+    }*/
+}

user-service/src/main/java/com/nisum/ecommerce/oms/components/UserRouter.java

+package com.nisum.ecommerce.oms.components;
+
+import com.nisum.ecommerce.oms.handlers.UserHandler;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.http.MediaType;
+import org.springframework.web.reactive.function.server.RouterFunction;
+import org.springframework.web.reactive.function.server.RouterFunctions;
+import org.springframework.web.reactive.function.server.ServerResponse;
+
+import static org.springframework.http.MediaType.APPLICATION_JSON;
+import static org.springframework.web.reactive.function.server.RequestPredicates.*;
+
+@Configuration
+public class UserRouter {
+
+    @Bean
+    public RouterFunction<ServerResponse> routes(UserHandler userHandler) {
+        return RouterFunctions
+                .route(GET("/users/{id}").and(accept(APPLICATION_JSON)), userHandler::getUser)
+                .andRoute(GET("/users").and(accept(APPLICATION_JSON)), userHandler::getUsers)
+                .andRoute(POST("/users").and(accept(APPLICATION_JSON)).and(contentType(APPLICATION_JSON)), userHandler::createUser)
+                .andRoute(PUT("/users/updateuser/{id}").and(accept(APPLICATION_JSON)).and(contentType(APPLICATION_JSON)), userHandler::updateUser)
+                .andRoute(DELETE("/users/deleteuser/{id}"), userHandler::deleteUser)
+                .andRoute(GET("/users/events").and(accept(APPLICATION_JSON)), userHandler::getUserByEvents);
+    }
+
+   /* @Bean
+    public RouterFunction<ServerResponse> userRoutes(UserHandler userHandler) {
+
+        return RouterFunctions.route()
+                .path("/users", builder -> builder
+                        .POST("", accept(APPLICATION_JSON), userHandler::createUser)
+                        .GET("/{id}", accept(APPLICATION_JSON), userHandler::getUser)
+                        .GET("", accept(APPLICATION_JSON), userHandler::getUsers))
+                        .PUT("/updateuser/{id}", accept(APPLICATION_JSON), userHandler::updateUser)
+                        .DELETE("/deleteuser/{id}", accept(APPLICATION_JSON), userHandler::deleteUser)
+                        .GET("/{id}/events", accept(APPLICATION_JSON), userHandler::getUserByEvents)
+                .build();
+    }
+*/
+}

user-service/src/main/java/com/nisum/ecommerce/oms/config/CORSConfig.java

+package com.nisum.ecommerce.oms.config;
+
+import org.springframework.context.annotation.Configuration;
+import org.springframework.web.reactive.config.CorsRegistry;
+import org.springframework.web.reactive.config.EnableWebFlux;
+import org.springframework.web.reactive.config.WebFluxConfigurer;
+
+@Configuration
+@EnableWebFlux
+public class CORSConfig implements WebFluxConfigurer {
+
+    @Override
+    public void addCorsMappings(CorsRegistry registry) {
+        registry.addMapping("/**")
+                .allowedOrigins("*")
+                .allowedMethods("GET, POST, PUT, DELETE")
+                .allowedHeaders("*");
+    }
+}

user-service/src/main/java/com/nisum/ecommerce/oms/handlers/UserHandler.java

+package com.nisum.ecommerce.oms.handlers;
+
+import com.nisum.ecommerce.oms.model.User;
+import com.nisum.ecommerce.oms.model.UserEvents;
+import com.nisum.ecommerce.oms.repository.UserRepository;
+import lombok.AllArgsConstructor;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
+import org.springframework.stereotype.Component;
+import org.springframework.web.reactive.function.BodyInserters;
+import org.springframework.web.reactive.function.server.ServerRequest;
+import org.springframework.web.reactive.function.server.ServerResponse;
+import reactor.core.publisher.Flux;
+import reactor.core.publisher.Mono;
+
+import java.time.Duration;
+import java.util.Date;
+import java.util.stream.Stream;
+
+import static org.springframework.http.MediaType.APPLICATION_JSON;
+import static org.springframework.web.reactive.function.BodyInserters.fromPublisher;
+import static org.springframework.web.reactive.function.server.ServerResponse.notFound;
+import static org.springframework.web.reactive.function.server.ServerResponse.ok;
+
+@Component
+public class UserHandler {
+
+    private UserRepository userRepository;
+
+    public UserHandler(UserRepository userRepository) {
+        this.userRepository = userRepository;
+    }
+
+    public Mono<ServerResponse> createUser(ServerRequest request) {
+        Mono<User> user = request.bodyToMono(User.class);
+        return ServerResponse.ok().contentType(MediaType.APPLICATION_JSON)
+                .body(fromPublisher(user.flatMap(userRepository::save), User.class));
+    }
+
+    public Mono<ServerResponse> getUser(ServerRequest request) {
+
+        final int id = Integer.parseInt(request.pathVariable("id"));
+        final Mono<User> user = userRepository.findById(id);
+        return user.flatMap(usr -> ok().contentType(APPLICATION_JSON)
+                .body(fromPublisher(user, User.class)))
+                .switchIfEmpty(notFound().build());
+    }
+
+    public Mono<ServerResponse> getUsers(ServerRequest request) {
+        return ok().contentType(APPLICATION_JSON)
+                .body(fromPublisher(userRepository.findAll(), User.class));
+    }
+
+    /*public Mono<ServerResponse> deleteUser(ServerRequest request) {
+
+        final int userId = Integer.parseInt(request.pathVariable("id"));
+
+        final Mono<User> user = userRepository.findById(userId);
+
+        return user
+                .flatMap(existingUser ->
+                        userRepository.deleteById(existingUser.getId())
+                                .flatMap(usr -> ok().contentType(APPLICATION_JSON)
+                                .body(fromPublisher(user, User.class))
+                                        .switchIfEmpty(notFound().build())
+                                ));
+
+    }*/
+
+    /*public Mono<ServerResponse> deleteUser(ServerRequest request) {
+
+        final int userId = Integer.parseInt(request.pathVariable("id"));
+
+        final Mono<User> user = userRepository.findById(userId);
+
+        return ServerResponse.ok()
+                .contentType(APPLICATION_JSON)
+                .body(user.flatMap(existingUser ->
+                        userRepository.deleteById(existingUser.getId())), Void.class);
+    }*/
+
+    public Mono<ServerResponse> deleteUser(ServerRequest request) {
+
+        final int userId = Integer.parseInt(request.pathVariable("id"));
+
+        final Mono<User> user = userRepository.findById(userId);
+
+        return userRepository.findById(userId)
+                        .flatMap(existingUser ->
+                                            userRepository.delete(existingUser)
+                                            .then(ServerResponse.ok().<Void>build())
+                             ).switchIfEmpty(notFound().build());
+    }
+
+    public Mono<ServerResponse> updateUser(ServerRequest request) {
+
+       /* final int userId = Integer.parseInt(request.pathVariable("id"));
+        final Mono<User> userRepositoryById = userRepository.findById(userId);*/
+
+        Mono<User> userMono = request.bodyToMono(User.class);
+
+       return ServerResponse.ok()
+                .contentType(APPLICATION_JSON)
+                .body(BodyInserters.fromPublisher(
+                       userMono.flatMap(userRepository::save), User.class)
+               ).switchIfEmpty(notFound().build());
+
+    }
+
+    public Mono<ServerResponse> getUserByEvents(ServerRequest serverRequest) {
+        Integer userId = Integer.valueOf(serverRequest.pathVariable("id"));
+        return  ServerResponse.ok()
+                .contentType(MediaType.TEXT_EVENT_STREAM)
+                .body(
+                        userRepository.findById(userId)
+                                .flatMapMany(employee -> {
+                                    Flux<Long> intervalFlux = Flux.interval(Duration.ofSeconds(2));
+
+                                    Flux<UserEvents> employeeEventsFlux =
+                                            Flux.fromStream(Stream.generate(()-> new UserEvents(employee, new Date())));
+
+                                    return Flux.zip(intervalFlux,employeeEventsFlux).map(objects -> objects.getT2());
+                                }), UserEvents.class
+                );
+    }
+
+}

user-service/src/main/java/com/nisum/ecommerce/oms/model/User.java

+package com.nisum.ecommerce.oms.model;
+
+
+import lombok.*;
+import org.springframework.data.annotation.Id;
+import org.springframework.data.mongodb.core.mapping.Document;
+
+@Getter
+@Setter
+@Builder(toBuilder = true)
+@ToString
+@AllArgsConstructor
+@NoArgsConstructor
+@Document(collection = "user")
+public class User {
+
+    @Id
+    Integer id;
+
+    String name;
+
+    String email;
+
+    public User(String name) {
+
+        this.name = name;
+    }
+
+    /*public User(Integer id, String name, String email) {
+        this.id = id;
+        this.name = name;
+        this.email = email;
+    }*/
+
+/*
+    public Integer getId() {
+        return id;
+    }
+
+    public void setId(Integer id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getEmail() {
+        return email;
+    }
+
+    public void setEmail(String email) {
+        this.email = email;
+    }
+
+    @Override
+    public String toString() {
+        return "User{" +
+                "id='" + id + '\'' +
+                ", name='" + name + '\'' +
+                ", email='" + email + '\'' +
+                '}';
+    }
+*/
+}

user-service/src/main/java/com/nisum/ecommerce/oms/model/UserEvents.java

+package com.nisum.ecommerce.oms.model;
+
+
+import java.util.Date;
+
+public class UserEvents {
+
+    private User user;
+    private Date date;
+
+    public UserEvents(User user, Date date) {
+        this.user = user;
+        this.date = date;
+    }
+
+    public User getUser() {
+        return user;
+    }
+
+    public void setUser(User user) {
+        this.user = user;
+    }
+
+    public Date getDate() {
+        return date;
+    }
+
+    public void setDate(Date date) {
+        this.date = date;
+    }
+
+    @Override
+    public String toString() {
+        return "UserEvents{" +
+                "user=" + user +
+                ", date=" + date +
+                '}';
+    }
+}

user-service/src/main/java/com/nisum/ecommerce/oms/repository/UserRepository.java

+package com.nisum.ecommerce.oms.repository;
+
+import com.nisum.ecommerce.oms.model.User;
+import org.springframework.data.mongodb.repository.ReactiveMongoRepository;
+import reactor.core.publisher.Flux;
+import reactor.core.publisher.Mono;
+
+public interface UserRepository extends ReactiveMongoRepository<User, Integer> {
+
+    Flux<User> findAll();
+    Mono<User> findById(int id);
+    Mono<User> findByName(String name);
+    Mono<User> save(User user);
+
+
+}
+

user-service/src/main/resources/application.properties

+spring.data.mongodb.uri=mongodb://localhost:27017/oms
\ No newline at end of file

user-service/src/main/resources/application.yml

+#spring:
+ # data:
+  #  mongodb:
+   #   uri: mongodb://harichandraprasad.nimmagadda@gmail.com:HariPriya4$@ds139956.mlab.com:39956/demo
+     # host: localhost
+     # port: 27017
+     # database: demo
\ No newline at end of file

user-service/src/test/java/com/nisum/ecommerce/oms/UserApplicationTests.java

+package com.nisum.ecommerce.oms;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.junit4.SpringRunner;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest
+public class UserApplicationTests {
+
+	@Test
+	public void contextLoads() {
+	}
+
+}

user-service/src/test/java/com/nisum/ecommerce/oms/controller/TestUserHandlerComponent.java

+package com.nisum.ecommerce.oms.controller;
+
+import com.nisum.ecommerce.oms.components.UserRouter;
+import com.nisum.ecommerce.oms.handlers.UserHandler;
+import com.nisum.ecommerce.oms.model.User;
+import com.nisum.ecommerce.oms.repository.UserRepository;
+
+import org.assertj.core.api.Assertions;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.web.reactive.WebFluxTest;
+import org.springframework.boot.test.mock.mockito.MockBean;
+import org.springframework.context.ApplicationContext;
+import org.springframework.http.MediaType;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringRunner;
+import org.springframework.test.web.reactive.server.WebTestClient;
+import reactor.core.publisher.Flux;
+import reactor.core.publisher.Mono;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.when;
+
+@RunWith(SpringRunner.class)
+@ContextConfiguration(classes = {UserRouter.class, UserHandler.class})
+@WebFluxTest
+public class TestUserHandlerComponent {
+
+    @Autowired
+    private ApplicationContext context;
+
+    @MockBean
+    private UserRepository userRepository;
+
+    private WebTestClient webTestClient;
+
+    @Before
+    public void setUp() {
+
+        webTestClient = WebTestClient.bindToApplicationContext(context).build();
+    }
+
+    @Test
+    public void testGetUserById() {
+
+        User user = User.builder().id(8).name("ABC").email("abc@xyz.com").build();
+        Mono<User> userMono = Mono.just(user);
+
+        when(userRepository.findById(8)).thenReturn(userMono);
+
+        webTestClient.get()
+                .uri("/users/8")
+                .accept(MediaType.APPLICATION_JSON)
+                .exchange()
+                .expectStatus().isOk()
+                .expectBody(User.class)
+                .value(userResponse -> {
+                            Assertions.assertThat(userResponse.getId()).isEqualTo(8);
+                            Assertions.assertThat(userResponse.getName()).isEqualTo("ABC");
+                            Assertions.assertThat(userResponse.getEmail()).isEqualTo("abc@xyz.com");
+                        }
+                );
+    }
+
+    @Test
+    public void testGetUsers() {
+
+        User user1 = User.builder().id(1).name("ABC").email("abc@xyz.com").build();
+        User user2 = User.builder().id(2).name("XYZ").email("xyz@abc.com").build();
+
+        when(userRepository.findAll()).thenReturn(Flux.just(user1, user2));
+
+        webTestClient.get()
+                .uri("/users")
+                .exchange()
+                .expectStatus().isOk()
+                .expectBodyList(User.class)
+                .value(userResponse -> {
+                            Assertions.assertThat(userResponse.get(0).getId()).isEqualTo(1);
+                            Assertions.assertThat(userResponse.get(0).getName()).isEqualTo("ABC");
+                            Assertions.assertThat(userResponse.get(0).getEmail()).isEqualTo("abc@xyz.com");
+                            Assertions.assertThat(userResponse.get(1).getId()).isEqualTo(2);
+                            Assertions.assertThat(userResponse.get(1).getName()).isEqualTo("XYZ");
+                            Assertions.assertThat(userResponse.get(1).getEmail()).isEqualTo("xyz@abc.com");
+                        }
+                );
+    }
+
+    @Test
+    public void testCreateUser() {
+
+        User user = User.builder().id(1).name("ABC").email("abc@xyz.com").build();
+        Mono<User> UserMono = Mono.just(user);
+        when(userRepository.save(any())).thenReturn(UserMono);
+
+        webTestClient.post()
+                .uri("/users")
+                .contentType(MediaType.APPLICATION_JSON)
+                .accept(MediaType.APPLICATION_JSON)
+                .body(Mono.just(user), User.class)
+                .exchange()
+                .expectStatus().isOk()
+                .expectBody(User.class)
+                .value(userResponse -> {
+                            Assertions.assertThat(userResponse.getId()).isEqualTo(1);
+                            Assertions.assertThat(userResponse.getName()).isEqualTo("ABC");
+                            Assertions.assertThat(userResponse.getEmail()).isEqualTo("abc@xyz.com");
+                        }
+                );
+    }
+
+    @Test
+    public void testUpdateUser() {
+
+        User user = User.builder().id(1).name("ABC").email("abc@xyz.com").build();
+        Mono<User> UserMono = Mono.just(user);
+        when(userRepository.save(any())).thenReturn(UserMono);
+
+        webTestClient.put()
+                .uri("/users/updateuser/2")
+                .contentType(MediaType.APPLICATION_JSON)
+                .accept(MediaType.APPLICATION_JSON)
+                .body(Mono.just(user), User.class)
+                .exchange()
+                .expectStatus().isOk()
+                .expectBody(User.class)
+                .value(userResponse -> {
+                            Assertions.assertThat(userResponse.getId()).isEqualTo(1);
+                            Assertions.assertThat(userResponse.getName()).isEqualTo("ABC");
+                            Assertions.assertThat(userResponse.getEmail()).isEqualTo("abc@xyz.com");
+                        }
+                );
+    }
+
+    @Test
+    public void testDeleteUser() {
+
+        User user = User.builder().id(1).name("ABC").email("abc@xyz.com").build();
+        Mono<User> UserMono = Mono.just(user);
+        when(userRepository.save(any())).thenReturn(UserMono);
+
+        webTestClient.delete()
+                .uri("/users/deleteuser/1")
+                .exchange()
+                .expectStatus().isOk();
+               /* .expectBody(User.class)
+                .value(userResponse -> {
+                            Assertions.assertThat(userResponse.getId()).isEqualTo(1);
+                            Assertions.assertThat(userResponse.getName()).isEqualTo("ABC");
+                            Assertions.assertThat(userResponse.getEmail()).isEqualTo("abc@xyz.com");
+                        }
+                );*/
+    }
+
+}

user-service/src/test/java/com/nisum/ecommerce/oms/controller/TestUserHandlerIntegration.java

+package com.nisum.ecommerce.oms.controller;
+
+import com.nisum.ecommerce.oms.model.User;
+import com.nisum.ecommerce.oms.repository.UserRepository;
+import org.assertj.core.api.Assertions;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.http.MediaType;
+import org.springframework.test.context.junit4.SpringRunner;
+import org.springframework.test.web.reactive.server.FluxExchangeResult;
+import org.springframework.test.web.reactive.server.WebTestClient;
+import reactor.core.publisher.Mono;
+import reactor.test.StepVerifier;
+import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
+
+import java.util.Collections;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest(webEnvironment = WebEnvironment.RANDOM_PORT)
+public class TestUserHandlerIntegration {
+
+    @Autowired
+    private WebTestClient webTestClient;
+
+    @Autowired
+    private UserRepository userRepository;
+
+    @Test
+    public void testCreateUserSuccess() {
+
+        User user = User.builder().id(6).name("Chandra").email("Chandra@gmail.com").build();
+
+        webTestClient.post().uri("/users")
+                .contentType(MediaType.APPLICATION_JSON)
+                .accept(MediaType.APPLICATION_JSON)
+                .body(Mono.just(user), User.class)
+                .exchange()
+                .expectStatus().isOk()
+                .expectHeader().contentType(MediaType.APPLICATION_JSON)
+                .expectBody()
+                .jsonPath("$.id").isNotEmpty()
+                .jsonPath("$.name").isEqualTo("Chandra")
+                .jsonPath("$.email").isEqualTo("Chandra@gmail.com");
+    }
+
+    @Test
+    public void testCreateUserFailure() {
+
+        User user = User.builder().id(6).name("Nisum").email("NisumTech@nisum.com").build();
+
+        webTestClient.post().uri("/users")
+                .contentType(MediaType.APPLICATION_JSON)
+                .accept(MediaType.APPLICATION_JSON)
+                .body(Mono.just(user), User.class)
+                .exchange()
+                .expectStatus().isOk()
+                .expectHeader().contentType(MediaType.APPLICATION_JSON)
+                .expectBody()
+                .jsonPath("$.id").isNotEmpty()
+                .jsonPath("$.name").isEqualTo("Technologies")
+                 .jsonPath("$.email").isEqualTo("Technologies@nisum.com");
+    }
+
+    @Test
+    public void getUserByIdSuccessTest() {
+
+        User user = userRepository.save(new User(1,"Hello, World!", "test@gmail.com")).block();
+
+        webTestClient.get()
+                .uri("/users/{id}", Collections.singletonMap("id", user.getId()))
+                .exchange()
+                .expectStatus().isOk()
+                .expectBody()
+                .consumeWith(response ->
+                        Assertions.assertThat(response.getResponseBody()).isNotNull());
+    }
+
+    @Test
+    public void getUserByIdErrorTest() {
+
+        User user = userRepository.save(new User(12,"Hello, World!", "test@gmail.com")).block();
+
+        webTestClient.get()
+                .uri("/users/{id}", Collections.singletonMap("id", user.getName()))
+                .exchange()
+                .expectStatus().isOk()
+                .expectBody()
+                .consumeWith(response ->
+                        Assertions.assertThat(response.getResponseBody()).isNotNull());
+    }
+
+    @Test
+    public void getAllUsersTest() {
+
+        webTestClient.get().uri("/users")
+                .accept(MediaType.APPLICATION_JSON)
+                .exchange()
+                .expectStatus().isOk()
+                .expectHeader().contentType(MediaType.APPLICATION_JSON)
+                .expectBodyList(User.class);
+
+
+
+        /*this.webTestClient.get().uri("/users").exchange().expectStatus().isOk()
+                .expectBody(String.class)
+                .isEqualTo("Hello, World!");*/
+
+        /*this.webTestClient.get().uri("/users")
+                 .accept(MediaType.APPLICATION_JSON)
+                .exchange()
+                .expectStatus().isOk()
+                //.expectHeader().contentType(MediaType.APPLICATION_JSON)
+                .expectBody(String.class)
+                .isEqualTo("Hendi");
+*/
+
+        /*webTestClient.post().uri("/users")
+                .contentType(MediaType.APPLICATION_JSON)
+                .accept(MediaType.APPLICATION_JSON)
+                .body(Mono.just(User.builder().name("This is a Test Tweet").build()), User.class)
+                .exchange()
+                .expectStatus().isOk()
+                .expectHeader().contentType(MediaType.APPLICATION_JSON)
+                .expectBody()
+                .jsonPath("$.id").isNotEmpty()
+                .jsonPath("$.text").isEqualTo("This is a Test Tweet");*/
+
+
+/*
+        FluxExchangeResult<User> result = this.webTestClient.get()
+                .uri("/users")
+                .accept(MediaType.APPLICATION_JSON)
+                .exchange()
+                .expectStatus().isOk()
+                .returnResult(User.class);;
+                //.expectBody(String.class).isEqualTo("Hendi");
+
+        Flux<User> eventFlux = result.getResponseBody();
+
+        StepVerifier.create(eventFlux)
+                .expectNextCount(10)
+                .thenCancel()
+                .verify();
+*/
+    }
+
+    @Test
+    public void testUpdateUser() {
+
+        User user = userRepository.save(User.builder().id(1).name("Hendi").email("Santika@gmail.com").build()).block();
+
+       User newUserData = User.builder().id(1).name("Prasad Updated").email("PrasadUpdated@gmail.com").build();
+
+        webTestClient.put()
+                .uri("/users/updateuser/{id}", Collections.singletonMap("id", user.getId()))
+                .contentType(MediaType.APPLICATION_JSON)
+                .accept(MediaType.APPLICATION_JSON)
+                .body(Mono.just(newUserData), User.class)
+                .exchange()
+                .expectStatus().isOk()
+                .expectHeader().contentType(MediaType.APPLICATION_JSON)
+                .expectBody()
+                .jsonPath("$.name").isEqualTo("Prasad Updated");
+    }
+
+    @Test
+    public void testDeleteUser() {
+
+        User user = userRepository.save(User.builder().id(1).name("Hendi").email("Santika@gmail.com").build()).block();
+
+        webTestClient.delete()
+                .uri("/users/deleteuser/{id}", Collections.singletonMap("id",  user.getId()))
+                .exchange()
+                .expectStatus().isOk();
+    }
+
+}