Getting started with Spring webflux (#155)

* spring webflux basic implementation * Update application.yml Co-authored-by: Arpendu Kumar Garai <Arpendu.KumarGarai@microfocus.com>
2022-03-10 01:15:26 +05:30
parent c593aae6e1
commit 02c73d52f3
18 changed files with 1021 additions and 0 deletions
--- a/spring-webflux/.gitignore
+++ b/spring-webflux/.gitignore
@@ -0,0 +1,33 @@
+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/
--- a/spring-webflux/.mvn/wrapper/maven-wrapper.jar
+++ b/spring-webflux/.mvn/wrapper/maven-wrapper.jar
--- a/spring-webflux/.mvn/wrapper/maven-wrapper.properties
+++ b/spring-webflux/.mvn/wrapper/maven-wrapper.properties
@@ -0,0 +1,2 @@
+distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.8.4/apache-maven-3.8.4-bin.zip
+wrapperUrl=https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.1.0/maven-wrapper-3.1.0.jar
--- a/spring-webflux/README.md
+++ b/spring-webflux/README.md
@@ -0,0 +1,4 @@
+# Related Blog Posts
+
+* [Getting Started with Spring WebFlux](https://reflectoring.io/getting-started-with-spring-webflux/)
+
--- a/spring-webflux/mvnw
+++ b/spring-webflux/mvnw
@@ -0,0 +1,316 @@
+#!/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
+#
+#    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.
+# ----------------------------------------------------------------------------
+
+# ----------------------------------------------------------------------------
+# Maven Start Up Batch script
+#
+# Required ENV vars:
+# ------------------
+#   JAVA_HOME - location of a JDK home dir
+#
+# Optional ENV vars
+# -----------------
+#   M2_HOME - location of maven2's installed home dir
+#   MAVEN_OPTS - parameters passed to the Java VM when running Maven
+#     e.g. to debug Maven itself, use
+#       set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000
+#   MAVEN_SKIP_RC - flag to disable loading of mavenrc files
+# ----------------------------------------------------------------------------
+
+if [ -z "$MAVEN_SKIP_RC" ] ; then
+
+  if [ -f /usr/local/etc/mavenrc ] ; then
+    . /usr/local/etc/mavenrc
+  fi
+
+  if [ -f /etc/mavenrc ] ; then
+    . /etc/mavenrc
+  fi
+
+  if [ -f "$HOME/.mavenrc" ] ; then
+    . "$HOME/.mavenrc"
+  fi
+
+fi
+
+# OS specific support.  $var _must_ be set to either true or false.
+cygwin=false;
+darwin=false;
+mingw=false
+case "`uname`" in
+  CYGWIN*) cygwin=true ;;
+  MINGW*) mingw=true;;
+  Darwin*) darwin=true
+    # Use /usr/libexec/java_home if available, otherwise fall back to /Library/Java/Home
+    # See https://developer.apple.com/library/mac/qa/qa1170/_index.html
+    if [ -z "$JAVA_HOME" ]; then
+      if [ -x "/usr/libexec/java_home" ]; then
+        export JAVA_HOME="`/usr/libexec/java_home`"
+      else
+        export JAVA_HOME="/Library/Java/Home"
+      fi
+    fi
+    ;;
+esac
+
+if [ -z "$JAVA_HOME" ] ; then
+  if [ -r /etc/gentoo-release ] ; then
+    JAVA_HOME=`java-config --jre-home`
+  fi
+fi
+
+if [ -z "$M2_HOME" ] ; then
+  ## resolve links - $0 may be a link to maven's home
+  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"`/$link"
+    fi
+  done
+
+  saveddir=`pwd`
+
+  M2_HOME=`dirname "$PRG"`/..
+
+  # make it fully qualified
+  M2_HOME=`cd "$M2_HOME" && pwd`
+
+  cd "$saveddir"
+  # echo Using m2 at $M2_HOME
+fi
+
+# For Cygwin, ensure paths are in UNIX format before anything is touched
+if $cygwin ; then
+  [ -n "$M2_HOME" ] &&
+    M2_HOME=`cygpath --unix "$M2_HOME"`
+  [ -n "$JAVA_HOME" ] &&
+    JAVA_HOME=`cygpath --unix "$JAVA_HOME"`
+  [ -n "$CLASSPATH" ] &&
+    CLASSPATH=`cygpath --path --unix "$CLASSPATH"`
+fi
+
+# For Mingw, ensure paths are in UNIX format before anything is touched
+if $mingw ; then
+  [ -n "$M2_HOME" ] &&
+    M2_HOME="`(cd "$M2_HOME"; pwd)`"
+  [ -n "$JAVA_HOME" ] &&
+    JAVA_HOME="`(cd "$JAVA_HOME"; pwd)`"
+fi
+
+if [ -z "$JAVA_HOME" ]; then
+  javaExecutable="`which javac`"
+  if [ -n "$javaExecutable" ] && ! [ "`expr \"$javaExecutable\" : '\([^ ]*\)'`" = "no" ]; then
+    # readlink(1) is not available as standard on Solaris 10.
+    readLink=`which readlink`
+    if [ ! `expr "$readLink" : '\([^ ]*\)'` = "no" ]; then
+      if $darwin ; then
+        javaHome="`dirname \"$javaExecutable\"`"
+        javaExecutable="`cd \"$javaHome\" && pwd -P`/javac"
+      else
+        javaExecutable="`readlink -f \"$javaExecutable\"`"
+      fi
+      javaHome="`dirname \"$javaExecutable\"`"
+      javaHome=`expr "$javaHome" : '\(.*\)/bin'`
+      JAVA_HOME="$javaHome"
+      export JAVA_HOME
+    fi
+  fi
+fi
+
+if [ -z "$JAVACMD" ] ; then
+  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
+  else
+    JAVACMD="`\\unset -f command; \\command -v java`"
+  fi
+fi
+
+if [ ! -x "$JAVACMD" ] ; then
+  echo "Error: JAVA_HOME is not defined correctly." >&2
+  echo "  We cannot execute $JAVACMD" >&2
+  exit 1
+fi
+
+if [ -z "$JAVA_HOME" ] ; then
+  echo "Warning: JAVA_HOME environment variable is not set."
+fi
+
+CLASSWORLDS_LAUNCHER=org.codehaus.plexus.classworlds.launcher.Launcher
+
+# traverses directory structure from process work directory to filesystem root
+# first directory with .mvn subdirectory is considered project base directory
+find_maven_basedir() {
+
+  if [ -z "$1" ]
+  then
+    echo "Path not specified to find_maven_basedir"
+    return 1
+  fi
+
+  basedir="$1"
+  wdir="$1"
+  while [ "$wdir" != '/' ] ; do
+    if [ -d "$wdir"/.mvn ] ; then
+      basedir=$wdir
+      break
+    fi
+    # workaround for JBEAP-8937 (on Solaris 10/Sparc)
+    if [ -d "${wdir}" ]; then
+      wdir=`cd "$wdir/.."; pwd`
+    fi
+    # end of workaround
+  done
+  echo "${basedir}"
+}
+
+# concatenates all lines of a file
+concat_lines() {
+  if [ -f "$1" ]; then
+    echo "$(tr -s '\n' ' ' < "$1")"
+  fi
+}
+
+BASE_DIR=`find_maven_basedir "$(pwd)"`
+if [ -z "$BASE_DIR" ]; then
+  exit 1;
+fi
+
+##########################################################################################
+# Extension to allow automatically downloading the maven-wrapper.jar from Maven-central
+# This allows using the maven wrapper in projects that prohibit checking in binary data.
+##########################################################################################
+if [ -r "$BASE_DIR/.mvn/wrapper/maven-wrapper.jar" ]; then
+    if [ "$MVNW_VERBOSE" = true ]; then
+      echo "Found .mvn/wrapper/maven-wrapper.jar"
+    fi
+else
+    if [ "$MVNW_VERBOSE" = true ]; then
+      echo "Couldn't find .mvn/wrapper/maven-wrapper.jar, downloading it ..."
+    fi
+    if [ -n "$MVNW_REPOURL" ]; then
+      jarUrl="$MVNW_REPOURL/org/apache/maven/wrapper/maven-wrapper/3.1.0/maven-wrapper-3.1.0.jar"
+    else
+      jarUrl="https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.1.0/maven-wrapper-3.1.0.jar"
+    fi
+    while IFS="=" read key value; do
+      case "$key" in (wrapperUrl) jarUrl="$value"; break ;;
+      esac
+    done < "$BASE_DIR/.mvn/wrapper/maven-wrapper.properties"
+    if [ "$MVNW_VERBOSE" = true ]; then
+      echo "Downloading from: $jarUrl"
+    fi
+    wrapperJarPath="$BASE_DIR/.mvn/wrapper/maven-wrapper.jar"
+    if $cygwin; then
+      wrapperJarPath=`cygpath --path --windows "$wrapperJarPath"`
+    fi
+
+    if command -v wget > /dev/null; then
+        if [ "$MVNW_VERBOSE" = true ]; then
+          echo "Found wget ... using wget"
+        fi
+        if [ -z "$MVNW_USERNAME" ] || [ -z "$MVNW_PASSWORD" ]; then
+            wget "$jarUrl" -O "$wrapperJarPath" || rm -f "$wrapperJarPath"
+        else
+            wget --http-user=$MVNW_USERNAME --http-password=$MVNW_PASSWORD "$jarUrl" -O "$wrapperJarPath" || rm -f "$wrapperJarPath"
+        fi
+    elif command -v curl > /dev/null; then
+        if [ "$MVNW_VERBOSE" = true ]; then
+          echo "Found curl ... using curl"
+        fi
+        if [ -z "$MVNW_USERNAME" ] || [ -z "$MVNW_PASSWORD" ]; then
+            curl -o "$wrapperJarPath" "$jarUrl" -f
+        else
+            curl --user $MVNW_USERNAME:$MVNW_PASSWORD -o "$wrapperJarPath" "$jarUrl" -f
+        fi
+
+    else
+        if [ "$MVNW_VERBOSE" = true ]; then
+          echo "Falling back to using Java to download"
+        fi
+        javaClass="$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.java"
+        # For Cygwin, switch paths to Windows format before running javac
+        if $cygwin; then
+          javaClass=`cygpath --path --windows "$javaClass"`
+        fi
+        if [ -e "$javaClass" ]; then
+            if [ ! -e "$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.class" ]; then
+                if [ "$MVNW_VERBOSE" = true ]; then
+                  echo " - Compiling MavenWrapperDownloader.java ..."
+                fi
+                # Compiling the Java class
+                ("$JAVA_HOME/bin/javac" "$javaClass")
+            fi
+            if [ -e "$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.class" ]; then
+                # Running the downloader
+                if [ "$MVNW_VERBOSE" = true ]; then
+                  echo " - Running MavenWrapperDownloader.java ..."
+                fi
+                ("$JAVA_HOME/bin/java" -cp .mvn/wrapper MavenWrapperDownloader "$MAVEN_PROJECTBASEDIR")
+            fi
+        fi
+    fi
+fi
+##########################################################################################
+# End of extension
+##########################################################################################
+
+export MAVEN_PROJECTBASEDIR=${MAVEN_BASEDIR:-"$BASE_DIR"}
+if [ "$MVNW_VERBOSE" = true ]; then
+  echo $MAVEN_PROJECTBASEDIR
+fi
+MAVEN_OPTS="$(concat_lines "$MAVEN_PROJECTBASEDIR/.mvn/jvm.config") $MAVEN_OPTS"
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin; then
+  [ -n "$M2_HOME" ] &&
+    M2_HOME=`cygpath --path --windows "$M2_HOME"`
+  [ -n "$JAVA_HOME" ] &&
+    JAVA_HOME=`cygpath --path --windows "$JAVA_HOME"`
+  [ -n "$CLASSPATH" ] &&
+    CLASSPATH=`cygpath --path --windows "$CLASSPATH"`
+  [ -n "$MAVEN_PROJECTBASEDIR" ] &&
+    MAVEN_PROJECTBASEDIR=`cygpath --path --windows "$MAVEN_PROJECTBASEDIR"`
+fi
+
+# Provide a "standardized" way to retrieve the CLI args that will
+# work with both Windows and non-Windows executions.
+MAVEN_CMD_LINE_ARGS="$MAVEN_CONFIG $@"
+export MAVEN_CMD_LINE_ARGS
+
+WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain
+
+exec "$JAVACMD" \
+  $MAVEN_OPTS \
+  $MAVEN_DEBUG_OPTS \
+  -classpath "$MAVEN_PROJECTBASEDIR/.mvn/wrapper/maven-wrapper.jar" \
+  "-Dmaven.home=${M2_HOME}" \
+  "-Dmaven.multiModuleProjectDirectory=${MAVEN_PROJECTBASEDIR}" \
+  ${WRAPPER_LAUNCHER} $MAVEN_CONFIG "$@"
--- a/spring-webflux/mvnw.cmd
+++ b/spring-webflux/mvnw.cmd
@@ -0,0 +1,188 @@
+@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    https://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 Maven Start Up Batch script
+@REM
+@REM Required ENV vars:
+@REM JAVA_HOME - location of a JDK home dir
+@REM
+@REM Optional ENV vars
+@REM M2_HOME - location of maven2's installed home dir
+@REM MAVEN_BATCH_ECHO - set to 'on' to enable the echoing of the batch commands
+@REM MAVEN_BATCH_PAUSE - set to 'on' to wait for a keystroke before ending
+@REM MAVEN_OPTS - parameters passed to the Java VM when running Maven
+@REM     e.g. to debug Maven itself, use
+@REM set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000
+@REM MAVEN_SKIP_RC - flag to disable loading of mavenrc files
+@REM ----------------------------------------------------------------------------
+
+@REM Begin all REM lines with '@' in case MAVEN_BATCH_ECHO is 'on'
+@echo off
+@REM set title of command window
+title %0
+@REM enable echoing by setting MAVEN_BATCH_ECHO to 'on'
+@if "%MAVEN_BATCH_ECHO%" == "on"  echo %MAVEN_BATCH_ECHO%
+
+@REM set %HOME% to equivalent of $HOME
+if "%HOME%" == "" (set "HOME=%HOMEDRIVE%%HOMEPATH%")
+
+@REM Execute a user defined script before this one
+if not "%MAVEN_SKIP_RC%" == "" goto skipRcPre
+@REM check for pre script, once with legacy .bat ending and once with .cmd ending
+if exist "%USERPROFILE%\mavenrc_pre.bat" call "%USERPROFILE%\mavenrc_pre.bat" %*
+if exist "%USERPROFILE%\mavenrc_pre.cmd" call "%USERPROFILE%\mavenrc_pre.cmd" %*
+:skipRcPre
+
+@setlocal
+
+set ERROR_CODE=0
+
+@REM To isolate internal variables from possible post scripts, we use another setlocal
+@setlocal
+
+@REM ==== START VALIDATION ====
+if not "%JAVA_HOME%" == "" goto OkJHome
+
+echo.
+echo Error: JAVA_HOME not found in your environment. >&2
+echo Please set the JAVA_HOME variable in your environment to match the >&2
+echo location of your Java installation. >&2
+echo.
+goto error
+
+:OkJHome
+if exist "%JAVA_HOME%\bin\java.exe" goto init
+
+echo.
+echo Error: JAVA_HOME is set to an invalid directory. >&2
+echo JAVA_HOME = "%JAVA_HOME%" >&2
+echo Please set the JAVA_HOME variable in your environment to match the >&2
+echo location of your Java installation. >&2
+echo.
+goto error
+
+@REM ==== END VALIDATION ====
+
+:init
+
+@REM Find the project base dir, i.e. the directory that contains the folder ".mvn".
+@REM Fallback to current working directory if not found.
+
+set MAVEN_PROJECTBASEDIR=%MAVEN_BASEDIR%
+IF NOT "%MAVEN_PROJECTBASEDIR%"=="" goto endDetectBaseDir
+
+set EXEC_DIR=%CD%
+set WDIR=%EXEC_DIR%
+:findBaseDir
+IF EXIST "%WDIR%"\.mvn goto baseDirFound
+cd ..
+IF "%WDIR%"=="%CD%" goto baseDirNotFound
+set WDIR=%CD%
+goto findBaseDir
+
+:baseDirFound
+set MAVEN_PROJECTBASEDIR=%WDIR%
+cd "%EXEC_DIR%"
+goto endDetectBaseDir
+
+:baseDirNotFound
+set MAVEN_PROJECTBASEDIR=%EXEC_DIR%
+cd "%EXEC_DIR%"
+
+:endDetectBaseDir
+
+IF NOT EXIST "%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config" goto endReadAdditionalConfig
+
+@setlocal EnableExtensions EnableDelayedExpansion
+for /F "usebackq delims=" %%a in ("%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config") do set JVM_CONFIG_MAVEN_PROPS=!JVM_CONFIG_MAVEN_PROPS! %%a
+@endlocal & set JVM_CONFIG_MAVEN_PROPS=%JVM_CONFIG_MAVEN_PROPS%
+
+:endReadAdditionalConfig
+
+SET MAVEN_JAVA_EXE="%JAVA_HOME%\bin\java.exe"
+set WRAPPER_JAR="%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.jar"
+set WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain
+
+set DOWNLOAD_URL="https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.1.0/maven-wrapper-3.1.0.jar"
+
+FOR /F "usebackq tokens=1,2 delims==" %%A IN ("%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.properties") DO (
+    IF "%%A"=="wrapperUrl" SET DOWNLOAD_URL=%%B
+)
+
+@REM Extension to allow automatically downloading the maven-wrapper.jar from Maven-central
+@REM This allows using the maven wrapper in projects that prohibit checking in binary data.
+if exist %WRAPPER_JAR% (
+    if "%MVNW_VERBOSE%" == "true" (
+        echo Found %WRAPPER_JAR%
+    )
+) else (
+    if not "%MVNW_REPOURL%" == "" (
+        SET DOWNLOAD_URL="%MVNW_REPOURL%/org/apache/maven/wrapper/maven-wrapper/3.1.0/maven-wrapper-3.1.0.jar"
+    )
+    if "%MVNW_VERBOSE%" == "true" (
+        echo Couldn't find %WRAPPER_JAR%, downloading it ...
+        echo Downloading from: %DOWNLOAD_URL%
+    )
+
+    powershell -Command "&{"^
+		"$webclient = new-object System.Net.WebClient;"^
+		"if (-not ([string]::IsNullOrEmpty('%MVNW_USERNAME%') -and [string]::IsNullOrEmpty('%MVNW_PASSWORD%'))) {"^
+		"$webclient.Credentials = new-object System.Net.NetworkCredential('%MVNW_USERNAME%', '%MVNW_PASSWORD%');"^
+		"}"^
+		"[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12; $webclient.DownloadFile('%DOWNLOAD_URL%', '%WRAPPER_JAR%')"^
+		"}"
+    if "%MVNW_VERBOSE%" == "true" (
+        echo Finished downloading %WRAPPER_JAR%
+    )
+)
+@REM End of extension
+
+@REM Provide a "standardized" way to retrieve the CLI args that will
+@REM work with both Windows and non-Windows executions.
+set MAVEN_CMD_LINE_ARGS=%*
+
+%MAVEN_JAVA_EXE% ^
+  %JVM_CONFIG_MAVEN_PROPS% ^
+  %MAVEN_OPTS% ^
+  %MAVEN_DEBUG_OPTS% ^
+  -classpath %WRAPPER_JAR% ^
+  "-Dmaven.multiModuleProjectDirectory=%MAVEN_PROJECTBASEDIR%" ^
+  %WRAPPER_LAUNCHER% %MAVEN_CONFIG% %*
+if ERRORLEVEL 1 goto error
+goto end
+
+:error
+set ERROR_CODE=1
+
+:end
+@endlocal & set ERROR_CODE=%ERROR_CODE%
+
+if not "%MAVEN_SKIP_RC%"=="" goto skipRcPost
+@REM check for post script, once with legacy .bat ending and once with .cmd ending
+if exist "%USERPROFILE%\mavenrc_post.bat" call "%USERPROFILE%\mavenrc_post.bat"
+if exist "%USERPROFILE%\mavenrc_post.cmd" call "%USERPROFILE%\mavenrc_post.cmd"
+:skipRcPost
+
+@REM pause the script if MAVEN_BATCH_PAUSE is set to 'on'
+if "%MAVEN_BATCH_PAUSE%"=="on" pause
+
+if "%MAVEN_TERMINATE_CMD%"=="on" exit %ERROR_CODE%
+
+cmd /C exit /B %ERROR_CODE%
--- a/spring-webflux/pom.xml
+++ b/spring-webflux/pom.xml
@@ -0,0 +1,69 @@
+<?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>2.6.3</version>
+		<relativePath/> <!-- lookup parent from repository -->
+	</parent>
+	<groupId>io.reflectoring</groupId>
+	<artifactId>spring-webflux</artifactId>
+	<version>0.0.1-SNAPSHOT</version>
+	<name>spring-webflux</name>
+	<description>Getting Started with Spring Webflux</description>
+	<properties>
+		<java.version>1.8</java.version>
+	</properties>
+	<dependencies>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-data-mongodb-reactive</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-webflux</artifactId>
+		</dependency>
+
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-devtools</artifactId>
+			<scope>runtime</scope>
+			<optional>true</optional>
+		</dependency>
+		<dependency>
+			<groupId>org.projectlombok</groupId>
+			<artifactId>lombok</artifactId>
+			<optional>true</optional>
+		</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>
+	</dependencies>
+
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.springframework.boot</groupId>
+				<artifactId>spring-boot-maven-plugin</artifactId>
+				<configuration>
+					<excludes>
+						<exclude>
+							<groupId>org.projectlombok</groupId>
+							<artifactId>lombok</artifactId>
+						</exclude>
+					</excludes>
+				</configuration>
+			</plugin>
+		</plugins>
+	</build>
+
+</project>
--- a/spring-webflux/src/main/java/io/reflectoring/springwebflux/SpringWebfluxApplication.java
+++ b/spring-webflux/src/main/java/io/reflectoring/springwebflux/SpringWebfluxApplication.java
@@ -0,0 +1,15 @@
+package io.reflectoring.springwebflux;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.data.mongodb.config.EnableMongoAuditing;
+import org.springframework.data.mongodb.repository.config.EnableReactiveMongoRepositories;
+
+@EnableMongoAuditing
+@EnableReactiveMongoRepositories
+@SpringBootApplication
+public class SpringWebfluxApplication {
+	public static void main(String[] args) {
+		SpringApplication.run(SpringWebfluxApplication.class, args);
+	}
+}
--- a/spring-webflux/src/main/java/io/reflectoring/springwebflux/client/WebClientUtil.java
+++ b/spring-webflux/src/main/java/io/reflectoring/springwebflux/client/WebClientUtil.java
@@ -0,0 +1,43 @@
+package io.reflectoring.springwebflux.client;
+
+import io.reflectoring.springwebflux.model.User;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.http.MediaType;
+import org.springframework.stereotype.Component;
+import org.springframework.web.reactive.function.client.WebClient;
+import reactor.core.publisher.Mono;
+import reactor.util.retry.Retry;
+
+import java.time.Duration;
+
+@Slf4j
+@Component
+@RequiredArgsConstructor
+public class WebClientUtil {
+
+    private final WebClient webClient;
+
+    public WebClient.ResponseSpec getFakeUsers() {
+        return webClient
+                .get()
+                .uri("https://randomuser.me/api/")
+                .retrieve();
+    }
+
+    public Mono<User> postUser(User user) {
+        return webClient
+                .post()
+                .uri("http://localhost:9000/api/users")
+                .header("Authorization", "Basic MY_PASSWORD")
+                .accept(MediaType.APPLICATION_JSON)
+                .body(Mono.just(user), User.class)
+                .retrieve()
+                .bodyToMono(User.class)
+                .log()
+                .retryWhen(Retry.backoff(10, Duration.ofSeconds(2)))
+                .onErrorReturn(new User())
+                .doOnError(throwable -> log.error("Result error out for POST user", throwable))
+                .doFinally(signalType -> log.info("Result Completed for POST User: {}", signalType));
+    }
+}
--- a/spring-webflux/src/main/java/io/reflectoring/springwebflux/config/RouterConfig.java
+++ b/spring-webflux/src/main/java/io/reflectoring/springwebflux/config/RouterConfig.java
@@ -0,0 +1,24 @@
+package io.reflectoring.springwebflux.config;
+
+import io.reflectoring.springwebflux.handler.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.ServerResponse;
+
+import static org.springframework.web.reactive.function.server.RequestPredicates.*;
+import static org.springframework.web.reactive.function.server.RouterFunctions.route;
+
+@Configuration
+public class RouterConfig {
+
+    @Bean
+    RouterFunction<ServerResponse> routes(UserHandler handler) {
+        return route(GET("/handler/users").and(accept(MediaType.APPLICATION_JSON)), handler::getAllUsers)
+                .andRoute(GET("/handler/users/{userId}").and(contentType(MediaType.APPLICATION_JSON)), handler::getUserById)
+                .andRoute(POST("/handler/users").and(accept(MediaType.APPLICATION_JSON)), handler::create)
+                .andRoute(PUT("/handler/users/{userId}").and(contentType(MediaType.APPLICATION_JSON)), handler::updateUserById)
+                .andRoute(DELETE("/handler/users/{userId}").and(accept(MediaType.APPLICATION_JSON)), handler::deleteUserById);
+    }
+}
--- a/spring-webflux/src/main/java/io/reflectoring/springwebflux/config/WebclientConfig.java
+++ b/spring-webflux/src/main/java/io/reflectoring/springwebflux/config/WebclientConfig.java
@@ -0,0 +1,46 @@
+package io.reflectoring.springwebflux.config;
+
+import io.netty.channel.ChannelOption;
+import io.netty.handler.logging.LogLevel;
+import io.netty.handler.ssl.SslContext;
+import io.netty.handler.ssl.SslContextBuilder;
+import io.netty.handler.ssl.util.InsecureTrustManagerFactory;
+import io.netty.handler.timeout.ReadTimeoutHandler;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.http.client.reactive.ReactorClientHttpConnector;
+import org.springframework.web.reactive.function.client.ExchangeStrategies;
+import org.springframework.web.reactive.function.client.WebClient;
+import reactor.netty.http.client.HttpClient;
+import reactor.netty.transport.logging.AdvancedByteBufFormat;
+
+import javax.net.ssl.SSLException;
+import java.util.concurrent.TimeUnit;
+
+@Configuration
+public class WebclientConfig {
+
+    @Bean
+    public WebClient getWebClientBuilder() throws SSLException {
+
+        // Define SSLContext in order to connect to secure REST API network
+        SslContext sslContext = SslContextBuilder
+                .forClient()
+                .trustManager(InsecureTrustManagerFactory.INSTANCE)
+                .build();
+
+        // Create an HTTP Client. Overload with timeout config and LogLevel settings.
+        // Override the above SSLContext into the client
+        HttpClient httpClient = HttpClient.create()
+                .option(ChannelOption.CONNECT_TIMEOUT_MILLIS, 120 * 1000)
+                .doOnConnected(connection -> connection.addHandlerLast(new ReadTimeoutHandler(120 * 1000, TimeUnit.MILLISECONDS)))
+                .wiretap("reactor.netty.http.client.HttpClient", LogLevel.DEBUG, AdvancedByteBufFormat.TEXTUAL)
+                .followRedirect(true)
+                .secure(sslContextSpec -> sslContextSpec.sslContext(sslContext));
+
+        // Add the above connector to the WebClient instance
+        return WebClient.builder()
+                .clientConnector(new ReactorClientHttpConnector(httpClient))
+                .build();
+    }
+}
--- a/spring-webflux/src/main/java/io/reflectoring/springwebflux/controller/UserController.java
+++ b/spring-webflux/src/main/java/io/reflectoring/springwebflux/controller/UserController.java
@@ -0,0 +1,72 @@
+package io.reflectoring.springwebflux.controller;
+
+import io.reflectoring.springwebflux.model.User;
+import io.reflectoring.springwebflux.service.UserService;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+import reactor.core.publisher.Flux;
+import reactor.core.publisher.Mono;
+import reactor.util.function.Tuple2;
+
+import java.time.Duration;
+import java.util.stream.Stream;
+
+@RequiredArgsConstructor
+@RestController
+@RequestMapping("/users")
+public class UserController {
+
+    private final UserService userService;
+
+    @PostMapping
+    @ResponseStatus(HttpStatus.CREATED)
+    public Mono<User> create(@RequestBody User user){
+        return userService.createUser(user);
+    }
+
+    @GetMapping
+    public Flux<User> getAllUsers(){
+        return userService.getAllUsers();
+    }
+
+    @GetMapping("/{userId}")
+    public Mono<ResponseEntity<User>> getUserById(@PathVariable String userId){
+        Mono<User> user = userService.findById(userId);
+        return user.map(ResponseEntity::ok)
+                .defaultIfEmpty(ResponseEntity.notFound().build());
+    }
+
+    @PutMapping("/{userId}")
+    public Mono<ResponseEntity<User>> updateUserById(@PathVariable String userId, @RequestBody User user){
+        return userService.updateUser(userId,user)
+                .map(ResponseEntity::ok)
+                .defaultIfEmpty(ResponseEntity.badRequest().build());
+    }
+
+    @DeleteMapping("/{userId}")
+    public Mono<ResponseEntity<Void>> deleteUserById(@PathVariable String userId){
+        return userService.deleteUser(userId)
+                .map( r -> ResponseEntity.ok().<Void>build())
+                .defaultIfEmpty(ResponseEntity.notFound().build());
+    }
+
+    @GetMapping("/search")
+    public Flux<User> searchUsers(@RequestParam("name") String name) {
+        return userService.fetchUsers(name);
+    }
+
+    @GetMapping(value = "/stream", produces = MediaType.TEXT_EVENT_STREAM_VALUE)
+    public Flux<User> streamAllUsers() {
+        return userService
+                .getAllUsers()
+                .flatMap(user -> Flux
+                        .zip(Flux.interval(Duration.ofSeconds(2)),
+                                Flux.fromStream(Stream.generate(() -> user))
+                        )
+                        .map(Tuple2::getT2)
+                );
+    }
+}
--- a/spring-webflux/src/main/java/io/reflectoring/springwebflux/handler/UserHandler.java
+++ b/spring-webflux/src/main/java/io/reflectoring/springwebflux/handler/UserHandler.java
@@ -0,0 +1,65 @@
+package io.reflectoring.springwebflux.handler;
+
+import io.reflectoring.springwebflux.model.User;
+import io.reflectoring.springwebflux.service.UserService;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
+import org.springframework.stereotype.Component;
+import org.springframework.web.reactive.function.server.ServerRequest;
+import org.springframework.web.reactive.function.server.ServerResponse;
+import reactor.core.publisher.Mono;
+
+@Component
+@RequiredArgsConstructor
+public class UserHandler {
+
+    private final UserService userService;
+
+    public Mono<ServerResponse> getAllUsers(ServerRequest request) {
+        return ServerResponse
+                .ok()
+                .contentType(MediaType.APPLICATION_JSON)
+                .body(userService.getAllUsers(), User.class);
+    }
+
+    public Mono<ServerResponse> getUserById(ServerRequest request) {
+        return userService
+                .findById(request.pathVariable("userId"))
+                .flatMap(user -> ServerResponse
+                        .ok()
+                        .contentType(MediaType.APPLICATION_JSON)
+                        .body(user, User.class)
+                )
+                .switchIfEmpty(ServerResponse.notFound().build());
+    }
+
+    public Mono<ServerResponse> create(ServerRequest request) {
+        Mono<User> user = request.bodyToMono(User.class);
+
+        return user
+                .flatMap(u -> ServerResponse
+                        .status(HttpStatus.CREATED)
+                        .contentType(MediaType.APPLICATION_JSON)
+                        .body(userService.createUser(u), User.class)
+                );
+    }
+
+    public Mono<ServerResponse> updateUserById(ServerRequest request) {
+        String id = request.pathVariable("userId");
+        Mono<User> updatedUser = request.bodyToMono(User.class);
+
+        return updatedUser
+                .flatMap(u -> ServerResponse
+                        .ok()
+                        .contentType(MediaType.APPLICATION_JSON)
+                        .body(userService.updateUser(id, u), User.class)
+                );
+    }
+
+    public Mono<ServerResponse> deleteUserById(ServerRequest request){
+        return userService.deleteUser(request.pathVariable("userId"))
+                .flatMap(u -> ServerResponse.ok().body(u, User.class))
+                .switchIfEmpty(ServerResponse.notFound().build());
+    }
+}
--- a/spring-webflux/src/main/java/io/reflectoring/springwebflux/model/User.java
+++ b/spring-webflux/src/main/java/io/reflectoring/springwebflux/model/User.java
@@ -0,0 +1,21 @@
+package io.reflectoring.springwebflux.model;
+
+import lombok.*;
+import org.springframework.data.annotation.Id;
+import org.springframework.data.mongodb.core.mapping.Document;
+
+@ToString
+@EqualsAndHashCode(of = {"id","name","department"})
+@AllArgsConstructor
+@NoArgsConstructor
+@Data
+@Document(value = "users")
+public class User {
+
+    @Id
+    private String id;
+    private String name;
+    private int age;
+    private double salary;
+    private String department;
+}
--- a/spring-webflux/src/main/java/io/reflectoring/springwebflux/repository/UserRepository.java
+++ b/spring-webflux/src/main/java/io/reflectoring/springwebflux/repository/UserRepository.java
@@ -0,0 +1,9 @@
+package io.reflectoring.springwebflux.repository;
+
+import io.reflectoring.springwebflux.model.User;
+import org.springframework.data.mongodb.repository.ReactiveMongoRepository;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface UserRepository extends ReactiveMongoRepository<User, String> {
+}
--- a/spring-webflux/src/main/java/io/reflectoring/springwebflux/service/UserService.java
+++ b/spring-webflux/src/main/java/io/reflectoring/springwebflux/service/UserService.java
@@ -0,0 +1,70 @@
+package io.reflectoring.springwebflux.service;
+
+import io.reflectoring.springwebflux.model.User;
+import io.reflectoring.springwebflux.repository.UserRepository;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.data.domain.Sort;
+import org.springframework.data.mongodb.core.ReactiveMongoTemplate;
+import org.springframework.data.mongodb.core.query.Criteria;
+import org.springframework.data.mongodb.core.query.Query;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+import reactor.core.publisher.Flux;
+import reactor.core.publisher.Mono;
+import reactor.core.scheduler.Schedulers;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+
+@Service
+@Slf4j
+@RequiredArgsConstructor
+@Transactional
+public class UserService {
+
+    private final ReactiveMongoTemplate reactiveMongoTemplate;
+    private final UserRepository userRepository;
+
+    public Mono<User> createUser(User user){
+        return userRepository.save(user);
+    }
+
+    public Flux<User> getAllUsers(){
+        return userRepository.findAll();
+    }
+
+    public Mono<User> findById(String userId){
+        return userRepository.findById(userId);
+    }
+
+    public Mono<User> updateUser(String userId,  User user){
+        return userRepository.findById(userId)
+                .flatMap(dbUser -> {
+                    dbUser.setAge(user.getAge());
+                    dbUser.setSalary(user.getSalary());
+                    return userRepository.save(dbUser);
+                });
+    }
+
+    public Mono<User> deleteUser(String userId){
+        return userRepository.findById(userId)
+                .flatMap(existingUser -> userRepository.delete(existingUser)
+                        .then(Mono.just(existingUser)));
+    }
+
+    public Flux<User> fetchUsers(String name) {
+        Query query = new Query()
+                .with(Sort
+                        .by(Collections.singletonList(Sort.Order.asc("age")))
+                );
+        query.addCriteria(Criteria
+                .where("name")
+                .regex(name)
+        );
+
+        return reactiveMongoTemplate
+                .find(query, User.class);
+    }
+}
--- a/spring-webflux/src/main/resources/application.yml
+++ b/spring-webflux/src/main/resources/application.yml
@@ -0,0 +1,31 @@
+spring:
+  application:
+    name: spring-webflux-guide
+  webflux:
+    base-path: /api
+  data:
+    mongodb:
+      authentication-database: admin
+      uri: mongodb://localhost:27017/test
+      database: test
+
+server:
+  port: 9000
+  http2:
+    enabled: true
+
+logging:
+  level:
+    io:
+      reflectoring: DEBUG
+    org:
+      springframework:
+        web: INFO
+        data:
+          mongodb:
+            core:
+              ReactiveMongoTemplate: DEBUG
+    reactor:
+      netty:
+        http:
+          client: DEBUG
--- a/spring-webflux/src/test/java/io/reflectoring/springwebflux/SpringWebfluxApplicationTests.java
+++ b/spring-webflux/src/test/java/io/reflectoring/springwebflux/SpringWebfluxApplicationTests.java
@@ -0,0 +1,13 @@
+package io.reflectoring.springwebflux;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class SpringWebfluxApplicationTests {
+
+	@Test
+	void contextLoads() {
+	}
+
+}