├── .gitignore ├── HELP.md ├── mvnw ├── mvnw.cmd ├── pom.xml └── src ├── main ├── java │ └── com │ │ └── dailycodebuffer │ │ └── reactiveprogramming │ │ ├── ReactiveProgrammingTutorialApplication.java │ │ ├── domain │ │ ├── Book.java │ │ ├── BookInfo.java │ │ └── Review.java │ │ ├── exception │ │ └── BookException.java │ │ └── services │ │ ├── BookInfoService.java │ │ ├── BookService.java │ │ ├── FluxAndMonoServices.java │ │ └── ReviewService.java └── resources │ └── application.properties └── test └── java └── com └── dailycodebuffer └── reactiveprogramming ├── BackPressureTest.java ├── HotAndColdStreamsTest.java ├── ReactiveProgrammingTutorialApplicationTests.java └── services ├── BookServiceMockTest.java ├── BookServiceTest.java └── FluxAndMonoServicesTest.java /.gitignore: -------------------------------------------------------------------------------- 1 | # Compiled class file 2 | *.class 3 | 4 | # Log file 5 | *.log 6 | 7 | # BlueJ files 8 | *.ctxt 9 | 10 | # Mobile Tools for Java (J2ME) 11 | .mtj.tmp/ 12 | 13 | # Package Files # 14 | *.jar 15 | *.war 16 | *.nar 17 | *.ear 18 | *.zip 19 | *.tar.gz 20 | *.rar 21 | 22 | # virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml 23 | hs_err_pid* 24 | -------------------------------------------------------------------------------- /HELP.md: -------------------------------------------------------------------------------- 1 | # Getting Started 2 | 3 | ### Reference Documentation 4 | For further reference, please consider the following sections: 5 | 6 | * [Official Apache Maven documentation](https://maven.apache.org/guides/index.html) 7 | * [Spring Boot Maven Plugin Reference Guide](https://docs.spring.io/spring-boot/docs/2.5.2/maven-plugin/reference/html/) 8 | * [Create an OCI image](https://docs.spring.io/spring-boot/docs/2.5.2/maven-plugin/reference/html/#build-image) 9 | 10 | -------------------------------------------------------------------------------- /mvnw: -------------------------------------------------------------------------------- 1 | #!/bin/sh 2 | # ---------------------------------------------------------------------------- 3 | # Licensed to the Apache Software Foundation (ASF) under one 4 | # or more contributor license agreements. See the NOTICE file 5 | # distributed with this work for additional information 6 | # regarding copyright ownership. The ASF licenses this file 7 | # to you under the Apache License, Version 2.0 (the 8 | # "License"); you may not use this file except in compliance 9 | # with the License. You may obtain a copy of the License at 10 | # 11 | # https://www.apache.org/licenses/LICENSE-2.0 12 | # 13 | # Unless required by applicable law or agreed to in writing, 14 | # software distributed under the License is distributed on an 15 | # "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 16 | # KIND, either express or implied. See the License for the 17 | # specific language governing permissions and limitations 18 | # under the License. 19 | # ---------------------------------------------------------------------------- 20 | 21 | # ---------------------------------------------------------------------------- 22 | # Maven Start Up Batch script 23 | # 24 | # Required ENV vars: 25 | # ------------------ 26 | # JAVA_HOME - location of a JDK home dir 27 | # 28 | # Optional ENV vars 29 | # ----------------- 30 | # M2_HOME - location of maven2's installed home dir 31 | # MAVEN_OPTS - parameters passed to the Java VM when running Maven 32 | # e.g. to debug Maven itself, use 33 | # set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000 34 | # MAVEN_SKIP_RC - flag to disable loading of mavenrc files 35 | # ---------------------------------------------------------------------------- 36 | 37 | if [ -z "$MAVEN_SKIP_RC" ] ; then 38 | 39 | if [ -f /etc/mavenrc ] ; then 40 | . /etc/mavenrc 41 | fi 42 | 43 | if [ -f "$HOME/.mavenrc" ] ; then 44 | . "$HOME/.mavenrc" 45 | fi 46 | 47 | fi 48 | 49 | # OS specific support. $var _must_ be set to either true or false. 50 | cygwin=false; 51 | darwin=false; 52 | mingw=false 53 | case "`uname`" in 54 | CYGWIN*) cygwin=true ;; 55 | MINGW*) mingw=true;; 56 | Darwin*) darwin=true 57 | # Use /usr/libexec/java_home if available, otherwise fall back to /Library/Java/Home 58 | # See https://developer.apple.com/library/mac/qa/qa1170/_index.html 59 | if [ -z "$JAVA_HOME" ]; then 60 | if [ -x "/usr/libexec/java_home" ]; then 61 | export JAVA_HOME="`/usr/libexec/java_home`" 62 | else 63 | export JAVA_HOME="/Library/Java/Home" 64 | fi 65 | fi 66 | ;; 67 | esac 68 | 69 | if [ -z "$JAVA_HOME" ] ; then 70 | if [ -r /etc/gentoo-release ] ; then 71 | JAVA_HOME=`java-config --jre-home` 72 | fi 73 | fi 74 | 75 | if [ -z "$M2_HOME" ] ; then 76 | ## resolve links - $0 may be a link to maven's home 77 | PRG="$0" 78 | 79 | # need this for relative symlinks 80 | while [ -h "$PRG" ] ; do 81 | ls=`ls -ld "$PRG"` 82 | link=`expr "$ls" : '.*-> \(.*\)$'` 83 | if expr "$link" : '/.*' > /dev/null; then 84 | PRG="$link" 85 | else 86 | PRG="`dirname "$PRG"`/$link" 87 | fi 88 | done 89 | 90 | saveddir=`pwd` 91 | 92 | M2_HOME=`dirname "$PRG"`/.. 93 | 94 | # make it fully qualified 95 | M2_HOME=`cd "$M2_HOME" && pwd` 96 | 97 | cd "$saveddir" 98 | # echo Using m2 at $M2_HOME 99 | fi 100 | 101 | # For Cygwin, ensure paths are in UNIX format before anything is touched 102 | if $cygwin ; then 103 | [ -n "$M2_HOME" ] && 104 | M2_HOME=`cygpath --unix "$M2_HOME"` 105 | [ -n "$JAVA_HOME" ] && 106 | JAVA_HOME=`cygpath --unix "$JAVA_HOME"` 107 | [ -n "$CLASSPATH" ] && 108 | CLASSPATH=`cygpath --path --unix "$CLASSPATH"` 109 | fi 110 | 111 | # For Mingw, ensure paths are in UNIX format before anything is touched 112 | if $mingw ; then 113 | [ -n "$M2_HOME" ] && 114 | M2_HOME="`(cd "$M2_HOME"; pwd)`" 115 | [ -n "$JAVA_HOME" ] && 116 | JAVA_HOME="`(cd "$JAVA_HOME"; pwd)`" 117 | fi 118 | 119 | if [ -z "$JAVA_HOME" ]; then 120 | javaExecutable="`which javac`" 121 | if [ -n "$javaExecutable" ] && ! [ "`expr \"$javaExecutable\" : '\([^ ]*\)'`" = "no" ]; then 122 | # readlink(1) is not available as standard on Solaris 10. 123 | readLink=`which readlink` 124 | if [ ! `expr "$readLink" : '\([^ ]*\)'` = "no" ]; then 125 | if $darwin ; then 126 | javaHome="`dirname \"$javaExecutable\"`" 127 | javaExecutable="`cd \"$javaHome\" && pwd -P`/javac" 128 | else 129 | javaExecutable="`readlink -f \"$javaExecutable\"`" 130 | fi 131 | javaHome="`dirname \"$javaExecutable\"`" 132 | javaHome=`expr "$javaHome" : '\(.*\)/bin'` 133 | JAVA_HOME="$javaHome" 134 | export JAVA_HOME 135 | fi 136 | fi 137 | fi 138 | 139 | if [ -z "$JAVACMD" ] ; then 140 | if [ -n "$JAVA_HOME" ] ; then 141 | if [ -x "$JAVA_HOME/jre/sh/java" ] ; then 142 | # IBM's JDK on AIX uses strange locations for the executables 143 | JAVACMD="$JAVA_HOME/jre/sh/java" 144 | else 145 | JAVACMD="$JAVA_HOME/bin/java" 146 | fi 147 | else 148 | JAVACMD="`which java`" 149 | fi 150 | fi 151 | 152 | if [ ! -x "$JAVACMD" ] ; then 153 | echo "Error: JAVA_HOME is not defined correctly." >&2 154 | echo " We cannot execute $JAVACMD" >&2 155 | exit 1 156 | fi 157 | 158 | if [ -z "$JAVA_HOME" ] ; then 159 | echo "Warning: JAVA_HOME environment variable is not set." 160 | fi 161 | 162 | CLASSWORLDS_LAUNCHER=org.codehaus.plexus.classworlds.launcher.Launcher 163 | 164 | # traverses directory structure from process work directory to filesystem root 165 | # first directory with .mvn subdirectory is considered project base directory 166 | find_maven_basedir() { 167 | 168 | if [ -z "$1" ] 169 | then 170 | echo "Path not specified to find_maven_basedir" 171 | return 1 172 | fi 173 | 174 | basedir="$1" 175 | wdir="$1" 176 | while [ "$wdir" != '/' ] ; do 177 | if [ -d "$wdir"/.mvn ] ; then 178 | basedir=$wdir 179 | break 180 | fi 181 | # workaround for JBEAP-8937 (on Solaris 10/Sparc) 182 | if [ -d "${wdir}" ]; then 183 | wdir=`cd "$wdir/.."; pwd` 184 | fi 185 | # end of workaround 186 | done 187 | echo "${basedir}" 188 | } 189 | 190 | # concatenates all lines of a file 191 | concat_lines() { 192 | if [ -f "$1" ]; then 193 | echo "$(tr -s '\n' ' ' < "$1")" 194 | fi 195 | } 196 | 197 | BASE_DIR=`find_maven_basedir "$(pwd)"` 198 | if [ -z "$BASE_DIR" ]; then 199 | exit 1; 200 | fi 201 | 202 | ########################################################################################## 203 | # Extension to allow automatically downloading the maven-wrapper.jar from Maven-central 204 | # This allows using the maven wrapper in projects that prohibit checking in binary data. 205 | ########################################################################################## 206 | if [ -r "$BASE_DIR/.mvn/wrapper/maven-wrapper.jar" ]; then 207 | if [ "$MVNW_VERBOSE" = true ]; then 208 | echo "Found .mvn/wrapper/maven-wrapper.jar" 209 | fi 210 | else 211 | if [ "$MVNW_VERBOSE" = true ]; then 212 | echo "Couldn't find .mvn/wrapper/maven-wrapper.jar, downloading it ..." 213 | fi 214 | if [ -n "$MVNW_REPOURL" ]; then 215 | jarUrl="$MVNW_REPOURL/io/takari/maven-wrapper/0.5.6/maven-wrapper-0.5.6.jar" 216 | else 217 | jarUrl="https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/0.5.6/maven-wrapper-0.5.6.jar" 218 | fi 219 | while IFS="=" read key value; do 220 | case "$key" in (wrapperUrl) jarUrl="$value"; break ;; 221 | esac 222 | done < "$BASE_DIR/.mvn/wrapper/maven-wrapper.properties" 223 | if [ "$MVNW_VERBOSE" = true ]; then 224 | echo "Downloading from: $jarUrl" 225 | fi 226 | wrapperJarPath="$BASE_DIR/.mvn/wrapper/maven-wrapper.jar" 227 | if $cygwin; then 228 | wrapperJarPath=`cygpath --path --windows "$wrapperJarPath"` 229 | fi 230 | 231 | if command -v wget > /dev/null; then 232 | if [ "$MVNW_VERBOSE" = true ]; then 233 | echo "Found wget ... using wget" 234 | fi 235 | if [ -z "$MVNW_USERNAME" ] || [ -z "$MVNW_PASSWORD" ]; then 236 | wget "$jarUrl" -O "$wrapperJarPath" 237 | else 238 | wget --http-user=$MVNW_USERNAME --http-password=$MVNW_PASSWORD "$jarUrl" -O "$wrapperJarPath" 239 | fi 240 | elif command -v curl > /dev/null; then 241 | if [ "$MVNW_VERBOSE" = true ]; then 242 | echo "Found curl ... using curl" 243 | fi 244 | if [ -z "$MVNW_USERNAME" ] || [ -z "$MVNW_PASSWORD" ]; then 245 | curl -o "$wrapperJarPath" "$jarUrl" -f 246 | else 247 | curl --user $MVNW_USERNAME:$MVNW_PASSWORD -o "$wrapperJarPath" "$jarUrl" -f 248 | fi 249 | 250 | else 251 | if [ "$MVNW_VERBOSE" = true ]; then 252 | echo "Falling back to using Java to download" 253 | fi 254 | javaClass="$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.java" 255 | # For Cygwin, switch paths to Windows format before running javac 256 | if $cygwin; then 257 | javaClass=`cygpath --path --windows "$javaClass"` 258 | fi 259 | if [ -e "$javaClass" ]; then 260 | if [ ! -e "$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.class" ]; then 261 | if [ "$MVNW_VERBOSE" = true ]; then 262 | echo " - Compiling MavenWrapperDownloader.java ..." 263 | fi 264 | # Compiling the Java class 265 | ("$JAVA_HOME/bin/javac" "$javaClass") 266 | fi 267 | if [ -e "$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.class" ]; then 268 | # Running the downloader 269 | if [ "$MVNW_VERBOSE" = true ]; then 270 | echo " - Running MavenWrapperDownloader.java ..." 271 | fi 272 | ("$JAVA_HOME/bin/java" -cp .mvn/wrapper MavenWrapperDownloader "$MAVEN_PROJECTBASEDIR") 273 | fi 274 | fi 275 | fi 276 | fi 277 | ########################################################################################## 278 | # End of extension 279 | ########################################################################################## 280 | 281 | export MAVEN_PROJECTBASEDIR=${MAVEN_BASEDIR:-"$BASE_DIR"} 282 | if [ "$MVNW_VERBOSE" = true ]; then 283 | echo $MAVEN_PROJECTBASEDIR 284 | fi 285 | MAVEN_OPTS="$(concat_lines "$MAVEN_PROJECTBASEDIR/.mvn/jvm.config") $MAVEN_OPTS" 286 | 287 | # For Cygwin, switch paths to Windows format before running java 288 | if $cygwin; then 289 | [ -n "$M2_HOME" ] && 290 | M2_HOME=`cygpath --path --windows "$M2_HOME"` 291 | [ -n "$JAVA_HOME" ] && 292 | JAVA_HOME=`cygpath --path --windows "$JAVA_HOME"` 293 | [ -n "$CLASSPATH" ] && 294 | CLASSPATH=`cygpath --path --windows "$CLASSPATH"` 295 | [ -n "$MAVEN_PROJECTBASEDIR" ] && 296 | MAVEN_PROJECTBASEDIR=`cygpath --path --windows "$MAVEN_PROJECTBASEDIR"` 297 | fi 298 | 299 | # Provide a "standardized" way to retrieve the CLI args that will 300 | # work with both Windows and non-Windows executions. 301 | MAVEN_CMD_LINE_ARGS="$MAVEN_CONFIG $@" 302 | export MAVEN_CMD_LINE_ARGS 303 | 304 | WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain 305 | 306 | exec "$JAVACMD" \ 307 | $MAVEN_OPTS \ 308 | -classpath "$MAVEN_PROJECTBASEDIR/.mvn/wrapper/maven-wrapper.jar" \ 309 | "-Dmaven.home=${M2_HOME}" "-Dmaven.multiModuleProjectDirectory=${MAVEN_PROJECTBASEDIR}" \ 310 | ${WRAPPER_LAUNCHER} $MAVEN_CONFIG "$@" 311 | -------------------------------------------------------------------------------- /mvnw.cmd: -------------------------------------------------------------------------------- 1 | @REM ---------------------------------------------------------------------------- 2 | @REM Licensed to the Apache Software Foundation (ASF) under one 3 | @REM or more contributor license agreements. See the NOTICE file 4 | @REM distributed with this work for additional information 5 | @REM regarding copyright ownership. The ASF licenses this file 6 | @REM to you under the Apache License, Version 2.0 (the 7 | @REM "License"); you may not use this file except in compliance 8 | @REM with the License. You may obtain a copy of the License at 9 | @REM 10 | @REM https://www.apache.org/licenses/LICENSE-2.0 11 | @REM 12 | @REM Unless required by applicable law or agreed to in writing, 13 | @REM software distributed under the License is distributed on an 14 | @REM "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 15 | @REM KIND, either express or implied. See the License for the 16 | @REM specific language governing permissions and limitations 17 | @REM under the License. 18 | @REM ---------------------------------------------------------------------------- 19 | 20 | @REM ---------------------------------------------------------------------------- 21 | @REM Maven Start Up Batch script 22 | @REM 23 | @REM Required ENV vars: 24 | @REM JAVA_HOME - location of a JDK home dir 25 | @REM 26 | @REM Optional ENV vars 27 | @REM M2_HOME - location of maven2's installed home dir 28 | @REM MAVEN_BATCH_ECHO - set to 'on' to enable the echoing of the batch commands 29 | @REM MAVEN_BATCH_PAUSE - set to 'on' to wait for a keystroke before ending 30 | @REM MAVEN_OPTS - parameters passed to the Java VM when running Maven 31 | @REM e.g. to debug Maven itself, use 32 | @REM set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000 33 | @REM MAVEN_SKIP_RC - flag to disable loading of mavenrc files 34 | @REM ---------------------------------------------------------------------------- 35 | 36 | @REM Begin all REM lines with '@' in case MAVEN_BATCH_ECHO is 'on' 37 | @echo off 38 | @REM set title of command window 39 | title %0 40 | @REM enable echoing by setting MAVEN_BATCH_ECHO to 'on' 41 | @if "%MAVEN_BATCH_ECHO%" == "on" echo %MAVEN_BATCH_ECHO% 42 | 43 | @REM set %HOME% to equivalent of $HOME 44 | if "%HOME%" == "" (set "HOME=%HOMEDRIVE%%HOMEPATH%") 45 | 46 | @REM Execute a user defined script before this one 47 | if not "%MAVEN_SKIP_RC%" == "" goto skipRcPre 48 | @REM check for pre script, once with legacy .bat ending and once with .cmd ending 49 | if exist "%HOME%\mavenrc_pre.bat" call "%HOME%\mavenrc_pre.bat" 50 | if exist "%HOME%\mavenrc_pre.cmd" call "%HOME%\mavenrc_pre.cmd" 51 | :skipRcPre 52 | 53 | @setlocal 54 | 55 | set ERROR_CODE=0 56 | 57 | @REM To isolate internal variables from possible post scripts, we use another setlocal 58 | @setlocal 59 | 60 | @REM ==== START VALIDATION ==== 61 | if not "%JAVA_HOME%" == "" goto OkJHome 62 | 63 | echo. 64 | echo Error: JAVA_HOME not found in your environment. >&2 65 | echo Please set the JAVA_HOME variable in your environment to match the >&2 66 | echo location of your Java installation. >&2 67 | echo. 68 | goto error 69 | 70 | :OkJHome 71 | if exist "%JAVA_HOME%\bin\java.exe" goto init 72 | 73 | echo. 74 | echo Error: JAVA_HOME is set to an invalid directory. >&2 75 | echo JAVA_HOME = "%JAVA_HOME%" >&2 76 | echo Please set the JAVA_HOME variable in your environment to match the >&2 77 | echo location of your Java installation. >&2 78 | echo. 79 | goto error 80 | 81 | @REM ==== END VALIDATION ==== 82 | 83 | :init 84 | 85 | @REM Find the project base dir, i.e. the directory that contains the folder ".mvn". 86 | @REM Fallback to current working directory if not found. 87 | 88 | set MAVEN_PROJECTBASEDIR=%MAVEN_BASEDIR% 89 | IF NOT "%MAVEN_PROJECTBASEDIR%"=="" goto endDetectBaseDir 90 | 91 | set EXEC_DIR=%CD% 92 | set WDIR=%EXEC_DIR% 93 | :findBaseDir 94 | IF EXIST "%WDIR%"\.mvn goto baseDirFound 95 | cd .. 96 | IF "%WDIR%"=="%CD%" goto baseDirNotFound 97 | set WDIR=%CD% 98 | goto findBaseDir 99 | 100 | :baseDirFound 101 | set MAVEN_PROJECTBASEDIR=%WDIR% 102 | cd "%EXEC_DIR%" 103 | goto endDetectBaseDir 104 | 105 | :baseDirNotFound 106 | set MAVEN_PROJECTBASEDIR=%EXEC_DIR% 107 | cd "%EXEC_DIR%" 108 | 109 | :endDetectBaseDir 110 | 111 | IF NOT EXIST "%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config" goto endReadAdditionalConfig 112 | 113 | @setlocal EnableExtensions EnableDelayedExpansion 114 | for /F "usebackq delims=" %%a in ("%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config") do set JVM_CONFIG_MAVEN_PROPS=!JVM_CONFIG_MAVEN_PROPS! %%a 115 | @endlocal & set JVM_CONFIG_MAVEN_PROPS=%JVM_CONFIG_MAVEN_PROPS% 116 | 117 | :endReadAdditionalConfig 118 | 119 | SET MAVEN_JAVA_EXE="%JAVA_HOME%\bin\java.exe" 120 | set WRAPPER_JAR="%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.jar" 121 | set WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain 122 | 123 | set DOWNLOAD_URL="https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/0.5.6/maven-wrapper-0.5.6.jar" 124 | 125 | FOR /F "tokens=1,2 delims==" %%A IN ("%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.properties") DO ( 126 | IF "%%A"=="wrapperUrl" SET DOWNLOAD_URL=%%B 127 | ) 128 | 129 | @REM Extension to allow automatically downloading the maven-wrapper.jar from Maven-central 130 | @REM This allows using the maven wrapper in projects that prohibit checking in binary data. 131 | if exist %WRAPPER_JAR% ( 132 | if "%MVNW_VERBOSE%" == "true" ( 133 | echo Found %WRAPPER_JAR% 134 | ) 135 | ) else ( 136 | if not "%MVNW_REPOURL%" == "" ( 137 | SET DOWNLOAD_URL="%MVNW_REPOURL%/io/takari/maven-wrapper/0.5.6/maven-wrapper-0.5.6.jar" 138 | ) 139 | if "%MVNW_VERBOSE%" == "true" ( 140 | echo Couldn't find %WRAPPER_JAR%, downloading it ... 141 | echo Downloading from: %DOWNLOAD_URL% 142 | ) 143 | 144 | powershell -Command "&{"^ 145 | "$webclient = new-object System.Net.WebClient;"^ 146 | "if (-not ([string]::IsNullOrEmpty('%MVNW_USERNAME%') -and [string]::IsNullOrEmpty('%MVNW_PASSWORD%'))) {"^ 147 | "$webclient.Credentials = new-object System.Net.NetworkCredential('%MVNW_USERNAME%', '%MVNW_PASSWORD%');"^ 148 | "}"^ 149 | "[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12; $webclient.DownloadFile('%DOWNLOAD_URL%', '%WRAPPER_JAR%')"^ 150 | "}" 151 | if "%MVNW_VERBOSE%" == "true" ( 152 | echo Finished downloading %WRAPPER_JAR% 153 | ) 154 | ) 155 | @REM End of extension 156 | 157 | @REM Provide a "standardized" way to retrieve the CLI args that will 158 | @REM work with both Windows and non-Windows executions. 159 | set MAVEN_CMD_LINE_ARGS=%* 160 | 161 | %MAVEN_JAVA_EXE% %JVM_CONFIG_MAVEN_PROPS% %MAVEN_OPTS% %MAVEN_DEBUG_OPTS% -classpath %WRAPPER_JAR% "-Dmaven.multiModuleProjectDirectory=%MAVEN_PROJECTBASEDIR%" %WRAPPER_LAUNCHER% %MAVEN_CONFIG% %* 162 | if ERRORLEVEL 1 goto error 163 | goto end 164 | 165 | :error 166 | set ERROR_CODE=1 167 | 168 | :end 169 | @endlocal & set ERROR_CODE=%ERROR_CODE% 170 | 171 | if not "%MAVEN_SKIP_RC%" == "" goto skipRcPost 172 | @REM check for post script, once with legacy .bat ending and once with .cmd ending 173 | if exist "%HOME%\mavenrc_post.bat" call "%HOME%\mavenrc_post.bat" 174 | if exist "%HOME%\mavenrc_post.cmd" call "%HOME%\mavenrc_post.cmd" 175 | :skipRcPost 176 | 177 | @REM pause the script if MAVEN_BATCH_PAUSE is set to 'on' 178 | if "%MAVEN_BATCH_PAUSE%" == "on" pause 179 | 180 | if "%MAVEN_TERMINATE_CMD%" == "on" exit %ERROR_CODE% 181 | 182 | exit /B %ERROR_CODE% 183 | -------------------------------------------------------------------------------- /pom.xml: -------------------------------------------------------------------------------- 1 | 2 | 4 | 4.0.0 5 | 6 | org.springframework.boot 7 | spring-boot-starter-parent 8 | 2.5.2 9 | 10 | 11 | com.dailycodebuffer 12 | reactive-programming-tutorial 13 | 0.0.1-SNAPSHOT 14 | reactive-programming-tutorial 15 | Demo project for Spring Boot 16 | 17 | 11 18 | 19 | 20 | 21 | org.springframework.boot 22 | spring-boot-starter-webflux 23 | 24 | 25 | 26 | org.projectlombok 27 | lombok 28 | true 29 | 30 | 31 | org.springframework.boot 32 | spring-boot-starter-test 33 | test 34 | 35 | 36 | io.projectreactor 37 | reactor-test 38 | test 39 | 40 | 41 | io.projectreactor 42 | reactor-tools 43 | 44 | 45 | 46 | 47 | 48 | 49 | org.springframework.boot 50 | spring-boot-maven-plugin 51 | 52 | 53 | 54 | org.projectlombok 55 | lombok 56 | 57 | 58 | 59 | 60 | 61 | 62 | 63 | 64 | -------------------------------------------------------------------------------- /src/main/java/com/dailycodebuffer/reactiveprogramming/ReactiveProgrammingTutorialApplication.java: -------------------------------------------------------------------------------- 1 | package com.dailycodebuffer.reactiveprogramming; 2 | 3 | import org.springframework.boot.SpringApplication; 4 | import org.springframework.boot.autoconfigure.SpringBootApplication; 5 | import reactor.tools.agent.ReactorDebugAgent; 6 | 7 | @SpringBootApplication 8 | public class ReactiveProgrammingTutorialApplication { 9 | 10 | public static void main(String[] args) { 11 | ReactorDebugAgent.init(); 12 | SpringApplication.run(ReactiveProgrammingTutorialApplication.class, args); 13 | } 14 | 15 | } 16 | -------------------------------------------------------------------------------- /src/main/java/com/dailycodebuffer/reactiveprogramming/domain/Book.java: -------------------------------------------------------------------------------- 1 | package com.dailycodebuffer.reactiveprogramming.domain; 2 | 3 | import lombok.AllArgsConstructor; 4 | import lombok.Data; 5 | import lombok.NoArgsConstructor; 6 | 7 | import java.util.List; 8 | 9 | @Data 10 | @AllArgsConstructor 11 | @NoArgsConstructor 12 | public class Book { 13 | private BookInfo bookInfo; 14 | private List reviews; 15 | } 16 | -------------------------------------------------------------------------------- /src/main/java/com/dailycodebuffer/reactiveprogramming/domain/BookInfo.java: -------------------------------------------------------------------------------- 1 | package com.dailycodebuffer.reactiveprogramming.domain; 2 | 3 | import lombok.AllArgsConstructor; 4 | import lombok.Data; 5 | import lombok.NoArgsConstructor; 6 | 7 | @Data 8 | @AllArgsConstructor 9 | @NoArgsConstructor 10 | public class BookInfo { 11 | private long bookId; 12 | private String title; 13 | private String author; 14 | private String ISBN; 15 | } 16 | -------------------------------------------------------------------------------- /src/main/java/com/dailycodebuffer/reactiveprogramming/domain/Review.java: -------------------------------------------------------------------------------- 1 | package com.dailycodebuffer.reactiveprogramming.domain; 2 | 3 | import lombok.AllArgsConstructor; 4 | import lombok.Data; 5 | import lombok.NoArgsConstructor; 6 | 7 | @Data 8 | @AllArgsConstructor 9 | @NoArgsConstructor 10 | public class Review { 11 | private long reviewId; 12 | private long bookId; 13 | private double ratings; 14 | private String comments; 15 | } 16 | -------------------------------------------------------------------------------- /src/main/java/com/dailycodebuffer/reactiveprogramming/exception/BookException.java: -------------------------------------------------------------------------------- 1 | package com.dailycodebuffer.reactiveprogramming.exception; 2 | 3 | public class BookException extends RuntimeException{ 4 | public BookException(String message) { 5 | super(message); 6 | } 7 | } 8 | -------------------------------------------------------------------------------- /src/main/java/com/dailycodebuffer/reactiveprogramming/services/BookInfoService.java: -------------------------------------------------------------------------------- 1 | package com.dailycodebuffer.reactiveprogramming.services; 2 | 3 | import com.dailycodebuffer.reactiveprogramming.domain.BookInfo; 4 | import reactor.core.publisher.Flux; 5 | import reactor.core.publisher.Mono; 6 | 7 | import java.util.List; 8 | 9 | public class BookInfoService { 10 | 11 | public Flux getBooks() { 12 | var books = List.of( 13 | new BookInfo(1,"Book One","Author One","12121212"), 14 | new BookInfo(2,"Book Two","Author Two","42342343"), 15 | new BookInfo(3,"Book Three","Author Three","23425444") 16 | ); 17 | 18 | return Flux.fromIterable(books); 19 | } 20 | 21 | public Mono getBookById(long bookId) { 22 | var book = new BookInfo(bookId, "Book One","Author One","12121212"); 23 | 24 | return Mono.just(book); 25 | } 26 | } 27 | -------------------------------------------------------------------------------- /src/main/java/com/dailycodebuffer/reactiveprogramming/services/BookService.java: -------------------------------------------------------------------------------- 1 | package com.dailycodebuffer.reactiveprogramming.services; 2 | 3 | import com.dailycodebuffer.reactiveprogramming.domain.Book; 4 | import com.dailycodebuffer.reactiveprogramming.domain.Review; 5 | import com.dailycodebuffer.reactiveprogramming.exception.BookException; 6 | import lombok.extern.slf4j.Slf4j; 7 | import reactor.core.Exceptions; 8 | import reactor.core.publisher.Flux; 9 | import reactor.core.publisher.Mono; 10 | import reactor.util.retry.Retry; 11 | import reactor.util.retry.RetryBackoffSpec; 12 | 13 | import java.time.Duration; 14 | import java.util.List; 15 | 16 | @Slf4j 17 | public class BookService { 18 | 19 | private BookInfoService bookInfoService; 20 | private ReviewService reviewService; 21 | 22 | public BookService(BookInfoService bookInfoService, ReviewService reviewService) { 23 | this.bookInfoService = bookInfoService; 24 | this.reviewService = reviewService; 25 | } 26 | 27 | public Flux getBooks() { 28 | var allBooks = bookInfoService.getBooks(); 29 | return allBooks 30 | .flatMap(bookInfo -> { 31 | Mono> reviews = 32 | reviewService.getReviews(bookInfo.getBookId()).collectList(); 33 | return reviews 34 | .map(review -> new Book(bookInfo,review)); 35 | }) 36 | .onErrorMap(throwable -> { 37 | log.error("Exception is :" + throwable); 38 | return new BookException("Exception occurred while fetching Books"); 39 | }) 40 | .log(); 41 | } 42 | 43 | public Flux getBooksRetry() { 44 | var allBooks = bookInfoService.getBooks(); 45 | return allBooks 46 | .flatMap(bookInfo -> { 47 | Mono> reviews = 48 | reviewService.getReviews(bookInfo.getBookId()).collectList(); 49 | return reviews 50 | .map(review -> new Book(bookInfo,review)); 51 | }) 52 | .onErrorMap(throwable -> { 53 | log.error("Exception is :" + throwable); 54 | return new BookException("Exception occurred while fetching Books"); 55 | }) 56 | .retry(3) 57 | .log(); 58 | } 59 | 60 | public Flux getBooksRetryWhen() { 61 | //var retrySpecs = getRetryBackoffSpec(); 62 | var allBooks = bookInfoService.getBooks(); 63 | return allBooks 64 | .flatMap(bookInfo -> { 65 | Mono> reviews = 66 | reviewService.getReviews(bookInfo.getBookId()).collectList(); 67 | return reviews 68 | .map(review -> new Book(bookInfo,review)); 69 | }) 70 | .onErrorMap(throwable -> { 71 | log.error("Exception is :" + throwable); 72 | return new BookException("Exception occurred while fetching Books"); 73 | }) 74 | .retryWhen(getRetryBackoffSpec()) 75 | .log(); 76 | } 77 | 78 | private RetryBackoffSpec getRetryBackoffSpec() { 79 | return Retry.backoff( 80 | 3, 81 | Duration.ofMillis(1000) 82 | ).filter(throwable -> throwable instanceof BookException) 83 | .onRetryExhaustedThrow((retryBackoffSpec, retrySignal) -> 84 | Exceptions.propagate(retrySignal.failure()) 85 | ); 86 | } 87 | 88 | public Mono getBookById(long bookId) { 89 | var book = bookInfoService.getBookById(bookId); 90 | var review = reviewService 91 | .getReviews(bookId) 92 | .collectList(); 93 | 94 | return book 95 | .zipWith(review,(b,r) -> new Book(b,r)); 96 | 97 | } 98 | } 99 | -------------------------------------------------------------------------------- /src/main/java/com/dailycodebuffer/reactiveprogramming/services/FluxAndMonoServices.java: -------------------------------------------------------------------------------- 1 | package com.dailycodebuffer.reactiveprogramming.services; 2 | 3 | import reactor.core.publisher.Flux; 4 | import reactor.core.publisher.Mono; 5 | 6 | import java.time.Duration; 7 | import java.util.List; 8 | import java.util.Random; 9 | import java.util.function.Function; 10 | 11 | public class FluxAndMonoServices { 12 | 13 | public Flux fruitsFlux() { 14 | return Flux.fromIterable(List.of("Mango","Orange","Banana")).log(); 15 | } 16 | 17 | public Flux fruitsFluxMap() { 18 | return Flux.fromIterable(List.of("Mango","Orange","Banana")) 19 | .map(String::toUpperCase); 20 | } 21 | 22 | public Flux fruitsFluxFilter(int number) { 23 | return Flux.fromIterable(List.of("Mango","Orange","Banana")) 24 | .filter(s -> s.length() > number); 25 | } 26 | 27 | public Flux fruitsFluxFilterMap(int number) { 28 | return Flux.fromIterable(List.of("Mango","Orange","Banana")) 29 | .filter(s -> s.length() > number) 30 | .map(String::toUpperCase); 31 | } 32 | 33 | public Flux fruitsFluxFlatMap() { 34 | return Flux.fromIterable(List.of("Mango","Orange","Banana")) 35 | .flatMap(s -> Flux.just(s.split(""))) 36 | .log(); 37 | } 38 | 39 | public Flux fruitsFluxFlatMapAsync() { 40 | return Flux.fromIterable(List.of("Mango","Orange","Banana")) 41 | .flatMap(s -> Flux.just(s.split("")) 42 | .delayElements(Duration.ofMillis( 43 | new Random().nextInt(1000) 44 | ))) 45 | .log(); 46 | } 47 | 48 | public Flux fruitsFluxConcatMap() { 49 | return Flux.fromIterable(List.of("Mango","Orange","Banana")) 50 | .concatMap(s -> Flux.just(s.split("")) 51 | .delayElements(Duration.ofMillis( 52 | new Random().nextInt(1000) 53 | ))) 54 | .log(); 55 | } 56 | 57 | public Mono> fruitMonoFlatMap() { 58 | return Mono.just("Mango") 59 | .flatMap(s -> Mono.just(List.of(s.split("")))) 60 | .log(); 61 | } 62 | 63 | public Flux fruitMonoFlatMapMany() { 64 | return Mono.just("Mango") 65 | .flatMapMany(s -> Flux.just(s.split(""))) 66 | .log(); 67 | } 68 | 69 | public Flux fruitsFluxTransform(int number) { 70 | 71 | Function,Flux> filterData 72 | = data -> data.filter(s -> s.length() > number); 73 | 74 | return Flux.fromIterable(List.of("Mango","Orange","Banana")) 75 | .transform(filterData) 76 | .log(); 77 | //.filter(s -> s.length() > number); 78 | } 79 | 80 | public Flux fruitsFluxTransformDefaultIfEmpty(int number) { 81 | 82 | Function,Flux> filterData 83 | = data -> data.filter(s -> s.length() > number); 84 | 85 | return Flux.fromIterable(List.of("Mango","Orange","Banana")) 86 | .transform(filterData) 87 | .defaultIfEmpty("Default") 88 | .log(); 89 | 90 | } 91 | 92 | public Flux fruitsFluxTransformSwitchIfEmpty(int number) { 93 | 94 | Function,Flux> filterData 95 | = data -> data.filter(s -> s.length() > number); 96 | 97 | return Flux.fromIterable(List.of("Mango","Orange","Banana")) 98 | .transform(filterData) 99 | .switchIfEmpty(Flux.just("Pineapple","Jack Fruit") 100 | .transform(filterData)) 101 | .log(); 102 | 103 | } 104 | 105 | public Flux fruitsFluxConcat() { 106 | var fruits = Flux.just("Mango","Orange"); 107 | var veggies = Flux.just("Tomato","Lemon"); 108 | 109 | return Flux.concat(fruits,veggies); 110 | } 111 | 112 | public Flux fruitsFluxConcatWith() { 113 | var fruits = Flux.just("Mango","Orange"); 114 | var veggies = Flux.just("Tomato","Lemon"); 115 | 116 | return fruits.concatWith(veggies); 117 | } 118 | 119 | 120 | public Flux fruitsMonoConcatWith() { 121 | var fruits = Mono.just("Mango"); 122 | var veggies = Mono.just("Tomato"); 123 | 124 | return fruits.concatWith(veggies); 125 | } 126 | 127 | public Flux fruitsFluxMerge() { 128 | var fruits = Flux.just("Mango","Orange") 129 | .delayElements(Duration.ofMillis(50)); 130 | var veggies = Flux.just("Tomato","Lemon") 131 | .delayElements(Duration.ofMillis(75)); 132 | 133 | return Flux.merge(fruits,veggies); 134 | } 135 | 136 | public Flux fruitsFluxMergeWith() { 137 | var fruits = Flux.just("Mango","Orange") 138 | .delayElements(Duration.ofMillis(50)); 139 | var veggies = Flux.just("Tomato","Lemon") 140 | .delayElements(Duration.ofMillis(75)); 141 | 142 | return fruits.mergeWith(veggies); 143 | } 144 | 145 | public Flux fruitsFluxMergeWithSequential() { 146 | var fruits = Flux.just("Mango","Orange") 147 | .delayElements(Duration.ofMillis(50)); 148 | var veggies = Flux.just("Tomato","Lemon") 149 | .delayElements(Duration.ofMillis(75)); 150 | 151 | return Flux.mergeSequential(fruits,veggies); 152 | } 153 | 154 | public Flux fruitsFluxZip() { 155 | var fruits = Flux.just("Mango","Orange"); 156 | var veggies = Flux.just("Tomato","Lemon"); 157 | 158 | return Flux.zip(fruits,veggies, 159 | (first,second) -> first+second).log(); 160 | } 161 | 162 | public Flux fruitsFluxZipWith() { 163 | var fruits = Flux.just("Mango","Orange"); 164 | var veggies = Flux.just("Tomato","Lemon"); 165 | 166 | return fruits.zipWith(veggies, 167 | (first,second) -> first+second).log(); 168 | } 169 | 170 | public Flux fruitsFluxZipTuple() { 171 | var fruits = Flux.just("Mango","Orange"); 172 | var veggies = Flux.just("Tomato","Lemon"); 173 | var moreVeggies = Flux.just("Potato","Beans"); 174 | 175 | return Flux.zip(fruits,veggies,moreVeggies) 176 | .map(objects -> objects.getT1() + objects.getT2() + objects.getT3()); 177 | } 178 | 179 | public Mono fruitsMonoZipWith() { 180 | var fruits = Mono.just("Mango"); 181 | var veggies = Mono.just("Tomato"); 182 | 183 | return fruits.zipWith(veggies, 184 | (first,second) -> first+second).log(); 185 | } 186 | 187 | 188 | public Mono fruitMono() { 189 | return Mono.just("Mango").log(); 190 | } 191 | 192 | 193 | public Flux fruitsFluxFilterDoOn(int number) { 194 | return Flux.fromIterable(List.of("Mango","Orange","Banana")) 195 | .filter(s -> s.length() > number) 196 | .doOnNext(s -> { 197 | System.out.println("s = " + s); 198 | }) 199 | .doOnSubscribe(subscription -> { 200 | System.out.println("subscription.toString() = " + subscription.toString()); 201 | }) 202 | .doOnComplete(() -> System.out.println("Completed!!!")); 203 | } 204 | 205 | 206 | public Flux fruitsFluxOnErrorReturn() { 207 | return Flux.just("Apple","Mango") 208 | .concatWith(Flux.error( 209 | new RuntimeException("Exception Occurred") 210 | )) 211 | .onErrorReturn("Orange"); 212 | } 213 | 214 | public Flux fruitsFluxOnErrorContinue() { 215 | return Flux.just("Apple","Mango","Orange") 216 | .map(s -> { 217 | if (s.equalsIgnoreCase("Mango")) 218 | throw new RuntimeException("Exception Occurred"); 219 | return s.toUpperCase(); 220 | }) 221 | .onErrorContinue((e,f) -> { 222 | System.out.println("e = " + e); 223 | System.out.println("f = " + f); 224 | }); 225 | } 226 | 227 | public Flux fruitsFluxOnErrorMap() { 228 | return Flux.just("Apple","Mango","Orange") 229 | .checkpoint("Error Checkpoint1") 230 | .map(s -> { 231 | if (s.equalsIgnoreCase("Mango")) 232 | throw new RuntimeException("Exception Occurred"); 233 | return s.toUpperCase(); 234 | }) 235 | .checkpoint("Error Checkpoint2") 236 | .onErrorMap(throwable -> { 237 | System.out.println("throwable = " + throwable); 238 | return new IllegalStateException("From onError Map"); 239 | }); 240 | } 241 | 242 | public Flux fruitsFluxOnError() { 243 | return Flux.just("Apple","Mango","Orange") 244 | .map(s -> { 245 | if (s.equalsIgnoreCase("Mango")) 246 | throw new RuntimeException("Exception Occurred"); 247 | return s.toUpperCase(); 248 | }) 249 | .doOnError(throwable -> { 250 | System.out.println("throwable = " + throwable); 251 | 252 | }); 253 | } 254 | 255 | 256 | 257 | public static void main(String[] args) { 258 | 259 | FluxAndMonoServices fluxAndMonoServices 260 | = new FluxAndMonoServices(); 261 | 262 | fluxAndMonoServices.fruitsFlux() 263 | .subscribe(s -> { 264 | System.out.println("s = " + s); 265 | }); 266 | 267 | fluxAndMonoServices.fruitMono() 268 | .subscribe(s -> { 269 | System.out.println("Mono -> s = " + s); 270 | }); 271 | } 272 | } 273 | -------------------------------------------------------------------------------- /src/main/java/com/dailycodebuffer/reactiveprogramming/services/ReviewService.java: -------------------------------------------------------------------------------- 1 | package com.dailycodebuffer.reactiveprogramming.services; 2 | 3 | import com.dailycodebuffer.reactiveprogramming.domain.Review; 4 | import reactor.core.publisher.Flux; 5 | 6 | import java.util.List; 7 | 8 | public class ReviewService { 9 | 10 | public Flux getReviews(long bookId) { 11 | var reviewList = List.of( 12 | new Review(1,bookId,9.1,"Good Book"), 13 | new Review(2,bookId,8.6,"Worth Reading") 14 | ); 15 | 16 | return Flux.fromIterable(reviewList); 17 | } 18 | } 19 | -------------------------------------------------------------------------------- /src/main/resources/application.properties: -------------------------------------------------------------------------------- 1 | 2 | -------------------------------------------------------------------------------- /src/test/java/com/dailycodebuffer/reactiveprogramming/BackPressureTest.java: -------------------------------------------------------------------------------- 1 | package com.dailycodebuffer.reactiveprogramming; 2 | 3 | import org.junit.jupiter.api.Test; 4 | import org.reactivestreams.Subscription; 5 | import reactor.core.publisher.BaseSubscriber; 6 | import reactor.core.publisher.Flux; 7 | 8 | public class BackPressureTest { 9 | 10 | @Test 11 | public void testBackPressure() { 12 | var numbers = Flux.range(1,100).log(); 13 | //numbers.subscribe(integer -> System.out.println("integer = " + integer)); 14 | 15 | numbers.subscribe(new BaseSubscriber() { 16 | @Override 17 | protected void hookOnSubscribe(Subscription subscription) { 18 | request(3); 19 | } 20 | 21 | @Override 22 | protected void hookOnNext(Integer value) { 23 | System.out.println("value = " + value); 24 | if(value ==3) cancel(); 25 | } 26 | 27 | @Override 28 | protected void hookOnComplete() { 29 | System.out.println("Completed!!"); 30 | } 31 | 32 | @Override 33 | protected void hookOnError(Throwable throwable) { 34 | super.hookOnError(throwable); 35 | } 36 | 37 | @Override 38 | protected void hookOnCancel() { 39 | super.hookOnCancel(); 40 | } 41 | }); 42 | } 43 | 44 | @Test 45 | public void testBackPressureDrop() { 46 | var numbers = Flux.range(1,100).log(); 47 | //numbers.subscribe(integer -> System.out.println("integer = " + integer)); 48 | 49 | numbers 50 | .onBackpressureDrop(integer -> { 51 | System.out.println("Dropped Values = " + integer); 52 | }) 53 | .subscribe(new BaseSubscriber() { 54 | @Override 55 | protected void hookOnSubscribe(Subscription subscription) { 56 | request(3); 57 | } 58 | 59 | @Override 60 | protected void hookOnNext(Integer value) { 61 | System.out.println("value = " + value); 62 | if(value ==3) hookOnCancel(); 63 | } 64 | 65 | @Override 66 | protected void hookOnComplete() { 67 | System.out.println("Completed!!"); 68 | } 69 | 70 | @Override 71 | protected void hookOnError(Throwable throwable) { 72 | super.hookOnError(throwable); 73 | } 74 | 75 | @Override 76 | protected void hookOnCancel() { 77 | super.hookOnCancel(); 78 | } 79 | }); 80 | } 81 | 82 | 83 | @Test 84 | public void testBackPressureBuffer() { 85 | var numbers = Flux.range(1,100).log(); 86 | //numbers.subscribe(integer -> System.out.println("integer = " + integer)); 87 | 88 | numbers 89 | .onBackpressureBuffer(10, 90 | i -> System.out.println("Buffered Value = " + i)) 91 | .subscribe(new BaseSubscriber() { 92 | @Override 93 | protected void hookOnSubscribe(Subscription subscription) { 94 | request(3); 95 | } 96 | 97 | @Override 98 | protected void hookOnNext(Integer value) { 99 | System.out.println("value = " + value); 100 | if(value ==3) hookOnCancel(); 101 | } 102 | 103 | @Override 104 | protected void hookOnComplete() { 105 | System.out.println("Completed!!"); 106 | } 107 | 108 | @Override 109 | protected void hookOnError(Throwable throwable) { 110 | super.hookOnError(throwable); 111 | } 112 | 113 | @Override 114 | protected void hookOnCancel() { 115 | super.hookOnCancel(); 116 | } 117 | }); 118 | } 119 | 120 | 121 | @Test 122 | public void testBackPressureError() { 123 | var numbers = Flux.range(1,100).log(); 124 | //numbers.subscribe(integer -> System.out.println("integer = " + integer)); 125 | 126 | numbers 127 | .onBackpressureError() 128 | .subscribe(new BaseSubscriber() { 129 | @Override 130 | protected void hookOnSubscribe(Subscription subscription) { 131 | request(3); 132 | } 133 | 134 | @Override 135 | protected void hookOnNext(Integer value) { 136 | System.out.println("value = " + value); 137 | if(value ==3) hookOnCancel(); 138 | } 139 | 140 | @Override 141 | protected void hookOnComplete() { 142 | System.out.println("Completed!!"); 143 | } 144 | 145 | @Override 146 | protected void hookOnError(Throwable throwable) { 147 | System.out.println("throwable = " + throwable); 148 | } 149 | 150 | @Override 151 | protected void hookOnCancel() { 152 | super.hookOnCancel(); 153 | } 154 | }); 155 | } 156 | } 157 | -------------------------------------------------------------------------------- /src/test/java/com/dailycodebuffer/reactiveprogramming/HotAndColdStreamsTest.java: -------------------------------------------------------------------------------- 1 | package com.dailycodebuffer.reactiveprogramming; 2 | 3 | import lombok.SneakyThrows; 4 | import org.junit.jupiter.api.Test; 5 | import reactor.core.publisher.ConnectableFlux; 6 | import reactor.core.publisher.Flux; 7 | 8 | import java.time.Duration; 9 | 10 | public class HotAndColdStreamsTest { 11 | 12 | @Test 13 | public void colStreamTest() { 14 | var numbers = Flux.range(1,10); 15 | 16 | numbers.subscribe(integer -> System.out.println("Subscriber 1 = " + integer)); 17 | numbers.subscribe(integer -> System.out.println("Subscriber 2 = " + integer)); 18 | } 19 | 20 | @SneakyThrows 21 | @Test 22 | public void hotStreamTest() { 23 | var numbers = Flux.range(1,10) 24 | .delayElements(Duration.ofMillis(1000)); 25 | 26 | ConnectableFlux publisher = numbers.publish(); 27 | publisher.connect(); 28 | 29 | publisher.subscribe(integer -> System.out.println("Subscriber 1 = " + integer)); 30 | Thread.sleep(4000); 31 | publisher.subscribe(integer -> System.out.println("Subscriber 2 = " + integer)); 32 | Thread.sleep(10000); 33 | } 34 | } 35 | -------------------------------------------------------------------------------- /src/test/java/com/dailycodebuffer/reactiveprogramming/ReactiveProgrammingTutorialApplicationTests.java: -------------------------------------------------------------------------------- 1 | package com.dailycodebuffer.reactiveprogramming; 2 | 3 | import org.junit.jupiter.api.Test; 4 | import org.springframework.boot.test.context.SpringBootTest; 5 | 6 | @SpringBootTest 7 | class ReactiveProgrammingTutorialApplicationTests { 8 | 9 | @Test 10 | void contextLoads() { 11 | } 12 | 13 | } 14 | -------------------------------------------------------------------------------- /src/test/java/com/dailycodebuffer/reactiveprogramming/services/BookServiceMockTest.java: -------------------------------------------------------------------------------- 1 | package com.dailycodebuffer.reactiveprogramming.services; 2 | 3 | import com.dailycodebuffer.reactiveprogramming.exception.BookException; 4 | import org.junit.jupiter.api.Test; 5 | import org.junit.jupiter.api.extension.ExtendWith; 6 | import org.mockito.InjectMocks; 7 | import org.mockito.Mock; 8 | import org.mockito.Mockito; 9 | import org.mockito.junit.jupiter.MockitoExtension; 10 | import reactor.test.StepVerifier; 11 | 12 | import static org.junit.jupiter.api.Assertions.*; 13 | 14 | @ExtendWith(MockitoExtension.class) 15 | class BookServiceMockTest { 16 | 17 | @Mock 18 | private BookInfoService bookInfoService; 19 | 20 | @Mock 21 | private ReviewService reviewService; 22 | 23 | @InjectMocks 24 | private BookService bookService; 25 | 26 | @Test 27 | void getBooksMock() { 28 | 29 | Mockito.when(bookInfoService.getBooks()) 30 | .thenCallRealMethod(); 31 | 32 | Mockito.when(reviewService.getReviews(Mockito.anyLong())) 33 | .thenCallRealMethod(); 34 | 35 | var books = bookService.getBooks(); 36 | 37 | StepVerifier.create(books) 38 | .expectNextCount(3) 39 | .verifyComplete(); 40 | } 41 | 42 | @Test 43 | void getBooksMockOnError() { 44 | 45 | Mockito.when(bookInfoService.getBooks()) 46 | .thenCallRealMethod(); 47 | 48 | Mockito.when(reviewService.getReviews(Mockito.anyLong())) 49 | .thenThrow(new IllegalStateException("exception using test")); 50 | 51 | var books = bookService.getBooks(); 52 | 53 | StepVerifier.create(books) 54 | .expectError(BookException.class) 55 | .verify(); 56 | } 57 | 58 | @Test 59 | void getBooksMockOnErrorRetry() { 60 | 61 | Mockito.when(bookInfoService.getBooks()) 62 | .thenCallRealMethod(); 63 | 64 | Mockito.when(reviewService.getReviews(Mockito.anyLong())) 65 | .thenThrow(new IllegalStateException("exception using test")); 66 | 67 | var books = bookService.getBooksRetry(); 68 | 69 | StepVerifier.create(books) 70 | .expectError(BookException.class) 71 | .verify(); 72 | } 73 | 74 | @Test 75 | void getBooksMockOnErrorRetryWhen() { 76 | 77 | Mockito.when(bookInfoService.getBooks()) 78 | .thenCallRealMethod(); 79 | 80 | Mockito.when(reviewService.getReviews(Mockito.anyLong())) 81 | .thenThrow(new IllegalStateException("exception using test")); 82 | 83 | var books = bookService.getBooksRetryWhen(); 84 | 85 | StepVerifier.create(books) 86 | .expectError(BookException.class) 87 | .verify(); 88 | } 89 | } -------------------------------------------------------------------------------- /src/test/java/com/dailycodebuffer/reactiveprogramming/services/BookServiceTest.java: -------------------------------------------------------------------------------- 1 | package com.dailycodebuffer.reactiveprogramming.services; 2 | 3 | import org.junit.jupiter.api.Test; 4 | import reactor.test.StepVerifier; 5 | 6 | import static org.junit.jupiter.api.Assertions.*; 7 | 8 | class BookServiceTest { 9 | 10 | private BookInfoService bookInfoService 11 | = new BookInfoService(); 12 | 13 | private ReviewService reviewService 14 | = new ReviewService(); 15 | 16 | private BookService bookService 17 | = new BookService(bookInfoService,reviewService); 18 | 19 | @Test 20 | void getBooks() { 21 | var books = bookService.getBooks(); 22 | StepVerifier.create(books) 23 | .assertNext(book -> { 24 | assertEquals("Book One",book.getBookInfo().getTitle()); 25 | assertEquals(2,book.getReviews().size()); 26 | }) 27 | .assertNext(book -> { 28 | assertEquals("Book Two",book.getBookInfo().getTitle()); 29 | assertEquals(2,book.getReviews().size()); 30 | }) 31 | .assertNext(book -> { 32 | assertEquals("Book Three",book.getBookInfo().getTitle()); 33 | assertEquals(2,book.getReviews().size()); 34 | }) 35 | .verifyComplete(); 36 | 37 | } 38 | 39 | @Test 40 | void getBookById() { 41 | var book = bookService.getBookById(1).log(); 42 | StepVerifier.create(book) 43 | .assertNext(b -> { 44 | assertEquals("Book One",b.getBookInfo().getTitle()); 45 | assertEquals(2,b.getReviews().size()); 46 | }) 47 | .verifyComplete(); 48 | } 49 | } -------------------------------------------------------------------------------- /src/test/java/com/dailycodebuffer/reactiveprogramming/services/FluxAndMonoServicesTest.java: -------------------------------------------------------------------------------- 1 | package com.dailycodebuffer.reactiveprogramming.services; 2 | 3 | import org.junit.jupiter.api.Test; 4 | import reactor.core.publisher.Hooks; 5 | import reactor.test.StepVerifier; 6 | import reactor.tools.agent.ReactorDebugAgent; 7 | 8 | import static org.junit.jupiter.api.Assertions.*; 9 | 10 | class FluxAndMonoServicesTest { 11 | 12 | FluxAndMonoServices fluxAndMonoServices 13 | = new FluxAndMonoServices(); 14 | 15 | @Test 16 | void fruitsFlux() { 17 | var fruitsFlux = fluxAndMonoServices.fruitsFlux(); 18 | 19 | StepVerifier.create(fruitsFlux) 20 | .expectNext("Mango","Orange","Banana") 21 | .verifyComplete(); 22 | } 23 | 24 | @Test 25 | void fruitMono() { 26 | var fruitsMono = fluxAndMonoServices.fruitMono(); 27 | 28 | StepVerifier.create(fruitsMono) 29 | .expectNext("Mango") 30 | .verifyComplete(); 31 | } 32 | 33 | @Test 34 | void fruitsFluxMap() { 35 | var fruitsFlux = fluxAndMonoServices.fruitsFluxMap(); 36 | 37 | StepVerifier.create(fruitsFlux) 38 | .expectNext("MANGO","ORANGE","BANANA") 39 | .verifyComplete(); 40 | } 41 | 42 | @Test 43 | void fruitsFluxFilter() { 44 | var fruitsFlux = fluxAndMonoServices.fruitsFluxFilter(5).log(); 45 | 46 | StepVerifier.create(fruitsFlux) 47 | .expectNext("Orange","Banana") 48 | .verifyComplete(); 49 | } 50 | 51 | @Test 52 | void fruitsFluxFilterMap() { 53 | var fruitsFlux = fluxAndMonoServices.fruitsFluxFilterMap(5); 54 | 55 | StepVerifier.create(fruitsFlux) 56 | .expectNext("ORANGE","BANANA") 57 | .verifyComplete(); 58 | } 59 | 60 | @Test 61 | void fruitsFluxFlatMap() { 62 | var fruitsFlux = fluxAndMonoServices.fruitsFluxFlatMap(); 63 | 64 | StepVerifier.create(fruitsFlux) 65 | .expectNextCount(17) 66 | .verifyComplete(); 67 | } 68 | 69 | @Test 70 | void fruitsFluxFlatMapAsync() { 71 | var fruitsFlux = fluxAndMonoServices.fruitsFluxFlatMapAsync(); 72 | 73 | StepVerifier.create(fruitsFlux) 74 | .expectNextCount(17) 75 | .verifyComplete(); 76 | } 77 | 78 | @Test 79 | void fruitMonoFlatMap() { 80 | var fruitsFlux = fluxAndMonoServices.fruitMonoFlatMap(); 81 | 82 | StepVerifier.create(fruitsFlux) 83 | .expectNextCount(1) 84 | .verifyComplete(); 85 | } 86 | 87 | @Test 88 | void fruitsFluxConcatMap() { 89 | 90 | var fruitsFlux = fluxAndMonoServices.fruitsFluxConcatMap(); 91 | 92 | StepVerifier.create(fruitsFlux) 93 | .expectNextCount(17) 94 | .verifyComplete(); 95 | } 96 | 97 | @Test 98 | void fruitMonoFlatMapMany() { 99 | var fruitsFlux = fluxAndMonoServices.fruitMonoFlatMapMany(); 100 | 101 | StepVerifier.create(fruitsFlux) 102 | .expectNextCount(5) 103 | .verifyComplete(); 104 | } 105 | 106 | @Test 107 | void fruitsFluxTransform() { 108 | 109 | var fruitsFlux 110 | = fluxAndMonoServices.fruitsFluxTransform(10); 111 | 112 | StepVerifier.create(fruitsFlux) 113 | .expectNext("Orange","Banana") 114 | .verifyComplete(); 115 | } 116 | 117 | @Test 118 | void fruitsFluxTransformDefaultIfEmpty() { 119 | var fruitsFlux 120 | = fluxAndMonoServices.fruitsFluxTransformDefaultIfEmpty(10); 121 | 122 | StepVerifier.create(fruitsFlux) 123 | .expectNext("Default") 124 | .verifyComplete(); 125 | } 126 | 127 | @Test 128 | void fruitsFluxTransformSwitchIfEmpty() { 129 | var fruitsFlux 130 | = fluxAndMonoServices.fruitsFluxTransformSwitchIfEmpty(8); 131 | 132 | StepVerifier.create(fruitsFlux) 133 | .expectNext("Pineapple","Jack Fruit") 134 | .verifyComplete(); 135 | 136 | } 137 | 138 | @Test 139 | void fruitsFluxConcat() { 140 | 141 | var fruitsFlux = fluxAndMonoServices.fruitsFluxConcat().log(); 142 | StepVerifier.create(fruitsFlux) 143 | .expectNext("Mango","Orange","Tomato","Lemon") 144 | .verifyComplete(); 145 | } 146 | 147 | @Test 148 | void fruitsFluxConcatWith() { 149 | var fruitsFlux = fluxAndMonoServices.fruitsFluxConcatWith().log(); 150 | StepVerifier.create(fruitsFlux) 151 | .expectNext("Mango","Orange","Tomato","Lemon") 152 | .verifyComplete(); 153 | } 154 | 155 | @Test 156 | void fruitsMonoConcatWith() { 157 | 158 | var fruitsFlux = fluxAndMonoServices.fruitsMonoConcatWith().log(); 159 | StepVerifier.create(fruitsFlux) 160 | .expectNext("Mango","Tomato") 161 | .verifyComplete(); 162 | } 163 | 164 | @Test 165 | void fruitsFluxMerge() { 166 | var fruitsFlux = fluxAndMonoServices.fruitsFluxMerge().log(); 167 | StepVerifier.create(fruitsFlux) 168 | .expectNext("Mango","Tomato","Orange","Lemon") 169 | .verifyComplete(); 170 | } 171 | 172 | @Test 173 | void fruitsFluxMergeWith() { 174 | var fruitsFlux = fluxAndMonoServices.fruitsFluxMergeWith().log(); 175 | StepVerifier.create(fruitsFlux) 176 | .expectNext("Mango","Tomato","Orange","Lemon") 177 | .verifyComplete(); 178 | } 179 | 180 | @Test 181 | void fruitsFluxMergeWithSequential() { 182 | var fruitsFlux = fluxAndMonoServices 183 | .fruitsFluxMergeWithSequential().log(); 184 | StepVerifier.create(fruitsFlux) 185 | .expectNext("Mango","Orange","Tomato","Lemon") 186 | .verifyComplete(); 187 | } 188 | 189 | @Test 190 | void fruitsFluxZip() { 191 | var fruitsFlux = fluxAndMonoServices 192 | .fruitsFluxZip().log(); 193 | StepVerifier.create(fruitsFlux) 194 | .expectNext("MangoTomato","OrangeLemon") 195 | .verifyComplete(); 196 | } 197 | 198 | @Test 199 | void fruitsFluxZipWith() { 200 | var fruitsFlux = fluxAndMonoServices 201 | .fruitsFluxZipWith().log(); 202 | StepVerifier.create(fruitsFlux) 203 | .expectNext("MangoTomato","OrangeLemon") 204 | .verifyComplete(); 205 | } 206 | 207 | @Test 208 | void fruitsFluxZipTuple() { 209 | var fruitsFlux = fluxAndMonoServices 210 | .fruitsFluxZipTuple().log(); 211 | StepVerifier.create(fruitsFlux) 212 | .expectNext("MangoTomatoPotato","OrangeLemonBeans") 213 | .verifyComplete(); 214 | } 215 | 216 | @Test 217 | void fruitsMonoZipWith() { 218 | 219 | var fruitsFlux = fluxAndMonoServices 220 | .fruitsMonoZipWith().log(); 221 | StepVerifier.create(fruitsFlux) 222 | .expectNext("MangoTomato") 223 | .verifyComplete(); 224 | } 225 | 226 | @Test 227 | void fruitsFluxFilterDoOn() { 228 | var fruitsFlux = fluxAndMonoServices 229 | .fruitsFluxFilterDoOn(5).log(); 230 | 231 | StepVerifier.create(fruitsFlux) 232 | .expectNext("Orange","Banana") 233 | .verifyComplete(); 234 | } 235 | 236 | @Test 237 | void fruitsFluxOnErrorReturn() { 238 | var fruitsFlux = fluxAndMonoServices 239 | .fruitsFluxOnErrorReturn().log(); 240 | 241 | StepVerifier.create(fruitsFlux) 242 | .expectNext("Apple","Mango","Orange") 243 | .verifyComplete(); 244 | } 245 | 246 | @Test 247 | void fruitsFluxOnErrorContinue() { 248 | var fruitsFlux = fluxAndMonoServices 249 | .fruitsFluxOnErrorContinue().log(); 250 | 251 | StepVerifier.create(fruitsFlux) 252 | .expectNext("APPLE","ORANGE") 253 | .verifyComplete(); 254 | } 255 | 256 | @Test 257 | void fruitsFluxOnErrorMap() { 258 | //Hooks.onOperatorDebug(); 259 | ReactorDebugAgent.init(); 260 | ReactorDebugAgent.processExistingClasses(); 261 | var fruitsFlux = fluxAndMonoServices 262 | .fruitsFluxOnErrorMap().log(); 263 | 264 | StepVerifier.create(fruitsFlux) 265 | .expectNext("APPLE") 266 | .expectError(IllegalStateException.class) 267 | .verify(); 268 | } 269 | 270 | @Test 271 | void fruitsFluxOnError() { 272 | var fruitsFlux = fluxAndMonoServices 273 | .fruitsFluxOnError().log(); 274 | 275 | StepVerifier.create(fruitsFlux) 276 | .expectNext("APPLE") 277 | .expectError(RuntimeException.class) 278 | .verify(); 279 | } 280 | } --------------------------------------------------------------------------------