├── .gitignore ├── .mvn └── wrapper │ ├── MavenWrapperDownloader.java │ ├── maven-wrapper.jar │ └── maven-wrapper.properties ├── README.md ├── mvnw ├── mvnw.cmd ├── pom.xml └── src ├── main ├── java │ └── com │ │ └── cloud │ │ └── demo │ │ ├── SpringDemoApplication.java │ │ ├── annotation │ │ └── Retry.java │ │ ├── aspect │ │ └── RetryAspect.java │ │ ├── exceptiom │ │ └── RetryException.java │ │ ├── mapper │ │ └── AccountMapper.java │ │ ├── model │ │ └── Account.java │ │ └── service │ │ └── AccountService.java └── resources │ ├── application.yml │ └── mybatis │ └── mapper │ └── AccountMapper.xml └── test └── java └── com └── cloud └── demo ├── SpringDemoApplicationTests.java └── service └── AccountServiceTest.java /.gitignore: -------------------------------------------------------------------------------- 1 | HELP.md 2 | target/ 3 | !.mvn/wrapper/maven-wrapper.jar 4 | !**/src/main/** 5 | !**/src/test/** 6 | 7 | ### STS ### 8 | .apt_generated 9 | .classpath 10 | .factorypath 11 | .project 12 | .settings 13 | .springBeans 14 | .sts4-cache 15 | 16 | ### IntelliJ IDEA ### 17 | .idea 18 | *.iws 19 | *.iml 20 | *.ipr 21 | 22 | ### NetBeans ### 23 | /nbproject/private/ 24 | /nbbuild/ 25 | /dist/ 26 | /nbdist/ 27 | /.nb-gradle/ 28 | build/ 29 | 30 | ### VS Code ### 31 | .vscode/ 32 | -------------------------------------------------------------------------------- /.mvn/wrapper/MavenWrapperDownloader.java: -------------------------------------------------------------------------------- 1 | /* 2 | Licensed to the Apache Software Foundation (ASF) under one 3 | or more contributor license agreements. See the NOTICE file 4 | distributed with this work for additional information 5 | regarding copyright ownership. The ASF licenses this file 6 | to you under the Apache License, Version 2.0 (the 7 | "License"); you may not use this file except in compliance 8 | with the License. You may obtain a copy of the License at 9 | 10 | https://www.apache.org/licenses/LICENSE-2.0 11 | 12 | Unless required by applicable law or agreed to in writing, 13 | software distributed under the License is distributed on an 14 | "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 15 | KIND, either express or implied. See the License for the 16 | specific language governing permissions and limitations 17 | under the License. 18 | */ 19 | 20 | import java.io.File; 21 | import java.io.FileInputStream; 22 | import java.io.FileOutputStream; 23 | import java.io.IOException; 24 | import java.net.URL; 25 | import java.nio.channels.Channels; 26 | import java.nio.channels.ReadableByteChannel; 27 | import java.util.Properties; 28 | 29 | public class MavenWrapperDownloader { 30 | 31 | /** 32 | * Default URL to download the maven-wrapper.jar from, if no 'downloadUrl' is provided. 33 | */ 34 | private static final String DEFAULT_DOWNLOAD_URL = 35 | "https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/0.4.2/maven-wrapper-0.4.2.jar"; 36 | 37 | /** 38 | * Path to the maven-wrapper.properties file, which might contain a downloadUrl property to 39 | * use instead of the default one. 40 | */ 41 | private static final String MAVEN_WRAPPER_PROPERTIES_PATH = 42 | ".mvn/wrapper/maven-wrapper.properties"; 43 | 44 | /** 45 | * Path where the maven-wrapper.jar will be saved to. 46 | */ 47 | private static final String MAVEN_WRAPPER_JAR_PATH = 48 | ".mvn/wrapper/maven-wrapper.jar"; 49 | 50 | /** 51 | * Name of the property which should be used to override the default download url for the wrapper. 52 | */ 53 | private static final String PROPERTY_NAME_WRAPPER_URL = "wrapperUrl"; 54 | 55 | public static void main(String args[]) { 56 | System.out.println("- Downloader started"); 57 | File baseDirectory = new File(args[0]); 58 | System.out.println("- Using base directory: " + baseDirectory.getAbsolutePath()); 59 | 60 | // If the maven-wrapper.properties exists, read it and check if it contains a custom 61 | // wrapperUrl parameter. 62 | File mavenWrapperPropertyFile = new File(baseDirectory, MAVEN_WRAPPER_PROPERTIES_PATH); 63 | String url = DEFAULT_DOWNLOAD_URL; 64 | if (mavenWrapperPropertyFile.exists()) { 65 | FileInputStream mavenWrapperPropertyFileInputStream = null; 66 | try { 67 | mavenWrapperPropertyFileInputStream = new FileInputStream(mavenWrapperPropertyFile); 68 | Properties mavenWrapperProperties = new Properties(); 69 | mavenWrapperProperties.load(mavenWrapperPropertyFileInputStream); 70 | url = mavenWrapperProperties.getProperty(PROPERTY_NAME_WRAPPER_URL, url); 71 | } catch (IOException e) { 72 | System.out.println("- ERROR loading '" + MAVEN_WRAPPER_PROPERTIES_PATH + "'"); 73 | } finally { 74 | try { 75 | if (mavenWrapperPropertyFileInputStream != null) { 76 | mavenWrapperPropertyFileInputStream.close(); 77 | } 78 | } catch (IOException e) { 79 | // Ignore ... 80 | } 81 | } 82 | } 83 | System.out.println("- Downloading from: : " + url); 84 | 85 | File outputFile = new File(baseDirectory.getAbsolutePath(), MAVEN_WRAPPER_JAR_PATH); 86 | if (!outputFile.getParentFile().exists()) { 87 | if (!outputFile.getParentFile().mkdirs()) { 88 | System.out.println( 89 | "- ERROR creating output direcrory '" + outputFile.getParentFile().getAbsolutePath() + "'"); 90 | } 91 | } 92 | System.out.println("- Downloading to: " + outputFile.getAbsolutePath()); 93 | try { 94 | downloadFileFromURL(url, outputFile); 95 | System.out.println("Done"); 96 | System.exit(0); 97 | } catch (Throwable e) { 98 | System.out.println("- Error downloading"); 99 | e.printStackTrace(); 100 | System.exit(1); 101 | } 102 | } 103 | 104 | private static void downloadFileFromURL(String urlString, File destination) throws Exception { 105 | URL website = new URL(urlString); 106 | ReadableByteChannel rbc; 107 | rbc = Channels.newChannel(website.openStream()); 108 | FileOutputStream fos = new FileOutputStream(destination); 109 | fos.getChannel().transferFrom(rbc, 0, Long.MAX_VALUE); 110 | fos.close(); 111 | rbc.close(); 112 | } 113 | 114 | } 115 | -------------------------------------------------------------------------------- /.mvn/wrapper/maven-wrapper.jar: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/ifyun/Lock_Demo/15d4ac861b901e827e9cc36f89d0ba2b1652c9d0/.mvn/wrapper/maven-wrapper.jar -------------------------------------------------------------------------------- /.mvn/wrapper/maven-wrapper.properties: -------------------------------------------------------------------------------- 1 | distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.6.0/apache-maven-3.6.0-bin.zip 2 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # 乐观锁和悲观锁 2 | 3 | 使用 Spring Boot 和 Mybatis 实现乐观锁和悲观锁。 -------------------------------------------------------------------------------- /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 | # Maven2 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 "$JAVA_HOME"; pwd)`" 117 | # TODO classpath? 118 | fi 119 | 120 | if [ -z "$JAVA_HOME" ]; then 121 | javaExecutable="`which javac`" 122 | if [ -n "$javaExecutable" ] && ! [ "`expr \"$javaExecutable\" : '\([^ ]*\)'`" = "no" ]; then 123 | # readlink(1) is not available as standard on Solaris 10. 124 | readLink=`which readlink` 125 | if [ ! `expr "$readLink" : '\([^ ]*\)'` = "no" ]; then 126 | if $darwin ; then 127 | javaHome="`dirname \"$javaExecutable\"`" 128 | javaExecutable="`cd \"$javaHome\" && pwd -P`/javac" 129 | else 130 | javaExecutable="`readlink -f \"$javaExecutable\"`" 131 | fi 132 | javaHome="`dirname \"$javaExecutable\"`" 133 | javaHome=`expr "$javaHome" : '\(.*\)/bin'` 134 | JAVA_HOME="$javaHome" 135 | export JAVA_HOME 136 | fi 137 | fi 138 | fi 139 | 140 | if [ -z "$JAVACMD" ] ; then 141 | if [ -n "$JAVA_HOME" ] ; then 142 | if [ -x "$JAVA_HOME/jre/sh/java" ] ; then 143 | # IBM's JDK on AIX uses strange locations for the executables 144 | JAVACMD="$JAVA_HOME/jre/sh/java" 145 | else 146 | JAVACMD="$JAVA_HOME/bin/java" 147 | fi 148 | else 149 | JAVACMD="`which java`" 150 | fi 151 | fi 152 | 153 | if [ ! -x "$JAVACMD" ] ; then 154 | echo "Error: JAVA_HOME is not defined correctly." >&2 155 | echo " We cannot execute $JAVACMD" >&2 156 | exit 1 157 | fi 158 | 159 | if [ -z "$JAVA_HOME" ] ; then 160 | echo "Warning: JAVA_HOME environment variable is not set." 161 | fi 162 | 163 | CLASSWORLDS_LAUNCHER=org.codehaus.plexus.classworlds.launcher.Launcher 164 | 165 | # traverses directory structure from process work directory to filesystem root 166 | # first directory with .mvn subdirectory is considered project base directory 167 | find_maven_basedir() { 168 | 169 | if [ -z "$1" ] 170 | then 171 | echo "Path not specified to find_maven_basedir" 172 | return 1 173 | fi 174 | 175 | basedir="$1" 176 | wdir="$1" 177 | while [ "$wdir" != '/' ] ; do 178 | if [ -d "$wdir"/.mvn ] ; then 179 | basedir=$wdir 180 | break 181 | fi 182 | # workaround for JBEAP-8937 (on Solaris 10/Sparc) 183 | if [ -d "${wdir}" ]; then 184 | wdir=`cd "$wdir/.."; pwd` 185 | fi 186 | # end of workaround 187 | done 188 | echo "${basedir}" 189 | } 190 | 191 | # concatenates all lines of a file 192 | concat_lines() { 193 | if [ -f "$1" ]; then 194 | echo "$(tr -s '\n' ' ' < "$1")" 195 | fi 196 | } 197 | 198 | BASE_DIR=`find_maven_basedir "$(pwd)"` 199 | if [ -z "$BASE_DIR" ]; then 200 | exit 1; 201 | fi 202 | 203 | ########################################################################################## 204 | # Extension to allow automatically downloading the maven-wrapper.jar from Maven-central 205 | # This allows using the maven wrapper in projects that prohibit checking in binary data. 206 | ########################################################################################## 207 | if [ -r "$BASE_DIR/.mvn/wrapper/maven-wrapper.jar" ]; then 208 | if [ "$MVNW_VERBOSE" = true ]; then 209 | echo "Found .mvn/wrapper/maven-wrapper.jar" 210 | fi 211 | else 212 | if [ "$MVNW_VERBOSE" = true ]; then 213 | echo "Couldn't find .mvn/wrapper/maven-wrapper.jar, downloading it ..." 214 | fi 215 | jarUrl="https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/0.4.2/maven-wrapper-0.4.2.jar" 216 | while IFS="=" read key value; do 217 | case "$key" in (wrapperUrl) jarUrl="$value"; break ;; 218 | esac 219 | done < "$BASE_DIR/.mvn/wrapper/maven-wrapper.properties" 220 | if [ "$MVNW_VERBOSE" = true ]; then 221 | echo "Downloading from: $jarUrl" 222 | fi 223 | wrapperJarPath="$BASE_DIR/.mvn/wrapper/maven-wrapper.jar" 224 | 225 | if command -v wget > /dev/null; then 226 | if [ "$MVNW_VERBOSE" = true ]; then 227 | echo "Found wget ... using wget" 228 | fi 229 | wget "$jarUrl" -O "$wrapperJarPath" 230 | elif command -v curl > /dev/null; then 231 | if [ "$MVNW_VERBOSE" = true ]; then 232 | echo "Found curl ... using curl" 233 | fi 234 | curl -o "$wrapperJarPath" "$jarUrl" 235 | else 236 | if [ "$MVNW_VERBOSE" = true ]; then 237 | echo "Falling back to using Java to download" 238 | fi 239 | javaClass="$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.java" 240 | if [ -e "$javaClass" ]; then 241 | if [ ! -e "$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.class" ]; then 242 | if [ "$MVNW_VERBOSE" = true ]; then 243 | echo " - Compiling MavenWrapperDownloader.java ..." 244 | fi 245 | # Compiling the Java class 246 | ("$JAVA_HOME/bin/javac" "$javaClass") 247 | fi 248 | if [ -e "$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.class" ]; then 249 | # Running the downloader 250 | if [ "$MVNW_VERBOSE" = true ]; then 251 | echo " - Running MavenWrapperDownloader.java ..." 252 | fi 253 | ("$JAVA_HOME/bin/java" -cp .mvn/wrapper MavenWrapperDownloader "$MAVEN_PROJECTBASEDIR") 254 | fi 255 | fi 256 | fi 257 | fi 258 | ########################################################################################## 259 | # End of extension 260 | ########################################################################################## 261 | 262 | export MAVEN_PROJECTBASEDIR=${MAVEN_BASEDIR:-"$BASE_DIR"} 263 | if [ "$MVNW_VERBOSE" = true ]; then 264 | echo $MAVEN_PROJECTBASEDIR 265 | fi 266 | MAVEN_OPTS="$(concat_lines "$MAVEN_PROJECTBASEDIR/.mvn/jvm.config") $MAVEN_OPTS" 267 | 268 | # For Cygwin, switch paths to Windows format before running java 269 | if $cygwin; then 270 | [ -n "$M2_HOME" ] && 271 | M2_HOME=`cygpath --path --windows "$M2_HOME"` 272 | [ -n "$JAVA_HOME" ] && 273 | JAVA_HOME=`cygpath --path --windows "$JAVA_HOME"` 274 | [ -n "$CLASSPATH" ] && 275 | CLASSPATH=`cygpath --path --windows "$CLASSPATH"` 276 | [ -n "$MAVEN_PROJECTBASEDIR" ] && 277 | MAVEN_PROJECTBASEDIR=`cygpath --path --windows "$MAVEN_PROJECTBASEDIR"` 278 | fi 279 | 280 | WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain 281 | 282 | exec "$JAVACMD" \ 283 | $MAVEN_OPTS \ 284 | -classpath "$MAVEN_PROJECTBASEDIR/.mvn/wrapper/maven-wrapper.jar" \ 285 | "-Dmaven.home=${M2_HOME}" "-Dmaven.multiModuleProjectDirectory=${MAVEN_PROJECTBASEDIR}" \ 286 | ${WRAPPER_LAUNCHER} $MAVEN_CONFIG "$@" 287 | -------------------------------------------------------------------------------- /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 Maven2 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 key stroke 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 my 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/0.4.2/maven-wrapper-0.4.2.jar" 124 | FOR /F "tokens=1,2 delims==" %%A IN (%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.properties) DO ( 125 | IF "%%A"=="wrapperUrl" SET DOWNLOAD_URL=%%B 126 | ) 127 | 128 | @REM Extension to allow automatically downloading the maven-wrapper.jar from Maven-central 129 | @REM This allows using the maven wrapper in projects that prohibit checking in binary data. 130 | if exist %WRAPPER_JAR% ( 131 | echo Found %WRAPPER_JAR% 132 | ) else ( 133 | echo Couldn't find %WRAPPER_JAR%, downloading it ... 134 | echo Downloading from: %DOWNLOAD_URL% 135 | powershell -Command "(New-Object Net.WebClient).DownloadFile('%DOWNLOAD_URL%', '%WRAPPER_JAR%')" 136 | echo Finished downloading %WRAPPER_JAR% 137 | ) 138 | @REM End of extension 139 | 140 | %MAVEN_JAVA_EXE% %JVM_CONFIG_MAVEN_PROPS% %MAVEN_OPTS% %MAVEN_DEBUG_OPTS% -classpath %WRAPPER_JAR% "-Dmaven.multiModuleProjectDirectory=%MAVEN_PROJECTBASEDIR%" %WRAPPER_LAUNCHER% %MAVEN_CONFIG% %* 141 | if ERRORLEVEL 1 goto error 142 | goto end 143 | 144 | :error 145 | set ERROR_CODE=1 146 | 147 | :end 148 | @endlocal & set ERROR_CODE=%ERROR_CODE% 149 | 150 | if not "%MAVEN_SKIP_RC%" == "" goto skipRcPost 151 | @REM check for post script, once with legacy .bat ending and once with .cmd ending 152 | if exist "%HOME%\mavenrc_post.bat" call "%HOME%\mavenrc_post.bat" 153 | if exist "%HOME%\mavenrc_post.cmd" call "%HOME%\mavenrc_post.cmd" 154 | :skipRcPost 155 | 156 | @REM pause the script if MAVEN_BATCH_PAUSE is set to 'on' 157 | if "%MAVEN_BATCH_PAUSE%" == "on" pause 158 | 159 | if "%MAVEN_TERMINATE_CMD%" == "on" exit %ERROR_CODE% 160 | 161 | exit /B %ERROR_CODE% 162 | -------------------------------------------------------------------------------- /pom.xml: -------------------------------------------------------------------------------- 1 | 2 | 4 | 4.0.0 5 | 6 | org.springframework.boot 7 | spring-boot-starter-parent 8 | 2.1.7.RELEASE 9 | 10 | 11 | com.cloud.demo 12 | lock-demo 13 | 1.0.0 14 | Lock Demo 15 | Demo project for Database Lock 16 | 17 | 18 | 1.8 19 | 20 | 21 | 22 | 23 | org.springframework.boot 24 | spring-boot-starter-web 25 | 26 | 27 | org.mybatis.spring.boot 28 | mybatis-spring-boot-starter 29 | 2.1.0 30 | 31 | 32 | org.springframework.boot 33 | spring-boot-starter-aop 34 | 35 | 36 | org.springframework.boot 37 | spring-boot-devtools 38 | runtime 39 | true 40 | 41 | 42 | mysql 43 | mysql-connector-java 44 | runtime 45 | 46 | 47 | org.springframework.boot 48 | spring-boot-starter-test 49 | test 50 | 51 | 52 | org.junit.jupiter 53 | junit-jupiter 54 | RELEASE 55 | test 56 | 57 | 58 | org.projectlombok 59 | lombok 60 | true 61 | 62 | 63 | 64 | 65 | 66 | 67 | org.springframework.boot 68 | spring-boot-maven-plugin 69 | 70 | 71 | 72 | 73 | 74 | -------------------------------------------------------------------------------- /src/main/java/com/cloud/demo/SpringDemoApplication.java: -------------------------------------------------------------------------------- 1 | package com.cloud.demo; 2 | 3 | import org.mybatis.spring.annotation.MapperScan; 4 | import org.springframework.boot.SpringApplication; 5 | import org.springframework.boot.autoconfigure.SpringBootApplication; 6 | import org.springframework.transaction.annotation.EnableTransactionManagement; 7 | 8 | @SpringBootApplication 9 | @MapperScan("com.cloud.demo.mapper") 10 | @EnableTransactionManagement 11 | public class SpringDemoApplication { 12 | 13 | public static void main(String[] args) { 14 | SpringApplication.run(SpringDemoApplication.class, args); 15 | } 16 | 17 | } 18 | -------------------------------------------------------------------------------- /src/main/java/com/cloud/demo/annotation/Retry.java: -------------------------------------------------------------------------------- 1 | package com.cloud.demo.annotation; 2 | 3 | import java.lang.annotation.ElementType; 4 | import java.lang.annotation.Retention; 5 | import java.lang.annotation.RetentionPolicy; 6 | import java.lang.annotation.Target; 7 | 8 | @Retention(RetentionPolicy.RUNTIME) 9 | @Target(ElementType.METHOD) 10 | public @interface Retry { 11 | int value() default 3; // 重试次数 12 | } 13 | -------------------------------------------------------------------------------- /src/main/java/com/cloud/demo/aspect/RetryAspect.java: -------------------------------------------------------------------------------- 1 | package com.cloud.demo.aspect; 2 | 3 | import com.cloud.demo.annotation.Retry; 4 | import com.cloud.demo.exceptiom.RetryException; 5 | import com.cloud.demo.service.AccountService; 6 | import lombok.extern.slf4j.Slf4j; 7 | import org.aspectj.lang.ProceedingJoinPoint; 8 | import org.aspectj.lang.annotation.Around; 9 | import org.aspectj.lang.annotation.Aspect; 10 | import org.aspectj.lang.annotation.Pointcut; 11 | import org.springframework.stereotype.Component; 12 | import org.springframework.transaction.annotation.Isolation; 13 | import org.springframework.transaction.annotation.Transactional; 14 | import org.springframework.transaction.interceptor.TransactionAspectSupport; 15 | 16 | @Slf4j 17 | @Aspect 18 | @Component 19 | public class RetryAspect { 20 | 21 | @Pointcut("@annotation(com.cloud.demo.annotation.Retry)") 22 | public void retryPointcut() { 23 | 24 | } 25 | 26 | @Around("retryPointcut() && @annotation(retry)") 27 | @Transactional(isolation = Isolation.READ_COMMITTED) 28 | public Object tryAgain(ProceedingJoinPoint joinPoint, Retry retry) throws Throwable { 29 | int count = 0; 30 | do { 31 | count++; 32 | try { 33 | return joinPoint.proceed(); 34 | } catch (RetryException e) { 35 | if (count > retry.value()) { 36 | log.error("Retry failed!"); 37 | TransactionAspectSupport.currentTransactionStatus().setRollbackOnly(); 38 | return AccountService.Result.FAILED; 39 | } 40 | } 41 | } while (true); 42 | } 43 | } 44 | -------------------------------------------------------------------------------- /src/main/java/com/cloud/demo/exceptiom/RetryException.java: -------------------------------------------------------------------------------- 1 | package com.cloud.demo.exceptiom; 2 | 3 | public class RetryException extends RuntimeException { 4 | public RetryException(String message) { 5 | super(message); 6 | } 7 | } 8 | -------------------------------------------------------------------------------- /src/main/java/com/cloud/demo/mapper/AccountMapper.java: -------------------------------------------------------------------------------- 1 | package com.cloud.demo.mapper; 2 | 3 | import com.cloud.demo.model.Account; 4 | import org.springframework.stereotype.Component; 5 | 6 | import java.math.BigDecimal; 7 | 8 | @Component 9 | public interface AccountMapper { 10 | Account selectById(int id); 11 | Account selectByIdForUpdate(int id); 12 | int updateDepositWithVersion(Account account); 13 | void updateDeposit(Account account); 14 | BigDecimal getTotalDeposit(); 15 | } 16 | -------------------------------------------------------------------------------- /src/main/java/com/cloud/demo/model/Account.java: -------------------------------------------------------------------------------- 1 | package com.cloud.demo.model; 2 | 3 | import lombok.Data; 4 | 5 | import java.math.BigDecimal; 6 | 7 | @Data 8 | public class Account { 9 | private int id; 10 | private BigDecimal deposit; 11 | private int version; 12 | } 13 | -------------------------------------------------------------------------------- /src/main/java/com/cloud/demo/service/AccountService.java: -------------------------------------------------------------------------------- 1 | package com.cloud.demo.service; 2 | 3 | import com.cloud.demo.annotation.Retry; 4 | import com.cloud.demo.exceptiom.RetryException; 5 | import com.cloud.demo.mapper.AccountMapper; 6 | import com.cloud.demo.model.Account; 7 | import lombok.extern.slf4j.Slf4j; 8 | import org.springframework.stereotype.Service; 9 | import org.springframework.transaction.annotation.Isolation; 10 | import org.springframework.transaction.annotation.Transactional; 11 | import org.springframework.transaction.interceptor.TransactionAspectSupport; 12 | 13 | import javax.annotation.Resource; 14 | import java.math.BigDecimal; 15 | import java.util.function.BiPredicate; 16 | 17 | @Slf4j 18 | @Service 19 | public class AccountService { 20 | 21 | public enum Result{ 22 | SUCCESS, 23 | DEPOSIT_NOT_ENOUGH, 24 | FAILED, 25 | } 26 | 27 | @Resource 28 | private AccountMapper accountMapper; 29 | 30 | private BiPredicate isDepositEnough = (deposit, value) -> deposit.compareTo(value) > 0; 31 | 32 | /** 33 | * 转账操作，悲观锁 34 | * 35 | * @param fromId 扣款账户 36 | * @param toId 收款账户 37 | * @param value 金额 38 | */ 39 | @Transactional(isolation = Isolation.READ_COMMITTED) 40 | public Result transferPessimistic(int fromId, int toId, BigDecimal value) { 41 | Account from, to; 42 | 43 | try { 44 | // 先锁 id 较大的那行，避免死锁 45 | if (fromId > toId) { 46 | from = accountMapper.selectByIdForUpdate(fromId); 47 | to = accountMapper.selectByIdForUpdate(toId); 48 | } else { 49 | to = accountMapper.selectByIdForUpdate(toId); 50 | from = accountMapper.selectByIdForUpdate(fromId); 51 | } 52 | } catch (Exception e) { 53 | log.error(e.getMessage()); 54 | TransactionAspectSupport.currentTransactionStatus().setRollbackOnly(); 55 | return Result.FAILED; 56 | } 57 | 58 | if (!isDepositEnough.test(from.getDeposit(), value)) { 59 | TransactionAspectSupport.currentTransactionStatus().setRollbackOnly(); 60 | log.info(String.format("Account %d is not enough.", fromId)); 61 | return Result.DEPOSIT_NOT_ENOUGH; 62 | } 63 | 64 | from.setDeposit(from.getDeposit().subtract(value)); 65 | to.setDeposit(to.getDeposit().add(value)); 66 | 67 | accountMapper.updateDeposit(from); 68 | accountMapper.updateDeposit(to); 69 | 70 | return Result.SUCCESS; 71 | } 72 | 73 | /** 74 | * 转账操作，乐观锁 75 | * @param fromId 扣款账户 76 | * @param toId 收款账户 77 | * @param value 金额 78 | */ 79 | @Retry 80 | @Transactional(isolation = Isolation.REPEATABLE_READ) 81 | public Result transferOptimistic(int fromId, int toId, BigDecimal value) { 82 | Account from = accountMapper.selectById(fromId), 83 | to = accountMapper.selectById(toId); 84 | 85 | if (!isDepositEnough.test(from.getDeposit(), value)) { 86 | TransactionAspectSupport.currentTransactionStatus().setRollbackOnly(); 87 | return Result.DEPOSIT_NOT_ENOUGH; 88 | } 89 | 90 | from.setDeposit(from.getDeposit().subtract(value)); 91 | to.setDeposit(to.getDeposit().add(value)); 92 | 93 | int r1, r2; 94 | 95 | // 先锁 id 较大的那行，避免死锁 96 | if (from.getId() > to.getId()) { 97 | r1 = accountMapper.updateDepositWithVersion(from); 98 | r2 = accountMapper.updateDepositWithVersion(to); 99 | } else { 100 | r2 = accountMapper.updateDepositWithVersion(to); 101 | r1 = accountMapper.updateDepositWithVersion(from); 102 | } 103 | 104 | if (r1 < 1 || r2 < 1) { 105 | // 失败，抛出重试异常，执行重试 106 | throw new RetryException("Transfer failed, retry."); 107 | } else { 108 | return Result.SUCCESS; 109 | } 110 | } 111 | } 112 | -------------------------------------------------------------------------------- /src/main/resources/application.yml: -------------------------------------------------------------------------------- 1 | spring: 2 | datasource: 3 | url: jdbc:mysql://localhost:3306/vault 4 | username: root 5 | password: root 6 | hikari: 7 | maximum-pool-size: 500 8 | minimum-idle: 50 9 | idle-timeout: 60000 10 | connection-timeout: 60000 11 | validation-timeout: 3000 12 | driver-class-name: com.mysql.cj.jdbc.Driver 13 | mybatis: 14 | mapper-locations: classpath:mybatis/mapper/*.xml 15 | configuration: 16 | map-underscore-to-camel-case: true -------------------------------------------------------------------------------- /src/main/resources/mybatis/mapper/AccountMapper.xml: -------------------------------------------------------------------------------- 1 | 2 | 4 | 5 | 10 | 11 | update account 12 | set deposit=#{deposit}, 13 | version = version + 1 14 | where id = #{id} 15 | and version = #{version} 16 | 17 | 23 | 24 | update account 25 | set deposit=#{deposit} 26 | where id = #{id} 27 | 28 | 31 | -------------------------------------------------------------------------------- /src/test/java/com/cloud/demo/SpringDemoApplicationTests.java: -------------------------------------------------------------------------------- 1 | package com.cloud.demo; 2 | 3 | import org.junit.Test; 4 | import org.junit.runner.RunWith; 5 | import org.springframework.boot.test.context.SpringBootTest; 6 | import org.springframework.test.context.junit4.SpringRunner; 7 | 8 | @RunWith(SpringRunner.class) 9 | @SpringBootTest 10 | public class SpringDemoApplicationTests { 11 | 12 | @Test 13 | public void contextLoads() { 14 | } 15 | 16 | } 17 | -------------------------------------------------------------------------------- /src/test/java/com/cloud/demo/service/AccountServiceTest.java: -------------------------------------------------------------------------------- 1 | package com.cloud.demo.service; 2 | 3 | import com.cloud.demo.mapper.AccountMapper; 4 | import javafx.util.Pair; 5 | import lombok.extern.slf4j.Slf4j; 6 | import org.junit.jupiter.api.Assertions; 7 | import org.junit.jupiter.api.BeforeEach; 8 | import org.junit.jupiter.api.Test; 9 | import org.junit.runner.RunWith; 10 | import org.springframework.boot.test.context.SpringBootTest; 11 | import org.springframework.test.context.junit4.SpringRunner; 12 | 13 | import javax.annotation.Resource; 14 | 15 | import java.math.BigDecimal; 16 | import java.math.RoundingMode; 17 | import java.util.ArrayList; 18 | import java.util.List; 19 | import java.util.Random; 20 | import java.util.concurrent.CountDownLatch; 21 | 22 | import static java.lang.System.currentTimeMillis; 23 | 24 | @Slf4j 25 | @SpringBootTest 26 | @RunWith(SpringRunner.class) 27 | class AccountServiceTest { 28 | 29 | // 并发数 30 | private static final int COUNT = 500; 31 | 32 | @Resource 33 | AccountMapper accountMapper; 34 | 35 | @Resource 36 | AccountService accountService; 37 | 38 | private CountDownLatch latch = new CountDownLatch(COUNT); 39 | private List transferThreads = new ArrayList<>(); 40 | private List> transferAccounts = new ArrayList<>(); 41 | 42 | @BeforeEach 43 | void setUp() { 44 | Random random = new Random(currentTimeMillis()); 45 | transferThreads.clear(); 46 | transferAccounts.clear(); 47 | 48 | for (int i = 0; i < COUNT; i++) { 49 | int from = random.nextInt(10) + 1; 50 | int to; 51 | do{ 52 | to = random.nextInt(10) + 1; 53 | } while (from == to); 54 | transferAccounts.add(new Pair<>(from, to)); 55 | } 56 | } 57 | 58 | /** 59 | * 测试悲观锁 60 | */ 61 | @Test 62 | void transferByPessimisticLock() throws Throwable { 63 | for (int i = 0; i < COUNT; i++) { 64 | transferThreads.add(new Transfer(i, true)); 65 | } 66 | for (Thread t : transferThreads) { 67 | t.start(); 68 | } 69 | latch.await(); 70 | 71 | Assertions.assertEquals(accountMapper.getTotalDeposit(), 72 | BigDecimal.valueOf(10000).setScale(2, RoundingMode.HALF_UP)); 73 | } 74 | 75 | /** 76 | * 测试乐观锁 77 | */ 78 | @Test 79 | void transferByOptimisticLock() throws Throwable { 80 | for (int i = 0; i < COUNT; i++) { 81 | transferThreads.add(new Transfer(i, false)); 82 | } 83 | for (Thread t : transferThreads) { 84 | t.start(); 85 | } 86 | latch.await(); 87 | 88 | Assertions.assertEquals(accountMapper.getTotalDeposit(), 89 | BigDecimal.valueOf(10000).setScale(2, RoundingMode.HALF_UP)); 90 | } 91 | 92 | /** 93 | * 转账线程 94 | */ 95 | class Transfer extends Thread { 96 | int index; 97 | boolean isPessimistic; 98 | 99 | Transfer(int i, boolean b) { 100 | index = i; 101 | isPessimistic = b; 102 | } 103 | 104 | @Override 105 | public void run() { 106 | BigDecimal value = BigDecimal.valueOf( 107 | new Random(currentTimeMillis()).nextFloat() * 100 108 | ).setScale(2, RoundingMode.HALF_UP); 109 | 110 | AccountService.Result result = AccountService.Result.FAILED; 111 | int fromId = transferAccounts.get(index).getKey(), 112 | toId = transferAccounts.get(index).getValue(); 113 | try { 114 | if (isPessimistic) { 115 | result = accountService.transferPessimistic(fromId, toId, value); 116 | } else { 117 | result = accountService.transferOptimistic(fromId, toId, value); 118 | } 119 | } catch (Exception e) { 120 | log.error(e.getMessage()); 121 | } finally { 122 | if (result == AccountService.Result.SUCCESS) { 123 | log.info(String.format("Transfer %f from %d to %d success", value, fromId, toId)); 124 | } 125 | latch.countDown(); 126 | } 127 | } 128 | } 129 | } --------------------------------------------------------------------------------