分布式锁

spring-boot-lock/.gitignore

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+HELP.md
+/target/
+!.mvn/wrapper/maven-wrapper.jar
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+/build/

spring-boot-lock/.mvn/wrapper/MavenWrapperDownloader.java

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+/*
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements. See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership. The ASF licenses this file
+to you under the Apache License, Version 2.0 (the
+"License"); you may not use this file except in compliance
+with the License. You may obtain a copy of the License at
+
+ http:https://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing,
+software distributed under the License is distributed on an
+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, either express or implied. See the License for the
+specific language governing permissions and limitations
+under the License.
+*/
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.net.URL;
+import java.nio.channels.Channels;
+import java.nio.channels.ReadableByteChannel;
+import java.util.Properties;
+
+public class MavenWrapperDownloader {
+
+ /**
+ * Default URL to download the maven-wrapper.jar from, if no 'downloadUrl' is provided.
+ */
+ private static final String DEFAULT_DOWNLOAD_URL =
+ "https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/0.4.2/maven-wrapper-0.4.2.jar";
+
+ /**
+ * Path to the maven-wrapper.properties file, which might contain a downloadUrl property to
+ * use instead of the default one.
+ */
+ private static final String MAVEN_WRAPPER_PROPERTIES_PATH =
+ ".mvn/wrapper/maven-wrapper.properties";
+
+ /**
+ * Path where the maven-wrapper.jar will be saved to.
+ */
+ private static final String MAVEN_WRAPPER_JAR_PATH =
+ ".mvn/wrapper/maven-wrapper.jar";
+
+ /**
+ * Name of the property which should be used to override the default download url for the wrapper.
+ */
+ private static final String PROPERTY_NAME_WRAPPER_URL = "wrapperUrl";
+
+ public static void main(String args[]) {
+ System.out.println("- Downloader started");
+ File baseDirectory = new File(args[0]);
+ System.out.println("- Using base directory: " + baseDirectory.getAbsolutePath());
+
+ // If the maven-wrapper.properties exists, read it and check if it contains a custom
+ // wrapperUrl parameter.
+ File mavenWrapperPropertyFile = new File(baseDirectory, MAVEN_WRAPPER_PROPERTIES_PATH);
+ String url = DEFAULT_DOWNLOAD_URL;
+ if (mavenWrapperPropertyFile.exists()) {
+ FileInputStream mavenWrapperPropertyFileInputStream = null;
+ try {
+ mavenWrapperPropertyFileInputStream = new FileInputStream(mavenWrapperPropertyFile);
+ Properties mavenWrapperProperties = new Properties();
+ mavenWrapperProperties.load(mavenWrapperPropertyFileInputStream);
+ url = mavenWrapperProperties.getProperty(PROPERTY_NAME_WRAPPER_URL, url);
+ } catch (IOException e) {
+ System.out.println("- ERROR loading '" + MAVEN_WRAPPER_PROPERTIES_PATH + "'");
+ } finally {
+ try {
+ if (mavenWrapperPropertyFileInputStream != null) {
+ mavenWrapperPropertyFileInputStream.close();
+ }
+ } catch (IOException e) {
+ // Ignore ...
+ }
+ }
+ }
+ System.out.println("- Downloading from: : " + url);
+
+ File outputFile = new File(baseDirectory.getAbsolutePath(), MAVEN_WRAPPER_JAR_PATH);
+ if (!outputFile.getParentFile().exists()) {
+ if (!outputFile.getParentFile().mkdirs()) {
+ System.out.println(
+ "- ERROR creating output direcrory '" + outputFile.getParentFile().getAbsolutePath() + "'");
+ }
+ }
+ System.out.println("- Downloading to: " + outputFile.getAbsolutePath());
+ try {
+ downloadFileFromURL(url, outputFile);
+ System.out.println("Done");
+ System.exit(0);
+ } catch (Throwable e) {
+ System.out.println("- Error downloading");
+ e.printStackTrace();
+ System.exit(1);
+ }
+ }
+
+ private static void downloadFileFromURL(String urlString, File destination) throws Exception {
+ URL website = new URL(urlString);
+ ReadableByteChannel rbc;
+ rbc = Channels.newChannel(website.openStream());
+ FileOutputStream fos = new FileOutputStream(destination);
+ fos.getChannel().transferFrom(rbc, 0, Long.MAX_VALUE);
+ fos.close();
+ rbc.close();
+ }
+
+}

spring-boot-lock/.mvn/wrapper/maven-wrapper.properties

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+distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.6.0/apache-maven-3.6.0-bin.zip

spring-boot-lock/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http:https://maven.apache.org/POM/4.0.0" xmlns:xsi="http:https://www.w3.org/2001/XMLSchema-instance"
+ xsi:schemaLocation="http:https://maven.apache.org/POM/4.0.0 http:https://maven.apache.org/xsd/maven-4.0.0.xsd">
+ <modelVersion>4.0.0</modelVersion>
+ <parent>
+ <groupId>org.springframework.boot</groupId>
+ <artifactId>spring-boot-starter-parent</artifactId>
+ <version>2.1.3.RELEASE</version>
+ <relativePath/> <!-- lookup parent from repository -->
+ </parent>
+ <groupId>com.itmuch</groupId>
+ <artifactId>spring-boot-lock</artifactId>
+ <version>0.0.1-SNAPSHOT</version>
+ <name>spring-boot-lock</name>
+ <description>分布锁演示</description>
+
+ <properties>
+ <java.version>1.8</java.version>
+ </properties>
+
+ <dependencies>
+ <dependency>
+ <groupId>org.springframework.boot</groupId>
+ <artifactId>spring-boot-starter-web</artifactId>
+ </dependency>
+ <dependency>
+ <groupId>org.springframework.boot</groupId>
+ <artifactId>spring-boot-starter-integration</artifactId>
+ </dependency>
+ <dependency>
+ <groupId>org.springframework.integration</groupId>
+ <artifactId>spring-integration-redis</artifactId>
+ </dependency>
+ <dependency>
+ <groupId>org.springframework.boot</groupId>
+ <artifactId>spring-boot-starter-data-redis</artifactId>
+ </dependency>
+
+ <dependency>
+ <groupId>org.projectlombok</groupId>
+ <artifactId>lombok</artifactId>
+ <optional>true</optional>
+ </dependency>
+ </dependencies>
+
+ <build>
+ <plugins>
+ <plugin>
+ <groupId>org.springframework.boot</groupId>
+ <artifactId>spring-boot-maven-plugin</artifactId>
+ </plugin>
+ </plugins>
+ </build>
+
+</project>

spring-boot-lock/src/main/java/com/itmuch/lock/RedisLockConfiguration.java

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+package com.itmuch.lock;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.data.redis.connection.RedisConnectionFactory;
+import org.springframework.integration.redis.util.RedisLockRegistry;
+
+/**
+ * @author itmuch.com
+ */
+@Configuration
+public class RedisLockConfiguration {
+ @Bean
+ public RedisLockRegistry redisLockRegistry(RedisConnectionFactory redisConnectionFactory) {
+ return new RedisLockRegistry(redisConnectionFactory, "spring-cloud", 5000L);
+ }
+}

spring-boot-lock/src/main/java/com/itmuch/lock/SpringBootLockApplication.java

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+package com.itmuch.lock;
+
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.integration.redis.util.RedisLockRegistry;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.locks.Lock;
+
+@Slf4j
+@SpringBootApplication
+@RestController
+public class SpringBootLockApplication {
+ @Autowired
+ private RedisLockRegistry redisLockRegistry;
+
+ @GetMapping("test")
+ public void test() throws InterruptedException {
+ Lock lock = redisLockRegistry.obtain("lock");
+ boolean b1 = lock.tryLock(3, TimeUnit.SECONDS);
+ log.info("b1 is : {}", b1);
+
+ TimeUnit.SECONDS.sleep(5);
+
+ boolean b2 = lock.tryLock(3, TimeUnit.SECONDS);
+ log.info("b2 is : {}", b2);
+
+ lock.unlock();
+ lock.unlock();
+ }
+
+ public static void main(String[] args) {
+ SpringApplication.run(SpringBootLockApplication.class, args);
+ }
+
+}

spring-boot-lock/src/main/resources/application.yml

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+spring:
+ redis:
+ port: 6379
+ host: localhost
+server:
+ port: 8083