Java 詳解循環(huán)屏障CyclicBarrier如何實(shí)現(xiàn)多線程分段等待執(zhí)行完成

第Java詳解循環(huán)屏障CyclicBarrier如何實(shí)現(xiàn)多線程分段等待執(zhí)行完成工作中是否有這樣的場景，多個(gè)線程任務(wù)，如果所有線程完成到某個(gè)階段，你希望知道所有線程均完成該階段。當(dāng)然你使用線程計(jì)數(shù)可以實(shí)現(xiàn)，只是不夠優(yōu)雅。

所以我即：Java多線程等待優(yōu)雅的實(shí)現(xiàn)方式之Phaser同步屏障

之后再提供一個(gè)循環(huán)屏障，CyclicBarrier，更優(yōu)雅的實(shí)現(xiàn)工具。

Maven依賴

可以依賴，也可以不依賴，只是代碼要稍微多一些，最好添加。

dependency

groupIdjectlombok/groupId

artifactIdlombok/artifactId

optionaltrue/optional

/dependency

dependency

groupIdcn.hutool/groupId

artifactIdhutool-all/artifactId

version5.7.15/version

/dependency

不廢話，上代碼。

packagecom.huyi.csdn.tools;

importcn.hutool.core.thread.ThreadUtil;

importlombok.Getter;

importlombok.Setter;

importjava.text.MessageFormat;

importjava.util.ArrayList;

importjava.util.List;

importjava.util.Random;

importjava.util.concurrent.*;

*@Program:csdn@ClassName:CyclicBarrierUtil@Author:huyi@Date:2025-11-0717:09@Description:

*循環(huán)屏障工具@Version:V1.0

publicclassCyclicBarrierUtil{

publicstaticfinalExecutorServiceexecutorService=Executors.newFixedThreadPool(50);

@Getter

@Setter

publicstaticclassSegmentedTask{

privateRunnablestart;

privateRunnablemiddle;

privateRunnableend;

publicSegmentedTask(Runnablestart,Runnablemiddle,Runnableend){

this.start=start;

this.middle=middle;

this.end=end;

*提交任務(wù)

*@paramtasks參數(shù)

publicstaticvoidsubmit(ListSegmentedTasktasks){

CyclicBarriercyclicBarrier=newCyclicBarrier(tasks.size()+1);

try{

tasks.forEach(

x-{

executorService.submit(

()-{

try{

x.getStart().run();

cyclicBarrier.await();

x.getMiddle().run();

cyclicBarrier.await();

x.getEnd().run();

cyclicBarrier.await();

}catch(InterruptedException|BrokenBarrierExceptione){

e.printStackTrace();

cyclicBarrier.await();

System.out.println("初始任務(wù)已經(jīng)全部完成");

cyclicBarrier.await();

System.out.println("中間任務(wù)已經(jīng)全部完成");

cyclicBarrier.await();

System.out.println("最終任務(wù)已經(jīng)全部完成");

}catch(InterruptedException|BrokenBarrierExceptione){

e.printStackTrace();

publicstaticvoiddestroy(){

System.out.println("摧毀線程池");

executorService.shutdown();

}

代碼說明

1、構(gòu)造了一個(gè)分段任務(wù)實(shí)體類，成員有3段Runnable。

2、不同段的Runnable完成后會等待其他線程完成該段任務(wù)。

驗(yàn)證代碼

publicstaticvoidmain(String[]args){

Randomrandom=newRandom();

ListSegmentedTasktasks=newArrayList();

for(inti=1;ii++){

intfinalI=i;

tasks.add(

newSegmentedTask(

()-{

ThreadUtil.sleep(random.nextInt(10),TimeUnit.SECONDS);

System.out.println(

Thread.currentThread()+":"+MessageFormat.format("第{0}軍團(tuán)已經(jīng)開始推進(jìn)！",finalI));

()-{

ThreadUtil.sleep(random.nextInt(10),TimeUnit.SECONDS);

System.out.println(

Thread.currentThread()+":"+MessageFormat.format("第{0}軍團(tuán)已經(jīng)正在進(jìn)攻！",finalI));

()-{

ThreadUtil.sleep(random.nextInt(10),TimeUnit.SECONDS);

System.out.println(

Thread.currentThread()+":"+MessageFormat.format("第{0}軍團(tuán)已經(jīng)攻陷陣地！",finalI));

}));

CyclicBarrierUtil.submit(tasks);

ThreadUtil.sleep(35,TimeUnit.SECONDS);

CyclicBarrierUtil.destroy();

}

驗(yàn)證結(jié)果

E:\Java\jdk1.8.0_40\bin\java.exe"-javaagent:E:\ProgramFiles\JetBrains\IntelliJIDEA2025.1.1\lib\idea_rt.jar=5831:E:\ProgramFiles\JetBrains\IntelliJIDEA2025.1.1\bin"-Dfile.encoding=UTF-8-classpathE:\Java\jdk1.8.0_40\jre\lib\charsets.jar;E:\Java\jdk1.8.0_40\jre\lib\deploy.jar;E:\Java\jdk1.8.0_40\jre\lib\ext\access-bridge-64.jar;E:\Java\jdk1.8.0_40\jre\lib\ext\cldrdata.jar;E:\Java\jdk1.8.0_40\jre\lib\ext\dnsns.jar;E:\Java\jdk1.8.0_40\jre\lib\ext\jaccess.jar;E:\Java\jdk1.8.0_40\jre\lib\ext\jfxrt.jar;E:\Java\jdk1.8.0_40\jre\lib\ext\localedata.jar;E:\Java\jdk1.8.0_40\jre\lib\ext\nashorn.jar;E:\Java\jdk1.8.0_40\jre\lib\ext\sunec.jar;E:\Java\jdk1.8.0_40\jre\lib\ext\sunjce_provider.jar;E:\Java\jdk1.8.0_40\jre\lib\ext\sunmscapi.jar;E:\Java\jdk1.8.0_40\jre\lib\ext\sunpkcs11.jar;E:\Java\jdk1.8.0_40\jre\lib\ext\zipfs.jar;E:\Java\jdk1.8.0_40\jre\lib\javaws.jar;E:\Java\jdk1.8.0_40\jre\lib\jce.jar;E:\Java\jdk1.8.0_40\jre\lib\jfr.jar;E:\Java\jdk1.8.0_40\jre\lib\jfxswt.jar;E:\Java\jdk1.8.0_40\jre\lib\jsse.jar;E:\Java\jdk1.8.0_40\jre\lib\management-agent.jar;E:\Java\jdk1.8.0_40\jre\lib\plugin.jar;E:\Java\jdk1.8.0_40\jre\lib\resources.jar;E:\Java\jdk1.8.0_40\jre\lib\rt.jar;C:\Users\yi\IdeaProjects\csdn\target\classes;C:\Users\yi\.m2\repository\org\springframework\boot\spring-boot-starter-web\2.5.6\spring-boot-starter-web-2.5.6.jar;C:\Users\yi\.m2\repository\org\springframework\boot\spring-boot-starter\2.5.6\spring-boot-starter-2.5.6.jar;C:\Users\yi\.m2\repository\org\springframework\boot\spring-boot-starter-logging\2.5.6\spring-boot-starter-logging-2.5.6.jar;C:\Users\yi\.m2\repository\ch\qos\logback\logback-classic\1.2.6\logback-classic-1.2.6.jar;C:\Users\yi\.m2\repository\ch\qos\logback\logback-core\1.2.6\logback-core-1.2.6.jar;C:\Users\yi\.m2\repository\org\apache\logging\log4j\log4j-to-slf4j\2.14.1\log4j-to-slf4j-2.14.1.jar;C:\Users\yi\.m2\repository\org\apache\logging\log4j\log4j-api\2.14.1\log4j-api-2.14.1.jar;C:\Users\yi\.m2\repository\org\slf4j\jul-to-slf4j\1.7.32\jul-to-slf4j-1.7.32.jar;C:\Users\yi\.m2\repository\jakarta\annotation\jakarta.annotation-api\1.3.5\jakarta.annotation-api-1.3.5.jar;C:\Users\yi\.m2\repository\org\yaml\snakeyaml\1.28\snakeyaml-1.28.jar;C:\Users\yi\.m2\repository\org\springframework\boot\spring-boot-starter-json\2.5.6\spring-boot-starter-json-2.5.6.jar;C:\Users\yi\.m2\repository\com\fasterxml\jackson\core\jackson-databind\2.12.5\jackson-databind-2.12.5.jar;C:\Users\yi\.m2\repository\com\fasterxml\jackson\core\jackson-annotations\2.12.5\jackson-annotations-2.12.5.jar;C:\Users\yi\.m2\repository\com\fasterxml\jackson\core\jackson-core\2.12.5\jackson-core-2.12.5.jar;C:\Users\yi\.m2\repository\com\fasterxml\jackson\datatype\jackson-datatype-jdk8\2.12.5\jackson-datatype-jdk8-2.12.5.jar;C:\Users\yi\.m2\repository\com\fasterxml\jackson\datatype\jackson-datatype-jsr310\2.12.5\jackson-datatype-jsr310-2.12.5.jar;C:\Users\yi\.m2\repository\com\fasterxml\jackson\module\jackson-module-parameter-names\2.12.5\jackson-module-parameter-names-2.12.5.jar;C:\Users\yi\.m2\repository\org\springframework\boot\spring-boot-starter-tomcat\2.5.6\spring-boot-starter-tomcat-2.5.6.jar;C:\Users\yi\.m2\repository\org\apache\tomcat\embed\tomcat-embed-core\9.0.54\tomcat-embed-core-9.0.54.jar;C:\Users\yi\.m2\repository\org\apache\tomcat\embed\tomcat-embed-el\9.0.54\tomcat-embed-el-9.0.54.jar;C:\Users\yi\.m2\repository\org\apache\tomcat\embed\tomcat-embed-websocket\9.0.54\tomcat-embed-websocket-9.0.54.jar;C:\Users\yi\.m2\repository\org\springframework\spring-web\5.3.12\spring-web-5.3.12.jar;C:\Users\yi\.m2\repository\org\springframework\spring-beans\5.3.12\spring-beans-5.3.12.jar;C:\Users\yi\.m2\repository\org\springframework\spring-webmvc\5.3.12\spring-webmvc-5.3.12.jar;C:\Users\yi\.m2\repository\org\springframework\spring-aop\5.3.12\spring-aop-5.3.12.jar;C:\Users\yi\.m2\repository\org\springframework\spring-context\5.3.12\spring-context-5.3.12.jar;C:\Users\yi\.m2\repository\org\springframework\spring-expression\5.3.12\spring-expression-5.3.12.jar;C:\Users\yi\.m2\repository\org\springframework\boot\spring-boot-devtools\2.5.6\spring-boot-devtools-2.5.6.jar;C:\Users\yi\.m2\repository\org\springframework\boot\spring-boot\2.5.6\spring-boot-2.5.6.jar;C:\Users\yi\.m2\repository\org\springframework\boot\spring-boot-autoconfigure\2.5.6\spring-boot-autoconfigure-2.5.6.jar;C:\Users\yi\.m2\repository\org\springframework\boot\spring-boot-configuration-processor\2.5.6\spring-boot-configuration-processor-2.5.6.jar;C:\Users\yi\.m2\repository\org\projectlombok\lombok\1.18.22\lombok-1.18.22.jar;C:\Users\yi\.m2\repository\org\slf4j\slf4j-api\1.7.32\slf4j-api-1.7.32.jar;C:\Users\yi\.m2\repository\org\springframework\spring-core\5.3.12\spring-core-5.3.12.jar;C:\Users\yi\.m2\repository\org\springframework\spring-jcl\5.3.12\spring-jcl-5.3.12.jar;C:\Users\yi\.m2\repository\cn\hutool\hutool-all\5.7.15\hutool-all-5.7.15.jar;C:\Users\yi\.m2\repository\com\google\guava\guava\31.0.1-jre\guava-31.0.1-jre.jar;C:\Users\yi\.m2\repository\com\google\guava\failureaccess\1.0.1\failureaccess-1.0.1.jar;C:\Users\yi\.m2\repository\com\google\guava\listenablefuture\9999.0-empty-to-avoid-conflict-with-guava\listenablefuture-9999.0-empty-to-avoid-conflict-with-guava.jar;C:\Users\yi\.m2\repository\com\google\code\findbugs\jsr305\3.0.2\jsr305-3.0.2.jar;C:\Users\yi\.m2\repository\org\checkerframework\checker-qual\3.12.0\checker-qual-3.12.0.jar;C:\Users\yi\.m2\repository\com\google\errorprone\error_prone_annotations\2.7.1\error_prone_annotations-2.7.1.jar;C:\Users\yi\.m2\repository\com\google\j2objc\j2objc-annotations\1.3\j2objc-annotations-1.3.jarcom.huyi.csdn.tools.CyclicBarrierUtil

Thread[pool-1-thread-9,5,main]:第9軍團(tuán)已經(jīng)開始推進(jìn)！

Thread[pool-1-thread-10,5,main]:第10軍團(tuán)已經(jīng)開始推進(jìn)！

Thread[pool-1-thread-8,5,main]:第8軍團(tuán)已經(jīng)開始推進(jìn)！

Thread[pool-1-thread-3,5,main]:第3軍團(tuán)已經(jīng)開始推進(jìn)！

Thread[pool-1-thread-7,5,main]:第7軍團(tuán)已經(jīng)開始推進(jìn)！

Thread[pool-1-thread-5,5,main]:第5軍團(tuán)已經(jīng)開始推進(jìn)！

Thread[pool-1-thread-6,5,main]:第6軍團(tuán)已經(jīng)開始推進(jìn)！

Thread[pool-1-thread-4,5,main]:第4軍團(tuán)已經(jīng)開始推進(jìn)！

Thread[pool-1-thread-1,5,main]:第1軍團(tuán)已經(jīng)開始推進(jìn)！

Thread[pool-1-thread-2,5,main]:第2軍團(tuán)已經(jīng)開始推進(jìn)！

初始任務(wù)已經(jīng)全部完成

Thread[pool-1-thread-4,5,main]:第4軍團(tuán)已經(jīng)正在進(jìn)攻！

Thread[pool-1-thread-6,5,main]:第6軍團(tuán)已經(jīng)正在進(jìn)攻！

Thread[pool-1-thread-5,5,main]:第5軍團(tuán)已經(jīng)正在進(jìn)攻！

Thread[pool-1-thread-8,5,main]:第8軍團(tuán)已經(jīng)正在進(jìn)攻！

Thread[pool-1-thread-7,5,main]:第7軍團(tuán)已經(jīng)正在進(jìn)攻！

Thread[pool-1-thread-9,5,main]:第9軍團(tuán)已經(jīng)正在進(jìn)攻！