@Configuration
@EnableAsync
public class ThreadPoolTaskConfig {
 
    @Bean("threadPoolTaskExecutor")//自定義線程池名稱
    public ThreadPoolTaskExecutor threadPoolTaskExecutor() {
 
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
 
        //線程池創(chuàng)建的核心線程數(shù)，線程池維護(hù)線程的最少數(shù)量，即使沒(méi)有任務(wù)需要執(zhí)行，也會(huì)一直存活
        executor.setCorePoolSize(16);
 
        //如果設(shè)置allowCoreThreadTimeout=true（默認(rèn)false）時(shí)，核心線程會(huì)超時(shí)關(guān)閉
        //executor.setAllowCoreThreadTimeOut(true);
 
        //阻塞隊(duì)列 當(dāng)核心線程數(shù)達(dá)到最大時(shí)，新任務(wù)會(huì)放在隊(duì)列中排隊(duì)等待執(zhí)行
        executor.setQueueCapacity(124);
 
        //最大線程池?cái)?shù)量，當(dāng)線程數(shù)>=corePoolSize，且任務(wù)隊(duì)列已滿時(shí)。線程池會(huì)創(chuàng)建新線程來(lái)處理任務(wù)
        //任務(wù)隊(duì)列已滿時(shí), 且當(dāng)線程數(shù)=maxPoolSize，，線程池會(huì)拒絕處理任務(wù)而拋出異常
        executor.setMaxPoolSize(64);
 
        //當(dāng)線程空閑時(shí)間達(dá)到keepAliveTime時(shí)，線程會(huì)退出，直到線程數(shù)量=corePoolSize
        //允許線程空閑時(shí)間30秒，當(dāng)maxPoolSize的線程在空閑時(shí)間到達(dá)的時(shí)候銷毀
        //如果allowCoreThreadTimeout=true，則會(huì)直到線程數(shù)量=0
        executor.setKeepAliveSeconds(30);
 
        //spring 提供的 ThreadPoolTaskExecutor 線程池，是有setThreadNamePrefix() 方法的。
        //jdk 提供的ThreadPoolExecutor 線程池是沒(méi)有 setThreadNamePrefix() 方法的
        executor.setThreadNamePrefix("自定義線程池-");
 
        // rejection-policy：拒絕策略：當(dāng)線程數(shù)已經(jīng)達(dá)到maxSize的時(shí)候，如何處理新任務(wù)
        // CallerRunsPolicy()：交由調(diào)用方線程運(yùn)行，比如 main 線程；如果添加到線程池失敗，那么主線程會(huì)自己去執(zhí)行該任務(wù)，不會(huì)等待線程池中的線程去執(zhí)行, (個(gè)人推薦)
        // AbortPolicy()：該策略是線程池的默認(rèn)策略，如果線程池隊(duì)列滿了丟掉這個(gè)任務(wù)并且拋出RejectedExecutionException異常。
        // DiscardPolicy()：如果線程池隊(duì)列滿了，會(huì)直接丟掉這個(gè)任務(wù)并且不會(huì)有任何異常
        // DiscardOldestPolicy()：丟棄隊(duì)列中最老的任務(wù)，隊(duì)列滿了，會(huì)將最早進(jìn)入隊(duì)列的任務(wù)刪掉騰出空間，再嘗試加入隊(duì)列
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
 
        //設(shè)置線程池關(guān)閉的時(shí)候等待所有任務(wù)都完成再繼續(xù)銷毀其他的Bean，這樣這些異步任務(wù)的銷毀就會(huì)先于Redis線程池的銷毀
  executor.setWaitForTasksToCompleteOnShutdown(true);
  //設(shè)置線程池中任務(wù)的等待時(shí)間，如果超過(guò)這個(gè)時(shí)候還沒(méi)有銷毀就強(qiáng)制銷毀，以確保應(yīng)用最后能夠被關(guān)閉，而不是阻塞住。
  executor.setAwaitTerminationSeconds(60);
 
        executor.initialize();
        return executor;
    }
}

package com.example.anno;
 
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
 
/**
 * 多線程事務(wù)注解: 主事務(wù)
 */
@Target({ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
public @interface MainTransaction {
 int value();//子線程數(shù)量
}

package com.example.anno;
 
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
 
/**
 * 多線程事務(wù)注解: 子事務(wù)
 */
@Target({ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
public @interface SonTransaction {
    String value() default "";
}

package com.example.aop;
 
import com.baomidou.mybatisplus.core.toolkit.CollectionUtils;
import com.example.anno.MainTransaction;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.springframework.stereotype.Component;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.TransactionDefinition;
import org.springframework.transaction.TransactionStatus;
import org.springframework.transaction.support.DefaultTransactionDefinition;
 
import javax.annotation.Resource;
import java.util.HashMap;
import java.util.Map;
import java.util.Vector;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.atomic.AtomicBoolean;
 
/**
 * 多線程事務(wù)
 */
@Aspect
@Component
public class TransactionAop {
 
    //用來(lái)存儲(chǔ)各線程計(jì)數(shù)器數(shù)據(jù)(每次執(zhí)行后會(huì)從map中刪除)
 private static final Map<String, Object> map = new HashMap<>();
 
 @Resource
 private PlatformTransactionManager transactionManager;
 
 @Around("@annotation(mainTransaction)")
 public void mainIntercept(ProceedingJoinPoint joinPoint, MainTransaction mainTransaction) throws Throwable {
  //當(dāng)前線程名稱
  Thread thread = Thread.currentThread();
  String threadName = thread.getName();
  //初始化計(jì)數(shù)器
  CountDownLatch mainDownLatch = new CountDownLatch(1);
  CountDownLatch sonDownLatch = new CountDownLatch(mainTransaction.value());//@MainTransaction注解中的參數(shù), 為子線程的數(shù)量
  // 用來(lái)記錄子線程的運(yùn)行狀態(tài)，只要有一個(gè)失敗就變?yōu)閠rue
  AtomicBoolean rollBackFlag = new AtomicBoolean(false);
  // 用來(lái)存每個(gè)子線程的異常，把每個(gè)線程的自定義異常向vector的首位置插入，其余異常向末位置插入，避免線程不安全，所以使用vector代替list
  Vector<Throwable> exceptionVector = new Vector<>();
 
  map.put(threadName + "mainDownLatch", mainDownLatch);
  map.put(threadName + "sonDownLatch", sonDownLatch);
  map.put(threadName + "rollBackFlag", rollBackFlag);
  map.put(threadName + "exceptionVector", exceptionVector);
 
  try {
   joinPoint.proceed();//執(zhí)行方法
  } catch (Throwable e) {
   exceptionVector.add(0, e);
   rollBackFlag.set(true);//子線程回滾
   mainDownLatch.countDown();//放行所有子線程
  }
 
  if (!rollBackFlag.get()) {
   try {
    // sonDownLatch等待，直到所有子線程執(zhí)行完插入操作，但此時(shí)還沒(méi)有提交事務(wù)
    sonDownLatch.await();
    mainDownLatch.countDown();// 根據(jù)rollBackFlag狀態(tài)放行子線程的await處，告知是回滾還是提交
   } catch (Exception e) {
    rollBackFlag.set(true);
    exceptionVector.add(0, e);
   }
  }
  if (CollectionUtils.isNotEmpty(exceptionVector)) {
   map.remove(threadName + "mainDownLatch");
   map.remove(threadName + "sonDownLatch");
   map.remove(threadName + "rollBackFlag");
   map.remove(threadName + "exceptionVector");
   throw exceptionVector.get(0);
  }
 }
 
 @Around("@annotation(com.huigu.common.anno.SonTransaction)")
 public void sonIntercept(ProceedingJoinPoint joinPoint) throws Throwable {
  Object[] args = joinPoint.getArgs();
  Thread thread = (Thread) args[args.length - 1];
  String threadName = thread.getName();
  CountDownLatch mainDownLatch = (CountDownLatch) map.get(threadName + "mainDownLatch");
  if (mainDownLatch == null) {
   //主事務(wù)未加注解時(shí), 直接執(zhí)行子事務(wù)
   joinPoint.proceed();//這里最好的方式是:交由上面的thread來(lái)調(diào)用此方法,但我沒(méi)有找尋到對(duì)應(yīng)api,只能直接放棄事務(wù), 歡迎大神來(lái)優(yōu)化, 留言分享
   return;
  }
  CountDownLatch sonDownLatch = (CountDownLatch) map.get(threadName + "sonDownLatch");
  AtomicBoolean rollBackFlag = (AtomicBoolean) map.get(threadName + "rollBackFlag");
  Vector<Throwable> exceptionVector = (Vector<Throwable>) map.get(threadName + "exceptionVector");
 
  //如果這時(shí)有一個(gè)子線程已經(jīng)出錯(cuò)，那當(dāng)前線程不需要執(zhí)行
  if (rollBackFlag.get()) {
   sonDownLatch.countDown();
   return;
  }
 
  DefaultTransactionDefinition def = new DefaultTransactionDefinition();// 開(kāi)啟事務(wù)
  def.setPropagationBehavior(TransactionDefinition.PROPAGATION_REQUIRES_NEW);// 設(shè)置事務(wù)隔離級(jí)別
  TransactionStatus status = transactionManager.getTransaction(def);
 
  try {
   joinPoint.proceed();//執(zhí)行方法
 
   sonDownLatch.countDown();// 對(duì)sonDownLatch-1
   mainDownLatch.await();// 如果mainDownLatch不是0，線程會(huì)在此阻塞，直到mainDownLatch變?yōu)?
   // 如果能執(zhí)行到這一步說(shuō)明所有子線程都已經(jīng)執(zhí)行完畢判斷如果atomicBoolean是true就回滾false就提交
   if (rollBackFlag.get()) {
    transactionManager.rollback(status);
   } else {
    transactionManager.commit(status);
   }
  } catch (Throwable e) {
   exceptionVector.add(0, e);
   // 回滾
   transactionManager.rollback(status);
   // 并把狀態(tài)設(shè)置為true
   rollBackFlag.set(true);
   mainDownLatch.countDown();
   sonDownLatch.countDown();
  }
 }
}

package com.example.demo.service;
 
import com.example.demo.anno.SonTransaction;
import org.springframework.scheduling.annotation.Async;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
 
/**
 * 測(cè)試子service
 */
@Service
public class SonService {
 
    /**
     * 參數(shù)說(shuō)明:  以下4個(gè)方法參數(shù)和此相同
     *
     * @param args   業(yè)務(wù)中需要傳遞的參數(shù)
     * @param thread 調(diào)用者的線程, 用于aop獲取參數(shù), 不建議以方法重寫的方式簡(jiǎn)略此參數(shù),
     *               在調(diào)用者方法中可以以此參數(shù)為標(biāo)識(shí)計(jì)算子線程的個(gè)數(shù)作為注解參數(shù),避免線程參數(shù)計(jì)算錯(cuò)誤導(dǎo)致鎖表
     *               傳參時(shí)參數(shù)固定為: Thread.currentThread()
     */
    @Transactional(rollbackFor = Exception.class)
    @Async("threadPoolTaskExecutor")
    @SonTransaction
    public void sonMethod1(String args, Thread thread) {
        System.out.println(args + "開(kāi)啟了線程");
    }
 
    @Transactional(rollbackFor = Exception.class)
    @Async("threadPoolTaskExecutor")
    @SonTransaction
    public void sonMethod2(String args1, String args2, Thread thread) {
        System.out.println(args1 + "和" + args2 + "開(kāi)啟了線程");
    }
 
    @Transactional(rollbackFor = Exception.class)
    @Async("threadPoolTaskExecutor")
    @SonTransaction
    public void sonMethod3(String args, Thread thread) {
        System.out.println(args + "開(kāi)啟了線程");
    }
 
    //sonMethod4方法沒(méi)有使用線程池
    @Transactional(rollbackFor = Exception.class)
    public void sonMethod4(String args) {
        System.out.println(args + "沒(méi)有開(kāi)啟線程");
    }
}

package com.example.demo.service;
 
import com.example.demo.anno.MainTransaction;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
 
import javax.annotation.Resource;
 
/**
 * 測(cè)試主service
 */
@Service
public class MainService {
 
    @Resource
    private SonService sonService;
 
    @MainTransaction(3)//調(diào)用的方法中sonMethod1/sonMethod2/sonMethod3使用@Async開(kāi)啟了線程, 所以參數(shù)為: 3
    @Transactional(rollbackFor = Exception.class)
    public void test1() {
        sonService.sonMethod1("路飛", Thread.currentThread());
        sonService.sonMethod2("索隆", "山治", Thread.currentThread());
        sonService.sonMethod3("娜美", Thread.currentThread());
        sonService.sonMethod4("羅賓");
    }
 
    /*
     * 有的業(yè)務(wù)中存在if的多種可能, 每一種走向調(diào)用的方法(開(kāi)啟線程的方法)數(shù)量如果不同, 這時(shí)可以選擇放棄使用@MainTransaction注解避免鎖表
     * 這時(shí)候如果發(fā)生異常會(huì)導(dǎo)致多線程不能同時(shí)回滾, 可根據(jù)業(yè)務(wù)自己權(quán)衡是否使用
     */
    @Transactional(rollbackFor = Exception.class)
    public void test2() {
        sonService.sonMethod1("路飛", Thread.currentThread());
        sonService.sonMethod2("索隆", "山治", Thread.currentThread());
        sonService.sonMethod3("娜美", Thread.currentThread());
        sonService.sonMethod4("羅賓");
    }
 
}