Java Thread - 如何避免并發(fā)執(zhí)行一個耗時的任務(wù)而不阻塞

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import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingDeque;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
public class Main {
  final int CPU_COUNT = 4;
  BlockingQueue<Runnable> lightTaskQueue = new LinkedBlockingDeque<Runnable>();
 
  ThreadPoolExecutor lightExecutor = new ThreadPoolExecutor(CPU_COUNT,
      CPU_COUNT, 60L, TimeUnit.SECONDS, lightTaskQueue);
  
  BlockingQueue<Runnable> heavyTaskQueue = new LinkedBlockingDeque<Runnable>();
 
  ThreadPoolExecutor heavyExecutor = new ThreadPoolExecutor(1, 1, 60L,
      TimeUnit.SECONDS, heavyTaskQueue);
  
  static AtomicBoolean heavyTaskRunning = new AtomicBoolean();
  public void shutDownNow() {
    lightExecutor.shutdownNow();
    heavyExecutor.shutdownNow();
  }
  public void runOrQueueLightTask(SampleLightTask lightOne) {
    lightExecutor.execute(lightOne);
  }
  public void runOrQueueHeavyTask(SampleHeavyTask heavyOne) {
    if (heavyTaskRunning.get()) {
      System.out.println("running, skipped new one: " + heavyOne);
      return;
    }
    this.heavyExecutor.execute(heavyOne);
 
 
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