ThreadPoolExecutor自定义创建线程池使用有界队列

  在使用有界队列时，若有新的任务需要执行，如果线程池实际线程数小于corePoolSize，则优先创建线程，
  若大于corePoolSize，则会将任务加入队列，
  若队列已满，则在总线程数不大于maximumPoolSize的前提下，创建新的线程，

  若线程数大于maximumPoolSize，则执行拒绝策略。或其他自定义方式。

import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.ThreadPoolExecutor.DiscardOldestPolicy;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.ThreadPoolExecutor.CallerRunsPolicy;



public class UseThreadPoolExecutor1 {


   public static void main(String[] args) {
      /**
       * 在使用有界队列时，若有新的任务需要执行，如果线程池实际线程数小于corePoolSize，则优先创建线程，
       * 若大于corePoolSize，则会将任务加入队列，
       * 若队列已满，则在总线程数不大于maximumPoolSize的前提下，创建新的线程，
       * 若线程数大于maximumPoolSize，则执行拒绝策略。或其他自定义方式。
       * 
       */    
      ThreadPoolExecutor pool = new ThreadPoolExecutor(
            2,              //coreSize
            3,              //MaxSize
            60,          //60
            TimeUnit.SECONDS, 
//          new ArrayBlockingQueue(2)          //指定一种队列 （有界队列）
            new LinkedBlockingQueue()
            , new MyRejected()
            //, new DiscardOldestPolicy()
            );
      
      MyTask mt1 = new MyTask(1, "任务1");
      MyTask mt2 = new MyTask(2, "任务2");
      MyTask mt3 = new MyTask(3, "任务3");
      MyTask mt4 = new MyTask(4, "任务4");
      MyTask mt5 = new MyTask(5, "任务5");
      MyTask mt6 = new MyTask(6, "任务6");
      
      pool.execute(mt1);
      pool.execute(mt2);
      pool.execute(mt3);
      pool.execute(mt4);
      pool.execute(mt5);
      pool.execute(mt6);
      
      pool.shutdown();
   }
}

public class MyTask implements Runnable {

   private int taskId;
   private String taskName;
   
   public MyTask(int taskId, String taskName){
      this.taskId = taskId;
      this.taskName = taskName;
   }
   
   public int getTaskId() {
      return taskId;
   }

   public void setTaskId(int taskId) {
      this.taskId = taskId;
   }

   public String getTaskName() {
      return taskName;
   }

   public void setTaskName(String taskName) {
      this.taskName = taskName;
   }

   @Override
   public void run() {
      try {
         System.out.println("run taskId =" + this.taskId+"，Thread1"+Thread.currentThread().getName());
         Thread.sleep(5*1000);
         //System.out.println("end taskId =" + this.taskId);
      } catch (InterruptedException e) {
         e.printStackTrace();
      }     
   }
   
   public String toString(){
      return Integer.toString(this.taskId);
   }

}

import java.net.HttpURLConnection;
import java.util.concurrent.RejectedExecutionHandler;
import java.util.concurrent.ThreadPoolExecutor;

public class MyRejected implements RejectedExecutionHandler{

   
   public MyRejected(){
   }
   
   @Override
   public void rejectedExecution(Runnable r, ThreadPoolExecutor executor) {
      System.out.println("自定义处理..");
      System.out.println("当前被拒绝任务为：" + r.toString());
      

   }

}

import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;

public class UseThreadPoolExecutor2 implements Runnable{

   private static AtomicInteger count = new AtomicInteger(0);
   
   @Override
   public void run() {
      try {
         int temp = count.incrementAndGet();
         System.out.println("任务" + temp);
         Thread.sleep(2000);
      } catch (InterruptedException e) {
         e.printStackTrace();
      }
   }
   
   public static void main(String[] args) throws Exception{
      //System.out.println(Runtime.getRuntime().availableProcessors());
      BlockingQueue queue = 
//          new LinkedBlockingQueue();
            new ArrayBlockingQueue(12);
      ExecutorService executor  = new ThreadPoolExecutor(
               5,        //core
               6,     //max
               120L,  //2fenzhong
               TimeUnit.SECONDS,
               queue, new MyRejected());
      
      for(int i = 0 ; i < 20; i++){
         executor.execute(new UseThreadPoolExecutor2());
      }
      Thread.sleep(1000);
      System.out.println("queue size:" + queue.size());     //10
      Thread.sleep(2000);
   }
}