tomcat 7 源码分析-10 线程池ThreadPoolExecutor

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本文介绍了Tomcat中线程池ThreadPoolExecutor的工作原理及其封装方式。通过分析源码，展示了如何利用线程池来处理客户端请求，提高服务器响应效率。

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tomcat 7 源码分析-10 线程池ThreadPoolExecutor

tomcat开启socket的accept线程后，其实要做的主要工作是交给worker线程去完成的，这其中使用了线程池的技术。

如：

Java代码

try {
SocketWrapper<Socket> wrapper = new SocketWrapper<Socket>(socket);
wrapper.setKeepAliveLeft(getMaxKeepAliveRequests());
getExecutor().execute(new SocketProcessor(wrapper));
}

try {
            SocketWrapper<Socket> wrapper = new SocketWrapper<Socket>(socket);
            wrapper.setKeepAliveLeft(getMaxKeepAliveRequests());
            getExecutor().execute(new SocketProcessor(wrapper));
        }

事实上tomcat对ThreadPoolExecutor做了一点小小的封装。

先来看一个简单的java api——ThreadPoolExecutor的使用

Java代码

package com.test.threadpool;
import java.util.concurrent.*;
public class ThreadpoolTest {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
int minSpareThreads = 10 ;
int maxThreads = 200 ;
LinkedBlockingQueue<Runnable> workQueue = new LinkedBlockingQueue<Runnable>();
ThreadPoolExecutor executor = new ThreadPoolExecutor(minSpareThreads, maxThreads, 60 , TimeUnit.SECONDS,workQueue);
for ( int i = 0 ; i <= 5 ; i++) { //创建6个任务
executor.execute(createTask(i));
}
executor.shutdown();
}
private static Runnable createTask( final int taskID) {
return new Runnable() {
public void run() {
System.out.println("Task" + taskID + "开始" );
System.out.println("Hello world" );
System.out.println("Task" + taskID + "结束" );
}
};
}
}

package com.test.threadpool;
import java.util.concurrent.*;
public class ThreadpoolTest {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		int minSpareThreads = 10;
		int maxThreads = 200;
		LinkedBlockingQueue<Runnable> workQueue = new LinkedBlockingQueue<Runnable>();
		ThreadPoolExecutor executor = new ThreadPoolExecutor(minSpareThreads, maxThreads, 60, TimeUnit.SECONDS,workQueue);
		for (int i = 0; i <=5 ; i++) { //创建6个任务  
			executor.execute(createTask(i)); 
			}  
		
		executor.shutdown();
	}
	
	     private static Runnable createTask(final int taskID) {  
		         return new Runnable() {  
		             public void run() {  
		               System.out.println("Task" + taskID + "开始");  
		               System.out.println("Hello world");  
		               System.out.println("Task" + taskID + "结束");  
		             }  
		         };  
		     }

}

所要执行的任务，只要是Runnable，然后交给executor执行，显得很简单。

tomcat对其封装在package org.apache.tomcat.util.threads中，可以看看