java线程同步

标签：线程池   thread   线程同步   countdownlatch   

业务逻辑：

一个大型社区，每一秒有上千人在提交留言，提交的留言将经过，上万条的正则表达式的过滤，没有匹配任何规则的，才保存到系统，否则提示用户，您录入的内容不合法。

我是这样想的，把这上万条正则表达式，拆分成2000条一组，开一个5个线程的线程池，每个线程将负责其中2000个规则的匹配。

每条留言提交时，将由这5个线程，去判断是否有匹配的规则，如果其中一个线程匹配到了规则，将结束其他4个线程的任务，返回给用户结果。

==

代码：

import java.util.ArrayList;
import java.util.concurrent.CountDownLatch;


public class TestThread {
	/**
	 * @param args
	 * @throws InterruptedException 
	 */
	public static void main(String[] args) throws InterruptedException {
		
		String c = "评论1";
		TxtClass tx = new TxtClass(c);
		CountDownLatch cdLatch = new CountDownLatch(5);
        Thread tr = new CRThread(1,tx,cdLatch);//1表示第一个
        Thread tr2 = new CRThread(2,tx,cdLatch);
        Thread tr3 = new CRThread(3,tx,cdLatch);
        Thread tr4 = new CRThread(4,tx,cdLatch);
        Thread tr5 = new CRThread(5,tx,cdLatch);
        
        tr.start();
        tr2.start();
        tr3.start();
        tr4.start();
        tr5.start();
        cdLatch.await();        

		System.out.println("都执行完了，结果["+tx.isFind() + "]");
	}

}
class TxtClass{
	private String c = "";
	private boolean isFind = false;
	public TxtClass(String c){
		this.c = c;
	}
	public boolean isFind() {
		return isFind;
	}
	public void setFind(boolean isFind) {
		this.isFind = isFind;
	}
	public String getC() {
		return c;
	}
	
}
class RegClass{//校验规则
	private static RegClass rc = new RegClass();
	public static RegClass getInstance(){
		return rc;
	}
	private ArrayList<String> list = new ArrayList();
	public RegClass(){//初始化规则
		list.add("s");
		list.add("s");
		list.add("s");
		list.add("s");
		list.add("s");
		list.add("s");
		list.add("s");
		list.add("s");
		list.add("s");
		list.add("s");
		list.add("s");
		list.add("s");
		list.add("s");
		list.add("s");
		list.add("s");
		list.add("s");
		list.add("s");
		list.add("s");
		list.add("s");
		list.add("s");
		list.add("1");
		list.add("评");
		list.add("a");
		list.add("b");
		list.add("r");
	}
	public boolean isContains(int index,String c){
		if(list.size()>index){
			return c.indexOf(list.get(index))>=0;
		}else{
			return false;
		}
	}
}
class CRThread extends Thread{
	private int startNum = 0;
	private TxtClass txtClass;//留言内容
	private CountDownLatch cdLatch;
	private int oneLength = 2000;//一个线程校验的长度
	public CRThread(int i,TxtClass txtClass,CountDownLatch cdLatch){
		super();
		this.startNum = i;
		this.txtClass = txtClass;
		this.cdLatch = cdLatch;
	}
	@Override
	public void run() {
		boolean f = false;
		int nums = 0;
		for(int i=0;i<oneLength;i++){
			nums = (startNum-1)*oneLength+i;
			System.out.println("thread-"+startNum+"-["+nums+"]");
			f=RegClass.getInstance().isContains(nums, txtClass.getC());
			if(f){
				txtClass.setFind(true);
			}
			if(txtClass.isFind()){
				break;
			}
			try {
				Thread.sleep(1);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}
		System.out.println("thread-"+startNum+"-结束["+nums+"]");
		this.cdLatch.countDown();
	}
}

java线程同步

标签：线程池   thread   线程同步   countdownlatch   

原文地址：http://blog.csdn.net/danielinbiti/article/details/44963423