java编写的一个缓存类cache类实例

来源：互联网发布：js 实现map 编辑：程序博客网时间：2024/04/29 22:43

/*
/-----------------------------------------------
/ This class is a queue cache in multithreading,
/ it store object at tail,and remove object at
/ head,and it is thread-safe.
/-------------------------------------
*/

import java.util.LinkedList;
import java.lang.InterruptedException;

public class Cache
{
private LinkedList cache = new LinkedList();
private int cacheSize = 10;

    public Cache()
    {

    }

    public Cache(int cacheSize)
    {
      this.cacheSize = cacheSize;
    }

    public synchronized Object getCache() throws InterruptedException
    {
      System.out.println("Cache.getCache() method start!");
      Object object = null;
      while(true)
      {
        if(!cache.isEmpty())
        {
          object = cache.removeLast();
          notifyAll();
          break;
        }
        else
        {
          try
          {
            wait();
          }
          catch(InterruptedException e)
          {
            System.out.println("Cache.getCache() method is interrupted and end!");
            throw e;
          }
        }
      }
      System.out.println("Cache.getCache() method end!");
      return object;
    }

    public synchronized void setCache(Object object) throws InterruptedException
    {
      System.out.println("Cache.setCache() method start!");
      while(true)
      {
        if(cache.size() >= cacheSize)
        {
          try
          {
            wait();
          }
          catch(InterruptedException e)
          {
            System.out.println("Cache.setCache() method is interrupted and end!");
            throw e;
          }
        }
        else
        {
          cache.addFirst(object);
          notifyAll();
          break;
        }
      }
      System.out.println("Cache.setCache() method end!");
    }

    public String toString()
    {
      return cache.toString();
    }

public static void main(String arg[]){
    SingletonObj so = SingletonObj.getInstance(); //其中SingletonObj是一个单态类
     ArrayList al = so.getArrayListValue();
    Hua c = new Hua();
    try{
      c.setCache(al);
    }catch(Exception ex){

    }
    ArrayList al1 = new ArrayList();
    try{
      al1 = (ArrayList)c.getCache();
      for(int i = 0;i<al1.size();i++)
       System.out.println(al1.get(i));
    }catch(Exception ex){

    }

}

SingletonObj.java 程序
public class SingletonObj {

ArrayList al = new ArrayList();

    private SingletonObj(){
      //数据
      for(int i = 0; i < 100; i ++){
       al.add("wl"+i);
      }

    }
    private static SingletonObj so = new SingletonObj();
    public static SingletonObj getInstance(){
      return so;
    }
    public ArrayList getArrayListValue(){

      return al;
    }

}