filelist.java

JAVA实现的网络服务器文件同步

package com.msd;

import java.util.List;
import java.util.LinkedList;

public class FileList {

   private List filePool = null;
   private static FileList instance = null;

   private FileList() {
      filePool = new LinkedList();
   }

   public synchronized static void create() {
      if(instance == null) 
		 instance = new FileList();
   }

   public static FileList getInstance() {
      if(instance == null)
		 throw new NullPointerException("FileList is null");
	  return instance;
   }

   public void addFile(byte f,String n,byte[] a) {
      synchronized(filePool) {
         filePool.add(filePool.size(),new UpFile(f,n,a));
         filePool.notifyAll();
      }
   }

   public UpFile getFile() {
	  UpFile uf = null;
      synchronized(filePool) {
         while(filePool.isEmpty()) {
            try{
               filePool.wait();
            } catch(InterruptedException e) {   }
         }
         uf = (UpFile)filePool.remove(0);
      }
	  return uf;
   }

}

class UpFile {
	
	byte flag;
	String fileName;
	byte[] arr;
	
	UpFile(byte f,String n,byte[] a) {
		flag = f;
		fileName = n;
		arr = a;	
	}
		
}