DownloadThread.java

package com.coderising.week03.download;

import java.io.RandomAccessFile;
import java.util.concurrent.CyclicBarrier;

import com.coderising.week03.download.api.Connection;

public class DownloadThread extends Thread{

	Connection conn;
	int startPos;
	int endPos;
	CyclicBarrier barrier;
	String localFile;

	public DownloadThread( Connection conn, int startPos, int endPos, String localFile, CyclicBarrier barrier){
		
		this.conn = conn;		
		this.startPos = startPos;
		this.endPos = endPos;
		this.localFile = localFile;
		this.barrier = barrier;
	}
	public void run(){	
		
		try {
			System.out.println("Begin to read [" + startPos + "-" + endPos + "]");
			
			byte[] data = conn.read(startPos, endPos);
			
			RandomAccessFile file = new RandomAccessFile(localFile,"rw");
			
			file.seek(startPos);
			
			file.write(data);
			
			file.close();
			
			conn.close();
			
			barrier.await(); //等待别的线程完成
			
		} catch (Exception e) {
			e.printStackTrace();
		}
		
	}
}