Java生产者消费者问题 .

来源：互联网发布：阿里云更换地域编辑：程序博客网时间：2024/05/16 04:41

生产者,消费者,固定长度缓冲区,此外外部可以中断线程

import java.util.Arrays;
import java.util.Date;
import java.util.LinkedList;
import javax.swing.*;

public class ProducerConsumer {

public static JFrame inst;

public static void main(String[] args) {

BufferLock buffer = new BufferLock();
ControlCondition indexControl = new ControlCondition();

  (new IndexTimeDialogThread(indexControl)).start();
  (new Producer(buffer, indexControl, "抽取")).start();
  (new Consumer(buffer, indexControl, "索引")).start();
}

}

// 这个class就是仓库，是生产者跟消费者共同争夺控制权的同步资源
class BufferLock {
public boolean IsProduceEnd;

public int BufferLength;

LinkedList<String> list = new LinkedList<String>();

BufferLock() {
BufferLength = 10;
}

//生产产品,放到缓冲区列表里
public synchronized void push(String product) {
  while (list.size() == BufferLength) {//仓库满
   try {
    wait();// 等待
   } catch (InterruptedException e) {
    e.printStackTrace();
   }
  }
  // 仓库不满
  notifyAll();
  list.add(product);
  System.out.println(" 抽取了: " + product);
  System.out.println(Arrays.toString(list.toArray()));
}

//消费产品,从缓冲区列表取走
public synchronized void pop() {
  while (list.size() == 0) {//仓库空
   try {
    System.out.println("没有索引资源,等待抽取");
    wait();
   } catch (InterruptedException e) {
    e.printStackTrace();
   }
  }
  notifyAll();
  String product = list.removeFirst();
  System.out.println(" 索引了: " + product);
  System.out.println(Arrays.toString(list.toArray()));
}
}

class Producer extends Thread {
BufferLock buffer = null;

String name;

ControlCondition indexControl;

Producer(BufferLock buffer, ControlCondition indexControl, String name) {
  this.buffer = buffer;
  this.indexControl = indexControl;
  this.name = name;
}

public void run() {

for (int i = 0; i < 200; i++) {
 if (indexControl.IsInterrupt == false) { // 没有被外部中断
 buffer.push("文件" + i);
 if (i == 199) {//抽取结束
 System.out.println("抽取结束");
 indexControl.IsExtractEnd = true;
 }
 } else {
 System.out.println("抽取中断");
 break;
 }
 }
}
}

class Consumer extends Thread {
BufferLock buffer = null;

ControlCondition indexControl;

String name;

Consumer(BufferLock buffer, ControlCondition indexControl, String name) {
  this.indexControl = indexControl;
  this.buffer = buffer;
  this.name = name;
}

public void run() {
  while (true) {
   if (indexControl.IsInterrupt == false) {// 没有被外部中断
    if (indexControl.IsExtractEnd == true && buffer.list.size() == 0)
    {// 扫描完毕而且缓冲区为空是索引结束条件
     System.out.println("索引结束");
     indexControl.IsIndexEnd = true;
     break;
    } else
     buffer.pop();
   } else {
    System.out.println("索引中断");
    break;
   }
  }
}
}

class ControlCondition {
boolean IsExtractEnd=false;

boolean IsIndexEnd=false;

boolean IsInterrupt=false;
}

/*
* 显示索引消耗时间对话框线程
*/
class IndexTimeDialogThread extends Thread {
ShowDialog dlg;

ControlCondition indexControl;

public IndexTimeDialogThread(ControlCondition indexControl) {
  this.indexControl = indexControl;
  dlg = new ShowDialog(null, indexControl, "建立索引", false, "");
  dlg.jButOK.setEnabled(false);
  dlg.setVisible(true);
}

public void run() {
 Date startTime = new Date();
 while (true) {
 Date now = new Date();
 dlg.jLabelShow.setText("<html><body>正在建立索引...计时: "
 + (now.getTime() - startTime.getTime())
 + " 毫秒</body></html>");
 if (indexControl.IsIndexEnd == true) {// indexThread完成
 Date endTime = new Date();
 dlg.jLabelShow.setText("<html><body>索引完成！共耗时 "
 + (endTime.getTime() - startTime.getTime())
 + " 毫秒." + " 请在索引菜单下查看索引日志"
 + "</body></html>");
 dlg.jButOK.setEnabled(true);
 dlg.jButStopIndexThread.setEnabled(false);
 break;
 }

if (indexControl.IsInterrupt == true) {// indexThread中断
 Date endTime = new Date();
 dlg.jLabelShow.setText("<html><body>索引被中断！共耗时 "
 + (endTime.getTime() - startTime.getTime())
 + " 毫秒." + " 请在索引菜单下查看索引日志"
 + "</body></html>");
 dlg.jButOK.setEnabled(true);
 dlg.jButStopIndexThread.setEnabled(false);
 break;
 }
 }
}
}