Java生產者消費者問題 .

最後更新：2018-12-04 來源：互聯網

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生產者,消費者,固定長度緩衝區,此外外部可以中斷線程

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();
}

}

// 這個class就是倉庫，是生產者跟消費者共同爭奪控制權的同步資源
class BufferLock {
public boolean IsProduceEnd;

public int BufferLength;

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

BufferLock() {
BufferLength = 10;
}

//生產產品,放到緩衝區列表裡
public synchronized void push(String product) {
  while (list.size() == BufferLength) {//倉庫滿
   try {
    wait();// 等待
   } catch (InterruptedException e) {
    e.printStackTrace();
   }
  }
  // 倉庫不滿
  notifyAll();
  list.add(product);
  System.out.println(" 抽取了: " + product);
  System.out.println(Arrays.toString(list.toArray()));
}

//消費產品,從緩衝區列表取走
public synchronized void pop() {
  while (list.size() == 0) {//倉庫空
   try {
    System.out.println("沒有索引資源,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) { // 沒有被外部中斷
 buffer.push("檔案" + i);
 if (i == 199) {//抽取結束
 System.out.println("抽取結束");
 indexControl.IsExtractEnd = true;
 }
 } else {
 System.out.println("抽取中斷");
 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) {// 沒有被外部中斷
    if (indexControl.IsExtractEnd == true && buffer.list.size() == 0)
    {// 掃描完畢而且緩衝區為空白是索引結束條件
     System.out.println("索引結束");
     indexControl.IsIndexEnd = true;
     break;
    } else
     buffer.pop();
   } else {
    System.out.println("索引中斷");
    break;
   }
  }
}
}

class ControlCondition {
boolean IsExtractEnd=false;

boolean IsIndexEnd=false;

boolean IsInterrupt=false;
}

/*
* 顯示索引消耗時間對話方塊線程
*/
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...計時: "
 + (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！共耗時 "
 + (endTime.getTime() - startTime.getTime())
 + " 毫秒." + " 請在索引菜單下查看索引日誌"
 + "</body></html>");
 dlg.jButOK.setEnabled(true);
 dlg.jButStopIndexThread.setEnabled(false);
 break;
 }

if (indexControl.IsInterrupt == true) {// indexThread中斷
 Date endTime = new Date();
 dlg.jLabelShow.setText("<html><body>索引被中斷！共耗時 "
 + (endTime.getTime() - startTime.getTime())
 + " 毫秒." + " 請在索引菜單下查看索引日誌"
 + "</body></html>");
 dlg.jButOK.setEnabled(true);
 dlg.jButStopIndexThread.setEnabled(false);
 break;
 }
 }
}
}

本文章原先以中文撰寫並發佈於 aliyun.com，亦設英文版本，僅作資訊用途。本網站不對文章的準確性，完整性或可靠性或其任何翻譯作出任何明示或暗示的陳述或保證。如對該文章有任何疑慮或投訴，請傳送電郵至 info-contact@alibabacloud.com 並提供相關疑慮或投訴的詳細說明。職員會於 5 個工作天內與您聯絡，一經驗證之後，即會刪除該侵權內容。

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