public class Request { private final String name; // 委托者 private final int number; // 请求编号 private static final Random random = new Random(); public Request(String name, int number) { this.name = name; this.number = number; } public void execute() { System.out.println(Thread.currentThread().getName() + " executes " + this); try { Thread.sleep(random.nextInt(1000)); } catch (InterruptedException e) { } } public String toString() { return "[ Request from " + name + " No." + number + " ]"; } }
public class ClientThread extends Thread { private final Channel channel; private static final Random random = new Random(); public ClientThread(String name, Channel channel) { super(name); this.channel = channel; } public void run() { try { for (int i = 0; true; i++) { Request request = new Request(getName(), i); channel.putRequest(request); Thread.sleep(random.nextInt(1000)); } } catch (InterruptedException e) { } } }
public class WorkerThread extends Thread { private final Channel channel; public WorkerThread(String name, Channel channel) { super(name); this.channel = channel; } public void run() { while (true) { Request request = channel.takeRequest(); request.execute(); } } }
public class Channel { private static final int MAX_REQUEST = 100; private final Request[] requestQueue; private int tail; // 下一个putRequest的地方 private int head; // 下一个takeRequest的地方 private int count; // Request的数量 private final WorkerThread[] threadPool; public Channel(int threads) { this.requestQueue = new Request[MAX_REQUEST]; this.head = 0; this.tail = 0; this.count = 0; threadPool = new WorkerThread[threads]; for (int i = 0; i < threadPool.length; i++) { threadPool[i] = new WorkerThread("Worker-" + i, this); } } public void startWorkers() { for (int i = 0; i < threadPool.length; i++) { threadPool[i].start(); } } public synchronized void putRequest(Request request) { while (count >= requestQueue.length) { try { wait(); } catch (InterruptedException e) { } } requestQueue[tail] = request; tail = (tail + 1) % requestQueue.length; count++; notifyAll(); } public synchronized Request takeRequest() { while (count <= 0) { try { wait(); } catch (InterruptedException e) { } } Request request = requestQueue[head]; head = (head + 1) % requestQueue.length; count--; notifyAll(); return request; } }
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public class Main { public static void main(String[] args) { Channel channel = new Channel(5); // 工人线程的數量 channel.startWorkers(); new ClientThread("Alice", channel).start(); new ClientThread("Bobby", channel).start(); new ClientThread("Chris", channel).start(); } }