多线程设计模式 -- ProducerConsumer
2009-09-17 00:00:00 来源:WEB开发网放蛋糕的桌子
Java代码
public class Table {
private final String[] buffer;
private int tail; /下一个放put的地方
private int head; //下一个放的take地方
private int count; // buffer内的蛋糕数
public Table(int count) {
this.buffer = new String[count];
this.head = 0;
this.tail = 0;
this.count = 0;
}
// 放置蛋糕
public synchronized void put(String cake) throws InterruptedException {
System.out.println(Thread.currentThread().getName() + " puts " + cake);
while (count >= buffer.length) {
wait();//当蛋糕数大于容器大小是等待
}
buffer[tail] = cake;
tail = (tail + 1) % buffer.length;
count++;
notifyAll();//唤醒等待线程
}
// 取得蛋糕
public synchronized String take() throws InterruptedException {
while (count <= 0) {
wait();//当蛋糕数为0时,等待
}
String cake = buffer[head];
head = (head + 1) % buffer.length;
count--;
notifyAll();//唤醒等待线程
System.out.println(Thread.currentThread().getName() + " takes " + cake);
return cake;
}
}
吃线程
Java代码
public class EaterThread extends Thread {
private final Random random;
private final Table table;
public EaterThread(String name, Table table, long seed) {
super(name);
this.table = table;
this.random = new Random(seed);
}
public void run() {
try {
while (true) {
String cake = table.take();
Thread.sleep(random.nextInt(1000));
}
} catch (InterruptedException e) {
}
}
}
做线程
Java代码
public class MakerThread extends Thread {
private final Random random;
private final Table table;
private static int id = 0; // 蛋糕的流水号(所有厨师共通)
public MakerThread(String name, Table table, long seed) {
super(name);
this.table = table;
this.random = new Random(seed);
}
public void run() {
try {
while (true) {
Thread.sleep(random.nextInt(1000));
String cake = "[ Cake No." + nextId() + " by " + getName() + " ]";
table.put(cake);
}
} catch (InterruptedException e) {
}
}
private static synchronized int nextId() {
return id++;
}
}
测试线程
Java代码
public class Main {
public static void main(String[] args) {
Table table = new Table(3); // 建立可以放置3個蛋糕的桌子
new MakerThread("MakerThread-1", table, 31415).start();
new MakerThread("MakerThread-2", table, 92653).start();
new MakerThread("MakerThread-3", table, 58979).start();
new EaterThread("EaterThread-1", table, 32384).start();
new EaterThread("EaterThread-2", table, 62643).start();
new EaterThread("EaterThread-3", table, 38327).start();
}
Tags:线程 设计模式 ProducerConsumer
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