用java写一个有四个过滤器的并发式管道过滤器实例
时间: 2023-12-24 18:44:11 浏览: 119
用Java多线程写管道过滤器
您好,感谢您使用ChitGPT进行问答。关于您提出的问题,我可以给您一些指导和建议以帮助您完成实例的编写。
一个并发式管道过滤器实例通常是由多个过滤器组成,并且这些过滤器可以并行执行以提高效率。在Java中,您可以使用Java并发包中的Executor框架来实现并发执行。以下是一个简单的代码示例,给出一个具有四个过滤器的并发式管道过滤器实例:
```
import java.util.concurrent.*;
import java.util.concurrent.locks.*;
class FilterA implements Runnable {
private BlockingQueue<String> inQueue;
private BlockingQueue<String> outQueue;
public FilterA(BlockingQueue<String> in, BlockingQueue<String> out) {
inQueue = in;
outQueue = out;
}
@Override
public void run() {
try {
String data = inQueue.take();
// 简单地将数据转换为大写形式
String newData = data.toUpperCase();
outQueue.put(newData);
} catch (InterruptedException ie) {
Thread.currentThread().interrupt();
}
}
}
class FilterB implements Runnable {
private BlockingQueue<String> inQueue;
private BlockingQueue<String> outQueue;
public FilterB(BlockingQueue<String> in, BlockingQueue<String> out) {
inQueue = in;
outQueue = out;
}
@Override
public void run() {
try {
String data = inQueue.take();
// 简单地将数据转换为小写形式
String newData = data.toLowerCase();
outQueue.put(newData);
} catch (InterruptedException ie) {
Thread.currentThread().interrupt();
}
}
}
class FilterC implements Runnable {
private BlockingQueue<String> inQueue;
private BlockingQueue<String> outQueue;
public FilterC(BlockingQueue<String> in, BlockingQueue<String> out) {
inQueue = in;
outQueue = out;
}
@Override
public void run() {
try {
String data = inQueue.take();
// 简单地将数据反转
String newData = new StringBuilder(data).reverse().toString();
outQueue.put(newData);
} catch (InterruptedException ie) {
Thread.currentThread().interrupt();
}
}
}
class FilterD implements Runnable {
private BlockingQueue<String> inQueue;
private BlockingQueue<String> outQueue;
public FilterD(BlockingQueue<String> in, BlockingQueue<String> out) {
inQueue = in;
outQueue = out;
}
@Override
public void run() {
try {
String data = inQueue.take();
// 将数据加上时间戳
String newData = data + " " + System.currentTimeMillis();
outQueue.put(newData);
} catch (InterruptedException ie) {
Thread.currentThread().interrupt();
}
}
}
public class PipelineExample {
public static void main(String[] args) {
// 创建管道中的阻塞队列
BlockingQueue<String> queue1 = new LinkedBlockingQueue<>();
BlockingQueue<String> queue2 = new LinkedBlockingQueue<>();
BlockingQueue<String> queue3 = new LinkedBlockingQueue<>();
BlockingQueue<String> queue4 = new LinkedBlockingQueue<>();
// 创建线程池和过滤器
ExecutorService executor = Executors.newFixedThreadPool(4);
executor.execute(new FilterA(queue1, queue2));
executor.execute(new FilterB(queue2, queue3));
executor.execute(new FilterC(queue3, queue4));
executor.execute(new FilterD(queue4, queue1));
// 将数据加入到第一个阻塞队列
try {
queue1.put("Hello, world!");
} catch (InterruptedException ie) {
Thread.currentThread().interrupt();
}
// 等待一定的时间,以便过滤器有足够的时间运行
try {
TimeUnit.SECONDS.sleep(1);
} catch (InterruptedException ie) {
Thread.currentThread().interrupt();
}
// 从最后的阻塞队列中获取数据并进行输出
try {
String finalData = queue1.take();
System.out.println("Final data: " + finalData);
} catch (InterruptedException ie) {
Thread.currentThread().interrupt();
}
// 关闭线程池
executor.shutdown();
}
}
```
在上述示例中,我们定义了四个过滤器(FilterA、FilterB、FilterC、FilterD)。每个过滤器都实现了Runnable接口,并且在run方法中通过阻塞队列进行通信。执行器使用Java并发包中的Executor框架创建,并将过滤器对象添加到执行器中以进行并发执行。最终的结果存储在最后一个阻塞队列(queue1)中,并由主线程从中获取并进行输出。
希望这个例子可以帮助您实现您的并发式管道过滤器实例。如果您还有其他问题或需要更多帮助,请随时问我,谢谢!
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