Test Pipe objects using a worker thread. - Java File Path IO

Java examples for File Path IO:File Channel

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Description

Test Pipe objects using a worker thread.

Demo Code

import java.nio.ByteBuffer;
import java.nio.channels.Channels;
import java.nio.channels.Pipe;
import java.nio.channels.ReadableByteChannel;
import java.nio.channels.WritableByteChannel;
import java.util.Random;

public class Main {
  public static void main(String[] argv) throws Exception {
    WritableByteChannel out = Channels.newChannel(System.out);
    ReadableByteChannel workerChannel = startWorker(10);
    ByteBuffer buffer = ByteBuffer.allocate(100);

    while (workerChannel.read(buffer) >= 0) {
      buffer.flip();//from w ww.  j  av a 2  s . c  om
      out.write(buffer);
      buffer.clear();
    }
  }
  private static ReadableByteChannel startWorker(int reps) throws Exception {
    Pipe pipe = Pipe.open();
    Worker worker = new Worker(pipe.sink(), reps);
    worker.start();
    return (pipe.source());
  }
  private static class Worker extends Thread {
    WritableByteChannel channel;
    private int reps;

    Worker(WritableByteChannel channel, int reps) {
      this.channel = channel;
      this.reps = reps;
    }
    public void run() {
      ByteBuffer buffer = ByteBuffer.allocate(100);

      try {
        for (int i = 0; i < this.reps; i++) {
          doSomeWork(buffer);
          while (channel.write(buffer) > 0) {
          }
        }

        this.channel.close();
      } catch (Exception e) {
        e.printStackTrace();
      }
    }
    private void doSomeWork(ByteBuffer buffer) {
      buffer.clear();
      buffer.put("asdf".getBytes());
      buffer.put("\r\n".getBytes());
      buffer.flip();
    }
  }
}

Result


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