当我无故向水槽写信时，NIO Pipe会抛出“ Broken Pipe”！如何调试？

Question

我相信我做的一切正确。我创建一个管道，将接收器传递到编写器线程，使用OP_READ在选择器上注册源，启动选择器。一切正常，但是一旦我向接收器写入内容，就会出现管道异常的情况。为什么!!!
???
这里没有破损的管道。我烦了。我如何调试/了解这里发生了什么？有没有人有一个简单的管道示例，我可以运行它来测试是否正常。写在接收器上的线程，选择器读取它。

编辑：
我几乎遵循了这里的建议。很难在Internet上找到NIO管道的具体示例。

import java.io.*;
import java.nio.ByteBuffer;
import java.nio.channels.*;
import java.util.Iterator;

public class SystemOutPipe extends Thread {

  public static void main(String[] args)
  {
    try {
      SystemOutPipe sop = new SystemOutPipe();
      sop.start();
      System.out.println("This message should be redirected to System.err\nNow waiting 5 seconds ...");
      Thread.sleep(5000L);
      sop.setStopped(true);
      sop.join();
    } catch (Exception e) {
      e.printStackTrace();
    }
  }

  private Selector selector;
  private Pipe pipe;
  private boolean stopped = false;

  public SystemOutPipe() throws IOException {
    super("SystemOutPipe");
    pipe = Pipe.open();
    System.setOut(new PrintStream(new PipeOutputStream(pipe)));
    selector = Selector.open();
    pipe.source().configureBlocking(false);
    pipe.source().register(selector, SelectionKey.OP_READ, ByteBuffer.allocate(1024));
  }

  @Override
  public void run() {
    try {
      while (!isStopped()) {
        int n = selector.select(1L);
        if (n > 0) {
          Iterator<SelectionKey> it = selector.selectedKeys().iterator();
          while (it.hasNext()) {
            SelectionKey key = it.next();
            it.remove();
            if (key.isReadable()) {
              new ReadHandler(key).run();
            }
          }
        }
      }
    } catch (Exception e) {
      e.printStackTrace(); // writes to System.err !
    }
  }

  public synchronized boolean isStopped() {
    return stopped;
  }

  public synchronized void setStopped(final boolean stopped) {
    this.stopped = stopped;
  }

  public class ReadHandler implements Runnable {
    private final SelectionKey key;

    public ReadHandler(final SelectionKey key) {
      this.key = key;
    }

    @Override
    public void run() {
      ByteBuffer bbuf = (ByteBuffer) key.attachment();
      ReadableByteChannel channel = (ReadableByteChannel) key.channel();
      try
      {
        int count = 0;
        do {
          bbuf.clear();
          count = channel.read(bbuf);
          if (count > 0) System.err.write(bbuf.array(), 0, count);
        } while(count > 0);
      } catch (IOException e) {
        e.printStackTrace();
        key.cancel();
      }
    }
  }

  public class PipeOutputStream extends OutputStream {
    private final Pipe pipe;

    public PipeOutputStream(final Pipe pipe) {
      this.pipe = pipe;
    }

    @Override
    public void write(final int b) throws IOException {
      write(new byte[] { (byte) b });
    }

    @Override
    public void write(final byte[] b) throws IOException {
      write(b, 0, b.length);
    }

    @Override
    public void write(final byte[] b, final int off, final int len) throws IOException {
      ByteBuffer bbuf = ByteBuffer.wrap(b, off, len);
      bbuf.position(len);
      bbuf.flip();
      int count = 0;
      while (count < len) {
        int n = pipe.sink().write(bbuf);
        if (n == 0) {
          // let's wait a bit and not consume cpu
          try {
            Thread.sleep(1L);
          } catch (InterruptedException e) {
            throw new IOException(e);
          }
        }
        else count += n;
      }
    }
  }
}

例外：

java.io.IOException: Broken pipe
    at sun.nio.ch.FileDispatcher.write0(Native Method)
    at sun.nio.ch.FileDispatcher.write(FileDispatcher.java:39)
    at sun.nio.ch.IOUtil.writeFromNativeBuffer(IOUtil.java:72)
    at sun.nio.ch.IOUtil.write(IOUtil.java:43)
    at sun.nio.ch.SinkChannelImpl.write(SinkChannelImpl.java:149)
    at com.niostuff.util.GCLogInterceptor.fileModified(GCLogInterceptor.java:180)
    at net.contentobjects.jnotify.linux.JNotifyAdapterLinux$WatchData.notifyFileModified(Unknown Source)
    at net.contentobjects.jnotify.linux.JNotifyAdapterLinux.notifyChangeEvent(Unknown Source)
    at net.contentobjects.jnotify.linux.JNotifyAdapterLinux$1.notify(Unknown Source)
    at net.contentobjects.jnotify.linux.JNotify_linux.callbackProcessEvent(Unknown Source)
    at net.contentobjects.jnotify.linux.JNotify_linux.nativeNotifyLoop(Native Method)
    at net.contentobjects.jnotify.linux.JNotify_linux.access$000(Unknown Source)
    at net.contentobjects.jnotify.linux.JNotify_linux$1.run(Unknown Source)

Answer 1

好的，所以我发现了问题。首先，感谢所有尝试提供帮助的人。希望你能从我的错误中学到东西。事件链是：

1-我没有耗尽接收缓冲区（源通道读入的缓冲区），最终缓冲区已满。

2-现在已满，pipeSourceChannel.read（readBuffer）返回0字节。有要读取的数据，但无法在完整的缓冲区上读取。

3-这导致通道被关闭（我自己在bytesRead == 0上这样做）和BrokenPipe。