Use Selector to multiplex Pipe.SourceChannels?

Question

Hi,
i am a little confused. I 'd like an object to have some references to multiple Pipe.SourceChannels and periodically check for incomig data. MultiPortEcho.java seems to do what i want, but by using SocketChannels.
Do i have to do something similar? Create a Selector, get the keys and check for OP_ACCEPT and OP_READ?
MultiPortEcho.java
ibm.com/developerWorks
import java.io.*;
import java.net.*;
import java.nio.*;
import java.nio.channels.*;
import java.util.*;
public class MultiPortEcho
  private int ports[];
  private ByteBuffer echoBuffer = ByteBuffer.allocate( 1024 );
  public MultiPortEcho( int ports[] ) throws IOException {
    this.ports = ports;
    go();
  private void go() throws IOException {
    // Create a new selector
    Selector selector = Selector.open();
    // Open a listener on each port, and register each one
    // with the selector
    for (int i=0; i<ports.length; ++i) {
      ServerSocketChannel ssc = ServerSocketChannel.open();
      ssc.configureBlocking( false );
      ServerSocket ss = ssc.socket();
      InetSocketAddress address = new InetSocketAddress( ports[i] );
      ss.bind( address );
      SelectionKey key = ssc.register( selector, SelectionKey.OP_ACCEPT );
      System.out.println( "Going to listen on "+ports[i] );
    while (true) {
      int num = selector.select();
      Set selectedKeys = selector.selectedKeys();
      Iterator it = selectedKeys.iterator();
      while (it.hasNext()) {
        SelectionKey key = (SelectionKey)it.next();
        if ((key.readyOps() & SelectionKey.OP_ACCEPT)
          == SelectionKey.OP_ACCEPT) {
          // Accept the new connection
          ServerSocketChannel ssc = (ServerSocketChannel)key.channel();
          SocketChannel sc = ssc.accept();
          sc.configureBlocking( false );
          // Add the new connection to the selector
          SelectionKey newKey = sc.register( selector, SelectionKey.OP_READ );
          it.remove();
          System.out.println( "Got connection from "+sc );
        } else if ((key.readyOps() & SelectionKey.OP_READ)
          == SelectionKey.OP_READ) {
          // Read the data
          SocketChannel sc = (SocketChannel)key.channel();
          // Echo data
          int bytesEchoed = 0;
          while (true) {
            echoBuffer.clear();
            int r = sc.read( echoBuffer );
            if (r<=0) {
              break;
            echoBuffer.flip();
            sc.write( echoBuffer );
            bytesEchoed += r;
          System.out.println( "Echoed "+bytesEchoed+" from "+sc );
          it.remove();
//System.out.println( "going to clear" );
//      selectedKeys.clear();
//System.out.println( "cleared" );
  static public void main( String args[] ) throws Exception {
    if (args.length<=0) {
      System.err.println( "Usage: java MultiPortEcho port [port port ...]" );
      System.exit( 1 );
    int ports[] = new int[args.length];
    for (int i=0; i<args.length; ++i) {
      ports[i] = Integer.parseInt( args[i] );
    new MultiPortEcho( ports );
}Message was edited by:
uig

Answer 1

You don't have to worry about OP_ACCEPT with Pipe because there are no server pipes. You already have both sides of the Pipe by construction, so just implement the OP_READ part.