Android Open Source - SimplePushDemoApp Socket Channel I O Helper

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License

The source code is released under:

GNU General Public License

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Java Source Code

package org.java_websocket;
//from  w  w  w  . jav  a  2 s.c  om
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.ByteChannel;
import java.nio.channels.spi.AbstractSelectableChannel;

import org.java_websocket.WebSocket.Role;

public class SocketChannelIOHelper {

  public static boolean read( final ByteBuffer buf, WebSocketImpl ws, ByteChannel channel ) throws IOException {
    buf.clear();
    int read = channel.read( buf );
    buf.flip();

    if( read == -1 ) {
      ws.eot();
      return false;
    }
    return read != 0;
  }

  /**
   * @see WrappedByteChannel#readMore(ByteBuffer)
   * @return returns whether there is more data left which can be obtained via {@link #readMore(ByteBuffer, WebSocketImpl, WrappedByteChannel)}
   **/
  public static boolean readMore( final ByteBuffer buf, WebSocketImpl ws, WrappedByteChannel channel ) throws IOException {
    buf.clear();
    int read = channel.readMore( buf );
    buf.flip();

    if( read == -1 ) {
      ws.eot();
      return false;
    }
    return channel.isNeedRead();
  }

  /** Returns whether the whole outQueue has been flushed */
  public static boolean batch( WebSocketImpl ws, ByteChannel sockchannel ) throws IOException {
    ByteBuffer buffer = ws.outQueue.peek();
    WrappedByteChannel c = null;

    if( buffer == null ) {
      if( sockchannel instanceof WrappedByteChannel ) {
        c = (WrappedByteChannel) sockchannel;
        if( c.isNeedWrite() ) {
          c.writeMore();
        }
      }
    } else {
      do {// FIXME writing as much as possible is unfair!!
        /*int written = */sockchannel.write( buffer );
        if( buffer.remaining() > 0 ) {
          return false;
        } else {
          ws.outQueue.poll(); // Buffer finished. Remove it.
          buffer = ws.outQueue.peek();
        }
      } while ( buffer != null );
    }

    if( ws.outQueue.isEmpty() && ws.isFlushAndClose() && ws.getDraft().getRole() == Role.SERVER ) {//
      synchronized ( ws ) {
        ws.closeConnection();
      }
    }
    return c != null ? !( (WrappedByteChannel) sockchannel ).isNeedWrite() : true;
  }
}

Java Source Code List