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  /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You under the Apache License, Version 2.0
   * (the "License"); you may not use this file except in compliance with
   * the License.  You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
 
 package org.apache.catalina.tribes.transport.bio;
 
 
A worker thread class which can drain channels and echo-back the input. Each instance is constructed with a reference to the owning thread pool object. When started, the thread loops forever waiting to be awakened to service the channel associated with a SelectionKey object. The worker is tasked by calling its serviceChannel() method with a SelectionKey object. The serviceChannel() method stores the key reference in the thread object then calls notify() to wake it up. When the channel has been drained, the worker thread returns itself to its parent pool.
 
 public class BioReplicationTask extends AbstractRxTask {
 
 
     private static final Log log = LogFactory.getLogBioReplicationTask.class );
 
     protected Socket socket;
     protected ObjectReader reader;
 
     public BioReplicationTask (ListenCallback callback) {
         super(callback);
     }
 
     // loop forever waiting for work to do
     @Override
     public synchronized void run()
     {
         if (  == null ) return;
         try {
             drainSocket();
         } catch ( Exception x ) {
             .error("Unable to service bio socket"x);
         }finally {
             try {
                 .close();
             }catch (Exception e) {
                 if (.isDebugEnabled()) {
                     .debug("Failed to close socket"e);
                 }
             }
             try {
                 .close();
             }catch (Exception e) {
                 if (.isDebugEnabled()) {
                     .debug("Failed to close reader"e);
                 }
             }
              = null;
              = null;
         }
         // done, ready for more, return to pool
         if ( getTaskPool() != null ) getTaskPool().returnWorker (this);
     }
 
 
     public synchronized void serviceSocket(Socket socketObjectReader reader) {
         this. = socket;
         this. = reader;
     }
 
     protected void execute(ObjectReader readerthrows Exception{
         int pkgcnt = reader.count();
 
         if ( pkgcnt > 0 ) {
             ChannelMessage[] msgs = reader.execute();
             for ( int i=0; i<msgs.lengthi++ ) {
                
Use send ack here if you want to ack the request to the remote server before completing the request This is considered an asynchronized request
                if (ChannelData.sendAckAsync(msgs[i].getOptions())) sendAck(.);
                try {
                    //process the message
                    getCallback().messageDataReceived(msgs[i]);
                    
Use send ack here if you want the request to complete on this server before sending the ack to the remote server This is considered a synchronized request
                    if (ChannelData.sendAckSync(msgs[i].getOptions())) sendAck(.);
                }catch  ( Exception x ) {
                    if (ChannelData.sendAckSync(msgs[i].getOptions())) sendAck(.);
                    .error("Error thrown from messageDataReceived.",x);
                }
                if ( getUseBufferPool() ) {
                    BufferPool.getBufferPool().returnBuffer(msgs[i].getMessage());
                    msgs[i].setMessage(null);
                }
            }
        }
    }

    
The actual code which drains the channel associated with the given key. This method assumes the key has been modified prior to invocation to turn off selection interest in OP_READ. When this method completes it re-enables OP_READ and calls wakeup() on the selector so the selector will resume watching this channel.
    protected void drainSocket () throws Exception {
        InputStream in = .getInputStream();
        // loop while data available, channel is non-blocking
        byte[] buf = new byte[1024];
        int length = in.read(buf);
        while ( length >= 0 ) {
            int count = .append(buf,0,length,true);
            if ( count > 0 ) execute();
            length = in.read(buf);
        }
    }


    
send a reply-acknowledgment (6,2,3)

Parameters:
command
    protected void sendAck(byte[] command) {
        try {
            OutputStream out = .getOutputStream();
            out.write(command);
            out.flush();
            if (.isTraceEnabled()) {
                .trace("ACK sent to " + .getPort());
            }
        } catch ( java.io.IOException x ) {
            .warn("Unable to send ACK back through channel, channel disconnected?: "+x.getMessage());
        }
    }
    @Override
    public void close() {
        setDoRun(false);
        try {
            .close();
        }catch (Exception e) {
            if (.isDebugEnabled()) {
                .debug("Failed to close socket"e);
            }
        }
        try {
            .close();
        }catch (Exception e) {
            if (.isDebugEnabled()) {
                .debug("Failed to close reader"e);
            }
        }
         = null;
         = null;
        super.close();
    }
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