Apache Tomcat 6.0.53

Class NioReplicationTask

  extended by org.apache.catalina.tribes.transport.AbstractRxTask
      extended by org.apache.catalina.tribes.transport.nio.NioReplicationTask
All Implemented Interfaces:

public class NioReplicationTask
extends AbstractRxTask

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.

Filip Hanik

Field Summary
Fields inherited from class org.apache.catalina.tribes.transport.AbstractRxTask
Constructor Summary
NioReplicationTask(ListenCallback callback, NioReceiver receiver)
Method Summary
protected  void drainChannel(java.nio.channels.SelectionKey key, ObjectReader reader)
          The actual code which drains the channel associated with the given key.
 int getRxBufSize()
protected  void registerForRead(java.nio.channels.SelectionKey key, ObjectReader reader)
 void run()
protected  void sendAck(java.nio.channels.SelectionKey key, java.nio.channels.SocketChannel channel, byte[] command)
          send a reply-acknowledgement (6,2,3)
 void serviceChannel(java.nio.channels.SelectionKey key)
          Called to initiate a unit of work by this worker thread on the provided SelectionKey object.
 void setRxBufSize(int rxBufSize)
Methods inherited from class org.apache.catalina.tribes.transport.AbstractRxTask
close, getCallback, getOptions, getTaskPool, getUseBufferPool, isDoRun, setCallback, setDoRun, setOptions, setTaskPool, setUseBufferPool
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail


public NioReplicationTask(ListenCallback callback,
                          NioReceiver receiver)
Method Detail


public void run()


public void serviceChannel(java.nio.channels.SelectionKey key)
Called to initiate a unit of work by this worker thread on the provided SelectionKey object. This method is synchronized, as is the run() method, so only one key can be serviced at a given time. Before waking the worker thread, and before returning to the main selection loop, this key's interest set is updated to remove OP_READ. This will cause the selector to ignore read-readiness for this channel while the worker thread is servicing it.


protected void drainChannel(java.nio.channels.SelectionKey key,
                            ObjectReader reader)
                     throws java.lang.Exception
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 registerForRead(java.nio.channels.SelectionKey key,
                               ObjectReader reader)


protected void sendAck(java.nio.channels.SelectionKey key,
                       java.nio.channels.SocketChannel channel,
                       byte[] command)
send a reply-acknowledgement (6,2,3)

key -
channel -


public void setRxBufSize(int rxBufSize)


public int getRxBufSize()

Apache Tomcat 6.0.53

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