org.apache.catalina.tribes.transport.nio

Class NioReplicationTask

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.

Version: $Revision: 546955 $, $Date: 2007-06-13 19:00:21 +0200 (Wed, 13 Jun 2007) $

Author: Filip Hanik

Constructor Summary
NioReplicationTask(ListenCallback callback, NioReceiver receiver)
Method Summary
protected voiddrainChannel(SelectionKey key, ObjectReader reader)
The actual code which drains the channel associated with the given key.
intgetRxBufSize()
protected voidregisterForRead(SelectionKey key, ObjectReader reader)
voidrun()
protected voidsendAck(SelectionKey key, SocketChannel channel, byte[] command)
send a reply-acknowledgement (6,2,3)
voidserviceChannel(SelectionKey key)
Called to initiate a unit of work by this worker thread on the provided SelectionKey object.
voidsetRxBufSize(int rxBufSize)

Constructor Detail

NioReplicationTask

public NioReplicationTask(ListenCallback callback, NioReceiver receiver)

Method Detail

drainChannel

protected void drainChannel(SelectionKey key, ObjectReader reader)
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.

getRxBufSize

public int getRxBufSize()

registerForRead

protected void registerForRead(SelectionKey key, ObjectReader reader)

run

public void run()

sendAck

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

Parameters: key channel

serviceChannel

public void serviceChannel(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.

setRxBufSize

public void setRxBufSize(int rxBufSize)
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