keepalive.keepalive
Class IHearYou

java.lang.Object
  |
  +--java.lang.Thread
        |
        +--keepalive.keepalive.KeepAlive
              |
              +--keepalive.keepalive.IHearYou

All Implemented Interfaces:

MessageListener, java.lang.Runnable

public class IHearYou

extends KeepAlive

implements MessageListener

This "Keep-Alive" does not actually do anything for cleaning up the local socket; rather, it helps the remote Are-You-There protocol by waiting for incoming Are-You-Theres and responding to them.

Fields inherited from class keepalive.keepalive.KeepAlive

ARE_YOU_THERE, endRequested, I_HEAR_YOU, TIME_BETWEEN_ACTIVE_PROBES

Fields inherited from class java.lang.Thread

MAX_PRIORITY, MIN_PRIORITY, NORM_PRIORITY

Constructor Summary

IHearYou()

IHearYou(Receiver receiver, Sender sender)

Method Summary

boolean	messageReceived(java.lang.String s) This method is called by Receiver as the call-back method from MessageListener Ignore all messages but "Are You There." Respond to Are-You-There with "I Hear You." "I Hear you" is expressed here by a dummy message, since its only purpose is to update the last-message-received timestamp for the other side.
void	run() Require the subclasses to implement run(), to prevent them from using the run() method in class Thread with a null body.
void	setReceiver(Receiver receiver) Set the receiver object which receives messages that arrive at the socket associated with this Keep-Alive.

Methods inherited from class keepalive.keepalive.KeepAlive

end, endRequested, getDummyString, getReceiver, getSender, getSilentTimeForIncoming, setSender

Methods inherited from class java.lang.Thread

activeCount, checkAccess, countStackFrames, currentThread, destroy, dumpStack, enumerate, getContextClassLoader, getName, getPriority, getThreadGroup, interrupt, interrupted, isAlive, isDaemon, isInterrupted, join, join, join, resume, setContextClassLoader, setDaemon, setName, setPriority, sleep, sleep, start, stop, stop, suspend, toString, yield

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

IHearYou

public IHearYou(Receiver receiver,
                Sender sender)

IHearYou

public IHearYou()

Method Detail

setReceiver

public void setReceiver(Receiver receiver)

Set the receiver object which receives messages that arrive at the socket associated with this Keep-Alive.

Overrides:

setReceiver in class KeepAlive

Parameters:

receiver -

run

public void run()

Description copied from class: KeepAlive

Require the subclasses to implement run(), to prevent them from using the run() method in class Thread with a null body.

Overrides:

run in class KeepAlive

messageReceived

public boolean messageReceived(java.lang.String s)

This method is called by Receiver as the call-back method from MessageListener Ignore all messages but "Are You There." Respond to Are-You-There with "I Hear You." "I Hear you" is expressed here by a dummy message, since its only purpose is to update the last-message-received timestamp for the other side. Our messages are sent as Strings. In real applications you will want a more sophisticated encapsulation of messages, perhaps as serialized objects.

Specified by:

messageReceived in interface MessageListener

Following copied from interface: keepalive.communication.MessageListener

Parameters:

s - the message that was received

Returns:

true if this MessageListener processed the incoming message, false if it ignored it.