keepalive.keepalive
Class PassiveKeepAliveWithIHY

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

All Implemented Interfaces:

MessageListener, java.lang.Runnable

public class PassiveKeepAliveWithIHY

extends KeepAlive

implements MessageListener

Combines PassiveKeepAlive with I-Hear-You responses to incoming Are-You-Theres. Used with ActiveKeepAliveWithAYT. Serves as an example of combining Keep-Alives in a single application, as will often happen in real programs.

See Also:

PassiveKeepAlive, IHearYou, ActiveKeepAliveWithAYT

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

PassiveKeepAliveWithIHY()

PassiveKeepAliveWithIHY(Receiver receiver, Sender sender)

Method Summary

boolean	messageReceived(java.lang.String s) This method examines all incoming messages, checking for Are-You-Theres.
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)

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

PassiveKeepAliveWithIHY

public PassiveKeepAliveWithIHY(Receiver receiver,
                               Sender sender)

PassiveKeepAliveWithIHY

public PassiveKeepAliveWithIHY()

Method Detail

setReceiver

public void setReceiver(Receiver receiver)

Overrides:

setReceiver in class KeepAlive

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 examines all incoming messages, checking for Are-You-Theres. This method is called 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" could have been expressed here by a dummy message, since its only purpose is to update the last-message-received timestamp for the Are-You-There side.

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.