com.sleepycat.je.rep.impl.node

Class ChannelTimeoutTask

java.lang.Object

java.util.TimerTask

com.sleepycat.je.rep.impl.node.ChannelTimeoutTask

All Implemented Interfaces:

java.lang.Runnable

public class ChannelTimeoutTask
extends java.util.TimerTask

The ChannelTimeoutTask ensures that all channels registered with it are periodically checked to ensure that they are active. The period roughly corresponds to a second, although intervening GC activity may expand this period considerably. Note that elapsedMs used for timeouts is always ticked up in 1 second increments. Thus multiple seconds of real time may correspond to a single second of "timer time" if the system is paricularly busy, or the gc has been particularly active. This property allows the underlying timeout implementation to compensate for GC pauses in which activity on the channel at the java level would have been suspended and thus reduces the number of false timeouts.

Constructor Summary

Constructors

Constructor and Description
ChannelTimeoutTask(java.util.Timer timer) Creates and schedules the timer task.

Method Summary

Methods

Modifier and Type	Method and Description
void	register(NamedChannelWithTimeout channel) Registers a channel so that the timer can make periodic calls to isActive().
void	run() Runs once a second checking to see if a channel is still active.

Methods inherited from class java.util.TimerTask

cancel, scheduledExecutionTime

Methods inherited from class java.lang.Object

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

Constructor Detail

ChannelTimeoutTask

ChannelTimeoutTask(java.util.Timer timer)

Creates and schedules the timer task.

Parameters:

timer - the timer associated with this task

Method Detail

run

public void run()

Runs once a second checking to see if a channel is still active. Each channel establishes its own timeout period using elapsedMs to check for timeouts. Inactive channels are removed from the list of registered channels.

Specified by:

run in interface java.lang.Runnable

Specified by:

run in class java.util.TimerTask

register

public void register(NamedChannelWithTimeout channel)

Registers a channel so that the timer can make periodic calls to isActive(). Note that closing a channel renders it inactive and causes it to be removed from the list by the run() method. Consequently, there is no corresponding unregister operation.

Parameters:

channel - the channel being registered.