Package hudson.slaves

Class ConnectionActivityMonitor

java.lang.Object

java.util.TimerTask

hudson.triggers.SafeTimerTask

hudson.model.PeriodicWork

hudson.model.AsyncPeriodicWork

hudson.slaves.ConnectionActivityMonitor

All Implemented Interfaces:

ExtensionPoint, Runnable

@Extension
@Symbol("connectionActivityMonitor")
public class ConnectionActivityMonitor
extends AsyncPeriodicWork

Makes sure that connections to agents are alive, and if they are not, cut them off.

If we only rely on TCP retransmission time out for this, the time it takes to detect a bad connection is in the order of 10s of minutes, so we take the matters to our own hands.

Since:

1.325

Author:

Kohsuke Kawaguchi

Nested Class Summary

Nested classes/interfaces inherited from class hudson.triggers.SafeTimerTask

SafeTimerTask.ExceptionRunnable

Nested classes/interfaces inherited from interface hudson.ExtensionPoint

ExtensionPoint.LegacyInstancesAreScopedToHudson

Field Summary

Fields

Modifier and Type	Field	Description
boolean	enabled

Fields inherited from class hudson.model.AsyncPeriodicWork

name

Fields inherited from class hudson.model.PeriodicWork

DAY, HOUR, logger, MIN

Constructor Summary

Constructors

Constructor	Description
ConnectionActivityMonitor()

Method Summary

Modifier and Type	Method	Description
protected void	execute(TaskListener listener)	Executes the task.
long	getRecurrencePeriod()	Gets the number of milliseconds between successive executions.

Methods inherited from class hudson.model.AsyncPeriodicWork

createListener, doRun, getErrorLoggingLevel, getLogFile, getNormalLoggingLevel, getSlowLoggingLevel

Methods inherited from class hudson.model.PeriodicWork

all, getInitialDelay, init

Methods inherited from class hudson.triggers.SafeTimerTask

getLogsRoot, of, run

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

Field Detail

enabled

public boolean enabled

Constructor Detail

ConnectionActivityMonitor

public ConnectionActivityMonitor()

Method Detail

execute

protected void execute(TaskListener listener)
                throws IOException,
                       InterruptedException

Description copied from class: AsyncPeriodicWork

Executes the task.

Specified by:

execute in class AsyncPeriodicWork

Parameters:

listener - Output sent will be reported to the users. (this work is TBD.)

Throws:

IOException - The caller will record the exception and moves on.

InterruptedException - The caller will record the exception and moves on.

getRecurrencePeriod

public long getRecurrencePeriod()

Description copied from class: PeriodicWork

Gets the number of milliseconds between successive executions.

Hudson calls this method once to set up a recurring timer, instead of calling this each time after the previous execution completed. So this class cannot be used to implement a non-regular recurring timer.

IOW, the method should always return the same value.

Specified by:

getRecurrencePeriod in class PeriodicWork