org.apache.avalon.excalibur.monitor.impl
Class ActiveMonitor

java.lang.Object
  org.apache.avalon.excalibur.monitor.impl.AbstractMonitor
      org.apache.avalon.excalibur.monitor.impl.ActiveMonitor

All Implemented Interfaces:

java.lang.Runnable, Monitor, org.apache.avalon.framework.component.Component

Direct Known Subclasses:

ActiveMonitor

public class ActiveMonitor
extends AbstractMonitor
implements java.lang.Runnable

The ActiveMonitor is used to actively check a set of resources to see if they have changed. It will poll the resources with a frequency as specified or if unspecified with the default (60 seconds).

Version:

$Id: ActiveMonitor.java,v 1.5 2004/02/28 11:47:35 cziegeler Exp $

Author:

Avalon Development Team

Field Summary

private static long	DEFAULT_FREQUENCY
private long	m_frequency The frequency to scan resources for changes measured in milliseconds.
private boolean	m_keepRunning Set to false to shutdown the thread.
private java.lang.Thread	m_monitorThread The thread that does the monitoring.
private int	m_priority The priority of the thread that monitors resources.

Fields inherited from interface org.apache.avalon.excalibur.monitor.Monitor

ROLE

Constructor Summary

ActiveMonitor()

Method Summary

void	run()
void	setFrequency(long frequency) Set the frequency with which the monitor checks the resources.
void	setPriority(int priority) Set the priority of the active monitors thread.
void	start()
void	stop()

Methods inherited from class org.apache.avalon.excalibur.monitor.impl.AbstractMonitor

addResource, addResources, getResource, getResources, removeResource, removeResource, scanAllResources

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_FREQUENCY

private static final long DEFAULT_FREQUENCY

See Also:

Constant Field Values

m_frequency

private long m_frequency

The frequency to scan resources for changes measured in milliseconds.

m_priority

private int m_priority

The priority of the thread that monitors resources. Defaults to System specific Thread.MIN_PRIORITY.

m_monitorThread

private final java.lang.Thread m_monitorThread

The thread that does the monitoring.

m_keepRunning

private volatile boolean m_keepRunning

Set to false to shutdown the thread.

Constructor Detail

ActiveMonitor

public ActiveMonitor()

Method Detail

setFrequency

public void setFrequency(long frequency)

Set the frequency with which the monitor checks the resources. This can be changed anytime and will be enabled the next time through the check.

Parameters:

frequency - the frequency to scan resources for changes

setPriority

public void setPriority(int priority)

Set the priority of the active monitors thread.

Parameters:

priority - the priority of the active monitors thread.

start

public void start()
           throws java.lang.Exception

Throws:

java.lang.Exception

stop

public void stop()
          throws java.lang.Exception

Throws:

java.lang.Exception

run

public final void run()

Specified by:

run in interface java.lang.Runnable