Package org.apache.avalon.excalibur.monitor

An extensible resource monitor framework and implementation.

See:
Description

Interface Summary

Modifiable	This interface is used by the Monitor section so that we can test if a resource is modified by an external source.
Monitor	The Monitor is used to actively check a set of resources to see if they have changed.
Monitorable	Describes an object which can be monitored.

Class Summary

ActiveMonitor	The ActiveMonitor is used to actively check a set of resources to see if they have changed.
DirectoryResource	This is a Resource that monitors a directory.
FileResource	Managed File based Resource.
MonitorableURLSource	This adds the Monitorable interface to the URLSource.
PassiveMonitor	The PassiveMonitor is used to passively check a set of resources to see if they have changed.
Resource	Managed Resource.
ResourceOutputStream	Managed Stream.
ResourceWriter	Managed Writer.
SourceResource
StreamResource	Managed Stream based Resource.

Package org.apache.avalon.excalibur.monitor Description

An extensible resource monitor framework and implementation.

[Introduction]

Introduction

The org.apache.avalon.excalibur.monitor package contains interfaces and classes for resource monitoring. The design is sufficiently modular to allow for different implementations of the monitoring strategies, and resource types. A FileResource is included for your convenience.

In order to receive notification that a resource has been modified, you must implement the java.beans.PropertyChangeListener interface. You will be notified with a java.beans.PropertyChangeEvent where the property name is "last-modified". Because the PropertyChangeEvent works with Objects, you must recast the Object returned into a java.lang.Long object. From there you can derive the previously modified time as well as the current modified time.