org.rhq.plugins.database

Class DatabasePluginLifecycleListener

java.lang.Object

org.rhq.plugins.database.DatabasePluginLifecycleListener

All Implemented Interfaces:

PluginLifecycleListener

public class DatabasePluginLifecycleListener
extends Object
implements PluginLifecycleListener

This is a plugin lifecycle listener object for database plugins. It is used to deregister any JDBC drivers that happened to have been cached by the plugin. This is needed to avoid leaking perm gen memory when a plugin's classloader is destroyed because java.sql.DriverManager will maintain references that prevent the plugin's classloader and its resources from being garbaged collected. All database plugins should have their own class that does this but due to the odd way java.sql.DriverManager caches drivers, plugins that extend the database plugin cannot simply reuse or subclass this object.

Author:

John Mazzitelli

Constructor Summary

Constructors

Constructor and Description
DatabasePluginLifecycleListener()

Method Summary

Methods

Modifier and Type	Method and Description
void	initialize(PluginContext context)
void	shutdown()

Methods inherited from class java.lang.Object

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

Constructor Detail

DatabasePluginLifecycleListener

public DatabasePluginLifecycleListener()

Method Detail

initialize

public void initialize(PluginContext context)
                throws Exception

Specified by:

initialize in interface PluginLifecycleListener

Throws:

Exception

shutdown

public void shutdown()

Specified by:

shutdown in interface PluginLifecycleListener