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package com.sun.appserv.server;
import java.util.Properties;
/**
* lifecycle modules implement <code>com.sun.appserv.server.LifecycleListener</code> interface.
* There is just one method in this interface: <code>handleEvent()</code> which posts server
* lifecycle events to the lifecycle modules.
* <p>
* Upon start up, before initializing its subsystems application server posts lifcycle modules the
* <code>INIT_EVENT</code>. This is followed by server posting the <code>STARTUP_EVENT</code> to the
* lifecycle modules upon which server starts loading and initializaing the applications. Once this
* phase is completed, the <code>READY_EVENT</code> is posted to the lifecycle modules.
* <p>
* When the server is shutdown, server posts the <code>SHUTDOWN_EVENT</code> to the lifecycle modules and
* then shuts down the applications and subsystems. Once this phase is completed the
* <code>TERMINATION_EVENT</code> is posted.
* <p>
* Note that lifecycle modules may obtain the event specific data by calling <code>getData()</code>
* on the event parameter in the <code>handleEvent()</code>. For the INIT_EVENT event,
* <code>getData()</code> returns the lifecycle module's properties configured in server.xml.
* <p>
* When <code>is-failure-fatal</code> in server.xml is set to <code>true</code>, all exceptions from the
* lifecycle modules are treated as fatal conditions.
*/
public interface LifecycleListener {
/** receive a server lifecycle event
* @param event associated event
* @throws <code> ServerLifecycleException </code> for exception condition.
*
*/
public void handleEvent(LifecycleEvent event) throws ServerLifecycleException;
}