org.figure8.join.util
Class ConnectionKeeperLauncher

java.lang.Object
  org.figure8.join.util.ConnectionKeeperLauncher

All Implemented Interfaces:

java.util.EventListener, javax.servlet.ServletContextListener

public class ConnectionKeeperLauncher
extends java.lang.Object
implements javax.servlet.ServletContextListener

This a launcher for ConnectionKeeper threads implemented as a ServletContextListener.

Version:

$Revision: 1.2 $

Author:

Laurent Broudoux

Field Summary

static java.lang.String	HSQL_KEEPER_KEY Key used for registring the ConnectionKeeper within ServletContext
static int	NB_CONNECTIONS Number of connections to keep open by ConnectionKeeper
static long	SLEEP_TIME Sleeping time of the ConnectionKeeper

Constructor Summary

ConnectionKeeperLauncher()
Creates a new instance of ConnectionKeeperLauncher

Method Summary

void	contextDestroyed(javax.servlet.ServletContextEvent servletContextEvent) Method called when context is destroyed
void	contextInitialized(javax.servlet.ServletContextEvent servletContextEvent) Methad called when context is intialized.
static boolean	startConnectionKeeperIfNecessary() Start a ConnectionKeeper thread only if necessary (ie. keeper has not already been started and database dialect is the one corresponding to Hypersonic SQL DB)
static boolean	stopConnectionKeeperIfNecessary() Stop a ConnectionKeeper thread only if necessary (ie. a keeper already exists !)

Methods inherited from class java.lang.Object

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

Field Detail

NB_CONNECTIONS

public static final int NB_CONNECTIONS

Number of connections to keep open by ConnectionKeeper

See Also:

Constant Field Values

SLEEP_TIME

public static final long SLEEP_TIME

Sleeping time of the ConnectionKeeper

See Also:

Constant Field Values

HSQL_KEEPER_KEY

public static final java.lang.String HSQL_KEEPER_KEY

Key used for registring the ConnectionKeeper within ServletContext

See Also:

Constant Field Values

Constructor Detail

ConnectionKeeperLauncher

public ConnectionKeeperLauncher()

Creates a new instance of ConnectionKeeperLauncher

Method Detail

startConnectionKeeperIfNecessary

public static boolean startConnectionKeeperIfNecessary()

Start a ConnectionKeeper thread only if necessary (ie. keeper has not already been started and database dialect is the one corresponding to Hypersonic SQL DB)

Returns:

true if a keeper has actually been launched

stopConnectionKeeperIfNecessary

public static boolean stopConnectionKeeperIfNecessary()

Stop a ConnectionKeeper thread only if necessary (ie. a keeper already exists !)

Returns:

true if a keeper has actually been stopped, false otherwise

contextInitialized

public void contextInitialized(javax.servlet.ServletContextEvent servletContextEvent)

Methad called when context is intialized.

Specified by:

contextInitialized in interface javax.servlet.ServletContextListener

Parameters:

servletContextEvent - Event received when context is initialized

contextDestroyed

public void contextDestroyed(javax.servlet.ServletContextEvent servletContextEvent)

Method called when context is destroyed

Specified by:

contextDestroyed in interface javax.servlet.ServletContextListener

Parameters:

servletContextEvent - The event corresponding to context desctruction