er.extensions.components
Class ERXGracefulShutdown

java.lang.Object
  er.extensions.components.ERXGracefulShutdown

All Implemented Interfaces:

sun.misc.SignalHandler

public class ERXGracefulShutdown
extends java.lang.Object
implements sun.misc.SignalHandler

Graceful shutdown adds signal handling support for gracefully terminating a WOApplication. The default implementation in ERXApplication simply calls the terminate method. By default only the TERM and INT signals are registered to handle.

Nested Class Summary

static interface

ERXGracefulShutdown.GracefulApplication Interface to be implemented by the WOApplication subclass to gracefully handle termination.

Field Summary

protected sun.misc.SignalHandler	defaultHandler caches the previous handler for chaining
static org.apache.log4j.Logger	log logging support

Fields inherited from interface sun.misc.SignalHandler

SIG_DFL, SIG_IGN

Constructor Summary

ERXGracefulShutdown()

Method Summary

sun.misc.SignalHandler	defaultHandler()
void	handle(sun.misc.Signal signal) Signal handling method.
static void	installHandler() Installs signal handlers for the given array of signals.
static boolean	isEnabled() Determines if signal handling is enabled.
void	setDefaultHandler(sun.misc.SignalHandler value)

Methods inherited from class java.lang.Object

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

Field Detail

log

public static final org.apache.log4j.Logger log

logging support

defaultHandler

protected sun.misc.SignalHandler defaultHandler

caches the previous handler for chaining

Constructor Detail

ERXGracefulShutdown

public ERXGracefulShutdown()

Method Detail

isEnabled

public static boolean isEnabled()

Determines if signal handling is enabled. Defaults to false.

Returns:

if signal handling is enabled

installHandler

public static void installHandler()

Installs signal handlers for the given array of signals. Default signals to catch are TERM and INT. The previous handler is saved to chain back to if anything goes wrong with the graceful termination method.

handle

public void handle(sun.misc.Signal signal)

Signal handling method. Gracefully terminates the currently running WOApplication.

Specified by:

handle in interface sun.misc.SignalHandler

Parameters:

signal - to be handled

defaultHandler

public sun.misc.SignalHandler defaultHandler()

Returns:

the default handler

setDefaultHandler

public void setDefaultHandler(sun.misc.SignalHandler value)