org.directwebremoting.impl
Class AbstractServerLoadMonitor

java.lang.Object
  org.directwebremoting.impl.AbstractServerLoadMonitor

All Implemented Interfaces:

ServerLoadMonitor, UninitializingBean

Direct Known Subclasses:

DefaultServerLoadMonitor, PollingServerLoadMonitor, SmallSiteServerLoadMonitor, ThreadDroppingServerLoadMonitor, ThrottlingServerLoadMonitor

public abstract class AbstractServerLoadMonitor
extends java.lang.Object
implements ServerLoadMonitor, UninitializingBean

A base implementation of ServerLoadMonitor that implements waiting functionality, mostly to provide ServletContextListener.contextDestroyed(javax.servlet.ServletContextEvent)

Author:

Joe Walker [joe at getahead dot ltd dot uk]

Constructor Summary

AbstractServerLoadMonitor()

Method Summary

void	contextDestroyed() Called when a ServletContext is being destroyed.
void	servletDestroyed() Called when GenericServlet.destroy() is called.
void	shutdownRandomWaitControllers(int count) If there are too many WaitControllers waiting then we can kill one off at random.
void	threadWaitEnding(WaitController controller) A thread has just ended a wait period.
void	threadWaitStarting(WaitController controller) A thread is about to begin a wait period.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.directwebremoting.extend.ServerLoadMonitor

getConnectedTime, getDisconnectedTime, supportsStreaming

Constructor Detail

AbstractServerLoadMonitor

public AbstractServerLoadMonitor()

Method Detail

servletDestroyed

public void servletDestroyed()

Description copied from interface: UninitializingBean

Called when GenericServlet.destroy() is called. This event is the preferred time to close resources that don't require all connections to be closed. The servletDestroy method is far more likely to be called.

Specified by:

servletDestroyed in interface UninitializingBean

contextDestroyed

public void contextDestroyed()

Description copied from interface: UninitializingBean

Called when a ServletContext is being destroyed. DWR finds out about this destruction if (and only if) in web.xml there is a DwrListener registered. This happens before the GenericServlet.destroy() is called.

If DwrListener is not registered, this will not happen

This method should only be used when we need to take action to enable the servlet to stop cleanly. Typically this will be restricted to stopping reverse ajax threads.

Specified by:

contextDestroyed in interface UninitializingBean

threadWaitStarting

public void threadWaitStarting(WaitController controller)

Description copied from interface: ServerLoadMonitor

A thread is about to begin a wait period. This can be used by implementations to dynamically adjust the poll timings.

Specified by:

threadWaitStarting in interface ServerLoadMonitor

Parameters:

controller - An object that we can use to control the wait

threadWaitEnding

public void threadWaitEnding(WaitController controller)

Description copied from interface: ServerLoadMonitor

A thread has just ended a wait period. This can be used by implementations to dynamically adjust the poll timings.

Specified by:

threadWaitEnding in interface ServerLoadMonitor

Parameters:

controller - An object that we can use to control the wait

shutdownRandomWaitControllers

public void shutdownRandomWaitControllers(int count)

If there are too many WaitControllers waiting then we can kill one off at random.

Parameters:

count - How many WaitControllers do we shutdown?