hu.mta.sztaki.lpds.cloud.simulator.iaas.statenotifications
Class VMStateChangeNotificationHandler

java.lang.Object
  hu.mta.sztaki.lpds.cloud.simulator.iaas.statenotifications.VMStateChangeNotificationHandler

All Implemented Interfaces:

SingleNotificationHandler<VirtualMachine.StateChange,org.apache.commons.lang3.tuple.Triple<VirtualMachine,VirtualMachine.State,VirtualMachine.State>>

public class VMStateChangeNotificationHandler
extends Object
implements SingleNotificationHandler<VirtualMachine.StateChange,org.apache.commons.lang3.tuple.Triple<VirtualMachine,VirtualMachine.State,VirtualMachine.State>>

implements a notification handler for sending out notifications about VM state changes

Author:

"Gabor Kecskemeti, Laboratory of Parallel and Distributed Systems, MTA SZTAKI (c) 2015"

Field Summary

private static VMStateChangeNotificationHandler

handlerSingleton the singleton notification sender object that will send out all notifications about a VM state changes on a uniform way

Constructor Summary

private

VMStateChangeNotificationHandler() disables the instantiation of the handler so we really just have a single instance for all handling operations

Method Summary

static StateDependentEventHandler<VirtualMachine.StateChange,org.apache.commons.lang3.tuple.Triple<VirtualMachine,VirtualMachine.State,VirtualMachine.State>>	getHandlerInstance() gets the event handler that will manage the subscriptions for the particular VM object that asked for the handler.
void	sendNotification(VirtualMachine.StateChange onObject, org.apache.commons.lang3.tuple.Triple<VirtualMachine,VirtualMachine.State,VirtualMachine.State> stateData) The event handling mechanism for VM state change notifications

Methods inherited from class java.lang.Object

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

Field Detail

handlerSingleton

private static final VMStateChangeNotificationHandler handlerSingleton

the singleton notification sender object that will send out all notifications about a VM state changes on a uniform way

Constructor Detail

VMStateChangeNotificationHandler

private VMStateChangeNotificationHandler()

disables the instantiation of the handler so we really just have a single instance for all handling operations

Method Detail

getHandlerInstance

public static StateDependentEventHandler<VirtualMachine.StateChange,org.apache.commons.lang3.tuple.Triple<VirtualMachine,VirtualMachine.State,VirtualMachine.State>> getHandlerInstance()

gets the event handler that will manage the subscriptions for the particular VM object that asked for the handler. One should be requested for every VM that expects to send out state change notifications.

Returns:

the eventh handler

sendNotification

public void sendNotification(VirtualMachine.StateChange onObject,
                             org.apache.commons.lang3.tuple.Triple<VirtualMachine,VirtualMachine.State,VirtualMachine.State> stateData)

The event handling mechanism for VM state change notifications

Specified by:

sendNotification in interface SingleNotificationHandler<VirtualMachine.StateChange,org.apache.commons.lang3.tuple.Triple<VirtualMachine,VirtualMachine.State,VirtualMachine.State>>

Parameters:

onObject - The listener to send the event to

stateData - a data triplet containing the VM and its the past and future states.