hu.mta.sztaki.lpds.cloud.simulator.iaas.statenotifications.PowerStateChangeNotificationHandler.java Source code

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Here is the source code for hu.mta.sztaki.lpds.cloud.simulator.iaas.statenotifications.PowerStateChangeNotificationHandler.java

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/*
 *  ========================================================================
 *  DIScrete event baSed Energy Consumption simulaTor 
 *                                for Clouds and Federations (DISSECT-CF)
 *  ========================================================================
 *  
 *  This file is part of DISSECT-CF.
 *  
 *  DISSECT-CF is free software: you can redistribute it and/or modify it
 *  under the terms of the GNU Lesser General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or (at
 *  your option) any later version.
 *  
 *  DISSECT-CF is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser
 *  General Public License for more details.
 *  
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with DISSECT-CF.  If not, see <http://www.gnu.org/licenses/>.
 *  
 *  (C) Copyright 2014, Gabor Kecskemeti (gkecskem@dps.uibk.ac.at,
 *                                kecskemeti.gabor@sztaki.mta.hu)
 */

package hu.mta.sztaki.lpds.cloud.simulator.iaas.statenotifications;

import org.apache.commons.lang3.tuple.Pair;

import hu.mta.sztaki.lpds.cloud.simulator.energy.powermodelling.PowerState;
import hu.mta.sztaki.lpds.cloud.simulator.iaas.resourcemodel.PowerBehaviorChangeListener;
import hu.mta.sztaki.lpds.cloud.simulator.iaas.resourcemodel.ResourceSpreader;
import hu.mta.sztaki.lpds.cloud.simulator.notifications.SingleNotificationHandler;
import hu.mta.sztaki.lpds.cloud.simulator.notifications.StateDependentEventHandler;

/**
 * implements a notification handler for sending out notifications about power
 * state changes in resource spreaders
 * 
 * @author "Gabor Kecskemeti, Laboratory of Parallel and Distributed Systems, MTA SZTAKI (c) 2015"
 *
 */

public class PowerStateChangeNotificationHandler
        implements SingleNotificationHandler<PowerBehaviorChangeListener, Pair<ResourceSpreader, PowerState>> {

    /**
     * the single object that will handle all notification operations on the
     * same way
     */
    private static final PowerStateChangeNotificationHandler handlerSingleton = new PowerStateChangeNotificationHandler();

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

    private PowerStateChangeNotificationHandler() {
    }

    /**
     * gets the event handler that will manage the notification subscriptions
     * for the particular resource spreader object that asked for the handler.
     * 
     * @return the eventh handler
     */
    public static StateDependentEventHandler<PowerBehaviorChangeListener, Pair<ResourceSpreader, PowerState>> getHandlerInstance() {
        return new StateDependentEventHandler<PowerBehaviorChangeListener, Pair<ResourceSpreader, PowerState>>(
                handlerSingleton);
    }

    /**
     * The event handling mechanism for power state change notifications about
     * resource spreaders
     * 
     * @param onObject
     *            The listener to send the event to
     * @param newPowerBehavior
     *            a data pair containing the resource spreader that changed its
     *            state and the power state that the spreader just switches to.
     */
    @Override
    public void sendNotification(final PowerBehaviorChangeListener onObject,
            final Pair<ResourceSpreader, PowerState> newPowerBehavior) {
        onObject.behaviorChanged(newPowerBehavior.getLeft(), newPowerBehavior.getRight());
    }
}