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A LWM2M client and server based on Californium (CoAP) all in one.
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/*******************************************************************************
 * Copyright (c) 2017 RISE SICS AB.
 * 
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * and Eclipse Distribution License v1.0 which accompany this distribution.
 * 
 * The Eclipse Public License is available at
 *    http://www.eclipse.org/legal/epl-v10.html
 * and the Eclipse Distribution License is available at
 *    http://www.eclipse.org/org/documents/edl-v10.html.
 * 
 * Contributors:
 *     RISE SICS AB - initial API and implementation
 *******************************************************************************/
package org.eclipse.leshan.server.queue;

import java.util.concurrent.ScheduledFuture;

/**
 * Class that contains all the necessary elements to handle the queue mode. Every registration object that uses Queue
 * Mode has a PresenceStatus object linked to it for handling this mode.
 */

public class PresenceStatus {

    /* The state of the client: Awake or Sleeping */
    private Presence state;

    private ScheduledFuture clientScheduledFuture;

    public PresenceStatus() {
        this.state = Presence.SLEEPING;
    }

    /* Client State Control */

    /**
     * Set the client state to awake. This should be called when an update message is received from the server. It
     * starts the client awake timer.
     * 
     * @return true if the state was changed (previous state was {@link Presence#SLEEPING}
     */
    public boolean setAwake() {
        if (state == Presence.SLEEPING) {
            state = Presence.AWAKE;
            return true;
        }
        return false;
    }

    /**
     * Set the client state to sleeping. This should be called when the the time the client waits before going to sleep
     * expires, or when the client is not responding. It also notifies the listeners inside the {@link PresenceService}.
     * It stops the client awake timer.
     */

    /**
     * Set the client state to sleeping. This should be called when the the time the client waits before going to sleep
     * expires, or when the client is not responding. It also notifies the listeners inside the {@link PresenceService}.
     * It stops the client awake timer.
     * 
     * @return true if the state was changed (previous state was {@link Presence#AWAKE}
     */
    public boolean setSleeping() {
        if (state == Presence.AWAKE) {
            state = Presence.SLEEPING;
            return true;
        }
        return false;
    }

    /**
     * Tells if the client is awake or not
     * 
     * @return true if the status is {@link Presence#Awake}
     */
    public boolean isClientAwake() {
        return state == Presence.AWAKE;
    }

    /* Control of the time the client waits before going to sleep */

    /**
     * Sets the client scheduled task future, in order to cancel it.
     * 
     * @param clientScheduledFuture the scheduled future of the task.
     */
    public void setClientExecutorFuture(ScheduledFuture clientScheduledFuture) {
        this.clientScheduledFuture = clientScheduledFuture;
    }

    /**
     * Gets the client scheduled task future, in order to cancel it.
     * 
     * @return the client scheduled task future.
     */
    public ScheduledFuture getClientScheduledFuture() {
        return this.clientScheduledFuture;
    }

}