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A LWM2M client and server based on Californium (CoAP) all in one.
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/*******************************************************************************
 * Copyright (c) 2013-2015 Sierra Wireless and others.
 * 
 * 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:
 *     Sierra Wireless - initial API and implementation
 *******************************************************************************/
package org.eclipse.leshan.server.observation;

import java.util.Set;

import org.eclipse.leshan.core.observation.Observation;
import org.eclipse.leshan.server.registration.Registration;

/**
 * A service keeping track observation. Can be used for finding observations and cancel them.
 */
public interface ObservationService {

    /**
     * Cancels all active observations of resource(s) implemented by a particular LWM2M registration.
     * 
     * As a consequence the LWM2M Client will stop sending notifications about updated values of resources in scope of
     * the canceled observation.
     * 
     * @param registration the LWM2M Client to cancel observations for
     * @return the number of canceled observations
     */
    int cancelObservations(Registration registration);

    /**
     * Cancels all active observations for the given resource of a given registration.
     * 
     * As a consequence the LWM2M Client will stop sending notifications about updated values of resources in scope of
     * the canceled observation.
     * 
     * @param registration the LWM2M Client to cancel observation for
     * @param resourcepath resource to cancel observation for
     * @return the number of canceled observations
     */
    int cancelObservations(Registration registration, String resourcepath);

    /**
     * Cancels an observation.
     * 
     * As a consequence the LWM2M Client will stop sending notifications about updated values of resources in scope of
     * the canceled observation.
     * 
     * @param observation the observation to cancel.
     */
    void cancelObservation(Observation observation);

    /**
     * Get all running observation for a given registration
     * 
     * @return an unmodifiable set of observation
     */
    Set getObservations(Registration registration);

    void addListener(ObservationListener listener);

    void removeListener(ObservationListener listener);
}