org.atmosphere.cpr.BroadcasterCache Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of atmosphere-runtime Show documentation
There is a newer version: 3.0.13
/*
 * Copyright 2013 Jeanfrancois Arcand
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
/*
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2007-2008 Sun Microsystems, Inc. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
 * identifying information: "Portions Copyrighted [year]
 * [name of copyright owner]"
 *
 * Contributor(s):
 *
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */
package org.atmosphere.cpr;

import java.util.List;

/**
 * A BroadcasterCache is used to persist broadcasted Object {@link Broadcaster#broadcast(Object)}. Disconnected clients
 * can always retrieve message that were broadcasted during their "downtime". {@link BroadcasterCache} are useful when
 * a the long polling technique is used and prevent application from loosing event between re-connection.
 * 
 * A BroadcasterCache can be configured by invoking {@link org.atmosphere.cpr.BroadcasterConfig#setBroadcasterCache(BroadcasterCache)} by
 * defining it in your web/application.xml or by using the {@link org.atmosphere.config.service.BroadcasterCacheService}
 *
 */
public interface BroadcasterCache {

    public final static String BROADCASTER_CACHE_TRACKER = BroadcasterCache.class.getName();

    public enum STRATEGY { BEFORE_FILTER, AFTER_FILTER }

    /**
     * Start
     */
    void start();

    /**
     * Stop
     */
    void stop();

    /**
     * Start tracking messages associated with {@link AtmosphereResource} from the cache
     *
     * @param r {@link AtmosphereResource}
     * @param e a broadcasted message.
     */
    void addToCache(String id, AtmosphereResource r, Object e);

    /**
     * Retrieve messages associated with {@link AtmosphereResource}
     *
     * @param r {@link AtmosphereResource}
     * @return a {@link List} of messages (String).
     */
    List