001/*
002 * GWTEventService
003 * Copyright (c) 2011 and beyond, strawbill UG (haftungsbeschr?nkt)
004 *
005 * This is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU Lesser General Public License as
007 * published by the Free Software Foundation; either version 3 of
008 * the License, or (at your option) any later version.
009 * Other licensing for GWTEventService may also be possible on request.
010 * Please view the license.txt of the project for more information.
011 *
012 * This software is distributed in the hope that it will be useful,
013 * but WITHOUT ANY WARRANTY; without even the implied warranty of
014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
015 * Lesser General Public License for more details.
016 *
017 * You should have received a copy of the GNU Lesser General Public
018 * License along with this software; if not, write to the Free
019 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
020 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
021 */
022package de.novanic.eventservice.client.connection.strategy.connector;
023
024import com.google.gwt.user.client.rpc.AsyncCallback;
025import de.novanic.eventservice.client.event.DomainEvent;
026import de.novanic.eventservice.client.event.listener.EventNotification;
027import de.novanic.eventservice.client.event.service.EventServiceAsync;
028
029import java.util.List;
030
031/**
032 * The {@link ConnectionStrategyClientConnector} listens for occurred events ({@link de.novanic.eventservice.client.event.Event})
033 * of the server side and has the task to encode / process the transferred events at the client side.
034 *
035 * The {@link DefaultClientConnector} implements the listen method with simple calls to the {@link de.novanic.eventservice.client.event.service.EventServiceAsync}
036 * and no special encoding of the occurred events.
037 *
038 * @author sstrohschein
039 *         <br>Date: 16.04.2010
040 *         <br>Time: 23:24:00
041 */
042public class DefaultClientConnector implements ConnectionStrategyClientConnector
043{
044    private EventServiceAsync myEventService;
045
046    /**
047     * Initializes the {@link de.novanic.eventservice.client.connection.strategy.connector.ConnectionStrategyClientConnector} with
048     * the {@link de.novanic.eventservice.client.event.service.EventServiceAsync}.
049     * @param anEventService the {@link de.novanic.eventservice.client.event.service.EventServiceAsync}
050     */
051    public void init(EventServiceAsync anEventService) {
052        myEventService = anEventService;
053    }
054
055    /**
056     * Deactivates the {@link de.novanic.eventservice.client.connection.strategy.connector.ConnectionStrategyClientConnector}.
057     */
058    public void deactivate() {}
059
060    /**
061     * Checks if the {@link de.novanic.eventservice.client.connection.strategy.connector.ConnectionStrategyClientConnector} is
062     * initialized.
063     * @return true when the {@link de.novanic.eventservice.client.connection.strategy.connector.ConnectionStrategyClientConnector} is
064     * initialized, otherwise false
065     */
066    public boolean isInitialized() {
067        return myEventService != null;
068    }
069
070    /**
071     * The listen method implements the listen / connection strategy to receive occurred events. The occurred events
072     * will be passed to the {@link de.novanic.eventservice.client.event.listener.EventNotification} and to the callback.
073     * The {@link DefaultClientConnector} implements the listen method with simple calls to the {@link de.novanic.eventservice.client.event.service.EventServiceAsync}
074     * and no special encoding of the occurred events.
075     * @param anEventNotification {@link de.novanic.eventservice.client.event.listener.EventNotification} which will be notified about occurred / received events
076     * @param aCallback The callback will be notified about occurred / received events.
077     */
078    public void listen(EventNotification anEventNotification, AsyncCallback<List<DomainEvent>> aCallback) {
079        myEventService.listen(aCallback);
080    }
081}