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.command; 023 024import com.google.gwt.user.client.rpc.AsyncCallback; 025 026/** 027 * A RemoteCommand can be used to execute a call from client to the server side. The possibility to queue RemoteCommands 028 * is one of the advantages. 029 * 030 * @author sstrohschein 031 * <br>Date: 06.06.2008 032 * <br>Time: 22:40:48 033 */ 034public abstract class DefaultRemoteCommand<T> implements RemoteCommand<T> 035{ 036 private AsyncCallback<T> myCallback; 037 038 /** 039 * Initializes the RemoteCommand with a callback, which can also be used in the execute method 040 * {@link de.novanic.eventservice.client.command.RemoteCommand#execute(de.novanic.eventservice.client.event.service.EventServiceAsync)} 041 * @param aCallback callback 042 */ 043 public void init(AsyncCallback<T> aCallback) { 044 myCallback = aCallback; 045 } 046 047 /** 048 * Checks if the RemoteCommand is initialized with a callback. 049 * @return true when the init method ({@link de.novanic.eventservice.client.command.RemoteCommand#init(com.google.gwt.user.client.rpc.AsyncCallback)}) 050 * was called with a callback, false when the RemoteCommand wasn't initialized with a callback. 051 */ 052 public boolean isInitialized() { 053 return myCallback != null; 054 } 055 056 /** 057 * Returns the callback, which can be set with the link method 058 * ({@link de.novanic.eventservice.client.command.RemoteCommand#init(com.google.gwt.user.client.rpc.AsyncCallback)}) 059 * @return callback 060 */ 061 public AsyncCallback<T> getCallback() { 062 return myCallback; 063 } 064}