001    /**
002     * Copyright (c) 2000-present Liferay, Inc. All rights reserved.
003     *
004     * This library is free software; you can redistribute it and/or modify it under
005     * the terms of the GNU Lesser General Public License as published by the Free
006     * Software Foundation; either version 2.1 of the License, or (at your option)
007     * any later version.
008     *
009     * This library is distributed in the hope that it will be useful, but WITHOUT
010     * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
011     * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
012     * details.
013     */
014    
015    package com.liferay.portal.kernel.concurrent;
016    
017    import java.util.concurrent.ExecutionException;
018    import java.util.concurrent.Future;
019    
020    /**
021     * @author Shuyang Zhou
022     */
023    public class BaseFutureListener<T> implements FutureListener<T> {
024    
025            @Override
026            public final void complete(Future<T> future) {
027                    if (future.isCancelled()) {
028                            completeWithCancel(future);
029    
030                            return;
031                    }
032    
033                    try {
034                            completeWithResult(future, future.get());
035                    }
036                    catch (Throwable t) {
037                            if (t instanceof ExecutionException) {
038                                    t = t.getCause();
039                            }
040    
041                            completeWithException(future, t);
042                    }
043            }
044    
045            public void completeWithCancel(Future<T> future) {
046            }
047    
048            public void completeWithException(Future<T> future, Throwable throwable) {
049            }
050    
051            public void completeWithResult(Future<T> future, T result) {
052            }
053    
054    }