001/**
002 * Copyright (C) 2014  Universidade de Aveiro, DETI/IEETA, Bioinformatics Group - http://bioinformatics.ua.pt/
003 *
004 * This file is part of Dicoogle/dicoogle.
005 *
006 * Dicoogle/dicoogle is free software: you can redistribute it and/or modify
007 * it under the terms of the GNU General Public License as published by
008 * the Free Software Foundation, either version 3 of the License, or
009 * (at your option) any later version.
010 *
011 * Dicoogle/dicoogle is distributed in the hope that it will be useful,
012 * but WITHOUT ANY WARRANTY; without even the implied warranty of
013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
014 * GNU General Public License for more details.
015 *
016 * You should have received a copy of the GNU General Public License
017 * along with Dicoogle.  If not, see <http://www.gnu.org/licenses/>.
018 */
019package pt.ua.dicoogle.server.web;
020
021import java.util.concurrent.CountDownLatch;
022import java.util.concurrent.ExecutionException;
023
024import pt.ua.dicoogle.sdk.datastructs.SearchResult;
025import pt.ua.dicoogle.sdk.task.JointQueryTask;
026import pt.ua.dicoogle.sdk.task.Task;
027
028public class FirstResponserQueryHolder extends JointQueryTask {
029        
030        private Iterable<SearchResult> result;
031
032        @Override
033        public void onReceive(Task<Iterable<SearchResult>> e) {
034                try {
035                        synchronized (this) {
036                                if(result == null){
037                                        result = e.get();
038                                        stopAllTaks();
039                                }
040                        }
041
042                        notifyAll();
043                        
044                } catch (InterruptedException | ExecutionException e1) {
045                        // TODO Auto-generated catch block
046                        e1.printStackTrace();
047                }
048        }
049
050        public FirstResponserQueryHolder(CountDownLatch latch) {
051                super();
052        }
053
054        private void stopAllTaks() {
055                this.cancel(true);
056        }
057
058        @Override
059        public void onCompletion() {
060                // TODO: MAY BE BUGGED
061                notifyAll();
062        }
063        
064        public Iterable<SearchResult> getResult() {
065                synchronized (this) {
066                        while( !(this.isCancelled() || this.isDone())){
067                                if(result != null)
068                                        return result;
069                                
070                                try {
071                                        wait();
072                                } catch (InterruptedException e) {
073                                        // TODO Auto-generated catch block
074                                        e.printStackTrace();
075                                }
076                        }
077                }
078                return null;
079        }
080
081
082        
083        
084
085        
086}