001    /*
002     * Sonar, open source software quality management tool.
003     * Copyright (C) 2009 SonarSource SA
004     * mailto:contact AT sonarsource DOT com
005     *
006     * Sonar is free software; you can redistribute it and/or
007     * modify it under the terms of the GNU Lesser General Public
008     * License as published by the Free Software Foundation; either
009     * version 3 of the License, or (at your option) any later version.
010     *
011     * Sonar 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 GNU
014     * Lesser General Public License for more details.
015     *
016     * You should have received a copy of the GNU Lesser General Public
017     * License along with Sonar; if not, write to the Free Software
018     * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
019     */
020    package org.sonar.api.web.gwt.client.webservices;
021    
022    import java.util.ArrayList;
023    import java.util.List;
024    
025    import com.google.gwt.core.client.JavaScriptObject;
026    import com.google.gwt.user.client.Timer;
027    
028    public class SequentialQueries extends Query<VoidResponse> {
029      
030      private List<AjaxQuery<?>> queries = new ArrayList<AjaxQuery<?>>();
031      private int sleepTimeBetweenCbChecks;
032    
033      private SequentialQueries(int sleepTimeBetweenCbChecks) {
034        this.sleepTimeBetweenCbChecks = sleepTimeBetweenCbChecks;
035      }
036    
037      public static SequentialQueries get() {
038        return new SequentialQueries(50);
039      }
040    
041      public static SequentialQueries get(int sleepTimeBetweenCbChecks) {
042        return new SequentialQueries(sleepTimeBetweenCbChecks);
043      }
044      
045      public <R extends ResponsePOJO> SequentialQueries add(Query<R> query, QueryCallBack<R> callback) {
046        queries.add(new AjaxQuery<R>(query, callback));
047        return this;
048      }
049    
050      @Override
051      public void execute(final QueryCallBack<VoidResponse> callback) {
052        for (AjaxQuery<?> query : queries) {
053          query.execute();
054        }
055        Timer queriesMonitor = new Timer() {
056          @Override
057          public void run() {
058            boolean queriesExecuted = true;
059            for (AjaxQuery<?> query : queries) {
060              if (!query.isCompleted()) {
061                queriesExecuted = false;
062                break;
063              }
064            }
065            if (queriesExecuted) {
066              callback.onResponse(new VoidResponse(), null);
067              cancel();
068            }
069          }
070        };
071        queriesMonitor.scheduleRepeating(sleepTimeBetweenCbChecks);
072      }
073      
074      private class AjaxQuery<R extends ResponsePOJO> {
075        private Query<R> query;
076        private QueryCallBack<R> callback;
077        
078        private boolean completed = false;
079    
080        public AjaxQuery(Query<R> query, QueryCallBack<R> callback) {
081          super();
082          this.query = query;
083          this.callback = callback;
084        }
085    
086        private void execute() {
087          QueryCallBack<R> proxy = new QueryCallBack<R>() {
088            public void onError(int errorCode, String errorMessage) {
089              callback.onError(errorCode, errorMessage);
090              completed = true;
091            }
092    
093            public void onResponse(R response, JavaScriptObject jsonRawResponse) {
094              callback.onResponse(response, jsonRawResponse);
095              completed = true;
096            }
097    
098            public void onTimeout() {
099              callback.onTimeout();
100              completed = true;
101            }
102          };
103          query.execute(proxy);
104        }
105    
106        public boolean isCompleted() {
107          return completed;
108        }
109        
110      }
111    
112    }