org.sonar.api.web.gwt.client.webservices.SequentialQueries.java Source code

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Here is the source code for org.sonar.api.web.gwt.client.webservices.SequentialQueries.java

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/*
 * Sonar, open source software quality management tool.
 * Copyright (C) 2008-2011 SonarSource
 * mailto:contact AT sonarsource DOT com
 *
 * Sonar is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * Sonar is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with Sonar; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
 */
package org.sonar.api.web.gwt.client.webservices;

import java.util.ArrayList;
import java.util.List;

import com.google.gwt.core.client.JavaScriptObject;
import com.google.gwt.user.client.Timer;

public class SequentialQueries extends Query<VoidResponse> {

    private List<AjaxQuery<?>> queries = new ArrayList<AjaxQuery<?>>();
    private int sleepTimeBetweenCbChecks;

    private SequentialQueries(int sleepTimeBetweenCbChecks) {
        this.sleepTimeBetweenCbChecks = sleepTimeBetweenCbChecks;
    }

    public static SequentialQueries get() {
        return new SequentialQueries(50);
    }

    public static SequentialQueries get(int sleepTimeBetweenCbChecks) {
        return new SequentialQueries(sleepTimeBetweenCbChecks);
    }

    public <R extends ResponsePOJO> SequentialQueries add(Query<R> query, QueryCallBack<R> callback) {
        queries.add(new AjaxQuery<R>(query, callback));
        return this;
    }

    @Override
    public void execute(final QueryCallBack<VoidResponse> callback) {
        for (AjaxQuery<?> query : queries) {
            query.execute();
        }
        Timer queriesMonitor = new Timer() {
            @Override
            public void run() {
                boolean queriesExecuted = true;
                for (AjaxQuery<?> query : queries) {
                    if (!query.isCompleted()) {
                        queriesExecuted = false;
                        break;
                    }
                }
                if (queriesExecuted) {
                    callback.onResponse(new VoidResponse(), null);
                    cancel();
                }
            }
        };
        queriesMonitor.scheduleRepeating(sleepTimeBetweenCbChecks);
    }

    private class AjaxQuery<R extends ResponsePOJO> {
        private Query<R> query;
        private QueryCallBack<R> callback;

        private boolean completed = false;

        public AjaxQuery(Query<R> query, QueryCallBack<R> callback) {
            super();
            this.query = query;
            this.callback = callback;
        }

        private void execute() {
            QueryCallBack<R> proxy = new QueryCallBack<R>() {
                public void onError(int errorCode, String errorMessage) {
                    callback.onError(errorCode, errorMessage);
                    completed = true;
                }

                public void onResponse(R response, JavaScriptObject jsonRawResponse) {
                    callback.onResponse(response, jsonRawResponse);
                    completed = true;
                }

                public void onTimeout() {
                    callback.onTimeout();
                    completed = true;
                }
            };
            query.execute(proxy);
        }

        public boolean isCompleted() {
            return completed;
        }

    }

}