org.grycap.gpf4med.StudyManager.java Source code

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Here is the source code for org.grycap.gpf4med.StudyManager.java

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/*
 * Copyright 2013 Institute for Molecular Imaging Instrumentation (I3M)
 * 
 * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by 
 * the European Commission - subsequent versions of the EUPL (the "Licence");
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at:
 * 
 *   http://ec.europa.eu/idabc/eupl
 * 
 * Unless required by applicable law or agreed to in writing, software 
 * distributed under the Licence is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing permissions and 
 * limitations under the Licence.
 * 
 * This product combines work with different licenses. See the "NOTICE" text
 * file for details on the various modules and licenses.
 * The "NOTICE" text file is part of the distribution. Any derivative works
 * that you distribute must include a readable copy of the "NOTICE" text file.
 */

package org.grycap.gpf4med;

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkState;

import java.net.URL;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import org.apache.commons.lang.StringUtils;
import org.grycap.gpf4med.data.GraphDatabaseHandler;
import org.grycap.gpf4med.ext.GraphConnector;
import org.grycap.gpf4med.ext.GraphConnectorManager;

import com.google.common.collect.ImmutableList;

/**
 * Manages the study environment.
 * @author Erik Torres <ertorser@upv.es>
 */
public enum StudyManager {

    INSTANCE;

    public void create(final String graph, final ImmutableList<URL> urls) {
        checkArgument(StringUtils.isNotBlank(graph), "Uninitialized or invalid graph");
        checkArgument(urls != null, "Uninitialized URLs");
        // find a suitable graph connector
        final GraphConnector connector = GraphConnectorManager.INSTANCE.getConnector(graph);
        checkState(connector != null, "Unsupported graph: " + graph);
        // release any previous graph and set the total number of submitted reports
        destroy();
        GraphDatabaseHandler.INSTANCE.setConnector(connector);
        Statistics.INSTANCE.setTotalSubmitted(urls.size());
        // start asynchronously load
        final ExecutorService executor = Executors.newSingleThreadExecutor();
        executor.execute(new Runnable() {
            @Override
            public void run() {
                DocumentFetcher.INSTANCE.fecth(urls);
            }
        });
    }

    public void destroy() {
        // restart data stores and facilities, including statistics restart
        FileQueue.INSTANCE.restart();
        DocumentQueue.INSTANCE.restart();
        GraphDatabaseHandler.INSTANCE.restart();
        Statistics.INSTANCE.setTotalSubmitted(0);
    }

}