Metacat

/**

 *  '$RCSfile$'

 *    Purpose: A class that gets Accession Number, check for uniqueness

 *             and register it into db

 *  Copyright: 2000 Regents of the University of California and the

 *             National Center for Ecological Analysis and Synthesis

 *    Authors: Jivka Bojilova, Matt Jones

 *

 *   '$Author: leinfelder $'

 *     '$Date: 2011-11-02 20:40:12 -0700 (Wed, 02 Nov 2011) $'

 * '$Revision: 6595 $'

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program 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 General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 */

package edu.ucsb.nceas.metacat.index;

import java.util.ArrayList;

import java.util.List;

import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;

import org.apache.solr.client.solrj.SolrServer;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.FileSystemXmlApplicationContext;

/**

 * The start class of the index.

 * @author tao

 *

 */

public class ApplicationController {

    private static String SOLRINDEXES = "solrIndexes";

    private static short FIRST = 0;

    private List<SolrIndex> solrIndexes = null;

    private List<SystemMetadataEventListener> sysmetaListeners = new ArrayList<SystemMetadataEventListener>();

    private static ApplicationContext context = null;

    private String springConfigFile = "src/main/resources/index-processor-context.xml";

    Log log = LogFactory.getLog(ApplicationController.class);

    /**

     * Constructor

     */

    public ApplicationController () throws Exception {

        init();

    }

    /**

     * Set the Spring configuration file.

     * @param springConfigFile  the path of the Spring configuration file

     */

    public ApplicationController(String springConfigFile) throws Exception {

        this.springConfigFile = springConfigFile;

        init();

    }

    /**

     * Initialize the list of the SolrIndex objects from the configuration file.

     * Set the SolrServer implementation using the factory.

     * Start listening for events on Hazelcast

     */

    private void init() throws Exception {

        context = getContext();

        solrIndexes = (List<SolrIndex>) context.getBean(SOLRINDEXES);

        // use factory to create the correct impl

    	SolrServer solrServer = null;

		try {

			solrServer = SolrServerFactory.createSolrServer();

		} catch (Exception e) {

			log.error("Could not create SolrServer form factory", e);

			throw e;

		}

        // start the SystemMetadata listener[s] (only expect there to be one)

        for (SolrIndex solrIndex: solrIndexes) {

        	// set the solr server to use

			solrIndex.setSolrServer(solrServer);

			// start listening for events

        	SystemMetadataEventListener smel = new SystemMetadataEventListener();

        	smel.setSolrIndex(solrIndex);

        	smel.start();

        	sysmetaListeners.add(smel);

        }

    }

    /**

     * Get the ApplicaionContext of Spring.

     */

    private ApplicationContext getContext() {

        if (context == null) {

            context = new FileSystemXmlApplicationContext(springConfigFile);

        }

        return context;

    }

    /**

     * Get the path of the Spring configuration file.

     * @return the path of the Spring configuration file.

     */

    public String getSpringConfigFile() {

        return this.springConfigFile;

    }

    /**

     * Get the list of the solr index.

     * @return the list of the solr index.

     */

    public List<SolrIndex> getSolrIndexes() {

        return this.solrIndexes;

    }

    /**

     * Start to generate indexes for those haven't been indexed in another thread.

     */

    public void startIndex() {

        SolrIndex index = solrIndexes.get(FIRST);

        SystemMetadataEventListener listener = sysmetaListeners.get(FIRST);

        IndexGenerator generator = new IndexGenerator(index, listener);

        Thread indexThread = new Thread(generator);

        indexThread.start();

    }

}