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.io.File;

import java.io.IOException;

import java.net.URL;

import java.util.List;

import javax.servlet.ServletConfig;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.commons.configuration.ConfigurationException;

import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;

import org.dataone.configuration.Settings;

import edu.ucsb.nceas.metacat.common.query.EnabledQueryEngines;

/**

 * A servlet class for the Metadata Index module. This class only does one thing - initialize the ApplicationController class.

 * @author tao

 *

 */

public class MetacatIndexServlet extends HttpServlet {

    // Use the file prefix to indicate this is a absolute path.

    // see http://www.docjar.com/docs/api/org/springframework/context/support/FileSystemXmlApplicationContext.html

    private static final String FILEPREFIX = "file:";

	private static Log log = LogFactory.getLog(MetacatIndexServlet.class);

    /**

     * Initialize the servlet 

     */

    public void init(ServletConfig config) throws ServletException {

        //System.out.println("++++++++++++++++++++++++------------------- start the servlet");

    	initializeSharedConfiguration(config);

    	/*boolean isSolrEnabled = true;

    	try {

    	   isSolrEnabled = EnabledQueryEngines.getInstance().isEnabled(EnabledQueryEngines.SOLRENGINE);

    	} catch (Exception e) {

    	    throw new ServletException(e.getMessage());

    	}

    	//if the solr query engine is disabled, we stop here.

    	if(!isSolrEnabled) {

    	    return;

    	}*/

    	// initialize the application using the configured application-context

        URL url = getClass().getResource("/index-processor-context.xml");

        //System.out.println("the url is "+url);

        //System.out.println("the path is "+url.getPath());

        //System.out.println("the file is "+url.getPath());

        ApplicationController controller = null;

        try {

             controller = new ApplicationController(FILEPREFIX + url.getFile());

        } catch (Exception e) {

            throw new ServletException(e.getMessage());

        }

        controller.startIndex();//Start to generate indexes for those haven't been indexed in another thread

        //List<SolrIndex> list = controller.getSolrIndexes();

        //System.out.println("++++++++++++++++++++++++------------------- the size is  "+list.size());

    }

    /**

     * Loads the metacat.prioerties into D1 Settings utility

     * this gives us access to all metacat properties as well as 

     * overriding any properties as needed.

     * 

     * Makes sure shared Hazelcast configuration file location is set

     * 

     * @param config the servlet config

     */

    private void initializeSharedConfiguration(ServletConfig config) {

		try {

			// find the sibling metacat.properties file

			String metacatPropertiesFilePath = config.getServletContext().getInitParameter("metacat.properties.path");

			File contextDeploymentDir = new File(config.getServletContext().getRealPath("/"));

			String fullMetacatPropertiesFilePath = contextDeploymentDir.getParent()  + metacatPropertiesFilePath;

			Settings.augmentConfiguration(fullMetacatPropertiesFilePath);

		} catch (ConfigurationException e) {

			log.error("Could not initialize shared Metacat properties. " + e.getMessage(), e);

		}

		// make sure hazelcast configuration is defined so that

		String hzConfigFileName = Settings.getConfiguration().getString("dataone.hazelcast.configFilePath");

		if (hzConfigFileName == null) {

			// use default metacat hazelcast.xml file in metacat deployment

			hzConfigFileName = 

    				Settings.getConfiguration().getString("application.deployDir") +

    				"/" +

    				Settings.getConfiguration().getString("application.context") + 

    				"/WEB-INF/hazelcast.xml";

			// set it for other parts of the code

			Settings.getConfiguration().setProperty("dataone.hazelcast.configFilePath", hzConfigFileName);

			//set data.hazelcast.location.clientconfig. This property will be used in d1_cn_index_processor module.

			//if we don't set this property, d1_cn_index_processor will use the default location /etc/dataone/storage.

			Settings.getConfiguration().setProperty("dataone.hazelcast.location.clientconfig", hzConfigFileName);

		}

    }

    /**

     *Actions needed to be done before close the servlet

     */

    public void destroy() {

     //do nothing

    }

    /** Handle "GET" method requests from HTTP clients */

    public void doGet(HttpServletRequest request, HttpServletResponse response)

    throws ServletException, IOException {

        //do nothing

    }

    /** Handle "POST" method requests from HTTP clients */

    public void doPost(HttpServletRequest request, HttpServletResponse response)

    throws ServletException, IOException {

        //do nothing

    }

}