org.openmrs.module.solr.SolrEngine.java Source code

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Here is the source code for org.openmrs.module.solr.SolrEngine.java

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/**
 * The contents of this file are subject to the OpenMRS Public License
 * Version 1.0 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://license.openmrs.org
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
 * License for the specific language governing rights and limitations
 * under the License.
 *
 * Copyright (C) OpenMRS, LLC.  All Rights Reserved.
 */
package org.openmrs.module.solr;

import java.io.File;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.solr.client.solrj.SolrServer;
import org.apache.solr.client.solrj.embedded.EmbeddedSolrServer;
import org.apache.solr.core.CoreContainer;
import org.openmrs.api.context.Context;
import org.openmrs.util.OpenmrsUtil;

/**
 * Managers the solr server connection. It can be an embedded instance or an external one.
 */
public class SolrEngine {

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

    private SolrServer solrServer;

    private SolrEngine() {

    }

    private static class SolrEngineHolder {

        private static SolrEngine INSTANCE = null;
    }

    private void init() throws Exception {
        String solrHome = Context.getAdministrationService().getGlobalProperty("solr.home",
                new File(OpenmrsUtil.getApplicationDataDirectory(), "solr").getAbsolutePath());

        System.setProperty("solr.solr.home", solrHome);

        CoreContainer.Initializer initializer = new CoreContainer.Initializer();
        CoreContainer coreContainer = initializer.initialize();
        solrServer = new EmbeddedSolrServer(coreContainer, "");
    }

    /**
     * Get the static/singular instance of the module class loader
     * 
     * @return OpenmrsClassLoader
     */
    public static SolrEngine getInstance() throws Exception {
        if (SolrEngineHolder.INSTANCE == null) {
            SolrEngineHolder.INSTANCE = new SolrEngine();
            SolrEngineHolder.INSTANCE.init();
        }

        return SolrEngineHolder.INSTANCE;
    }

    /**
     * Gets an instance of the solr server
     * 
     * @return SolrServer
     */
    public SolrServer getServer() {
        return solrServer;
    }
}