/*
    * Copyright (c) 2002-2021, City of Paris
    * All rights reserved.
    *
    * Redistribution and use in source and binary forms, with or without
    * modification, are permitted provided that the following conditions
    * are met:
    *
    *  1. Redistributions of source code must retain the above copyright notice
   *     and the following disclaimer.
   *
   *  2. Redistributions in binary form must reproduce the above copyright notice
   *     and the following disclaimer in the documentation and/or other materials
   *     provided with the distribution.
   *
   *  3. Neither the name of 'Mairie de Paris' nor 'Lutece' nor the names of its
   *     contributors may be used to endorse or promote products derived from
   *     this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
   * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   * POSSIBILITY OF SUCH DAMAGE.
   *
   * License 1.0
   */
  package fr.paris.lutece.plugins.search.solr.business;
  
  import fr.paris.lutece.portal.service.util.AppLogService;
  import fr.paris.lutece.portal.service.util.AppPropertiesService;
  import org.apache.solr.client.solrj.SolrClient;
  import org.apache.solr.client.solrj.impl.Http2SolrClient;
  
  /**
   * This service provides an instance of SolrServer.
   *
   */
  public final class SolrServerService
  {
      private static final String PROPERTY_SOLR_SERVER_URL = "solr.server.address";
      private static final String PROPERTY_SOLR_TIMEOUT = "solr.server.timeout";
      private static final String PROPERTY_SOLR_IDLE_TIMEOUT = "solr.idle.timeout";
      private static final String PROPERTY_SOLR_USE_HTTP1_1 = "solr.use.http1_1";
      private static final String PROPERTY_SOLR_HTTP_BASIC_AUTH_USER = "solr.httpBasicAuthUser";
      private static final String PROPERTY_SOLR_HTTP_BASIC_AUTH_PASSWORD = "solr.httpBasicAuthPassword";
          
      private static final String SOLR_SERVER_URL = AppPropertiesService.getProperty( PROPERTY_SOLR_SERVER_URL );
      private static final int SOLR_CONNECTION_TIMEOUT = AppPropertiesService.getPropertyInt( PROPERTY_SOLR_TIMEOUT, 60000 );
      private static final int SOLR_IDLE_TIMEOUT = AppPropertiesService.getPropertyInt( PROPERTY_SOLR_IDLE_TIMEOUT, 600000 );
  
      private static final boolean SOLR_USE_HTTP1_1 = AppPropertiesService.getPropertyBoolean( PROPERTY_SOLR_USE_HTTP1_1, Boolean.FALSE );
      private static final String SOLR_HTTP_BASIC_AUTH_USER = AppPropertiesService.getProperty( PROPERTY_SOLR_HTTP_BASIC_AUTH_USER );
      private static final String SOLR_HTTP_BASIC_AUTH_PASSWORD = AppPropertiesService.getProperty( PROPERTY_SOLR_HTTP_BASIC_AUTH_PASSWORD );
      private static SolrServerService _instance;
      private SolrClient _solrServer;
  
      /**
       * Private constructor that creates the SolrServer.
       */
      private SolrServerService( )
      {
          _solrServer = createSolrServer( SOLR_SERVER_URL );
      }
  
      /**
       * Return the instance.
       * 
       * @return the instance.
       */
      public static SolrServerService getInstance( )
      {
          if ( _instance == null )
          {
              _instance = new SolrServerService( );
          }
  
          return _instance;
      }
  
      /**
       * Returns the SolrServer.
       * 
       * @return the SolrServer
       */
      public SolrClient getSolrServer( )
      {
          if ( _solrServer == null )
          {
              _solrServer = createSolrServer( SOLR_SERVER_URL );
          }
  
          return _solrServer;
     }
 
     /**
      * Creates the SolrServer.
      * 
      * @param strServerUrl
      *            the Solr server url
      * @return the SolrServer.
      */
     private SolrClient createSolrServer( String strServerUrl )
     {
         AppLogService.info("Connection Solr configured on " + strServerUrl + " using http/" + (SOLR_USE_HTTP1_1 ? "1.1" : "2"));
         return new Http2SolrClient.Builder(strServerUrl)
                 .connectionTimeout(SOLR_CONNECTION_TIMEOUT)
                 .idleTimeout(SOLR_IDLE_TIMEOUT)
                 .withBasicAuthCredentials(SOLR_HTTP_BASIC_AUTH_USER, SOLR_HTTP_BASIC_AUTH_PASSWORD)
                 .useHttp1_1(SOLR_USE_HTTP1_1).build();
     }
 }