Java tutorial
/******************************************************************************* * Gisgraphy Project * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA * * Copyright 2008 Gisgraphy project * David Masclet <davidmasclet@gisgraphy.com> * * *******************************************************************************/ package com.gisgraphy.domain.geoloc.service.fulltextsearch; import java.net.MalformedURLException; import java.net.URL; import java.util.logging.Level; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.xpath.XPath; import javax.xml.xpath.XPathFactory; import org.apache.commons.httpclient.HttpClient; import org.apache.commons.httpclient.MultiThreadedHttpConnectionManager; import org.apache.commons.httpclient.methods.PostMethod; import org.apache.solr.client.solrj.SolrServer; import org.apache.solr.client.solrj.impl.CommonsHttpSolrServer; import org.apache.solr.client.solrj.response.SolrPingResponse; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.beans.factory.annotation.Qualifier; import org.springframework.util.Assert; /** * Default implementation for IsolrClient.it represent a client to connect to * solR server * * @author <a href="mailto:david.masclet@gisgraphy.com">David Masclet</a> */ public class SolrClient implements IsolrClient { protected static final Logger logger = LoggerFactory.getLogger(SolrClient.class); private SolrServer server; private MultiThreadedHttpConnectionManager multiThreadedHttpConnectionManager; private String URL; /** * Default constructor needed by spring */ public SolrClient() { super(); } /** * @param solrUrl * The solr URL of the server to connect */ @Autowired public SolrClient(@Qualifier("fulltextSearchUrl") String solrUrl, @Qualifier("multiThreadedHttpConnectionManager") MultiThreadedHttpConnectionManager multiThreadedHttpConnectionManager) { try { Assert.notNull(solrUrl, "solrClient does not accept null solrUrl"); Assert.notNull(multiThreadedHttpConnectionManager, "solrClient does not accept null multiThreadedHttpConnectionManager"); this.multiThreadedHttpConnectionManager = multiThreadedHttpConnectionManager; this.server = new CommonsHttpSolrServer(new URL(solrUrl), new HttpClient(multiThreadedHttpConnectionManager)); this.URL = !solrUrl.endsWith("/") ? solrUrl + "/" : solrUrl; logger.info("connecting to solr on " + this.URL + "..."); } catch (MalformedURLException e) { throw new RuntimeException("Error connecting to Solr! : " + e.getMessage()); } } /* * (non-Javadoc) * * @see com.gisgraphy.domain.geoloc.service.fulltextsearch.IsolrClient#bindToUrl(java.lang.String) */ public void bindToUrl(String solrUrl) { try { this.server = new CommonsHttpSolrServer(new URL(solrUrl)); this.URL = !solrUrl.endsWith("/") ? solrUrl + "/" : solrUrl; logger.info("fulltextSearchUrl for FullTextSearchEngine is changed to " + solrUrl); } catch (Exception e) { throw new RuntimeException("Error connecting to Solr to " + solrUrl); } } /* * (non-Javadoc) * * @see com.gisgraphy.domain.geoloc.service.fulltextsearch.IsolrClient#getConnection() */ public SolrServer getServer() { return this.server; } /* * (non-Javadoc) * * @see com.gisgraphy.domain.geoloc.service.fulltextsearch.IsolrClient#getURL() */ public String getURL() { return URL; } public boolean isServerAlive() { try { DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder(); XPath xpath = XPathFactory.newInstance().newXPath(); if (xpath == null || builder == null) { throw new RuntimeException("Can not determine if fulltext engine is alive"); } SolrPingResponse response = getServer().ping(); if (response == null) { return false; } return ((String) response.getResponse().get("status")).equals("OK"); } catch (Exception e) { logger.error("can not determine if fulltext engine is alive " + e.getMessage()); return false; } } /* (non-Javadoc) * @see com.gisgraphy.domain.geoloc.service.fulltextsearch.IsolrClient#setSolRLogLevel(java.util.logging.Level) */ public void setSolRLogLevel(Level level) { Assert.notNull(level, "you can not specify a null level"); Assert.notNull(multiThreadedHttpConnectionManager, "httpconnectionManager should not be null, can not set log level"); Assert.notNull(URL, "Solr URL should not be null, can not set log level"); HttpClient client = new HttpClient(multiThreadedHttpConnectionManager); PostMethod method = new PostMethod(this.URL + "admin/logging"); method.setParameter("root", level.toString().toUpperCase()); method.setParameter("submit", "set"); try { try { int responseCode = client.executeMethod(method); logger.info("Set solr log Level to " + level); String responseBody = method.getResponseBodyAsString(); if (responseCode >= 500) { throw new RuntimeException("Can not set solr log level to " + level + " because response code is not OK (" + responseCode + "): " + responseBody); } } catch (Exception e) { throw new RuntimeException("Can not set solr log level to " + level, e); } } finally { method.releaseConnection(); } } }