Mercurial > dive4elements > gnv-client

annotate geo-backend/src/main/java/de/intevation/gnv/geobackend/base/query/QueryExecutorFactory.java @ 1127:ebeb56428409

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Added license headers and license file. geo-backend/trunk@1261 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Tue, 02 Nov 2010 17:52:22 +0000
parents 1985d5db0feb
children
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1 /*
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2 * Copyright (c) 2010 by Intevation GmbH
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3 *
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4 * This program is free software under the LGPL (>=v2.1)
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5 * Read the file LGPL.txt coming with the software for details
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6 * or visit http://www.gnu.org/licenses/ if it does not exist.
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7 */
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9 package de.intevation.gnv.geobackend.base.query;
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11 import de.intevation.gnv.geobackend.config.Configuration;
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13 import org.apache.log4j.Logger;
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14
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15 /**
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16 * @author <a href="mailto:tim.englich@intevation.de">Tim Englich</a>
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17 *
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18 */
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19 public class QueryExecutorFactory {
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20
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21 public static final String QUERY_EXECUTOR_FACTORY = "query.executor.factory";
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23 /**
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24 * the logger, used to log exceptions and additonaly information
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25 */
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26 private static Logger log = Logger.getLogger(QueryExecutorFactory.class);
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29 /**
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30 * The singleton Instance of this Factory.
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31 */
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32 private static QueryExecutorFactory instance = null;
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33
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34 /**
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35 * Basic-Constructor of this Class
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36 */
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37 public QueryExecutorFactory() {
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38 super();
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39 }
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40
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41 /**
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42 * This Method provides an singleton Instance of this Class.
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43 * @return an singleton Instance of this Class
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44 */
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45 public static synchronized QueryExecutorFactory getInstance(){
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46 if (instance == null) {
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47 Configuration config = Configuration.getInstance();
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48
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49 if (config.isCacheEnabled()) {
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50 final QueryExecutorFactory factory =
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51 new CachingQueryExecutorFactory();
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52 Runtime.getRuntime().addShutdownHook(new Thread() {
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53 @Override
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54 public void run() {
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55 factory.shutdown();
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56 }
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57 });
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58 return instance = factory;
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59 }
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61 instance = new QueryExecutorFactory();
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62 }
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63 return instance;
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64 }
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66 public void shutdown() {
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67 }
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69 /**
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70 * Getting the QueryExecutor
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71 * @return the QueryExecutor
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72 */
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73 public QueryExecutor getQueryExecutor(){
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74 return new DefaultQueryExceutor();
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75 }
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76 }
http://dive4elements.wald.intevation.org