Mercurial > dive4elements > gnv-client

annotate geo-backend/src/main/java/de/intevation/gnv/geobackend/base/query/QueryExecutorFactory.java @ 541:3cbf11c67fdc

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Experimental caching of SQL results via Ehache geo-backend/trunk@462 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Fri, 18 Dec 2009 16:13:52 +0000
parents 5a583cff97ea
children f0b6d0e2a0f6
rev   line source
132
5a583cff97ea Implementation of the Datainfrastructure for fetching Data from different DataStores.
Tim Englich <tim.englich@intevation.de>
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1 /**
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2 *
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3 */
5a583cff97ea Implementation of the Datainfrastructure for fetching Data from different DataStores.
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4 package de.intevation.gnv.geobackend.base.query;
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5
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6 import org.apache.log4j.Logger;
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7
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Tim Englich <tim.englich@intevation.de>
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8 /**
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9 * @author Tim Englich <tim.englich@intevation.de>
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10 *
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Tim Englich <tim.englich@intevation.de>
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11 */
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12 public class QueryExecutorFactory {
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13
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14 public static final String QUERY_EXECUTOR_FACTORY = "query.executor.factory";
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15
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16 /**
5a583cff97ea Implementation of the Datainfrastructure for fetching Data from different DataStores.
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17 * the logger, used to log exceptions and additonaly information
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18 */
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19 private static Logger log = Logger.getLogger(QueryExecutorFactory.class);
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20
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21
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Tim Englich <tim.englich@intevation.de>
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22 /**
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23 * The singleton Instance of this Factory.
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24 */
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25 private static QueryExecutorFactory instance = null;
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26
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27 /**
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28 * Basic-Constructor of this Class
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29 */
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30 public QueryExecutorFactory() {
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31 super();
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32 }
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33
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34 /**
5a583cff97ea Implementation of the Datainfrastructure for fetching Data from different DataStores.
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35 * This Method provides an singleton Instance of this Class.
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36 * @return an singleton Instance of this Class
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37 */
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38 public static synchronized QueryExecutorFactory getInstance(){
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39 if (instance == null) {
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40 String className = System.getProperty(QUERY_EXECUTOR_FACTORY);
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41 if (className != null) {
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42 try {
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43 Class clazz = Class.forName(className);
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44 instance = (QueryExecutorFactory)clazz.newInstance();
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45 return instance;
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46 }
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47 catch (ClassNotFoundException cnfe) {
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48 log.error(cnfe);
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49 }
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50 catch (InstantiationException ie) {
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51 log.error(ie);
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52 }
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53 catch(IllegalAccessException iae) {
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54 log.error(iae);
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55 }
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56 catch (ClassCastException cce) {
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57 log.error(cce);
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58 }
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59 }
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60
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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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65
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66
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67 /**
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68 * Getting the QueryExecutor
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69 * @return the QueryExecutor
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70 */
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71 public QueryExecutor getQueryExecutor(){
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72 return new DefaultQueryExceutor();
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73 }
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74 }
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