Mercurial > dive4elements > gnv-client
annotate geo-backend/src/main/java/de/intevation/gnv/geobackend/base/query/QueryExecutorFactory.java @ 542:f0b6d0e2a0f6
Small fixes for Ehcache based SQL results caching.
geo-backend/trunk@463 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Sat, 19 Dec 2009 14:45:21 +0000 |
parents | 3cbf11c67fdc |
children | 12f88239fb33 |
rev | line source |
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Implementation of the Datainfrastructure for fetching Data from different DataStores.
Tim Englich <tim.englich@intevation.de>
parents:
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1 /** |
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Implementation of the Datainfrastructure for fetching Data from different DataStores.
Tim Englich <tim.englich@intevation.de>
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2 * |
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Implementation of the Datainfrastructure for fetching Data from different DataStores.
Tim Englich <tim.englich@intevation.de>
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3 */ |
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Implementation of the Datainfrastructure for fetching Data from different DataStores.
Tim Englich <tim.englich@intevation.de>
parents:
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4 package de.intevation.gnv.geobackend.base.query; |
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Tim Englich <tim.englich@intevation.de>
parents:
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5 |
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Implementation of the Datainfrastructure for fetching Data from different DataStores.
Tim Englich <tim.englich@intevation.de>
parents:
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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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Tim Englich <tim.englich@intevation.de>
parents:
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9 * @author Tim Englich <tim.englich@intevation.de> |
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Tim Englich <tim.englich@intevation.de>
parents:
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10 * |
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Implementation of the Datainfrastructure for fetching Data from different DataStores.
Tim Englich <tim.englich@intevation.de>
parents:
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11 */ |
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Implementation of the Datainfrastructure for fetching Data from different DataStores.
Tim Englich <tim.englich@intevation.de>
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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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Tim Englich <tim.englich@intevation.de>
parents:
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15 |
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Implementation of the Datainfrastructure for fetching Data from different DataStores.
Tim Englich <tim.englich@intevation.de>
parents:
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16 /** |
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Tim Englich <tim.englich@intevation.de>
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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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Tim Englich <tim.englich@intevation.de>
parents:
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20 |
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Implementation of the Datainfrastructure for fetching Data from different DataStores.
Tim Englich <tim.englich@intevation.de>
parents:
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21 |
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Implementation of the Datainfrastructure for fetching Data from different DataStores.
Tim Englich <tim.englich@intevation.de>
parents:
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22 /** |
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Implementation of the Datainfrastructure for fetching Data from different DataStores.
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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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parents:
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27 /** |
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28 * Basic-Constructor of this Class |
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parents:
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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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Tim Englich <tim.englich@intevation.de>
parents:
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33 |
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Implementation of the Datainfrastructure for fetching Data from different DataStores.
Tim Englich <tim.englich@intevation.de>
parents:
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34 /** |
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Implementation of the Datainfrastructure for fetching Data from different DataStores.
Tim Englich <tim.englich@intevation.de>
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35 * This Method provides an singleton Instance of this Class. |
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Implementation of the Datainfrastructure for fetching Data from different DataStores.
Tim Englich <tim.englich@intevation.de>
parents:
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36 * @return an singleton Instance of this Class |
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parents:
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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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parents:
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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 final QueryExecutorFactory factory = |
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parents:
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45 (QueryExecutorFactory)clazz.newInstance(); |
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46 Runtime.getRuntime().addShutdownHook(new Thread() { |
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47 public void run() { |
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48 factory.shutdown(); |
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49 } |
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50 }); |
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51 return instance = factory; |
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52 } |
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53 catch (ClassNotFoundException cnfe) { |
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54 log.error(cnfe); |
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55 } |
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56 catch (InstantiationException ie) { |
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57 log.error(ie); |
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58 } |
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59 catch(IllegalAccessException iae) { |
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60 log.error(iae); |
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61 } |
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62 catch (ClassCastException cce) { |
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63 log.error(cce); |
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64 } |
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65 } |
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parents:
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66 |
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parents:
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67 instance = new QueryExecutorFactory(); |
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68 } |
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69 return instance; |
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parents:
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70 } |
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parents:
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71 |
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72 public void shutdown() { |
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73 } |
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74 |
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75 /** |
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76 * Getting the QueryExecutor |
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Implementation of the Datainfrastructure for fetching Data from different DataStores.
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77 * @return the QueryExecutor |
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78 */ |
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79 public QueryExecutor getQueryExecutor(){ |
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80 return new DefaultQueryExceutor(); |
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81 } |
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82 } |