Mercurial > dive4elements > gnv-client

annotate geo-backend/src/main/java/de/intevation/gnv/geobackend/base/query/QueryExecutorFactory.java @ 1122:1985d5db0feb

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Implemented a global configuration that should be used to initialize the geobackend. geo-backend/trunk@1149 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Thu, 03 Jun 2010 13:31:07 +0000
parents b757def3ff55
children ebeb56428409
rev   line source
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5a583cff97ea Implementation of the Datainfrastructure for fetching Data from different DataStores.
Tim Englich <tim.englich@intevation.de>
parents:
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1 package de.intevation.gnv.geobackend.base.query;
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2
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3 import de.intevation.gnv.geobackend.config.Configuration;
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5 import org.apache.log4j.Logger;
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6
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7 /**
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8 * @author <a href="mailto:tim.englich@intevation.de">Tim Englich</a>
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Tim Englich <tim.englich@intevation.de>
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9 *
5a583cff97ea Implementation of the Datainfrastructure for fetching Data from different DataStores.
Tim Englich <tim.englich@intevation.de>
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10 */
5a583cff97ea Implementation of the Datainfrastructure for fetching Data from different DataStores.
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11 public class QueryExecutorFactory {
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13 public static final String QUERY_EXECUTOR_FACTORY = "query.executor.factory";
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15 /**
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16 * the logger, used to log exceptions and additonaly information
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17 */
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18 private static Logger log = Logger.getLogger(QueryExecutorFactory.class);
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19
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21 /**
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22 * The singleton Instance of this Factory.
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23 */
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24 private static QueryExecutorFactory instance = null;
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25
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26 /**
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27 * Basic-Constructor of this Class
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28 */
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29 public QueryExecutorFactory() {
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30 super();
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31 }
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32
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33 /**
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34 * This Method provides an singleton Instance of this Class.
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35 * @return an singleton Instance of this Class
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36 */
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37 public static synchronized QueryExecutorFactory getInstance(){
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38 if (instance == null) {
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1985d5db0feb Implemented a global configuration that should be used to initialize the geobackend.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 887
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39 Configuration config = Configuration.getInstance();
1985d5db0feb Implemented a global configuration that should be used to initialize the geobackend.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 887
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40
1985d5db0feb Implemented a global configuration that should be used to initialize the geobackend.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 887
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41 if (config.isCacheEnabled()) {
1985d5db0feb Implemented a global configuration that should be used to initialize the geobackend.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 887
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42 final QueryExecutorFactory factory =
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Ingo Weinzierl <ingo.weinzierl@intevation.de>
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43 new CachingQueryExecutorFactory();
1985d5db0feb Implemented a global configuration that should be used to initialize the geobackend.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 887
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44 Runtime.getRuntime().addShutdownHook(new Thread() {
1985d5db0feb Implemented a global configuration that should be used to initialize the geobackend.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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45 @Override
1985d5db0feb Implemented a global configuration that should be used to initialize the geobackend.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 887
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46 public void run() {
1985d5db0feb Implemented a global configuration that should be used to initialize the geobackend.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 887
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47 factory.shutdown();
1985d5db0feb Implemented a global configuration that should be used to initialize the geobackend.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 887
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48 }
1985d5db0feb Implemented a global configuration that should be used to initialize the geobackend.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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49 });
1985d5db0feb Implemented a global configuration that should be used to initialize the geobackend.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 887
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50 return instance = factory;
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51 }
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52
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53 instance = new QueryExecutorFactory();
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54 }
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55 return instance;
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56 }
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57
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58 public void shutdown() {
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59 }
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61 /**
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62 * Getting the QueryExecutor
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63 * @return the QueryExecutor
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64 */
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65 public QueryExecutor getQueryExecutor(){
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66 return new DefaultQueryExceutor();
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67 }
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68 }
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