Mercurial > lada > lada-server

annotate src/main/java/de/intevation/lada/util/data/EntityManagerProducer.java @ 711:3ec358698b4d

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Code style and documentation.
author Raimund Renkert <raimund.renkert@intevation.de>
date Wed, 22 Jul 2015 16:03:03 +0200
parents f0ad10e0e1b1
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rev   line source
438
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1 /* Copyright (C) 2013 by Bundesamt fuer Strahlenschutz
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2 * Software engineering by Intevation GmbH
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3 *
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4 * This file is Free Software under the GNU GPL (v>=3)
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5 * and comes with ABSOLUTELY NO WARRANTY! Check out
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6 * the documentation coming with IMIS-Labordaten-Application for details.
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7 */
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8 package de.intevation.lada.util.data;
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9
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10 import javax.annotation.Resource;
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11 import javax.ejb.LocalBean;
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12 import javax.ejb.SessionContext;
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13 import javax.ejb.Stateless;
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14 import javax.persistence.EntityManager;
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15 import javax.validation.UnexpectedTypeException;
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16
711
3ec358698b4d Code style and documentation.
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17 /**
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18 * Factory class used to get entitymanager for a specific persistence unit.
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19 *
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20 * @author <a href="mailto:rrenkert@intevation.de">Raimund Renkert</a>
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21 */
438
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22 @Stateless
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23 @LocalBean
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24 public class EntityManagerProducer {
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25
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26 @Resource
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27 private SessionContext ctx;
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28
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29 private String jndiPath = "java:app/entitymanager/";
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30
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31 /**
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32 * Constructor for multi-tenancy entity manager delegate.
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33 * Default jndi search path is 'java:app/entitymanager'.
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34 */
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35 public EntityManagerProducer() {
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36 }
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37
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38 /**
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39 * Constructor for multi-tenancy entity manager delegate.
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40 *
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41 * @param jndiEnv The jndi path to search for datasources.
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42 * Defaults to 'java:app/entitymanager'.
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43 */
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44 public EntityManagerProducer(String jndiPath) {
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45 this.jndiPath = jndiPath;
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46 }
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47
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48 /**
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49 * Create an entity manager for a datasource.
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50 *
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51 * @throws UnexpectedTypeException
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52 * @param dataSourceName The jndi name of the datasource.
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53 * @return The entity manager for the datasource.
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54 */
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55 public EntityManager entityManager(String dataSourceName) {
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56
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57 EntityManager entityManager =
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58 (EntityManager) this.ctx.lookup(this.jndiPath + dataSourceName);
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59
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60 if (entityManager == null) {
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61 throw new UnexpectedTypeException("Unknown data source name '" +
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62 dataSourceName + "'.");
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63 }
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64
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65 return entityManager;
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66
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67 }
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68 }
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