1 

     2 /*

     3  * Copyright (c) 2007-2008 Nokia Corporation and/or its subsidiary(-ies).

     4  * All rights reserved.

     5  * This component and the accompanying materials are made available

     6  * under the terms of the License "Eclipse Public License v1.0"

     7  * which accompanies this distribution, and is available

     8  * at the URL "http://www.eclipse.org/legal/epl-v10.html".

     9  *

    10  * Initial Contributors:

    11  * Nokia Corporation - initial contribution.

    12  *

    13  * Contributors:

    14  *

    15  * Description:  

    16  *

    17  */

    18 

    19 package com.nokia.helium.jpa;

    20 

    21 import org.apache.log4j.Logger;

    22 import java.util.HashMap;

    23 import org.apache.tools.ant.BuildException;

    24 import java.io.IOException;

    25 

    26 /**

    27  * Utility class to communicate to the database using JPA entity

    28  * manager.

    29  */

    30 public final class ORMUtil {

    31 

    32     private static Logger log = Logger.getLogger(ORMUtil.class);

    33     

    34     private static final int PERSISTANCE_COUNT_LIMIT = 1000;

    35 

    36     private static final int READ_CACHE_LIMIT = 30000;

    37 

    38     private static HashMap<String, ORMEntityManager> emMap = 

    39         new HashMap<String, ORMEntityManager>();

    40 

    41     private ORMUtil() {

    42     }

    43     

    44     /**

    45      * Initializes the entity manager and begins the transcations.

    46      * @param urlPath - database path to be connected to.

    47      */

    48     public static synchronized void initializeORM(String urlPath) {

    49         ORMEntityManager manager = emMap.get(urlPath);

    50         log.debug("initializeORM: urlpath: " + urlPath);

    51         if (manager == null) {

    52             try {

    53                 manager = new ORMEntityManager(urlPath);

    54                 emMap.put(urlPath, manager);

    55                 log.debug("initializeORM: manager: " + manager);

    56                 log.debug("initializeORM: manager: " + manager.getEntityManager());

    57             } catch ( IOException ex ) {

    58                 throw new BuildException("Entity Manager creation failure");

    59             }

    60         }

    61     }

    62 

    63     /**

    64      * Helper Function to return the entity manager.

    65      * @return entity manager created during initialization.

    66      */

    67     public static ORMEntityManager getEntityManager(String urlPath) {

    68         log.debug("getEntityManager: urlpath: " + urlPath);

    69         ORMEntityManager manager = emMap.get(urlPath);

    70         if (manager != null) {

    71             log.debug("getEntityManager: manager: " + manager);

    72             log.debug("getEntityManager: manager.entityManager: " + manager.getEntityManager());

    73             return manager;

    74         } else {

    75             log.debug("getEntityManager: manager: is null");

    76             throw new BuildException("ORM entity manager is null");

    77         }

    78     }

    79     

    80     /**

    81      * Finalize the entity manager and release all the objects.

    82      */

    83     public static void finalizeORM(String urlPath) {

    84         ORMEntityManager manager = emMap.get(urlPath);

    85         log.debug("finalizeORM: urlpath: " + urlPath);

    86         if (manager != null) {

    87             manager.finalizeEntityManager();

    88             manager = null;

    89             log.debug("finalizeORM: manager" + manager);

    90             emMap.remove(urlPath);

    91         }

    92     }

    93 }