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/*
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* Copyright (c) 2007-2008 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of the License "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:
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*
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*/
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package com.nokia.helium.jpa;
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import org.apache.log4j.Logger;
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import java.util.HashMap;
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import org.apache.tools.ant.BuildException;
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import java.io.IOException;
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/**
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* Utility class to communicate to the database using JPA entity
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* manager.
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*/
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public final class ORMUtil {
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private static Logger log = Logger.getLogger(ORMUtil.class);
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private static final int PERSISTANCE_COUNT_LIMIT = 1000;
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private static final int READ_CACHE_LIMIT = 30000;
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private static HashMap<String, ORMEntityManager> emMap =
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new HashMap<String, ORMEntityManager>();
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private static HashMap<String, Integer> emMapCount =
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new HashMap<String, Integer>();
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private static Object mutexObject = new Object();
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private ORMUtil() {
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}
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/**
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* Initializes the entity manager and begins the transcations.
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* @param urlPath - database path to be connected to.
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*/
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public static synchronized void initializeORM(String urlPath) {
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ORMEntityManager manager = emMap.get(urlPath);
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log.debug("initializeORM: urlpath: " + urlPath);
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if (manager == null) {
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try {
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log.debug("initializing for the first time");
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manager = new ORMEntityManager(urlPath);
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emMap.put(urlPath, manager);
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Integer countObj = new Integer(1);
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emMapCount.put(urlPath, countObj);
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log.debug("initializeORM: manager: " + manager);
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log.debug("initializeORM: manager: " + manager.getEntityManager());
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} catch ( IOException ex ) {
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throw new BuildException("Entity Manager creation failure");
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}
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} else {
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Integer countObj = emMapCount.get(urlPath);
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log.debug("object exists and incrementing the value");
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countObj = new Integer(countObj.intValue() + 1);
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log.debug("object exists count value: " + countObj.intValue());
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emMapCount.put(urlPath, countObj);
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}
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}
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/**
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* Helper Function to return the entity manager.
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* @return entity manager created during initialization.
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*/
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public static synchronized ORMEntityManager getEntityManager(String urlPath) {
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log.debug("getEntityManager: urlpath: " + urlPath);
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ORMEntityManager manager = emMap.get(urlPath);
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if (manager != null) {
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log.debug("getEntityManager: manager: " + manager);
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log.debug("getEntityManager: manager.entityManager: " + manager.getEntityManager());
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return manager;
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} else {
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log.debug("getEntityManager: manager: is null");
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throw new BuildException("ORM entity manager is null");
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}
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}
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/**
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* Finalize the entity manager and release all the objects.
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*/
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public static synchronized void finalizeORM(String urlPath) {
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ORMEntityManager manager = emMap.get(urlPath);
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log.debug("finalizeORM: urlpath: " + urlPath);
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if (manager != null) {
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Integer countObj = emMapCount.get(urlPath);
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if (countObj != null) {
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int count = countObj.intValue();
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count = count - 1;
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if (count > 0) {
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countObj = new Integer(count);
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log.debug("countOBj value: " + countObj.intValue());
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emMapCount.put(urlPath, countObj);
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} else {
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manager.finalizeEntityManager();
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manager = null;
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log.debug("finalizeORM: manager" + manager);
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emMap.remove(urlPath);
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emMapCount.remove(urlPath);
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}
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}
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}
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}
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public static Object getMutexObject() {
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return mutexObject;
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}
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} |