OgmJtaPlatformInitiator.java example

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hibernate-ogm-master
/*
 * Hibernate OGM, Domain model persistence for NoSQL datastores
 *
 * License: GNU Lesser General Public License (LGPL), version 2.1 or later
 * See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
 */
package org.hibernate.ogm.transaction.impl;

import java.util.Map;

import org.hibernate.boot.registry.StandardServiceInitiator;
import org.hibernate.boot.registry.classloading.spi.ClassLoaderService;
import org.hibernate.boot.registry.classloading.spi.ClassLoadingException;
import org.hibernate.cfg.AvailableSettings;
import org.hibernate.engine.transaction.jta.platform.internal.JBossStandAloneJtaPlatform;
import org.hibernate.engine.transaction.jta.platform.internal.JtaPlatformInitiator;
import org.hibernate.engine.transaction.jta.platform.internal.NoJtaPlatform;
import org.hibernate.engine.transaction.jta.platform.spi.JtaPlatform;
import org.hibernate.ogm.util.impl.Log;
import org.hibernate.ogm.util.impl.LoggerFactory;
import org.hibernate.service.spi.ServiceRegistryImplementor;

/**
 * @author Emmanuel Bernard <emmanuel@hibernate.org>
 */
public class OgmJtaPlatformInitiator implements StandardServiceInitiator<JtaPlatform> {
	public static final OgmJtaPlatformInitiator INSTANCE = new OgmJtaPlatformInitiator();
	public static final String JBOSS_TM_CLASS_NAME = "com.arjuna.ats.jta.TransactionManager";

	private static final Log log = LoggerFactory.make();

	@Override
	public Class<JtaPlatform> getServiceInitiated() {
		return JtaPlatform.class;
	}

	@Override
	public JtaPlatform initiateService(Map configurationValues, ServiceRegistryImplementor registry) {
		if ( hasExplicitPlatform( configurationValues ) ) {
			return JtaPlatformInitiator.INSTANCE.initiateService( configurationValues, registry );
		}

		// if no platform is set and JBoss transaction manager is available use that one
		if ( jbossTransactionManagerAvailable( registry.getService( ClassLoaderService.class ) ) ) {
			log.jbossTransactionManagerDetected();
			return new JBossStandAloneJtaPlatform();
		}
		else {
			log.noJtaPlatformDetected();
			return new NoJtaPlatform();
		}
	}

	private boolean hasExplicitPlatform(Map configVales) {
		return configVales.containsKey( AvailableSettings.JTA_PLATFORM );
	}

	private boolean jbossTransactionManagerAvailable(ClassLoaderService classLoaderService) {
		try {
			classLoaderService.classForName( JBOSS_TM_CLASS_NAME );
			return true;
		}
		catch ( ClassLoadingException e ) {
			return false;
		}
	}
}