/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2011, Red Hat Inc. or third-party contributors as
 * indicated by the @author tags or express copyright attribution
 * statements applied by the authors.  All third-party contributions are
 * distributed under license by Red Hat Inc.
 *
 * This copyrighted material is made available to anyone wishing to use, modify,
 * copy, or redistribute it subject to the terms and conditions of the GNU
 * Lesser General Public License, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution; if not, write to:
 * Free Software Foundation, Inc.
 * 51 Franklin Street, Fifth Floor
 * Boston, MA  02110-1301  USA
 */
package org.hibernate.service.jta.platform.internal;

import org.hibernate.cfg.AvailableSettings;
import org.hibernate.internal.util.config.ConfigurationHelper;
import org.hibernate.service.jndi.spi.JndiService;
import org.hibernate.service.jta.platform.spi.JtaPlatform;
import org.hibernate.service.spi.Configurable;
import org.hibernate.service.ServiceRegistry;
import org.hibernate.service.spi.ServiceRegistryAwareService;
import org.hibernate.service.spi.ServiceRegistryImplementor;

import javax.transaction.Synchronization;
import javax.transaction.SystemException;
import javax.transaction.Transaction;
import javax.transaction.TransactionManager;
import javax.transaction.UserTransaction;
import java.util.Map;

/**
 * @author Steve Ebersole
 */
public abstract class AbstractJtaPlatform
		implements JtaPlatform, Configurable, ServiceRegistryAwareService, TransactionManagerAccess {
	private boolean cacheTransactionManager;
	private boolean cacheUserTransaction;
	private ServiceRegistryImplementor serviceRegistry;

	private final JtaSynchronizationStrategy tmSynchronizationStrategy = new TransactionManagerBasedSynchronizationStrategy( this );

	@Override
	public void injectServices(ServiceRegistryImplementor serviceRegistry) {
		this.serviceRegistry = serviceRegistry;
	}

	protected ServiceRegistry serviceRegistry() {
		return serviceRegistry;
	}

	protected JndiService jndiService() {
		return serviceRegistry().getService( JndiService.class );
	}

	protected abstract TransactionManager locateTransactionManager();
	protected abstract UserTransaction locateUserTransaction();

	public void configure(Map configValues) {
		cacheTransactionManager = ConfigurationHelper.getBoolean( AvailableSettings.JTA_CACHE_TM, configValues, true );
		cacheUserTransaction = ConfigurationHelper.getBoolean( AvailableSettings.JTA_CACHE_UT, configValues, false );
	}

	protected boolean canCacheTransactionManager() {
		return cacheTransactionManager;
	}

	protected boolean canCacheUserTransaction() {
		return cacheUserTransaction;
	}

	private TransactionManager transactionManager;

	@Override
	public TransactionManager retrieveTransactionManager() {
		if ( canCacheTransactionManager() ) {
			if ( transactionManager == null ) {
				transactionManager = locateTransactionManager();
			}
			return transactionManager;
		}
		else {
			return locateTransactionManager();
		}
	}

	@Override
	public TransactionManager getTransactionManager() {
		return retrieveTransactionManager();
	}

	private UserTransaction userTransaction;

	@Override
	public UserTransaction retrieveUserTransaction() {
		if ( canCacheUserTransaction() ) {
			if ( userTransaction == null ) {
				userTransaction = locateUserTransaction();
			}
			return userTransaction;
		}
		return locateUserTransaction();
	}

	@Override
	public Object getTransactionIdentifier(Transaction transaction) {
		// generally we use the transaction itself.
		return transaction;
	}

	protected JtaSynchronizationStrategy getSynchronizationStrategy() {
		return tmSynchronizationStrategy;
	}

	@Override
	public void registerSynchronization(Synchronization synchronization) {
		getSynchronizationStrategy().registerSynchronization( synchronization );
	}

	@Override
	public boolean canRegisterSynchronization() {
		return getSynchronizationStrategy().canRegisterSynchronization();
	}

	@Override
	public int getCurrentStatus() throws SystemException {
		return retrieveTransactionManager().getStatus();
	}
}