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/*******************************************************************************
 * Copyright 2012 Anteros Tecnologia
 *  
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *  
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *******************************************************************************/
package br.com.anteros.persistence.transaction.impl;

import java.sql.Connection;

import javax.transaction.Status;
import javax.transaction.SystemException;
import javax.transaction.UserTransaction;

import br.com.anteros.core.log.Logger;
import br.com.anteros.core.log.LoggerProvider;
import br.com.anteros.persistence.session.context.SQLPersistenceContext;
import br.com.anteros.persistence.transaction.AbstractTransaction;
import br.com.anteros.persistence.transaction.TransactionSatus;

public class JTATransaction extends AbstractTransaction {

	private static Logger log = LoggerProvider.getInstance().getLogger(JTATransaction.class.getName());

	private UserTransaction userTransaction;
	private boolean newTransaction;

	public JTATransaction(Connection connection, SQLPersistenceContext context, UserTransaction userTransaction) {
		this(connection, context);
	}

	public JTATransaction(Connection connection, SQLPersistenceContext context) {
		super(connection, context);
	}

	@Override
	protected void doBegin() throws Exception {
		newTransaction = userTransaction.getStatus() == Status.STATUS_NO_TRANSACTION;
		if (newTransaction) {
			userTransaction.begin();
			log.debug("Began a new JTA transaction");
		}
	}

	@Override
	protected void doCommit() throws Exception {
		userTransaction.commit();
		log.debug("Committed JTA UserTransaction");
	}

	@Override
	protected void doRollback() throws Exception {
		userTransaction.rollback();
		log.debug("Rolled back JTA UserTransaction");
	}

	@Override
	protected boolean doExtendedActiveCheck() {
		if (status != TransactionSatus.ACTIVE || status == TransactionSatus.FAILED_COMMIT
				|| status == TransactionSatus.COMMITTED) {
			return false;
		}

		final int status;
		try {
			status = userTransaction.getStatus();
		} catch (SystemException se) {
			log.error("Could not determine transaction status", se);
			throw new TransactionException("Could not determine transaction status: ", se);
		}
		if (status == Status.STATUS_UNKNOWN) {
			throw new TransactionException("Could not determine transaction status");
		}
		else {
			return status == Status.STATUS_ACTIVE;
		}
	}

}