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/* 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 org.activiti.engine.impl.interceptor;

import org.activiti.engine.ActivitiException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.transaction.Status;
import javax.transaction.SystemException;
import javax.transaction.TransactionManager;

/**
 * We cannot perform a retry if we are called in an existing transaction. In that case, the transaction will be marked "rollback-only" after the first ActivitiOptimisticLockingException.
 * 

 */
public class JtaRetryInterceptor extends RetryInterceptor {

  private final Logger log = LoggerFactory.getLogger(JtaRetryInterceptor.class);

  protected final TransactionManager transactionManager;

  public JtaRetryInterceptor(TransactionManager transactionManager) {
    this.transactionManager = transactionManager;
  }

  @Override
  public  T execute(CommandConfig config, Command command) {
    if (calledInsideTransaction()) {
      log.trace("Called inside transaction, skipping the retry interceptor.");
      return next.execute(config, command);
    } else {
      return super.execute(config, command);
    }
  }

  protected boolean calledInsideTransaction() {
    try {
      return transactionManager.getStatus() != Status.STATUS_NO_TRANSACTION;
    } catch (SystemException e) {
      throw new ActivitiException("Could not determine the current status of the transaction manager: " + e.getMessage(), e);
    }
  }

}