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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.test;

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


/** Base class for the activiti test cases.
 * 
 * The main reason not to use our own test support classes is that we need to 
 * run our test suite with various configurations, e.g. with and without spring,
 * standalone or on a server etc.  Those requirements create some complications 
 * so we think it's best to use a separate base class.  That way it is much easier 
 * for us to maintain our own codebase and at the same time provide stability 
 * on the test support classes that we offer as part of our api (in org.activiti.engine.test).
 * 
 * @author Tom Baeyens
 * @author Joram Barrez
 */
public class PluggableActivitiTestCase extends AbstractActivitiTestCase {
  
  private static Logger pluggableActivitiTestCaseLogger = LoggerFactory.getLogger(PluggableActivitiTestCase.class);
  
  protected static ProcessEngine cachedProcessEngine;

  protected void initializeProcessEngine() {
    if (cachedProcessEngine == null) {
      
      pluggableActivitiTestCaseLogger.info("No cached process engine found for test. Retrieving the default engine.");
      ProcessEngines.destroy(); // Just to be sure we're not getting any previously cached version
      
      cachedProcessEngine = ProcessEngines.getDefaultProcessEngine();
      if (cachedProcessEngine==null) {
        throw new ActivitiException("no default process engine available");
      }
    }
    processEngine = cachedProcessEngine;
  }
}