/* 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.flowable.dmn.spring;

import org.flowable.dmn.engine.DmnEngine;
import org.flowable.dmn.engine.DmnEngineConfiguration;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.DisposableBean;
import org.springframework.beans.factory.FactoryBean;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;

/**
 * @author Dave Syer
 * @author Tijs Rademakers
 * @author Joram Barrez
 * @author Josh Long
 */
public class DmnEngineFactoryBean implements FactoryBean<DmnEngine>, DisposableBean, ApplicationContextAware {

  protected DmnEngineConfiguration dmnEngineConfiguration;

  protected ApplicationContext applicationContext;
  protected DmnEngine dmnEngine;

  public void destroy() throws Exception {
    if (dmnEngine != null) {
      dmnEngine.close();
    }
  }

  public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
    this.applicationContext = applicationContext;
  }

  public DmnEngine getObject() throws Exception {
    configureExternallyManagedTransactions();

    this.dmnEngine = dmnEngineConfiguration.buildDmnEngine();
    return this.dmnEngine;
  }

  protected void configureExternallyManagedTransactions() {
    if (dmnEngineConfiguration instanceof SpringDmnEngineConfiguration) { // remark: any config can be injected, so we cannot have SpringConfiguration as member
      SpringDmnEngineConfiguration engineConfiguration = (SpringDmnEngineConfiguration) dmnEngineConfiguration;
      if (engineConfiguration.getTransactionManager() != null) {
        dmnEngineConfiguration.setTransactionsExternallyManaged(true);
      }
    }
  }

  public Class<DmnEngine> getObjectType() {
    return DmnEngine.class;
  }

  public boolean isSingleton() {
    return true;
  }

  public DmnEngineConfiguration getDmnEngineConfiguration() {
    return dmnEngineConfiguration;
  }

  public void setDmnEngineConfiguration(DmnEngineConfiguration dmnEngineConfiguration) {
    this.dmnEngineConfiguration = dmnEngineConfiguration;
  }
}
