content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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.apache.ambari.server.orm;
  
  
  import org.aopalliance.intercept.MethodInterceptor;
  import org.aopalliance.intercept.MethodInvocation;
  
  import com.google.inject.Inject;
  import com.google.inject.persist.jpa.AmbariJpaPersistService;
  
  /**
   * AOP interceptor to provide session borders
   */
  public class AmbariLocalSessionInterceptor implements MethodInterceptor {
  
    @Inject
    private AmbariJpaPersistService emProvider;
  
    private final ThreadLocal<Boolean> didWeStartWork = new ThreadLocal<>();
  
    @Override
    public Object invoke(MethodInvocation invocation) throws Throwable {
      if (!emProvider.isWorking()) {
        emProvider.begin();
        didWeStartWork.set(true);
  
        try {
          return invocation.proceed();
        } finally {
          if (null != didWeStartWork.get()) {
            didWeStartWork.remove();
            emProvider.end();
          }
        }
  
      } else {
        //if session was in progress just proceed without additional checks
        return invocation.proceed();
      }
  
  
  
  
    }
  }
  