/*
    * 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.commons.monitoring.jta;
  
  import javax.annotation.Resource;
  import javax.interceptor.AroundInvoke;
  import javax.interceptor.AroundTimeout;
  import javax.interceptor.Interceptor;
  import javax.interceptor.InvocationContext;
  import javax.transaction.Status;
  import javax.transaction.Synchronization;
  import javax.transaction.TransactionSynchronizationRegistry;
  
  @Interceptor
  @JTAMonitored
  public class JTAInterceptor {
      private static final String RESOURCE_KEY = JTAInterceptor.class.getName();
  
      @Resource
      private TransactionSynchronizationRegistry transactionSynchronizationRegistry;
  
      @AroundInvoke
      @AroundTimeout
      public Object jta(final InvocationContext invocationContext) throws Throwable {
          if (transactionSynchronizationRegistry.getResource(RESOURCE_KEY) == null) {
              JTAGauges.ACTIVE.incrementAndGet();
              transactionSynchronizationRegistry.putResource(RESOURCE_KEY, Boolean.TRUE);
              transactionSynchronizationRegistry.registerInterposedSynchronization(new JTACounterSynchronization());
          }
          return invocationContext.proceed();
      }
  
      private static class JTACounterSynchronization implements Synchronization {
          @Override
          public void beforeCompletion() {
              // no-op
          }
  
          @Override
          public void afterCompletion(final int status) {
              if (status == Status.STATUS_COMMITTED) {
                  JTAGauges.COMMITTED.incrementAndGet();
              } else if (status == Status.STATUS_ROLLEDBACK) {
                  JTAGauges.ROLLBACKED.incrementAndGet();
              }
              JTAGauges.ACTIVE.decrementAndGet();
          }
      }
  }