/*
    * 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.aspectj;
  
  import org.apache.commons.monitoring.aop.AbstractPerformanceInterceptor;
  import org.aspectj.lang.ProceedingJoinPoint;
  import org.aspectj.lang.Signature;
  import org.aspectj.lang.annotation.Around;
  import org.aspectj.lang.annotation.Aspect;
  import org.aspectj.lang.annotation.Pointcut;
  
  import java.lang.reflect.Method;
  
  @Aspect
  public abstract class CommonsMonitoringAspect extends AbstractPerformanceInterceptor<ProceedingJoinPoint> {
      @Pointcut
      protected abstract void pointcut();
  
      @Around("pointcut()")
      public Object monitor(final ProceedingJoinPoint pjp) throws Throwable {
          return doInvoke(pjp);
      }
  
      @Override
      protected Object proceed(final ProceedingJoinPoint invocation) throws Throwable {
          return invocation.proceed();
      }
  
      @Override
      protected String getCounterName(final ProceedingJoinPoint invocation) {
          final String monitorName = getCounterName(invocation.getTarget(), findMethod(invocation.getSignature()));
          if (monitorName != null) {
              return monitorName;
          }
          return invocation.getSignature().toLongString();
      }
  
      private static Method findMethod(final Signature signature) {
          if ("org.aspectj.runtime.reflect.MethodSignatureImpl".equals(signature.getClass().getName())) {
              try {
                  final Method mtd = signature.getClass().getMethod("getMethod");
                  if (!mtd.isAccessible()) {
                      mtd.setAccessible(true);
                  }
                  return Method.class.cast(mtd.invoke(signature));
              } catch (final Exception e) {
                  // no-op
              }
          }
          return null;
      }
  }