/**

  * Copyright 2005-2013 Dozer Project

  *

  * 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.dozer.stats;

 import org.dozer.util.MappingUtils;

 import java.lang.reflect.InvocationHandler;

 import java.lang.reflect.InvocationTargetException;

 import java.lang.reflect.Method;

 /**

  * Internal dynamic proxy used for collecting mapping statisics. Only intended for internal use.

  * 

  * @author tierney.matt

  */

 public class StatisticsInterceptor implements InvocationHandler {

   private final Object delegate;

   private final StatisticsManager statsMgr;

   public StatisticsInterceptor(Object delegate, StatisticsManager statsMgr) {

     this.delegate = delegate;

     this.statsMgr = statsMgr;

   }

   public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {

     long start = System.currentTimeMillis();

     try {

       Object result = method.invoke(delegate, args);

       long stop = System.currentTimeMillis();

       statsMgr.increment(StatisticType.MAPPING_SUCCESS_COUNT);

       statsMgr.increment(StatisticType.MAPPING_TIME, (stop - start));

       return result;

     } catch (InvocationTargetException e) {

       Throwable ex = e.getTargetException();

       statsMgr.increment(StatisticType.MAPPING_FAILURE_COUNT);

       Throwable rootCause = MappingUtils.getRootCause(ex);

       statsMgr.increment(StatisticType.MAPPING_FAILURE_EX_TYPE_COUNT, rootCause.getClass());

       incrementClassMappingFailureTypeStat(args);

       throw ex;

     }

   }

   private void incrementClassMappingFailureTypeStat(Object[] args) {

     // Determine src and dest class name. The combination of src and dest class name will be used for the statistic entry key.

     String srcClassName = null;

     if (args[0] != null) {

       srcClassName = args[0].getClass().getName();

     }

     String destClassName = null;

     if (args[1] != null) {

       if (args[1] instanceof Class) {

         destClassName = ((Class<?>) args[1]).getName();

       } else {

         destClassName = args[1].getClass().getName();

       }

     }

     statsMgr.increment(StatisticType.MAPPING_FAILURE_TYPE_COUNT, srcClassName + "-->" + destClassName);

   }

 }