EtmMethodCallInterceptor.java

/*
 *
 * Copyright (c) void.fm
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this list
 * of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice, this
 * list of conditions and the following disclaimer in the documentation and/or
 * other materials provided with the distribution.
 *
 * Neither the name void.fm nor the names of its contributors may be
 * used to endorse or promote products derived from this software without specific
 * prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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package etm.contrib.aop.aspectj;

import etm.core.monitor.EtmMonitor;
import etm.core.monitor.EtmPoint;
import org.aspectj.lang.ProceedingJoinPoint;

/**
 * Temp commit. Duplicate join point code.
 *
 * @author void.fm
 * @version $Revision$
 * @since 1.2.4
 */
public class EtmMethodCallInterceptor {

  private final EtmMonitor etmMonitor;

  public EtmMethodCallInterceptor(EtmMonitor aEtmMonitor) {
    etmMonitor = aEtmMonitor;
  }

  public Object invoke(ProceedingJoinPoint jp) throws Throwable {

    EtmPoint etmPoint = etmMonitor.createPoint(calculateName(jp));
    try {
      return jp.proceed();
    } catch (Throwable t) {
      alterNamePostException(etmPoint, t);
      throw t;
    } finally {
      etmPoint.collect();
    }

  }

  /**
   * Calculate EtmPoint name based on the method invocation.
   *
   * @param jp The method join point.
   * @return The name of the EtmPoint.
   */
  protected String calculateName(ProceedingJoinPoint jp) {
    Object target = jp.getTarget();
    String name = jp.getSignature().getName();

    return calculateShortName(target.getClass()) + "::" + name;
  }

  /**
   * Alter name in case an exception is caught during processing. Altering the
   * name takes place after executing target method. Ensure that you never cause
   * an exception within this code.
   *
   * @param aEtmPoint The EtmPoint to alter.
   * @param t         The caught throwable t.
   */
  protected void alterNamePostException(EtmPoint aEtmPoint, Throwable t) {
    aEtmPoint.alterName(aEtmPoint.getName() + " [" + calculateShortName(t.getClass()) + "]");
  }


  /**
   * Calculate short name for a given class.
   *
   * @param clazz The class object.
   * @return The short name for the given class.
   */
  protected String calculateShortName(Class clazz) {
    String name = clazz.getName();
    int beginIndex = name.lastIndexOf('.');
    if (beginIndex > 0) {
      return name.substring(beginIndex + 1);
    } else {
      return name;
    }
  }
}