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'rapiddweller Common' is an open source Java library forked from Databene Commons by Volker Bergmann. It provides extensions to the Java core library by utility classes, abstract concepts and concrete implementations.

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/*
 * Copyright (C) 2004-2015 Volker Bergmann ([email protected]).
 * All rights reserved.
 *
 * 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 com.rapiddweller.common.log;

import com.rapiddweller.common.ArrayFormat;
import com.rapiddweller.common.BeanUtil;
import com.rapiddweller.common.Level;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;

/**
 * Creates a proxy to a class which logs all invocations of parent interface methods.
 * Created at 17.09.2009 10:54:08
 *
 * @author Volker Bergmann
 * @since 0.5.0
 */
public class LoggingProxyFactory {

  private LoggingProxyFactory() {
  }

  /**
   * Create proxy t.
   *
   * @param             the type parameter
   * @param interfaceClass the interface class
   * @param realObject     the real object
   * @return the t
   */
  public static  T createProxy(Class interfaceClass, T realObject) {
    return createProxy(interfaceClass, realObject, Level.debug);
  }

  /**
   * Create proxy t.
   *
   * @param             the type parameter
   * @param interfaceClass the interface class
   * @param realObject     the real object
   * @param level          the level
   * @return the t
   */
  public static  T createProxy(Class interfaceClass, T realObject, Level level) {
    return createProxy(interfaceClass, realObject, level, BeanUtil.getContextClassLoader());
  }

  /**
   * Create proxy t.
   *
   * @param             the type parameter
   * @param interfaceClass the interface class
   * @param realObject     the real object
   * @param level          the level
   * @param classLoader    the class loader
   * @return the t
   */
  @SuppressWarnings("unchecked")
  public static  T createProxy(Class interfaceClass, T realObject, Level level, ClassLoader classLoader) {
    LoggingInvocationHandler handler = new LoggingInvocationHandler(realObject, level);
    return (T) Proxy.newProxyInstance(classLoader, new Class[] {interfaceClass}, handler);
  }

  /**
   * The type Logging invocation handler.
   */
  protected static class LoggingInvocationHandler implements InvocationHandler {

    private final Object realObject;
    private final Logger logger;
    private final Level level;

    /**
     * Instantiates a new Logging invocation handler.
     *
     * @param realObject the real object
     * @param level      the level
     */
    public LoggingInvocationHandler(Object realObject, Level level) {
      this.realObject = realObject;
      this.logger = LogManager.getLogger(realObject.getClass());
      this.level = level;
    }

    @Override
    public Object invoke(Object object, Method method, Object[] args) {
      String message = method.getName() + '(' + ArrayFormat.format(args) + ')';
      switch (level) {
        case ignore:
          break;
        case trace:
          logger.trace(message);
          break;
        case debug:
          logger.debug(message);
          break;
        case info:
          logger.info(message);
          break;
        case warn:
          logger.warn(message);
          break;
        case error:
        case fatal:
          logger.error(message);
          break;
      }
      return BeanUtil.invoke(realObject, method, args);
    }

  }

}