/*
    * Copyright 2006-2011 The Kuali Foundation
    *
    * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php
    *
   * 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.kuali.rice.ksb.messaging.bam;
  
  import java.lang.reflect.InvocationTargetException;
  import java.lang.reflect.Method;
  import java.lang.reflect.Proxy;
  
  import org.kuali.rice.core.api.config.property.Config;
  import org.kuali.rice.core.api.config.property.ConfigContext;
  import org.kuali.rice.core.impl.resourceloader.ContextClassLoaderProxy;
  import org.kuali.rice.core.util.reflect.BaseTargetedInvocationHandler;
  import org.kuali.rice.ksb.api.bus.ServiceDefinition;
  import org.kuali.rice.ksb.messaging.bam.service.BAMService;
  import org.kuali.rice.ksb.service.KSBServiceLocator;
  
  
  /**
   * A service-side proxy for that records an entry in the BAM for invocations
   * on the proxied service endpoint.
   *
   * @see BAMService
   *
   * @author Kuali Rice Team (rice.collab@kuali.org)
   */
  
  public class BAMServerProxy extends BaseTargetedInvocationHandler {
  
  	private ServiceDefinition serviceDefinition;
  	
  	private BAMServerProxy(Object target, ServiceDefinition serviceDefinition) {
  		super(target);
  		this.serviceDefinition = serviceDefinition;
  	}
  	
  	public static boolean isBamSupported() {
  		return KSBServiceLocator.getBAMService() != null && Boolean.valueOf(ConfigContext.getCurrentContextConfig().getProperty(Config.BAM_ENABLED));
  	}
  	
  	public static Object wrap(Object target, ServiceDefinition serviceDefinition) {
  		if (!isBamSupported()) {
  			return target;
  		}
  		return Proxy.newProxyInstance(target.getClass().getClassLoader(), ContextClassLoaderProxy.getInterfacesToProxy(target), new BAMServerProxy(target, serviceDefinition));
  	}
  	
  	protected Object invokeInternal(Object proxiedObject, Method method, Object[] arguments) throws Throwable {
  		BAMTargetEntry bamTargetEntry = KSBServiceLocator.getBAMService().recordServerInvocation(getTarget(), this.serviceDefinition, method, arguments);
  		try {
  			return method.invoke(getTarget(), arguments);	
  		} catch (Throwable throwable) {
  			if (throwable instanceof InvocationTargetException) {
  				throwable = throwable.getCause();
  			}
  			KSBServiceLocator.getBAMService().recordServerInvocationError(throwable, bamTargetEntry);
  			throw throwable;
  		}
  	}
  }