/*
 * JSON-RPC-Java - a JSON-RPC to Java Bridge with dynamic invocation
 *
 * $Id: InvocationCallback.java,v 1.3.2.3 2006/03/06 12:39:21 mclark Exp $
 *
 * Copyright Metaparadigm Pte. Ltd. 2004.
 * Michael Clark <michael@metaparadigm.com>
 *
 * 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.metaparadigm.jsonrpc;

import java.io.Serializable;
import java.lang.reflect.Method;

/**
 * Interface to be implemented by objects registered for invocation callbacks
 * with the JSONRPCBridge.
 */

public interface InvocationCallback extends Serializable {

	/**
	 * Callback before invocation of an RPC method.
	 * 
	 * @param context
	 *            The transport context (the HttpServletRequest object in the
	 *            case of the HTTP transport).
	 * @param instance
	 *            The object instance or null if it is a static method.
	 * @param method
	 *            Method that failed the invocation.
	 * @param arguments
	 *            The arguments passed to the method
	 */
	public void preInvoke(Object context, Object instance, Method method, Object arguments[]) throws Exception;

	/**
	 * Callback after invocation of an RPC method.
	 * 
	 * @param context
	 *            The transport context (the HttpServletRequest object in the
	 *            case of the HTTP transport).
	 * @param instance
	 *            The object instance or null if it is a static method.
	 * @param method
	 *            Method that failed the invocation.
	 * @param result
	 *            The returned result from the method
	 */
	public void postInvoke(Object context, Object instance, Method method, Object result) throws Exception;

}
