/* * Copyright 1999-2011 Alibaba Group. * * 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.alibaba.dubbo.rpc; import com.alibaba.dubbo.common.extension.SPI; /** * Filter. (SPI, Singleton, ThreadSafe) * * @author william.liangf */ @SPI public interface Filter { /** * do invoke filter. * * <code> * // before filter * Result result = invoker.invoke(invocation); * // after filter * return result; * </code> * * @see com.alibaba.dubbo.rpc.Invoker#invoke(Invocation) * @param invoker service * @param invocation invocation. * @return invoke result. * @throws RpcException */ Result invoke(Invoker<?> invoker, Invocation invocation) throws RpcException; }