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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.dubbo.rpc;
import org.apache.dubbo.common.extension.SPI;
/**
* Extension for intercepting the invocation for both service provider and consumer, furthermore, most of
* functions in dubbo are implemented base on the same mechanism. Since every time when remote method is
* invoked, the filter extensions will be executed too, the corresponding penalty should be considered before
* more filters are added.
*
* They way filter work from sequence point of view is
*
* ...code before filter ...
* invoker.invoke(invocation) //filter work in a filter implementation class
* ...code after filter ...
*
* Caching is implemented in dubbo using filter approach. If cache is configured for invocation then before
* remote call configured caching type's (e.g. Thread Local, JCache etc) implementation invoke method gets called.
*
* Filter. (SPI, Singleton, ThreadSafe)
*
* @see org.apache.dubbo.rpc.filter.GenericFilter
* @see org.apache.dubbo.rpc.filter.EchoFilter
* @see org.apache.dubbo.rpc.filter.TokenFilter
* @see org.apache.dubbo.rpc.filter.TpsLimitFilter
*/
@SPI
public interface Filter {
/**
* Make sure call invoker.invoke() in your implementation.
*/
Result invoke(Invoker invoker, Invocation invocation) throws RpcException;
interface Listener {
void onResponse(Result appResponse, Invoker invoker, Invocation invocation);
void onError(Throwable t, Invoker invoker, Invocation invocation);
}
}