dubbo Filter 源码
dubbo Filter 代码
文件路径：/dubbo-rpc/dubbo-rpc-api/src/main/java/org/apache/dubbo/rpc/Filter.java
/*
* 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.ExtensionScope;
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.
* <pre>
* They way filter work from sequence point of view is
* <b>
* ...code before filter ...
* invoker.invoke(invocation) //filter work in a filter implementation class
* ...code after filter ...
* </b>
* 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.
* </pre>
*
* Starting from 3.0, Filter on consumer side has been refactored. There are two different kinds of Filters working at different stages
* of an RPC request.
* 1. Filter. Works at the instance level, each Filter is bond to one specific Provider instance(invoker).
* 2. ClusterFilter. Newly introduced in 3.0, intercepts request before Loadbalancer picks one specific Filter(Invoker).
*
* Filter Chain in 3.x
*
* -> Filter -> Invoker
*
* Proxy -> ClusterFilter -> ClusterInvoker -> Filter -> Invoker
*
* -> Filter -> Invoker
*
*
* Filter Chain in 2.x
*
* Filter -> Invoker
*
* Proxy -> ClusterInvoker -> Filter -> Invoker
*
* Filter -> Invoker
*
*
* 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(scope = ExtensionScope.MODULE)
public interface Filter extends BaseFilter {
}
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