{"id":719,"date":"2024-08-30T23:20:22","date_gmt":"2024-08-30T15:20:22","guid":{"rendered":"https:\/\/www.xudongvp.com\/?p=719"},"modified":"2024-08-30T23:20:24","modified_gmt":"2024-08-30T15:20:24","slug":"dubbo%e8%bf%87%e6%bb%a4%e5%99%a8%e5%bc%80%e5%8f%91%e8%a6%81%e7%82%b9%e4%b8%8e%e9%81%bf%e5%9d%91%e6%8c%87%e5%8d%97","status":"publish","type":"post","link":"https:\/\/www.xudongvp.com\/?p=719","title":{"rendered":"Dubbo\u8fc7\u6ee4\u5668\u5f00\u53d1\u8981\u70b9\u4e0e\u907f\u5751\u6307\u5357"},"content":{"rendered":"\n

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\u5b98\u7f51Filter\u6559\u7a0b\uff1ahttps:\/\/cn.dubbo.apache.org\/zh-cn\/overview\/tasks\/extensibility\/filter\/<\/a><\/p>\n\n\n\n

\u5bfc\u81f4\u5927\u5bb6\u51fa\u73b0\u8bef\u89e3\uff0c\u53ea\u80fd\u5728\u6bd4\u5982provider\u6216\u8005consumer\u7684\u914d\u7f6e\u4e2d\uff0c\u6216\u8005service\u7684\u914d\u7f6e\u4e2d\uff0c\u914d\u7f6e\u4e86\u5177\u4f53\u7684filter\uff0c\u624d\u80fd\u751f\u6548\u3002\u8fd9\u771f\u662f\u4e2a\u5929\u5927\u7684\u8bef\u89e3\u3002\u8981\u662f\u8fd9\u6837\u7684\u8bdd\uff0cdubbo\u81ea\u5df1\u7684\u5185\u7f6e\u7684\u4e00\u5806filter\u600e\u4e48\u4e32\u8fdb\u53bb\u7684\uff1f\u5947\u8ff9\u4e48\uff1f<\/p>\n\n\n\n

\u8fd9\u91cc\u5c31\u8981\u63d0\u5230\u4e00\u4e2a\u6ce8\u89e3\uff1a@Activate\uff0c\u5b98\u65b9\u7684\u4e00\u4e2a\u4f7f\u7528\u4f8b\u5b50\u5982\u4e0b\uff1a<\/p>\n\n\n\n

https:\/\/cn.dubbo.apache.org\/zh-cn\/blog\/2018\/07\/01\/%E7%AC%AC%E4%B8%80%E4%B8%AA-dubbo-filter<\/a><\/p>\n\n\n\n

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\/*<\/span><\/span>\n * Licensed to the Apache Software Foundation (ASF) under one or more<\/span><\/span>\n * contributor license agreements.  See the NOTICE file distributed with<\/span><\/span>\n * this work for additional information regarding copyright ownership.<\/span><\/span>\n * The ASF licenses this file to You under the Apache License, Version 2.0<\/span><\/span>\n * (the "License"); you may not use this file except in compliance with<\/span><\/span>\n * the License.  You may obtain a copy of the License at<\/span><\/span>\n *<\/span><\/span>\n *     http:\/\/www.apache.org\/licenses\/LICENSE-2.0<\/span><\/span>\n *<\/span><\/span>\n * Unless required by applicable law or agreed to in writing, software<\/span><\/span>\n * distributed under the License is distributed on an "AS IS" BASIS,<\/span><\/span>\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<\/span><\/span>\n * See the License for the specific language governing permissions and<\/span><\/span>\n * limitations under the License.<\/span><\/span>\n *\/<\/span><\/span>\npackage<\/span> <\/span>org<\/span>.<\/span>apache<\/span>.<\/span>dubbo<\/span>.<\/span>common<\/span>.<\/span>extension<\/span>;<\/span><\/span>\n<\/span>\nimport<\/span> <\/span>org<\/span>.<\/span>apache<\/span>.<\/span>dubbo<\/span>.<\/span>common<\/span>.<\/span>URL<\/span>;<\/span><\/span>\n<\/span>\nimport<\/span> <\/span>java<\/span>.<\/span>lang<\/span>.<\/span>annotation<\/span>.<\/span>Documented<\/span>;<\/span><\/span>\nimport<\/span> <\/span>java<\/span>.<\/span>lang<\/span>.<\/span>annotation<\/span>.<\/span>ElementType<\/span>;<\/span><\/span>\nimport<\/span> <\/span>java<\/span>.<\/span>lang<\/span>.<\/span>annotation<\/span>.<\/span>Retention<\/span>;<\/span><\/span>\nimport<\/span> <\/span>java<\/span>.<\/span>lang<\/span>.<\/span>annotation<\/span>.<\/span>RetentionPolicy<\/span>;<\/span><\/span>\nimport<\/span> <\/span>java<\/span>.<\/span>lang<\/span>.<\/span>annotation<\/span>.<\/span>Target<\/span>;<\/span><\/span>\n<\/span>\n\/**<\/span><\/span>\n * Activate. This annotation is useful for automatically activate certain extensions with the given criteria,<\/span><\/span>\n * for examples: <code>@Activate<\/code> can be used to load certain <code>Filter<\/code> extension when there are<\/span><\/span>\n * multiple implementations.<\/span><\/span>\n * <ol><\/span><\/span>\n * <li>{<\/span>@link<\/span> <\/span>Activate<\/span>#<\/span>group()<\/span>} specifies group criteria. Framework SPI defines the valid group values.<\/span><\/span>\n * <li>{<\/span>@link<\/span> <\/span>Activate<\/span>#<\/span>value()<\/span>} specifies parameter key in {@link URL} criteria.<\/span><\/span>\n * <\/ol><\/span><\/span>\n * SPI provider can call {<\/span>@link<\/span> <\/span>ExtensionLoader<\/span>#<\/span>getActivateExtension(URL, String, String)<\/span>} to find out all activated<\/span><\/span>\n * extensions with the given criteria.<\/span><\/span>\n *<\/span><\/span>\n * <\/span>@see<\/span> SPI<\/span><\/span>\n * <\/span>@see<\/span> URL<\/span><\/span>\n * <\/span>@see<\/span> ExtensionLoader<\/span><\/span>\n *\/<\/span><\/span>\n@<\/span>Documented<\/span><\/span>\n@<\/span>Retention<\/span>(<\/span>RetentionPolicy<\/span>.<\/span>RUNTIME<\/span>)<\/span><\/span>\n@<\/span>Target<\/span>({<\/span>ElementType<\/span>.<\/span>TYPE<\/span>,<\/span> <\/span>ElementType<\/span>.<\/span>METHOD<\/span>})<\/span><\/span>\npublic<\/span> <\/span>@<\/span>interface<\/span> <\/span>Activate<\/span> <\/span>{<\/span><\/span>\n    <\/span>\/**<\/span><\/span>\n     * Activate the current extension when one of the groups matches. The group passed into<\/span><\/span>\n     * {@link ExtensionLoader#getActivateExtension(URL, String, String)} will be used for matching.<\/span><\/span>\n     *<\/span><\/span>\n     * @return group names to match<\/span><\/span>\n     * @see ExtensionLoader#getActivateExtension(URL, String, String)<\/span><\/span>\n     *\/<\/span><\/span>\n    <\/span>String<\/span>[]<\/span> <\/span>group<\/span>()<\/span> <\/span>default<\/span> <\/span>{}<\/span>;<\/span><\/span>\n<\/span>\n    <\/span>\/**<\/span><\/span>\n     * Activate the current extension when the specified keys appear in the URL's parameters.<\/span><\/span>\n     * <p><\/span><\/span>\n     * For example, given <code>@Activate("cache, validation")<\/code>, the current extension will be return only when<\/span><\/span>\n     * there's either <code>cache<\/code> or <code>validation<\/code> key appeared in the URL's parameters.<\/span><\/span>\n     * <\/p><\/span><\/span>\n     *<\/span><\/span>\n     * @return URL parameter keys<\/span><\/span>\n     * @see ExtensionLoader#getActivateExtension(URL, String)<\/span><\/span>\n     * @see ExtensionLoader#getActivateExtension(URL, String, String)<\/span><\/span>\n     *\/<\/span><\/span>\n    <\/span>String<\/span>[]<\/span> <\/span>value<\/span>()<\/span> <\/span>default<\/span> <\/span>{}<\/span>;<\/span><\/span>\n<\/span>\n    <\/span>\/**<\/span><\/span>\n     * Relative ordering info, optional<\/span><\/span>\n     * Deprecated since 2.7.0<\/span><\/span>\n     *<\/span><\/span>\n     * @return extension list which should be put before the current one<\/span><\/span>\n     *\/<\/span><\/span>\n    <\/span>@<\/span>Deprecated<\/span><\/span>\n    <\/span>String<\/span>[]<\/span> <\/span>before<\/span>()<\/span> <\/span>default<\/span> <\/span>{}<\/span>;<\/span><\/span>\n<\/span>\n    <\/span>\/**<\/span><\/span>\n     * Relative ordering info, optional<\/span><\/span>\n     * Deprecated since 2.7.0<\/span><\/span>\n     *<\/span><\/span>\n     * @return extension list which should be put after the current one<\/span><\/span>\n     *\/<\/span><\/span>\n    <\/span>@<\/span>Deprecated<\/span><\/span>\n    <\/span>String<\/span>[]<\/span> <\/span>after<\/span>()<\/span> <\/span>default<\/span> <\/span>{}<\/span>;<\/span><\/span>\n<\/span>\n    <\/span>\/**<\/span><\/span>\n     * Absolute ordering info, optional<\/span><\/span>\n     *<\/span><\/span>\n     * Ascending order, smaller values will be in the front o the list.<\/span><\/span>\n     *<\/span><\/span>\n     * @return absolute ordering info<\/span><\/span>\n     *\/<\/span><\/span>\n    <\/span>int<\/span> <\/span>order<\/span>()<\/span> <\/span>default<\/span> <\/span>0<\/span>;<\/span><\/span>\n<\/span>\n    <\/span>\/**<\/span><\/span>\n     * Activate loadClass when the current extension when the specified className all match<\/span><\/span>\n     * @return className names to all match<\/span><\/span>\n     *\/<\/span><\/span>\n    <\/span>String<\/span>[]<\/span> <\/span>onClass<\/span>()<\/span> <\/span>default<\/span> <\/span>{}<\/span>;<\/span><\/span>\n}<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
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org.apache.dubbo.common.constants.CommonConstants.CONSUMER<\/p>\n\n\n\n
org.apache.dubbo.common.constants.CommonConstants.PROVIDER<\/p>\n\n\n\n
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public<\/span> <\/span>interface<\/span> <\/span>CommonConstants<\/span> <\/span>{<\/span><\/span>\n<\/span>\n    <\/span>String<\/span> <\/span>DUBBO<\/span> <\/span>=<\/span> <\/span>"<\/span>dubbo<\/span>"<\/span>;<\/span><\/span>\n<\/span>\n    <\/span>String<\/span> <\/span>TRIPLE<\/span> <\/span>=<\/span> <\/span>"<\/span>tri<\/span>"<\/span>;<\/span><\/span>\n<\/span>\n    <\/span>String<\/span> <\/span>PROVIDER<\/span> <\/span>=<\/span> <\/span>"<\/span>provider<\/span>"<\/span>;<\/span><\/span>\n<\/span>\n    <\/span>String<\/span> <\/span>CONSUMER<\/span> <\/span>=<\/span> <\/span>"<\/span>consumer<\/span>"<\/span>;<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
\u5728Filter\u7684\u8fdb\u884c\u5982\u4e0b\u6ce8\u89e3<\/p>\n\n\n\n
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@<\/span>Activate<\/span>(<\/span>group<\/span> <\/span>=<\/span> <\/span>{<\/span>CONSUMER<\/span>,<\/span> PROVIDER<\/span>})<\/span><\/span>\npublic<\/span> <\/span>class<\/span> <\/span>CacheFilter<\/span> <\/span>implements<\/span> <\/span>Filter<\/span> <\/span>{<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
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\u6240\u4ee5\uff0c\u5982\u679c\u4f60\u52a0\u4e86\u8fd9\u4e2a\u6ce8\u89e3\uff0c\u8fd8\u4e0d\u751f\u6548\uff0c\u770b\u770b\u662f\u4e0d\u662f\u81ea\u5df1\u753b\u86c7\u6dfb\u8db3\uff0c\u5199\u4e86\u4e2avalue\u5427\uff1f\u5982\u679c\u4e0d\u4e86\u89e3value\u7684\u7528\u6cd5\uff0c\u4e0d\u8981\u968f\u4fbf\u5199\u3002\u5199\u4e0a\u5c31\u65e0\u6cd5\u6fc0\u6d3b\u3002<\/p>\n\n\n\n
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if<\/span> <\/span>(<\/span>isMatchGroup<\/span>(<\/span>group<\/span>,<\/span> activateGroup<\/span>)<\/span><\/span>\n                        <\/span>&&<\/span> <\/span>!<\/span>namesSet<\/span>.<\/span>contains<\/span>(<\/span>name<\/span>)<\/span><\/span>\n                        <\/span>&&<\/span> <\/span>!<\/span>namesSet<\/span>.<\/span>contains<\/span>(<\/span>REMOVE_VALUE_PREFIX <\/span>+<\/span> name<\/span>)<\/span><\/span>\n                        <\/span>&&<\/span> <\/span>isActive<\/span>(<\/span>cachedActivateValues<\/span>.<\/span>get<\/span>(<\/span>name<\/span>),<\/span> url<\/span>))<\/span> <\/span>{<\/span><\/span>\n<\/span>\n                    <\/span>activateExtensionsMap<\/span>.<\/span>put<\/span>(<\/span>getExtensionClass<\/span>(<\/span>name<\/span>),<\/span> <\/span>getExtension<\/span>(<\/span>name<\/span>))<\/span>;<\/span><\/span>\n                <\/span>}<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
\u53e6\u5916\u63d0\u793aFilter\u5f00\u53d1\u8fc7\u7a0b\u907f\u5751<\/p>\n\n\n\n
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