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xujingfeng
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Dec 26, 2018
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25 changes: 25 additions & 0 deletions
25
dubbo-cluster/src/main/java/com/alibaba/dubbo/rpc/cluster/router/AbstractRouter.java
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package com.alibaba.dubbo.rpc.cluster.router; | ||
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import com.alibaba.dubbo.common.URL; | ||
import com.alibaba.dubbo.rpc.cluster.Router; | ||
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public abstract class AbstractRouter implements Router { | ||
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protected int priority; | ||
protected URL url; | ||
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@Override | ||
public URL getUrl() { | ||
return url; | ||
} | ||
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@Override | ||
public int getPriority() { | ||
return priority; | ||
} | ||
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@Override | ||
public int compareTo(Router o) { | ||
return (this.getPriority() >= o.getPriority()) ? 1 : -1; | ||
} | ||
} |
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89 changes: 89 additions & 0 deletions
89
dubbo-cluster/src/main/java/com/alibaba/dubbo/rpc/cluster/router/tag/TagRouter.java
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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 com.alibaba.dubbo.rpc.cluster.router.tag; | ||
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import com.alibaba.dubbo.common.Constants; | ||
import com.alibaba.dubbo.common.URL; | ||
import com.alibaba.dubbo.common.logger.Logger; | ||
import com.alibaba.dubbo.common.logger.LoggerFactory; | ||
import com.alibaba.dubbo.common.utils.StringUtils; | ||
import com.alibaba.dubbo.rpc.Invocation; | ||
import com.alibaba.dubbo.rpc.Invoker; | ||
import com.alibaba.dubbo.rpc.RpcContext; | ||
import com.alibaba.dubbo.rpc.RpcException; | ||
import com.alibaba.dubbo.rpc.cluster.router.AbstractRouter; | ||
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import java.util.ArrayList; | ||
import java.util.List; | ||
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/** | ||
* TagRouter | ||
*/ | ||
public class TagRouter extends AbstractRouter { | ||
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private static final Logger logger = LoggerFactory.getLogger(TagRouter.class); | ||
private static final int DEFAULT_PRIORITY = 100; | ||
private static final URL ROUTER_URL = new URL("tag", Constants.ANYHOST_VALUE, 0, Constants.ANY_VALUE).addParameters(Constants.RUNTIME_KEY, "true"); | ||
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public TagRouter(URL url) { | ||
this.url = url; | ||
this.priority = url.getParameter(Constants.PRIORITY_KEY, DEFAULT_PRIORITY); | ||
} | ||
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public TagRouter() { | ||
this.url = ROUTER_URL; | ||
this.priority = url.getParameter(Constants.PRIORITY_KEY, DEFAULT_PRIORITY); | ||
} | ||
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@Override | ||
public URL getUrl() { | ||
return url; | ||
} | ||
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@Override | ||
public <T> List<Invoker<T>> route(List<Invoker<T>> invokers, URL url, Invocation invocation) throws RpcException { | ||
// filter | ||
List<Invoker<T>> result = new ArrayList<Invoker<T>>(); | ||
try { | ||
// Dynamic param | ||
String tag = RpcContext.getContext().getAttachment(Constants.REQUEST_TAG_KEY); | ||
// Tag request | ||
if (!StringUtils.isEmpty(tag)) { | ||
// Select tag invokers first | ||
for (Invoker<T> invoker : invokers) { | ||
if (tag.equals(invoker.getUrl().getParameter(Constants.TAG_KEY))) { | ||
result.add(invoker); | ||
} | ||
} | ||
} | ||
// If Constants.REQUEST_TAG_KEY unspecified or no invoker be selected, downgrade to normal invokers | ||
if (result.isEmpty()) { | ||
for (Invoker<T> invoker : invokers) { | ||
if (StringUtils.isEmpty(invoker.getUrl().getParameter(Constants.TAG_KEY))) { | ||
result.add(invoker); | ||
} | ||
} | ||
} | ||
return result; | ||
} catch (Exception e) { | ||
logger.error("Route by tag error,return all invokers.", e); | ||
} | ||
// Downgrade to all invokers | ||
return invokers; | ||
} | ||
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} |
31 changes: 31 additions & 0 deletions
31
dubbo-cluster/src/main/java/com/alibaba/dubbo/rpc/cluster/router/tag/TagRouterFactory.java
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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 com.alibaba.dubbo.rpc.cluster.router.tag; | ||
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import com.alibaba.dubbo.common.URL; | ||
import com.alibaba.dubbo.rpc.cluster.Router; | ||
import com.alibaba.dubbo.rpc.cluster.RouterFactory; | ||
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public class TagRouterFactory implements RouterFactory { | ||
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public static final String NAME = "tag"; | ||
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@Override | ||
public Router getRouter(URL url) { | ||
return new TagRouter(url); | ||
} | ||
} |
3 changes: 2 additions & 1 deletion
3
...er/src/main/resources/META-INF/dubbo/internal/com.alibaba.dubbo.rpc.cluster.RouterFactory
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@@ -1,3 +1,4 @@ | ||
file=com.alibaba.dubbo.rpc.cluster.router.file.FileRouterFactory | ||
script=com.alibaba.dubbo.rpc.cluster.router.script.ScriptRouterFactory | ||
condition=com.alibaba.dubbo.rpc.cluster.router.condition.ConditionRouterFactory | ||
condition=com.alibaba.dubbo.rpc.cluster.router.condition.ConditionRouterFactory | ||
tag=com.alibaba.dubbo.rpc.cluster.router.tag.TagRouterFactory |
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