hadoop NavBlock 源码
haddop NavBlock 代码
文件路径：/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-router/src/main/java/org/apache/hadoop/yarn/server/router/webapp/NavBlock.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.hadoop.yarn.server.router.webapp;
import com.google.inject.Inject;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.yarn.server.router.Router;
import org.apache.hadoop.yarn.server.webapp.WebPageUtils;
import org.apache.hadoop.yarn.webapp.hamlet2.Hamlet;
import java.util.List;
/**
* Navigation block for the Router Web UI.
*/
public class NavBlock extends RouterBlock {
private Router router;
@Inject
public NavBlock(Router router, ViewContext ctx) {
super(router, ctx);
this.router = router;
}
@Override
public void render(Block html) {
Hamlet.UL<Hamlet.DIV<Hamlet>> mainList = html.div("#nav").
h3("Cluster").
ul().
li().a(url(""), "About").__().
li().a(url("federation"), "Federation").__();
List<String> subClusterIds = getActiveSubClusterIds();
Hamlet.UL<Hamlet.LI<Hamlet.UL<Hamlet.DIV<Hamlet>>>> subAppsList1 =
mainList.li().a(url("nodes"), "Nodes").ul().$style("padding:0.3em 1em 0.1em 2em");
// ### nodes info
subAppsList1.li().__();
for (String subClusterId : subClusterIds) {
subAppsList1.li().a(url("nodes", subClusterId), subClusterId).__();
}
subAppsList1.__().__();
// ### applications info
mainList.li().a(url("apps"), "Applications").__();
// ### tools
Hamlet.DIV<Hamlet> sectionBefore = mainList.__();
Configuration conf = new Configuration();
Hamlet.UL<Hamlet.DIV<Hamlet>> tools = WebPageUtils.appendToolSection(sectionBefore, conf);
if (tools == null) {
return;
}
tools.__().__();
}
}
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