/**
* 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.applicationhistoryservice.webapp;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.commons.logging.impl.Log4JLogger;
import org.apache.hadoop.yarn.api.records.YarnApplicationState;
import org.apache.hadoop.yarn.util.Log4jWarningErrorMetricsAppender;
import org.apache.hadoop.yarn.webapp.hamlet.Hamlet;
import org.apache.hadoop.yarn.webapp.view.HtmlBlock;
public class NavBlock extends HtmlBlock {
@Override
public void render(Block html) {
boolean addErrorsAndWarningsLink = false;
Log log = LogFactory.getLog(NavBlock.class);
if (log instanceof Log4JLogger) {
Log4jWarningErrorMetricsAppender appender =
Log4jWarningErrorMetricsAppender.findAppender();
if (appender != null) {
addErrorsAndWarningsLink = true;
}
}
Hamlet.DIV<Hamlet> nav = html.
div("#nav").
h3("Application History").
ul().
li().a(url("about"), "About").
_().
li().a(url("apps"), "Applications").
ul().
li().a(url("apps",
YarnApplicationState.FINISHED.toString()),
YarnApplicationState.FINISHED.toString()).
_().
li().a(url("apps",
YarnApplicationState.FAILED.toString()),
YarnApplicationState.FAILED.toString()).
_().
li().a(url("apps",
YarnApplicationState.KILLED.toString()),
YarnApplicationState.KILLED.toString()).
_().
_().
_().
_();
Hamlet.UL<Hamlet.DIV<Hamlet>> tools = nav.h3("Tools").ul();
tools.li().a("/conf", "Configuration")._()
.li().a("/logs", "Local logs")._()
.li().a("/stacks", "Server stacks")._()
.li().a("/jmx?qry=Hadoop:*", "Server metrics")._();
if (addErrorsAndWarningsLink) {
tools.li().a(url("errors-and-warnings"), "Errors/Warnings")._();
}
tools._()._();
}
}