/**
* 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.webapp.example;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.yarn.webapp.Controller;
import org.apache.hadoop.yarn.webapp.WebApps;
import org.apache.hadoop.yarn.webapp.view.HtmlPage;
/**
* The obligatory example. No xml/jsp/templates/config files! No
* proliferation of strange annotations either :)
*
* <p>3 in 1 example. Check results at
* <br>http://localhost:8888/hello and
* <br>http://localhost:8888/hello/html
* <br>http://localhost:8888/hello/json
*/
@InterfaceAudience.LimitedPrivate({"YARN", "MapReduce"})
public class HelloWorld {
public static class Hello extends Controller {
@Override public void index() { renderText("Hello world!"); }
public void html() { setTitle("Hello world!"); }
public void json() { renderJSON("Hello world!"); }
}
public static class HelloView extends HtmlPage {
@Override protected void render(Page.HTML<_> html) {
html. // produces valid html 4.01 strict
title($("title")).
p("#hello-for-css").
_($("title"))._()._();
}
}
public static void main(String[] args) {
WebApps.$for(new HelloWorld()).at(8888).inDevMode().start().joinThread();
}
}