org.apache.hoya.yarn.appmaster.web.view.ClusterSpecificationBlock.java Source code

Introduction

Here is the source code for org.apache.hoya.yarn.appmaster.web.view.ClusterSpecificationBlock.java

Source

/*
 * 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.hoya.yarn.appmaster.web.view;

import com.google.inject.Inject;
import org.apache.hadoop.yarn.webapp.hamlet.Hamlet;
import org.apache.hadoop.yarn.webapp.view.HtmlBlock;
import org.apache.hoya.yarn.appmaster.state.StateAccessForProviders;
import org.apache.hoya.yarn.appmaster.web.WebAppApi;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * 
 */
public class ClusterSpecificationBlock extends HtmlBlock {
    private static final Logger log = LoggerFactory.getLogger(ClusterSpecificationBlock.class);

    private StateAccessForProviders appState;

    @Inject
    public ClusterSpecificationBlock(WebAppApi hoya) {
        this.appState = hoya.getAppState();
    }

    @Override
    protected void render(Block html) {
        doRender(html);
    }

    // An extra method to make testing easier since you can't make an instance of Block
    protected void doRender(Hamlet html) {
        html.div("cluster_json").h2("JSON Cluster Specification").pre()._(getJson())._()._();
    }

    /**
     * Get the JSON, catching any exceptions and returning error text instead
     * @return
     */
    private String getJson() {
        return appState.getClusterStatus().toString();
    }

}