/**
* 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.util;
import com.sun.jersey.api.client.Client;
import com.sun.jersey.api.client.ClientHandlerException;
import com.sun.jersey.api.client.ClientResponse;
import com.sun.jersey.api.client.UniformInterfaceException;
import com.sun.jersey.api.client.WebResource;
import javax.ws.rs.core.MediaType;
import org.apache.hadoop.conf.Configuration;
import org.codehaus.jettison.json.JSONObject;
/**
* This class contains several utility function which could be used to generate
* Restful calls to RM/NM/AHS.
*
*/
public final class YarnWebServiceUtils {
private YarnWebServiceUtils() {}
/**
* Utility function to get NodeInfo by calling RM WebService.
* @param conf the configuration
* @param nodeId the nodeId
* @return a JSONObject which contains the NodeInfo
* @throws ClientHandlerException if there is an error
* processing the response.
* @throws UniformInterfaceException if the response status
* is 204 (No Content).
*/
public static JSONObject getNodeInfoFromRMWebService(Configuration conf,
String nodeId) throws ClientHandlerException,
UniformInterfaceException {
Client webServiceClient = Client.create();
String webAppAddress = WebAppUtils.getRMWebAppURLWithScheme(conf);
WebResource webResource = webServiceClient.resource(webAppAddress);
ClientResponse response = webResource.path("ws").path("v1")
.path("cluster").path("nodes")
.path(nodeId).accept(MediaType.APPLICATION_JSON)
.get(ClientResponse.class);
return response.getEntity(JSONObject.class);
}
}