| /* |
| * 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.chukwa.util; |
| |
| import javax.ws.rs.core.MediaType; |
| |
| import org.apache.log4j.Logger; |
| |
| import com.sun.jersey.api.client.Client; |
| import com.sun.jersey.api.client.ClientHandlerException; |
| import com.sun.jersey.api.client.WebResource; |
| |
| /* This should contain set of helper methods to convert the |
| * response returned from any web servers to required formats |
| * This can be modified to accept different headers based on the |
| * file formats. |
| */ |
| public class RestUtil { |
| |
| private static WebResource webResource; |
| private static Client webClient; |
| private static Logger log = Logger.getLogger(RestUtil.class); |
| |
| public static String getResponseAsString(String URI) { |
| if (URI == null) { |
| throw new IllegalStateException("URI cannot be blank"); |
| } |
| |
| String response = null; |
| webClient = Client.create(); |
| try { |
| webResource = webClient.resource(URI); |
| response = webResource.accept(MediaType.APPLICATION_JSON_TYPE).get( |
| String.class); |
| } catch (ClientHandlerException e) { |
| Throwable t = e.getCause(); |
| if (t instanceof java.net.ConnectException) { |
| log.warn("Connect exception trying to connect to [" + URI |
| + "]. Make sure the service is running"); |
| } else { |
| log.error(ExceptionUtil.getStackTrace(e)); |
| } |
| } finally { |
| if (webClient != null) { |
| webClient.destroy(); |
| } |
| } |
| return response; |
| } |
| |
| } |