com.datatorrent.demos.mrmonitor.MRUtil.java Source code

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Here is the source code for com.datatorrent.demos.mrmonitor.MRUtil.java

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/**
 * 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 com.datatorrent.demos.mrmonitor;

import java.io.IOException;

import org.codehaus.jettison.json.JSONObject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.BasicResponseHandler;
import org.apache.http.impl.client.DefaultHttpClient;

/**
 * <p>
 * Util class.
 * </p>
 *
 * @since 0.3.4
 */
public class MRUtil {

    private static final Logger logger = LoggerFactory.getLogger(MRUtil.class);

    /**
     * This method returns the response content for a given url
     * @param url
     * @return
     */
    public static String getJsonForURL(String url) {
        HttpClient httpclient = new DefaultHttpClient();
        logger.debug(url);
        try {

            HttpGet httpget = new HttpGet(url);

            // Create a response handler
            ResponseHandler<String> responseHandler = new BasicResponseHandler();
            String responseBody;
            try {
                responseBody = httpclient.execute(httpget, responseHandler);

            } catch (ClientProtocolException e) {
                logger.debug(e.getMessage());
                return null;

            } catch (IOException e) {
                logger.debug(e.getMessage());
                return null;
            } catch (Exception e) {
                logger.debug(e.getMessage());
                return null;
            }
            return responseBody.trim();
        } finally {
            httpclient.getConnectionManager().shutdown();
        }
    }

    /**
     * This method returns the JSONObject for a given string
     * @param json
     * @return
     */
    public static JSONObject getJsonObject(String json) {
        try {
            JSONObject jsonObj = new JSONObject(json);
            return jsonObj;
        } catch (Exception e) {
            logger.debug("{}", e.getMessage());
            return null;
        }
    }

}