com.eduonix.kafka.ParseTwitterStreamTask.java Source code

Introduction

Here is the source code for com.eduonix.kafka.ParseTwitterStreamTask.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 com.eduonix.kafka;

import org.apache.samza.system.IncomingMessageEnvelope;
import org.apache.samza.system.OutgoingMessageEnvelope;
import org.apache.samza.system.SystemStream;
import org.apache.samza.task.MessageCollector;
import org.apache.samza.task.StreamTask;
import org.apache.samza.task.TaskCoordinator;

import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;

public class ParseTwitterStreamTask implements StreamTask {

    public void process(IncomingMessageEnvelope envelope, MessageCollector collector, TaskCoordinator coordinator)
            throws Exception {

        String msg = ((String) envelope.getMessage());

        try {
            JSONParser parser = new JSONParser();
            Object obj = parser.parse(msg);
            JSONObject jsonObj = (JSONObject) obj;
            String text = (String) jsonObj.get("text");
            if (text == null || text.trim().isEmpty()) {
                text = "found text == null ||text.trim().isEmpty ";
            }

            collector.send(new OutgoingMessageEnvelope(new SystemStream("kafka", "tweets-parsed"), text));
        } catch (ParseException pe) {
        }

    }
}