eu.vital.maps.server.servlets.EventsConsumer.java Source code

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Here is the source code for eu.vital.maps.server.servlets.EventsConsumer.java

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package eu.vital.maps.server.servlets;

/*
 * #%L
 * GWT Maps API V3 - Showcase
 * %%
 * Copyright (C) 2011 - 2016 GWT Maps API V3
 * %%
 * Licensed 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.
 * #L%
 */

import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;

import javax.annotation.PostConstruct;

import kafka.consumer.ConsumerConfig;
import kafka.consumer.ConsumerIterator;
import kafka.consumer.KafkaStream;
import kafka.javaapi.consumer.ConsumerConnector;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.stereotype.Component;

import eu.vital.maps.server.inmemoryqueue.TrafficEventsProducer;

@Component("kafkaEvents")
@Configuration
public class EventsConsumer {

    @Autowired
    private TrafficEventsProducer trafficEventsProducer;

    private ConsumerConnector consumer;
    private String topic;

    public EventsConsumer() {
        consumer = kafka.consumer.Consumer.createJavaConsumerConnector(createConsumerConfig());
        this.topic = "events";
    }

    private static ConsumerConfig createConsumerConfig() {
        Properties props = new Properties();
        props.put("zookeeper.connect", "localhost:2181");
        props.put("group.id", "test");
        props.put("zookeeper.session.timeout.ms", "400");
        props.put("zookeeper.sync.time.ms", "200");
        props.put("auto.commit.interval.ms", "1000");
        return new ConsumerConfig(props);
    }

    @PostConstruct
    public void run() throws InterruptedException {
        Map<String, Integer> topicCountMap = new HashMap<String, Integer>();
        topicCountMap.put(topic, new Integer(1));
        Map<String, List<KafkaStream<byte[], byte[]>>> consumerMap = consumer.createMessageStreams(topicCountMap);
        KafkaStream<byte[], byte[]> stream = consumerMap.get(topic).get(0);
        ConsumerIterator<byte[], byte[]> it = stream.iterator();
        while (it.hasNext()) {
            trafficEventsProducer.produceMyObject(new String(it.next().message()));
        }
        //System.out.println(new String(it.next().message()));
    }

}