beans.MessageImpl.java Source code

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Here is the source code for beans.MessageImpl.java

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/**
 * Copyright 2016 Thomas Feng
 *
 * 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 beans;

import java.util.Arrays;
import java.util.Date;
import java.util.List;
import java.util.Map;
import java.util.Properties;

import org.apache.kafka.clients.producer.KafkaProducer;
import org.apache.kafka.clients.producer.ProducerRecord;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Component;

import com.google.common.collect.Maps;

import controllers.protocols.Message;
import controllers.protocols.RequestHeader;
import controllers.protocols.UserMessage;
import kafka.javaapi.producer.Producer;
import kafka.producer.KeyedMessage;
import kafka.producer.ProducerConfig;
import play.Logger;
import play.Logger.ALogger;
import play.mvc.Controller;
import play.mvc.Http.Request;
import utils.Constants;

/**
 * @author Thomas Feng (huining.feng@gmail.com)
 */
@Component
public class MessageImpl implements Message {

    private static final ALogger LOG = Logger.of(MessageImpl.class);

    private KafkaProducer<String, UserMessage> producer;

    @Autowired(required = false)
    @Qualifier("kafka-example.producer-properties")
    private Properties producerProperties;

    @Override
    public Void send(UserMessage message) {
        if (producer == null) {
            producer = new KafkaProducer<>(producerProperties);
        }

        Request request = Controller.request();
        Map<String, List<String>> query = Maps.transformValues(request.queryString(),
                value -> Arrays.asList(value));
        RequestHeader header = RequestHeader.newBuilder().setRemoteAddress(request.remoteAddress())
                .setHost(request.host()).setMethod(request.method()).setPath(request.path()).setQuery(query)
                .setSecure(request.secure()).setTimestamp(new Date().getTime()).build();
        message.setRequestHeader(header);

        LOG.info("Producing message: " + message);

        try {
            producer.send(new ProducerRecord<>(Constants.TOPIC, message.getSubject(), message));
            return null;
        } catch (Exception e) {
            throw new RuntimeException("Unable to send Kafka event for message: " + message, e);
        }
    }
}