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/**
 * Copyright 2016 Zaradai
 * 
 * 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.
 */
package com.zaradai.gluon.client;

import com.google.common.eventbus.EventBus;
import com.zaradai.gluon.codecs.FstCodec;
import com.zaradai.gluon.kafka.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import static com.google.common.base.Preconditions.checkNotNull;

public class KafkaClient extends BaseClient {
    private static final Logger LOG = LoggerFactory.getLogger(KafkaClient.class);

    static final String CLIENT_BUS_ID = "client";
    static final String CLIENT_GROUP = "Client-Group";

    private final KafkaClientEventAdaptor eventAdaptor;

    public KafkaClient(KafkaConfig config) {
        this(config, new DefaultProducerFactory(), new DefaultConsumerFactory());
    }

    public KafkaClient(KafkaConfig config, ProducerFactory producerFactory, ConsumerFactory consumerFactory) {
        super(new EventBus(CLIENT_BUS_ID));
        checkNotNull(config, "Invalid config.");
        // assign a client group
        config.getConsumerConfig().setGroupId(CLIENT_GROUP);
        // adapt the client event bus using kafka messages
        eventAdaptor = new KafkaClientEventAdaptor(getEventBus(), new FstCodec(), config, producerFactory, consumerFactory);

    }

    @Override
    protected void startUp() throws Exception {
        super.startUp();
        eventAdaptor.startAsync().awaitRunning();
        LOG.debug("Kafka client started.");
    }

    @Override
    protected void shutDown() throws Exception {
        super.shutDown();
        eventAdaptor.stopAsync().awaitTerminated();
        LOG.debug("Kafka client shutdown.");
    }
}