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• AbstractEventProducer.java

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org.cg.eventbus.producer.AbstractEventProducer Maven / Gradle / Ivy

/**
 * 
 */
package org.cg.eventbus.producer;

import java.util.List;
import java.util.Properties;

import org.apache.commons.configuration.Configuration;
import org.apache.commons.configuration.ConfigurationConverter;
import org.apache.commons.configuration.PropertiesConfiguration;
import org.apache.kafka.clients.producer.Callback;
import org.apache.kafka.clients.producer.KafkaProducer;
import org.apache.kafka.clients.producer.ProducerRecord;
import org.apache.kafka.clients.producer.RecordMetadata;
import org.apache.log4j.Logger;
import org.cg.eventbus.ConfigUtil;
import org.cg.eventbus.ICallback;
import org.cg.eventbus.ICallback.Response;
import org.cg.eventbus.IProducer;

/**
 * Producer using string key to partition
 * 
 * @author yanlinwang,liang.li
 *
 */
public abstract class AbstractEventProducer implements
		IProducer {

	// Constants for producer

	public static final String DEFAULT_BROKER_LIST = "localhost:9092";

	public static final String PRO_TYPE_ASYNC = "async";

	public static final String NO_ACK = "0";
	public static final String LEADER_ACK = "1";
	public static final String REPLICAS_ACK = "-1";
	public static final String DEFAULT_PARTITION = "kafka.producer.DefaultPartitioner";

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

	/** topic name for this producer */
	private String topic;

	/** configuration for producer */
	private Properties producerConfig;

	/* configuration passing along*/
	private Configuration config;
	
	/** producer */
	private KafkaProducer producer;

	public AbstractEventProducer(String cfgPath) throws Exception {
		this(cfgPath, null);
	}
	

	public AbstractEventProducer(String cfgPath, String prefix) throws Exception {
		if (prefix==null)
			initialize (new PropertiesConfiguration(cfgPath));
		else
			initialize(ConfigUtil.extractConfiguration(ConfigurationConverter.getProperties(new PropertiesConfiguration(cfgPath)), prefix));
	}
		
	public AbstractEventProducer(Configuration config, String prefix) 
			throws Exception {
		if (null == prefix)
			initialize(config);
		else
			initialize(ConfigUtil.extractConfiguration(config, prefix));
	}

	public AbstractEventProducer(Configuration config)
			throws Exception {
		initialize(config);
	}

	protected void initialize(Configuration config) throws Exception {
		this.config = config;
		ProducerConfigurator.validate(config);
		producerConfig = ConfigurationConverter.getProperties(config);
		topic = config.getString(PRODUCER_TOPIC);
		producer = new KafkaProducer(producerConfig);
		logger.info("producer initialized");
	}

	
	
	/**
	 * @return the config
	 */
	public Configuration getConfig() {
		return config;
	}


	@Override
	public void send(V msg, final ICallback callback) {
		if (null == msg)
			return;
		K key = this.getKey(msg);
		send(key, msg, callback);
	}
	
	@Override
	public void send(List msgs, ICallback callback) {
		if (msgs==null) {
			logger.error("ignore null events");
			return;
		}
		for (V msg : msgs) {
			send (msg, callback);
		}
	}
	
	@Override
	public void send(K key, V msg, final ICallback callback) {
		if (null == key || null == msg)
			return;

		ProducerRecord data = new ProducerRecord(topic, key, msg);
		producer.send(data, new Callback() {
			public void onCompletion(RecordMetadata metadata, Exception e) {
				Response response = new Response ();
				response.setTopic(metadata.topic());
				response.setOffset(metadata.offset());
				response.setPartition(metadata.partition());
				if (callback != null)
					callback.onCompletion(response, e);
				if (e != null)
					logger.error("failed to send event, response = " + response.toString() , e );
			}
		});

	}
	

	/**
	 * @return the logger
	 */
	public Logger getLogger() {
		return logger;
	}

	@Override
	public void send(List keys, List msgs, ICallback callback) {
		if (null == keys || null == msgs ||
				keys.size() < 1 || msgs.size() < 1)
			return;
		if (keys.size() != msgs.size()) {
			logger.error("Sizes of keys and messages are different. " + keys.size() + ":" + msgs.size());
			return;
		}
		for (int i=0; i