org.commonjava.indy.subsys.kafka.IndyKafkaProducer Maven / Gradle / Ivy

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/**
 * Copyright (C) 2011-2020 Red Hat, Inc. (https://github.com/Commonjava/indy)
 *
 * 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 org.commonjava.indy.subsys.kafka;

import org.apache.kafka.clients.producer.Callback;
import org.apache.kafka.clients.producer.KafkaProducer;
import org.apache.kafka.clients.producer.ProducerRecord;
import org.commonjava.indy.subsys.kafka.conf.KafkaConfig;
import org.commonjava.indy.subsys.kafka.util.LogbackFormatter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import javax.enterprise.context.ApplicationScoped;
import javax.inject.Inject;
import java.io.IOException;
import java.util.Properties;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import java.util.function.Consumer;

@ApplicationScoped
public class IndyKafkaProducer
{
    private final Logger logger = LoggerFactory.getLogger( this.getClass() );

    @Inject
    private KafkaConfig config;

    private KafkaProducer kafkaProducer;

    private final Consumer exceptionHandler = ( e ) -> logger.error( "Send to Kafka failed", e );

    private final Callback callback = ( metadata, exception ) ->
    {
        if ( exception != null )
        {
            exceptionHandler.accept( exception );
        }
        else
        {
            logger.trace( "Message sent to Kafka. Partition:{}, timestamp {}.", metadata.partition(),
                          metadata.timestamp() );
        }
    };

    public IndyKafkaProducer( Properties properties )
    {
        this.kafkaProducer = new KafkaProducer<>( properties );
    }

    @PostConstruct
    private void init()
    {
        if ( config.isEnabled() )
        {
            Properties props = new Properties();
            props.putAll( config.getConfiguration() );
            kafkaProducer = new KafkaProducer<>( props );
        }
    }

    /**
     * Non-blocking send. The message will not be really available to consumers until flush()
     * or close() is called, or until another blocking send is called.
     */
    public void send( String topic, String message ) throws IOException
    {
        send( topic, message, null );
    }

    /**
     * Non-blocking send with a logback formatter to format the message.
     */
    public void send( String topic, String message, LogbackFormatter formatter ) throws IOException
    {
        doKafkaSend( topic, message, formatter );
    }

    /**
     * Blocking send. The message will be available to consumers immediately. Wait for at most the given time
     * for the operation to complete.
     */
    public void send( String topic, String message, long timeoutMillis )
                    throws IOException, InterruptedException, ExecutionException, TimeoutException
    {
        send( topic, message, null, timeoutMillis );
    }

    /**
     * Blocking send with a logback formatter to format the message.
     */
    public void send( String topic, String message, LogbackFormatter formatter, long timeoutMillis )
                    throws IOException, InterruptedException, ExecutionException, TimeoutException
    {
        Future future = doKafkaSend( topic, message, formatter );
        if ( future != null )
        {
            future.get( timeoutMillis, TimeUnit.MILLISECONDS );
        }
    }

    //
    private Future doKafkaSend( String topic, String message, LogbackFormatter formatter ) throws IOException
    {
        if ( kafkaProducer != null )
        {
            ProducerRecord producerRecord =
                            new ProducerRecord<>( topic, formatter != null ? formatter.format( message ) : message );

            return kafkaProducer.send( producerRecord, callback );
        }
        return null;
    }

    /**
     * Flush all the non-blocking send messages so that the consumers can see them.
     */
    public void flush()
    {
        if ( kafkaProducer != null )
        {
            kafkaProducer.flush();
        }
    }

    @PreDestroy
    public void close() throws IOException
    {
        if ( kafkaProducer != null )
        {
            logger.info( "Closing {}", this.getClass() );
            kafkaProducer.close();
        }
    }

}