org.apache.pulsar.connect.rabbitmq.RabbitMQSource.java Source code

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Here is the source code for org.apache.pulsar.connect.rabbitmq.RabbitMQSource.java

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/**
 * 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 org.apache.pulsar.connect.rabbitmq;

import com.rabbitmq.client.*;
import org.apache.pulsar.connect.core.Message;
import org.apache.pulsar.connect.core.PushSource;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.util.Map;
import java.util.concurrent.CompletableFuture;
import java.util.function.Function;

/**
 * A simple connector to consume messages from a RabbitMQ queue
 */
public class RabbitMQSource implements PushSource<byte[]> {

    private static Logger logger = LoggerFactory.getLogger(RabbitMQSource.class);

    private Function<Message<byte[]>, CompletableFuture<Void>> consumer;
    private Connection rabbitMQConnection;
    private Channel rabbitMQChannel;
    private RabbitMQConfig rabbitMQConfig;

    @Override
    public void setConsumer(Function<Message<byte[]>, CompletableFuture<Void>> consumeFunction) {
        this.consumer = consumeFunction;
    }

    @Override
    public void open(Map<String, String> config) throws Exception {
        rabbitMQConfig = RabbitMQConfig.load(config);
        if (rabbitMQConfig.getAmqUri() == null || rabbitMQConfig.getQueueName() == null) {
            throw new IllegalArgumentException("Required property not set.");
        }
        ConnectionFactory connectionFactory = new ConnectionFactory();
        connectionFactory.setUri(rabbitMQConfig.getAmqUri());
        rabbitMQConnection = connectionFactory.newConnection(rabbitMQConfig.getConnectionName());
        logger.info("A new connection to {}:{} has been opened successfully.",
                rabbitMQConnection.getAddress().getCanonicalHostName(), rabbitMQConnection.getPort());
        rabbitMQChannel = rabbitMQConnection.createChannel();
        rabbitMQChannel.queueDeclare(rabbitMQConfig.getQueueName(), false, false, false, null);
        com.rabbitmq.client.Consumer consumer = new RabbitMQConsumer(this.consumer, rabbitMQChannel);
        rabbitMQChannel.basicConsume(rabbitMQConfig.getQueueName(), consumer);
        logger.info("A consumer for queue {} has been successfully started.", rabbitMQConfig.getQueueName());
    }

    @Override
    public void close() throws Exception {
        rabbitMQChannel.close();
        rabbitMQConnection.close();
    }

    private class RabbitMQConsumer extends DefaultConsumer {
        private Function<Message<byte[]>, CompletableFuture<Void>> consumeFunction;

        public RabbitMQConsumer(Function<Message<byte[]>, CompletableFuture<Void>> consumeFunction,
                Channel channel) {
            super(channel);
            this.consumeFunction = consumeFunction;
        }

        @Override
        public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties,
                byte[] body) throws IOException {
            consumeFunction.apply(new RabbitMQMessage(body));
        }
    }

    static private class RabbitMQMessage implements Message<byte[]> {
        private byte[] data;

        public RabbitMQMessage(byte[] data) {
            this.data = data;
        }

        @Override
        public byte[] getData() {
            return data;
        }
    }
}