com.caucho.v5.pipe.rabbit.RabbitPipeImpl.java Source code

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Here is the source code for com.caucho.v5.pipe.rabbit.RabbitPipeImpl.java

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/*
 * Copyright (c) 1998-2016 Caucho Technology -- all rights reserved
 *
 * This file is part of Baratine(TM)
 *
 * Each copy or derived work must preserve the copyright notice and this
 * notice unmodified.
 *
 * Baratine is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Baratine is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
 * of NON-INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Baratine; if not, write to the
 *
 *   Free Software Foundation, Inc.
 *   59 Temple Place, Suite 330
 *   Boston, MA 02111-1307  USA
 *
 * @author Nam Nguyen
 */

package com.caucho.v5.pipe.rabbit;

import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.inject.Inject;

import com.caucho.v5.ramp.pipe.PipeAsset;
import com.rabbitmq.client.AMQP;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.DefaultConsumer;
import com.rabbitmq.client.Envelope;

import io.baratine.config.Config;
import io.baratine.service.OnDestroy;
import io.baratine.service.OnInit;
import io.baratine.service.Result;
import io.baratine.service.ServiceRef;
import io.baratine.vault.Id;

public class RabbitPipeImpl extends PipeAsset<RabbitMessage> implements RabbitPipe {
    private static final Logger _logger = Logger.getLogger(RabbitPipeImpl.class.toString());

    private @Id String _id;

    @Inject
    private Config _c;

    private RabbitConfig _config;

    private Connection _conn;
    private Channel _channel;

    private String _consumerTag;

    private RabbitPipeImpl _self;

    @Override
    public String id() {
        return _id;
    }

    @OnInit
    public void onInit(Result<Void> result) {
        _self = ServiceRef.current().service(_id).as(RabbitPipeImpl.class);

        try {
            _config = RabbitConfig.from(_c, _id);

            if (_logger.isLoggable(Level.FINE)) {
                _logger.log(Level.FINE, "onInit: " + _id + ", " + _config);
            }

            connect();

            result.ok(null);
        } catch (Exception e) {
            _logger.log(Level.WARNING, "onInit: cannot connect, " + _id + ", " + _config, e);

            result.fail(e);
        }
    }

    private void connect() throws Exception {
        ConnectionFactory factory = new ConnectionFactory();
        factory.setUri(_config.uri());

        try {
            _conn = factory.newConnection();
            _channel = _conn.createChannel();

            AMQP.Queue.DeclareOk responseQueue = _channel.queueDeclare(_config.queue(), _config.durable(),
                    _config.exclusive(), _config.autoDelete(), null);

            if (!"".equals(_config.exchange())) {
                AMQP.Exchange.DeclareOk responseExchange = _channel.exchangeDeclare(_config.exchange(),
                        _config.exchangeType(), _config.durable(), _config.autoDelete(), false, null);

                _channel.queueBind(responseQueue.getQueue(), _config.exchange(), _config.routingKey());
            }

            _logger.log(Level.INFO, "connect: " + _id + ", actual queue=" + responseQueue.getQueue() + ", "
                    + _config + " . " + _self);
        } catch (Exception e) {
            closeChannel();
            closeConnection();

            throw e;
        }
    }

    private void reconnect() {
        _logger.log(Level.INFO, "reconnect: " + _id);

        try {
            closeChannel();
            closeConnection();

            connect();
        } catch (Exception e) {
            _logger.log(Level.WARNING, "error reconnecting: " + _config + ", error=" + e.getMessage(), e);
        }
    }

    public void onRabbitReceive(RabbitMessage msg, Result<Void> result) {
        sendDriver(msg);

        result.ok(null);
    }

    private void closeChannel() {
        if (_channel != null) {
            try {
                Channel channel = _channel;
                _channel = null;

                channel.close();
            } catch (Exception e) {
            }
        }
    }

    private void closeConnection() {
        if (_conn != null) {
            try {
                Connection conn = _conn;
                _conn = null;

                conn.close();
            } catch (Exception e) {
            }
        }
    }

    @Override
    protected void onInitSend() {
    }

    @Override
    protected void onInitReceive() {
        if (_consumerTag != null) {
            return;
        }

        try {
            boolean isAutoAck = false;

            _consumerTag = _channel.basicConsume(_config.routingKey(), isAutoAck, new DefaultConsumer(_channel) {
                @Override
                public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties,
                        byte[] body) throws IOException {
                    RabbitMessage msg = RabbitMessage.newMessage().body(body).properties(properties)
                            .redeliver(envelope.isRedeliver());

                    long deliveryTag = envelope.getDeliveryTag();

                    _self.onRabbitReceive(msg, (Void, e) -> {
                        if (e != null) {
                            _channel.basicReject(deliveryTag, false);
                        } else {
                            _channel.basicAck(deliveryTag, false);
                        }
                    });
                }
            });
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    @Override
    protected void onSend(RabbitMessage value) {
        if (_logger.isLoggable(Level.FINEST)) {
            _logger.log(Level.FINEST, "send: " + _id + ", " + _config + ", msg=" + value);
        }

        try {
            _channel.basicPublish(_config.exchange(), _config.routingKey(), value.mandatory(), value.immediate(),
                    value.properties(), value.body());
        } catch (Exception e) {
            _logger.log(Level.WARNING, "send error: " + _id + ", " + _config + ", error=" + e.getMessage(), e);

            reconnect();

            throw new RuntimeException(e);
        }
    }

    @OnDestroy
    public void onShutdown() {
        try {
            if (_consumerTag != null) {
                _channel.basicCancel(_consumerTag);
            }

            _channel.close();
            _conn.close();
        } catch (Exception e) {
        }
    }
}