pl.nask.hsn2.bus.rabbitmq.endpoint.RbtConsumeEndPoint.java Source code

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Here is the source code for pl.nask.hsn2.bus.rabbitmq.endpoint.RbtConsumeEndPoint.java

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/*
 * Copyright (c) NASK, NCSC
 * 
 * This file is part of HoneySpider Network 2.0.
 * 
 * This is a 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 3 of the License, or
 * (at your option) any later version.
    
 * This program 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.  See the
 * GNU General Public License for more details.
    
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package pl.nask.hsn2.bus.rabbitmq.endpoint;

import java.io.IOException;
import java.util.HashSet;
import java.util.Set;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import pl.nask.hsn2.bus.api.BusException;
import pl.nask.hsn2.bus.api.endpoint.ConsumeEndPoint;
import pl.nask.hsn2.bus.api.endpoint.ConsumeEndPointHandler;
import pl.nask.hsn2.bus.rabbitmq.RbtUtils;

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.Consumer;
import com.rabbitmq.client.ShutdownSignalException;

public class RbtConsumeEndPoint implements ConsumeEndPoint {

    private static final Logger LOGGER = LoggerFactory.getLogger(RbtConsumeEndPoint.class);

    private String consumerQueueName = null;
    private ConsumeEndPointHandler responseHandler = null;
    private Connection connection;
    private Boolean closed = true;
    private final Object lock = new Object();
    private boolean autoack = true;
    private int numberOfThreads = 1;

    private Set<Channel> channels = new HashSet<Channel>();

    public RbtConsumeEndPoint(Connection connection, ConsumeEndPointHandler responseHandler,
            String consumerQueueName, boolean autoack) throws BusException {
        this(connection, responseHandler, consumerQueueName, autoack, 1);
    }

    public RbtConsumeEndPoint(Connection connection, ConsumeEndPointHandler responseHandler,
            String consumerQueueName, boolean autoack, int numberOfThreads) throws BusException {
        this.connection = connection;
        this.consumerQueueName = consumerQueueName;
        this.responseHandler = responseHandler;
        this.autoack = autoack;
        this.numberOfThreads = numberOfThreads;
        open();
    }

    @Override
    public final boolean isClosed() {
        return closed;
    }

    @Override
    public final void open() throws BusException {
        synchronized (lock) {
            if (isClosed()) {
                try {
                    for (int consumeCount = 0; consumeCount < this.numberOfThreads; consumeCount++) {
                        createConsumer();
                    }
                    closed = false;
                } catch (BusException ex) {
                    for (Channel channel : this.channels) {
                        RbtUtils.closeChannel(channel);
                    }
                    this.channels.clear();
                    closed = true;
                    throw ex;
                }
            }
        }
    }

    /**
     * This method creates single consumer.
     * 
     * @throws BusException If there is a problem with creating consumer.
     */
    private void createConsumer() throws BusException {
        Channel channel = null;
        try {
            channel = connection.createChannel();
        } catch (IOException e) {
            LOGGER.error("Error creating channel.");
            throw new BusException("Can't create channel.", e);
        }

        Consumer consumer = new RbtDefaultConsumer(autoack, channel, responseHandler) {
            @Override
            public void handleShutdownSignal(String consumerTag, ShutdownSignalException sig) {
                try {
                    close();
                } catch (BusException ex) {
                    LOGGER.error("Error during shutdown customer.", ex);
                }
                super.handleShutdownSignal(consumerTag, sig);
            }
        };

        try {
            channel.basicConsume(consumerQueueName, this.autoack, consumer);
            this.channels.add(channel);
        } catch (IOException e) {
            LOGGER.error("Error creating consumer.");
            throw new BusException("Can't create consumer.", e);
        }
    }

    @Override
    public final void close() throws BusException {
        synchronized (lock) {
            for (Channel channel : this.channels) {
                RbtUtils.closeChannel(channel);
            }
            this.channels.clear();
        }
        closed = true;
    }
}