pl.nask.hsn2.connector.AbstractConnector.java Source code

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Here is the source code for pl.nask.hsn2.connector.AbstractConnector.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.connector;

import java.io.IOException;

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.QueueingConsumer;

public abstract class AbstractConnector implements Connector {

    protected static Connection connection = null;
    protected Channel channel = null;
    protected QueueingConsumer consumer = null;
    protected String publisherQueueName = null;

    protected AbstractConnector(String connectorAddress, String publisherQueueName) throws BusException {
        if (connection == null) {
            connect(connectorAddress);
        }
        try {
            channel = connection.createChannel();
            channel.basicQos(1);
        } catch (IOException e) {
            throw new BusException("Can't create channel.", e);
        }

        this.publisherQueueName = publisherQueueName;
    }

    private void connect(String connectorAddress) throws BusException {
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost(connectorAddress);
        try {
            connection = factory.newConnection();
        } catch (IOException e) {
            throw new BusException("Can't create connection.", e);
        }
    }

    protected AbstractConnector(String connectorAddress, String publisherQueueName, String consumerQueueName)
            throws BusException {
        this(connectorAddress, publisherQueueName);
        setConsumer(consumerQueueName, false);
    }

    /* (non-Javadoc)
     * @see pl.nask.hsn2.connector.Connector#close()
     */
    @Override
    public void close() throws BusException {
        try {
            if (connection != null && connection.isOpen()) {
                connection.close(500);
            }
        } catch (IOException e) {
            throw new BusException("Can't close connection.", e);
        }
    }

    protected void setConsumer(String consumerQueueName, boolean autoACK) throws BusException {
        consumer = new QueueingConsumer(channel);
        try {
            channel.basicConsume(consumerQueueName, autoACK, consumer);
        } catch (IOException e) {
            close();
            throw new BusException(e);
        }
    }

    abstract protected void closeChannel();
}