org.eclipse.smila.connectivity.queue.AbstractBrokerPropertiesConfigImpl.java Source code

Introduction

Here is the source code for org.eclipse.smila.connectivity.queue.AbstractBrokerPropertiesConfigImpl.java

Source

/***********************************************************************************************************************
 * Copyright (c) 2008 empolis GmbH and brox IT Solutions GmbH. All rights reserved. This program and the accompanying
 * materials are made available under the terms of the Eclipse Public License v1.0 which accompanies this distribution,
 * and is available at http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors: Ivan Churkin (brox IT Solutions GmbH) - initial creator Sebastian Voigt (Brox IT Solutions GmbH) -
 * initial creator
 **********************************************************************************************************************/
package org.eclipse.smila.connectivity.queue;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.JMSException;
import javax.jms.Session;
import javax.naming.Context;
import javax.naming.InitialContext;

import org.apache.commons.io.IOUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.eclipse.smila.utils.config.ConfigUtils;
import org.eclipse.smila.utils.workspace.WorkspaceHelper;

/**
 * The Class AbstractBrokerImpl.
 */
public abstract class AbstractBrokerPropertiesConfigImpl implements ConnectivityBroker {

    /**
     * The Constant CONFIG_JMS_NAME.
     */
    protected static final String CONFIG_JMS_NAME = "jms.properties";

    /**
     * The Constant PROPERTY_PROVIDER_URL.
     */
    protected static final String PROPERTY_PROVIDER_URL = "java.naming.provider.url";

    /**
     * The Constant PROPERTY_DEFAULT_DIRECTORY_PREFIX.
     */
    protected static final String PROPERTY_DEFAULT_DIRECTORY_PREFIX = "org.apache.activemq.default.directory.prefix";

    /**
     * The Constant DEFAULT_DLQ.
     */
    protected static final String DLQ = "ActiveMQ.DLQ";

    /**
     * The _session.
     */
    protected Session _session;

    /**
     * The _log.
     */
    protected final Log _log = LogFactory.getLog(getClass());

    /**
     * The _connection.
     */
    protected Connection _connection;

    /**
     * Gets the bundle id.
     * 
     * @return the bundle id
     */
    protected abstract String getBundleId();

    /**
     * {@inheritDoc}
     * 
     * @see org.eclipse.smila.connectivity.queue.ConnectivityBroker#start()
     */
    public synchronized void start() throws BrokerException {
        Properties properties;
        try {
            properties = loadJMSProperties();
        } catch (final Exception e) {
            throw new BrokerException("Unable to load JMS properties", e);
        }
        Context ctx;
        try {
            ctx = new InitialContext(properties);
            System.setProperty(PROPERTY_DEFAULT_DIRECTORY_PREFIX,
                    properties.getProperty(PROPERTY_DEFAULT_DIRECTORY_PREFIX));
            final ConnectionFactory factory = (ConnectionFactory) ctx.lookup("ConnectionFactory");
            _connection = factory.createConnection();
            _connection.start();
            _session = _connection.createSession(true, Session.SESSION_TRANSACTED);
            _session.createQueue(DLQ);
        } catch (final Exception e) {
            throw new BrokerException("Error initializing Queue Broker with JMS properties resp. configuration", e);
        } finally {
            if (_session != null) {
                try {
                    _session.commit();
                } catch (final JMSException e) {
                    ;// nothing
                }
                try {
                    _session.close();
                } catch (final JMSException e) {
                    ;// nothing
                }
            }
        }
    }

    /**
     * Load jms properties.
     * 
     * @return the properties
     * 
     * @throws IOException
     *           Signals that an I/O exception has occurred.
     */
    private Properties loadJMSProperties() throws IOException {
        final InputStream inputStream = ConfigUtils.getConfigStream(getBundleId(), CONFIG_JMS_NAME);
        final Properties properties = new Properties();
        try {
            properties.load(inputStream);
        } finally {
            IOUtils.closeQuietly(inputStream);
        }
        if (!properties.containsKey(PROPERTY_DEFAULT_DIRECTORY_PREFIX)) {
            final File folder = WorkspaceHelper.createWorkingDir(getBundleId());
            // path should ends with "/" because it's just used as a prefix
            String path = folder.getPath();
            if (!path.endsWith("/")) {
                path = path + "/";
            }
            properties.put(PROPERTY_DEFAULT_DIRECTORY_PREFIX, path);
        }
        return properties;
    }

    /**
     * Stop.
     */
    public synchronized void stop() {
        if (_session != null) {
            try {
                _session.close();
            } catch (final JMSException e) {
                _log.error("", e);
            }
            _session = null;
        }
        if (_connection != null) {
            try {
                _connection.stop();
            } catch (final JMSException e) {
                _log.error("", e);
            }
            _connection = null;
        }
    }

}