JWebSocketBeanFactory.java

//    ---------------------------------------------------------------------------
//    jWebSocket - jWebSocket Spring Bean Factory
//  Copyright (c) 2011 Innotrade GmbH, jWebSocket.org
//    ---------------------------------------------------------------------------
//    This program is free software; you can redistribute it and/or modify it
//    under the terms of the GNU Lesser 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 Lesser General Public License for
//    more details.
//    You should have received a copy of the GNU Lesser General Public License along
//    with this program; if not, see <http://www.gnu.org/licenses/lgpl.html>.
//    ---------------------------------------------------------------------------
package org.jwebsocket.spring;

import java.util.Map;
import javolution.util.FastMap;
import org.jwebsocket.config.JWebSocketConfig;
import org.jwebsocket.util.Tools;
import org.springframework.beans.factory.support.DefaultListableBeanFactory;
import org.springframework.beans.factory.xml.XmlBeanDefinitionReader;
import org.springframework.context.support.GenericApplicationContext;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.FileSystemResource;

/**
 * This is required to load the bootstrap.xml config file. It provides a shared
 * beanFactory for all plug-ins and this allows inter-dependencies between the
 * plug-ins and core components.
 *
 * @author alexanderschulze
 * @author kyberneees
 */
public class JWebSocketBeanFactory {

    private static GenericApplicationContext mGlobalContext = null;
    private static Map<String, GenericApplicationContext> mContextMap = new FastMap<String, GenericApplicationContext>();

    public static GenericApplicationContext getInstance() {
        if (null == mGlobalContext) {
            mGlobalContext = new GenericApplicationContext(new DefaultListableBeanFactory());
        }
        return mGlobalContext;
    }

    public static GenericApplicationContext getInstance(String aNamespace) {
        if (!mContextMap.containsKey(aNamespace)) {
            mContextMap.put(aNamespace, new GenericApplicationContext(new DefaultListableBeanFactory()));
            //Setting the default (core) application context as parent
            mContextMap.get(aNamespace).setParent(mGlobalContext);
        }
        return mContextMap.get(aNamespace);
    }

    /**
     * Load beans from a configuration file into the global bean factory
     *
     * @param aPath
     * @param aBeanClassLoader
     */
    public static void load(String aPath, ClassLoader aBeanClassLoader) {
        load(null, aPath, aBeanClassLoader);
    }

    /**
     * Load beans from a configuration file into a specific bean factory
     *
     * @param aNamespace
     * @param aPath
     * @param aClassLoader
     */
    public static void load(String aNamespace, String aPath, ClassLoader aClassLoader) {
        String lPath = Tools.expandEnvVarsAndProps(aPath);

        XmlBeanDefinitionReader lXmlReader;
        if (null != aNamespace) {
            lXmlReader = new XmlBeanDefinitionReader(getInstance(aNamespace));
        } else {
            lXmlReader = new XmlBeanDefinitionReader(getInstance());
        }
        
         lXmlReader.setBeanClassLoader(aClassLoader);

        // if no JWEBSOCKET_HOME environment variable set 
        // then use the classpath resource, otherwise the file system resource
        // System.out.println("getJWebSocketHome: '" + JWebSocketConfig.getJWebSocketHome() + "'...");
        if (JWebSocketConfig.getJWebSocketHome().isEmpty()) {
            // System.out.println("Loading resource from classpath: " + aPath + "...");
            lXmlReader.loadBeanDefinitions(new ClassPathResource(lPath));
        } else {
            // System.out.println("Loading resource from filesystem: " + aPath + "...");
            lXmlReader.loadBeanDefinitions(new FileSystemResource(lPath));
        }
    }
}