Quadcap Embeddable Server

com/quadcap/services/DataSources.java

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package com.quadcap.services;

/* Copyright 2000 - 2003 Quadcap Software.  All rights reserved.
 *
 * This software is distributed under the Quadcap Free Software License.
 * This software may be used or modified for any purpose, personal or
 * commercial.  Open Source redistributions are permitted.  Commercial
 * redistribution of larger works derived from, or works which bundle
 * this software requires a "Commercial Redistribution License"; see
 * http://www.quadcap.com/purchase.
 *
 * Redistributions qualify as "Open Source" under  one of the following terms:
 *   
 *    Redistributions are made at no charge beyond the reasonable cost of
 *    materials and delivery.
 *
 *    Redistributions are accompanied by a copy of the Source Code or by an
 *    irrevocable offer to provide a copy of the Source Code for up to three
 *    years at the cost of materials and delivery.  Such redistributions
 *    must allow further use, modification, and redistribution of the Source
 *    Code under substantially the same terms as this license.
 *
 * Redistributions of source code must retain the copyright notices as they
 * appear in each source code file, these license terms, and the
 * disclaimer/limitation of liability set forth as paragraph 6 below.
 *
 * Redistributions in binary form must reproduce this Copyright Notice,
 * these license terms, and the disclaimer/limitation of liability set
 * forth as paragraph 6 below, in the documentation and/or other materials
 * provided with the distribution.
 *
 * The Software is provided on an "AS IS" basis.  No warranty is
 * provided that the Software is free of defects, or fit for a
 * particular purpose.  
 *
 * Limitation of Liability. Quadcap Software shall not be liable
 * for any damages suffered by the Licensee or any third party resulting
 * from use of the Software.
 */

import java.io.FileReader;

import java.util.HashMap;
import java.util.Hashtable;
import java.util.Properties;

import java.lang.ref.WeakReference;

import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.Name;
import javax.naming.NameAlreadyBoundException;
import javax.naming.NamingException;
import javax.naming.RefAddr;
import javax.naming.Reference;
import javax.naming.spi.ObjectFactory;

import com.quadcap.server.Service;
import com.quadcap.server.ServiceContainer;

import com.quadcap.util.Debug;

/**
 * Read datasources.xml; create any specified data sources, and bind them
 * to JNDI names
 *
 * @author Stan Bailes
 */
public class DataSources implements Service, ObjectFactory {
    static HashMap                      dss             = new HashMap();
    Context                             context;
    Properties                          props;                

    public DataSources() {}

    private static DataSources          globalDs = null;
    
//      public static void init(String initFile) throws Exception {
//          if (globalDs == null) {
//              globalDs = new DataSources();
//              Properties p = new Properties();
//              p.put("service.config", "datasources.xml");
//              globalDs.init(null, p);
//          }
//      }
    
    public void init(ServiceContainer c, Properties p)
        throws Exception
    {
        this.props = p;
        this.context = new InitialContext();
        String fileName = p.getProperty("service.config");
        DataSourcesParser dp = new DataSourcesParser();
        FileReader in = new FileReader(fileName);
        dp.parse(in, this);
    }

    public Properties getProperties() { return props; }

    public void addDataSource(DataSource ds) throws NamingException {
        addAttribute(ds.getName(), ds);
    }

    public static DataSource getDataSource(String name) {
        return (DataSource)dss.get(name);
    }

    public void addAttribute(String name, Object attr) {
        dss.put(name, attr);
        try {
            try {
                context.bind(name, attr);
            } catch (NameAlreadyBoundException ne) {
                context.rebind(name, attr);
            }
        } catch (NamingException ex) {
            Debug.print(ex);
        }
    }

    public Object getAttribute(String name) {
        return dss.get(name);
    }

    public void stop() {
    }

    public Object getObjectInstance(Object obj, Name name,
                                    Context ctx, Hashtable env)
        throws Exception
    {
        Object ret = null;
        if (obj instanceof Reference) {
            Reference ref = (Reference)obj;
            if (ref.getClassName().equals(DataSource.class.getName())) {
                RefAddr addr = ref.get("name");
                if (addr != null) {
                    ret = getDataSource(addr.getContent().toString());
                }
            }
        }
        return ret;
    }
}