/*
============================================================================
The Apache Software License, Version 1.1
============================================================================
Copyright (C) 1999-2003 The Apache Software Foundation. All rights reserved.
Redistribution and use in source and binary forms, with or without modifica-
tion, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
3. The end-user documentation included with the redistribution, if any, must
include the following acknowledgment: "This product includes software
developed by the Apache Software Foundation (http://www.apache.org/)."
Alternately, this acknowledgment may appear in the software itself, if
and wherever such third-party acknowledgments normally appear.
4. The names "Apache Cocoon" and "Apache Software Foundation" must not be
used to endorse or promote products derived from this software without
prior written permission. For written permission, please contact
apache@apache.org.
5. Products derived from this software may not be called "Apache", nor may
"Apache" appear in their name, without prior written permission of the
Apache Software Foundation.
THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
APACHE SOFTWARE FOUNDATION OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLU-
DING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
This software consists of voluntary contributions made by many individuals
on behalf of the Apache Software Foundation and was originally created by
Stefano Mazzocchi <stefano@apache.org>. For more information on the Apache
Software Foundation, please see <http://www.apache.org/>.
*/
package org.apache.cocoon.components.web3.impl;
import org.apache.cocoon.components.web3.Web3DataSource;
import org.apache.avalon.framework.activity.Disposable;
import org.apache.avalon.framework.service.ServiceException;
import org.apache.avalon.framework.service.ServiceManager;
import org.apache.avalon.framework.service.ServiceSelector;
import org.apache.avalon.framework.service.Serviceable;
import org.apache.avalon.framework.thread.ThreadSafe;
import org.apache.avalon.framework.configuration.Configuration;
import org.apache.avalon.framework.configuration.Configurable;
import org.apache.avalon.framework.configuration.ConfigurationException;
import org.apache.avalon.framework.logger.AbstractLogEnabled;
import org.apache.avalon.framework.logger.LogEnabled;
import org.apache.cocoon.util.ClassUtils;
import java.util.Enumeration;
import java.util.Hashtable;
import EDU.oswego.cs.dl.util.concurrent.Mutex;
/**
* The Default implementation for R3DataSources in Web3. This uses the
* normal <code>com.sap.mw.jco.JCO</code> classes.
*
* @author <a href="mailto:michael.gerzabek@at.efp.cc">Michael Gerzabek</a>
* @since 2.1
* @version CVS $Id: Web3DataSourceSelectorImpl.java,v 1.6 2004/02/06 22:54:05 joerg Exp $
*/
public class Web3DataSourceSelectorImpl
extends AbstractLogEnabled
implements ServiceSelector, Disposable, Serviceable, Configurable, ThreadSafe {
/** The service manager instance */
protected ServiceManager manager = null;
protected Configuration configuration = null;
private static Hashtable pools = new Hashtable();
private static Mutex lock = new Mutex();
/**
* Set the current <code>ServiceManager</code> instance used by this
* <code>Serviceable</code>.
*/
public void service(ServiceManager manager) throws ServiceException {
this.manager = manager;
}
public void configure(Configuration configuration)
throws ConfigurationException {
if (null != configuration) {
this.configuration = configuration;
} else {
getLogger().error(
"Couldn't configure Web3DataSourceSelector."
+ " No configuration provided!");
}
}
public boolean isSelectable(Object obj) {
return Web3DataSourceSelectorImpl.pools.containsKey(obj);
}
public Object select(Object obj) throws ServiceException {
Web3DataSource pool = null;
try {
Web3DataSourceSelectorImpl.lock.acquire();
if (null != obj) {
if (Web3DataSourceSelectorImpl.pools.containsKey(obj)) {
pool = (Web3DataSource)Web3DataSourceSelectorImpl.pools.get(obj);
} else {
Configuration a[] = this.configuration.getChildren("backend");
Configuration c = null;
if (null != a)
for (int i = 0; i < a.length; i++) {
try {
String s = a[i].getAttribute("name");
if (null != s && s.equals(obj.toString())) {
// a backend with a name can be defined only once
c = a[i];
break;
}
} catch (ConfigurationException x) {
// this configuration element has no mandatory
//attribute name
}
}
// No configuration for this backend-id found!
if (null == c) {
return null;
}
Class theClass =
Class.forName(
c.getChild("class").getValue(
"org.apache.cocoon.components.web3.impl.Web3DataSourceImpl"),
true,
ClassUtils.getClassLoader());
pool = (Web3DataSource) theClass.newInstance();
if (pool instanceof LogEnabled) {
((LogEnabled) pool).enableLogging(getLogger());
}
pool.service(this.manager);
pool.configure(c);
pool.initialize();
Web3DataSourceSelectorImpl.pools.put(obj, pool);
}
}
} catch (Exception ex) {
getLogger().error(ex.getMessage(), ex);
throw new ServiceException(null, ex.getMessage());
} finally {
Web3DataSourceSelectorImpl.lock.release();
}
getLogger().debug("Returning Web3DataSource[" + pool + "]");
return pool;
}
public void release(Object object) {
}
/** Dispose properly of the pool */
public void dispose() {
this.manager = null;
try {
Web3DataSourceSelectorImpl.lock.acquire();
String sid = null;
Web3DataSource pool;
for (Enumeration enum = Web3DataSourceSelectorImpl.pools.keys();
enum.hasMoreElements();
) {
sid = (String) enum.nextElement();
pool =
(Web3DataSource) Web3DataSourceSelectorImpl.pools.get(sid);
pool.dispose();
}
Web3DataSourceSelectorImpl.pools.clear();
} catch (Exception ex) {
} finally {
Web3DataSourceSelectorImpl.lock.release();
}
Web3DataSourceSelectorImpl.lock = null;
}
}