/*
* Copyright 1999,2004 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.naming.factory;
import java.net.URL;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.naming.spi.ObjectFactory;
import tyrex.tm.TransactionDomain;
import tyrex.tm.DomainConfigurationException;
import tyrex.tm.RecoveryException;
/**
* Abstract superclass of any factory that creates objects from Tyrex.<br>
*
* Subclasses can use getTransactionDomain() to handle the retrieval and
* creation of the TransactionDomain.
*
* Tyrex is an open-source transaction manager, developed by Assaf Arkin and
* exolab.org. See the <a href="http://tyrex.exolab.org/">Tyrex homepage</a>
* for more details about Tyrex and downloads.
*
* @author David Haraburda
* @version $Revision: 1.2 $ $Date: 2004/08/26 21:44:37 $
*/
public abstract class TyrexFactory implements ObjectFactory {
// ----------------------------------------------------------- Constructors
// -------------------------------------------------------------- Constants
// ----------------------------------------------------- Instance Variables
// ------------------------------------------------------ Protected Methods
/**
* Get (and if necessary, create) the active TransactionDomain
*
* This class checks to see if there is already a TransactionDomain
* setup and instantiated. If so, it is returned, otherwise one is
* created and initialized using properties obtained from JNDI.
*/
protected TransactionDomain getTransactionDomain() throws NamingException {
TransactionDomain domain = null;
InitialContext initCtx = new InitialContext();
String config = initCtx.lookup("java:comp/env/" +
Constants.TYREX_DOMAIN_CONFIG).toString();
String name = initCtx.lookup("java:comp/env/" +
Constants.TYREX_DOMAIN_NAME).toString();
if (config != null && name != null) {
try {
domain = TransactionDomain.getDomain(name);
} catch(Throwable t) {
// Tyrex throws exceptions if required classes aren't found.
log("Error loading Tyrex TransactionDomain", t);
throw new NamingException
("Exception loading TransactionDomain: " + t.getMessage());
}
if ((domain == null)
|| (domain.getState() == TransactionDomain.TERMINATED)) {
URL configURL = Thread.currentThread().getContextClassLoader()
.getResource(config);
if (configURL == null)
throw new NamingException
("Could not load Tyrex domain config file");
try {
domain =
TransactionDomain.createDomain(configURL.toString());
} catch(DomainConfigurationException dce) {
throw new NamingException
("Could not create TransactionDomain: "
+ dce.getMessage());
}
}
} else {
throw new NamingException
("Specified config file or domain name "
+ "parameters are invalid.");
}
if (domain.getState() == TransactionDomain.READY) {
try {
domain.recover();
} catch( RecoveryException re ) {
throw new NamingException
("Could not activate TransactionDomain: "
+ re.getMessage() );
}
}
return domain;
}
// -------------------------------------------------------- Private Methods
private void log(String message) {
System.out.print("TyrexFactory: ");
System.out.println(message);
}
private void log(String message, Throwable exception) {
log(message);
exception.printStackTrace(System.out);
}
}