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|
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package Com.Elect.GLEP.Clients.Locator ;
/**
*
*
*/
import Com.Elect.GLEP.clients.Locator.ServiceLocatorException;
import javax.jms.ConnectionFactory;
import javax.jms.Destination;
import javax.naming.Context;
import javax.naming.InitialContext;
import java.util.HashMap;
import java.util.Map;
import java.util.logging.Logger;
import Com.Elect.GLEP.Util.Constants;
/**
* This class enables Swing client to look for resources (like home, remote interfaces...).
* It follows the singleton pattern
*/
public class Service {
// ======================================
// = Attributes =
// ======================================
private final String cname = this.getClass().getName() ;
private Logger logger = Logger.getLogger(Constants.LOGGER_CLIENT) ;
private Context initalContext ;
private Map<String, Object> cache ;
// ======================================
// = Singleton =
// ======================================
private static final Service instance = new Service();
public static Service getInstance() {
return instance;
}
private Service() throws ServiceLocatorException {
try {
initalContext = new InitialContext();
cache = new HashMap<String, Object>();
} catch (Exception e) {
throw new ServiceLocatorException(e);
}
}
// ======================================
// = Business methods =
// ======================================
/**
* will get the ejb Local home factory. If this ejb home factory has already been
* clients need to cast to the type of EJBHome they desire
*
* @param jndiName JNDI name of the EJB that we are looking for
* @return the EJB Home corresponding to the homeName
* @throws ServiceLocatorException thrown if lookup problems
*/
public Object getRemoteInterface(String jndiName) throws ServiceLocatorException {
String methodName = "getRemoteInterface" ;
logger.entering(cname, methodName, jndiName) ;
Object remoteInterface = getRemoteObject(jndiName) ;
return remoteInterface ;
}
/**
* @param connFactoryName Name of the connection factory that we are looking for
* @return the factory for the factory to get queue connections from
* @throws ServiceLocatorException thrown if lookup problems
*/
public ConnectionFactory getConnectionFactory(String connFactoryName) throws ServiceLocatorException {
String methodName = "getConnectionFactory";
logger.entering(cname, methodName, connFactoryName);
ConnectionFactory factory = (ConnectionFactory) getRemoteObject(connFactoryName);
return factory;
}
public Destination getDestination(String destinationName) {
String methodName = "getDestination" ;
logger.entering(cname, methodName, destinationName) ;
Destination destination = (Destination) getRemoteObject(destinationName) ;
return destination;
}
// ======================================
// = Private methods =
// ======================================
private synchronized Object getRemoteObject(String jndiName) throws ServiceLocatorException {
String methodName = "getObject" ;
logger.entering(cname, methodName, jndiName) ;
Object remoteObject = cache.get(jndiName);
if (remoteObject == null) {
try {
remoteObject = initalContext.lookup(jndiName);
cache.put(jndiName, remoteObject);
} catch (Exception e) {
throw new ServiceLocatorException(e);
}
}
return remoteObject;
}
} |
