/**
* EasyBeans
* Copyright (C) 2006 Bull S.A.S.
* Contact: easybeans@ow2.org
*
* This library 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 2.1 of the License, or any later version.
*
* This library 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 library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*
* --------------------------------------------------------------------------
* $Id: ClientStateful.java 5369 2010-02-24 14:58:19Z benoitf $
* --------------------------------------------------------------------------
*/
package org.ow2.easybeans.examples.statefulbean;
import java.util.Hashtable;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.transaction.UserTransaction;
/**
* Simple client of the stateless.
* @author Florent Benoit
*/
public final class ClientStateful {
/**
* First amount to buy.
*/
private static final int FIRST_BUY_AMOUNT = 10;
/**
* Second amount to buy.
*/
private static final int SECOND_BUY_AMOUNT = 20;
/**
* Third amount to buy (will be rollback).
*/
private static final int THIRD_BUY_AMOUNT = 50;
/**
* Default InitialContextFactory to use.
*/
private static final String DEFAULT_INITIAL_CONTEXT_FACTORY = "org.objectweb.carol.jndi.spi.MultiOrbInitialContextFactory";
/**
* Client class, no public constructor.
*/
private ClientStateful() {
}
/**
* Main method.
* @param args the arguments (not required)
*/
public static void main(final String[] args) {
Context initialContext = null;
try {
initialContext = getInitialContext();
} catch (NamingException e) {
System.err.println("Cannot get InitialContext: " + e);
System.exit(2);
}
StatefulRemote statefulBean = null;
try {
statefulBean = (StatefulRemote) initialContext
.lookup("org.ow2.easybeans.examples.statefulbean.StatefulBean" + "_"
+ StatefulRemote.class.getName() + "@Remote");
} catch (NamingException e) {
System.err.println("Cannot get statefulBean: " + e);
System.exit(2);
}
// We want to start transactions from client: get UserTransaction
UserTransaction utx = null;
try {
utx = (UserTransaction) initialContext.lookup("javax.transaction.UserTransaction");
} catch (NamingException e) {
System.err.println("Cannot lookup UserTransaction: " + e);
System.exit(2);
}
// First transaction (committed)
try {
System.out.println("Start a first transaction");
utx.begin();
System.out.println("First request on the new bean");
statefulBean.buy(FIRST_BUY_AMOUNT);
System.out.println("Second request on the bean");
statefulBean.buy(SECOND_BUY_AMOUNT);
System.out.println("Commit the transaction");
utx.commit();
} catch (Exception e) {
System.err.println("exception during 1st Tx: " + e);
System.exit(2);
}
// Start another transaction (rolled back)
try {
System.out.println("Start a second transaction");
utx.begin();
System.out.println("Buy " + THIRD_BUY_AMOUNT + " amount.");
statefulBean.buy(THIRD_BUY_AMOUNT);
System.out.println("Rollback the transaction");
utx.rollback();
} catch (Exception e) {
System.err.println("exception during 2nd Tx: " + e);
System.exit(2);
}
System.out.println("after rollback, value = " + statefulBean.read());
// Get the total bought, outside the transaction
int val = 0;
try {
System.out.println("Request outside any transaction");
val = statefulBean.read();
} catch (Exception e) {
System.err.println("Cannot read value on t1 : " + e);
System.exit(2);
}
System.out.println("Check that value = " + (FIRST_BUY_AMOUNT + SECOND_BUY_AMOUNT));
if (val != FIRST_BUY_AMOUNT + SECOND_BUY_AMOUNT) {
System.err.println("Bad value read: " + val);
System.exit(2);
}
System.out.println("ClientStateful OK. Exiting.");
}
/**
* @return Returns the InitialContext.
* @throws NamingException If the Context cannot be created.
*/
private static Context getInitialContext() throws NamingException {
// if user don't use jclient/client container
// we can specify the InitialContextFactory to use
// But this is *not recommended*.
Hashtable<String, Object> env = new Hashtable<String, Object>();
env.put(Context.INITIAL_CONTEXT_FACTORY, getInitialContextFactory());
// Usually a simple new InitialContext() without any parameters is sufficent.
// return new InitialContext();
return new InitialContext(env);
}
/**
* Returns a configurable InitialContextFactory classname.<br/>
* Can be configured with the <code>easybeans.client.initial-context-factory</code> System property.
* @return Returns a configurable InitialContextFactory classname.
*/
private static String getInitialContextFactory() {
String prop = System.getProperty("easybeans.client.initial-context-factory");
// If not found, use the default
if (prop == null) {
prop = DEFAULT_INITIAL_CONTEXT_FACTORY;
}
return prop;
}
}