Red Hat Application Server, Руководство пользователя

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76 Chapter 7. Developing Session Beans
// This is an example of Session Bean, stateful, and synchronized.
public class OpBean implements SessionBean, SessionSynchronization {
protected int total = 0; // actual state of the bean
protected int newtotal = 0; // value inside Tx, not yet committed.
protected String clientUser = null;
protected SessionContext sessionContext = null;
public void ejbCreate (String user) {
total = 0;
newtotal = total;
clientUser = user;
}
public void ejbActivate () {
// Nothing to do for this simple example
}
public void ejbPassivate () {
// Nothing to do for this simple example
}
public void ejbRemove () {
// Nothing to do for this simple example
}
public void setSessionContext (SessionContext sessionContext) {
this.sessionContext = sessionContext;
}
public void afterBegin () {
newtotal = total;
}
public void beforeCompletion () {
// We can access the bean environment everywhere in the bean,
// for example here!
try {
InitialContext ictx = new InitialContext();
String value = (String) ictx.lookup("java:comp/env/prop1");
// value should be the one defined in ejb-jar.xml
} catch (NamingException e) {
throw new EJBException(e);
}
}
public void afterCompletion (boolean committed) {
if (committed) {
total = newtotal;
} else {
newtotal = total;
}
}
public void buy (int s) {
newtotal = ne s;
return;
}
public int read () {