void flush() {
sendMessages();
if (disconnect) {
ClientSessionHandler handler = handlers.get(sessionRefId);
/*
* If session is local, disconnect session; otherwise, log
* error message.
*/
if (handler != null) {
handler.handleDisconnect(false);
} else {
logger.log(
Level.FINE, "discarding request to disconnect unknown session:{0}", sessionRefId);
}
}
}
/**
* Validates the {@code identity} of the user logging in and returns {@code true} if the login is
* allowed to proceed, and {@code false} if the login is denied.
*
* <p>A user with the specified {@code identity} is allowed to log in if one of the following
* conditions holds:
*
* <ul>
* <li>the {@code identity} is not currently logged in, or
* <li>the {@code identity} is logged in, and the {@code
* com.sun.sgs.impl.service.session.allow.new.login} property is set to {@code true}.
* </ul>
*
* In the latter case (new login allowed), the existing user session logged in with {@code
* identity} is forcibly disconnected.
*
* <p>If this method returns {@code true}, the {@link #removeUserLogin} method must be invoked
* when the user with the specified {@code identity} is disconnected.
*
* @param identity the user identity
* @param handler the client session handler
* @return {@code true} if the user is allowed to log in with the specified {@code identity},
* otherwise returns {@code false}
*/
boolean validateUserLogin(Identity identity, ClientSessionHandler handler) {
ClientSessionHandler previousHandler = loggedInIdentityMap.putIfAbsent(identity, handler);
if (previousHandler == null) {
// No user logged in with the same idenity; allow login.
return true;
} else if (!allowNewLogin) {
// Same user logged in; new login not allowed, so deny login.
return false;
} else if (!previousHandler.loginHandled()) {
// Same user logged in; can't preempt user in the
// process of logging in; deny login.
return false;
} else {
if (loggedInIdentityMap.replace(identity, previousHandler, handler)) {
// Disconnect current user; allow new login.
previousHandler.handleDisconnect(false, true);
return true;
} else {
// Another same user login beat this one; deny login.
return false;
}
}
}