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Glacier2.SessionHelper Maven / Gradle / Ivy
//
// Copyright (c) ZeroC, Inc. All rights reserved.
//
package Glacier2;
/**
* A helper class for using Glacier2 with GUI applications.
*/
public class SessionHelper
{
SessionHelper(SessionCallback callback, Ice.InitializationData initData, String finderStr,
boolean useCallbacks)
{
_callback = callback;
_initData = initData;
_finderStr = finderStr;
_useCallbacks = useCallbacks;
}
/**
* Destroys the Glacier2 session.
*
* Once the session has been destroyed, {@link SessionCallback#disconnected} is called on
* the associated callback object.
*/
public void
destroy()
{
synchronized(this)
{
if(_destroy)
{
return;
}
_destroy = true;
if(!_connected)
{
//
// In this case a connecting session is being destroyed.
// We destroy the communicator to trigger the immediate
// failure of the connection establishment.
//
new Thread(new Runnable()
{
@Override
public void run()
{
destroyCommunicator();
}
}).start();
return;
}
_session = null;
_connected = false;
try
{
Runtime.getRuntime().removeShutdownHook(_shutdownHook);
}
catch(IllegalStateException ex)
{
// Ignore
}
catch(SecurityException ex)
{
// Ignore
}
}
//
// Run destroyInternal in a thread because it makes remote invocations.
//
new Thread(new Runnable()
{
@Override
public void run()
{
destroyInternal();
}
}).start();
}
/**
* Returns the session's communicator object.
* @return The communicator.
*/
synchronized public Ice.Communicator
communicator()
{
return _communicator;
}
/**
* Returns the category to be used in the identities of all of the client's
* callback objects. Clients must use this category for the router to
* forward callback requests to the intended client.
* @return The category.
* @throws SessionNotExistException No session exists.
**/
synchronized public String
categoryForClient()
throws SessionNotExistException
{
if(_router == null)
{
throw new SessionNotExistException();
}
return _category;
}
/**
* Adds a servant to the callback object adapter's Active Servant Map with a UUID.
* @param servant The servant to add.
* @return The proxy for the servant.
* @throws SessionNotExistException No session exists.
**/
synchronized public Ice.ObjectPrx
addWithUUID(Ice.Object servant)
throws SessionNotExistException
{
if(_router == null)
{
throw new SessionNotExistException();
}
return internalObjectAdapter().add(servant, new Ice.Identity(java.util.UUID.randomUUID().toString(),
_category));
}
/**
* Returns the Glacier2 session proxy, or null if the session hasn't been established yet
* or the session has already been destroyed.
* @return The session proxy, or null if no session exists.
*/
synchronized public SessionPrx
session()
{
return _session;
}
/**
* Returns true if there is an active session, otherwise returns false.
* @return trueif session exists or false if no session exists.
*/
synchronized public boolean
isConnected()
{
return _connected;
}
/**
* Creates an object adapter for callback objects.
* @return The object adapter.
* @throws SessionNotExistException No session exists.
*/
synchronized public Ice.ObjectAdapter
objectAdapter()
throws SessionNotExistException
{
return internalObjectAdapter();
}
//
// Only call this method when the calling thread owns the lock
//
private Ice.ObjectAdapter
internalObjectAdapter()
throws SessionNotExistException
{
if(_router == null)
{
throw new SessionNotExistException();
}
if(!_useCallbacks)
{
throw new Ice.InitializationException(
"Object adapter not available, call SessionFactoryHelper.setUseCallbacks(true)");
}
return _adapter;
}
private interface ConnectStrategy
{
SessionPrx
connect(RouterPrx router)
throws CannotCreateSessionException, PermissionDeniedException;
}
synchronized protected void
connect(final java.util.Map context)
{
connectImpl(new ConnectStrategy()
{
@Override
public SessionPrx connect(RouterPrx router)
throws CannotCreateSessionException, PermissionDeniedException
{
return router.createSessionFromSecureConnection(context);
}
});
}
synchronized protected void
connect(final String username, final String password, final java.util.Map context)
{
connectImpl(new ConnectStrategy()
{
@Override
public SessionPrx connect(RouterPrx router)
throws CannotCreateSessionException, PermissionDeniedException
{
return router.createSession(username, password, context);
}
});
}
private void
connected(RouterPrx router, SessionPrx session)
{
//
// Remote invocation should be done without acquiring a mutex lock.
//
assert(router != null);
Ice.Connection conn = router.ice_getCachedConnection();
String category = router.getCategoryForClient();
int acmTimeout = 0;
try
{
acmTimeout = router.getACMTimeout();
}
catch(Ice.OperationNotExistException ex)
{
}
if(acmTimeout <= 0)
{
acmTimeout = (int)router.getSessionTimeout();
}
//
// We create the callback object adapter here because createObjectAdapter internally
// makes synchronous RPCs to the router. We can't create the OA on-demand when the
// client calls objectAdapter() or addWithUUID() because they can be called from the
// GUI thread.
//
if(_useCallbacks)
{
assert(_adapter == null);
_adapter = _communicator.createObjectAdapterWithRouter("", router);
_adapter.activate();
}
synchronized(this)
{
_router = router;
if(_destroy)
{
//
// Run destroyInternal in a thread because it makes remote invocations.
//
new Thread(new Runnable()
{
@Override
public void run()
{
destroyInternal();
}
}).start();
return;
}
//
// Cache the category.
//
_category = category;
//
// Assign the session after _destroy is checked.
//
_session = session;
_connected = true;
if(acmTimeout > 0)
{
Ice.Connection connection = _router.ice_getCachedConnection();
assert(connection != null);
connection.setACM(new Ice.IntOptional(acmTimeout),
null,
new Ice.Optional(Ice.ACMHeartbeat.HeartbeatAlways));
connection.setCloseCallback(new Ice.CloseCallback()
{
@Override
public void closed(Ice.Connection con)
{
destroy();
}
});
}
_shutdownHook = new Thread("Shutdown hook")
{
@Override
public void run()
{
SessionHelper.this.destroy();
}
};
try
{
Runtime.getRuntime().addShutdownHook(_shutdownHook);
}
catch(IllegalStateException e)
{
//
// Shutdown in progress, ignored
//
}
catch(SecurityException ex)
{
//
// Ignore. Unsigned applets cannot registered shutdown hooks.
//
}
}
dispatchCallback(new Runnable()
{
@Override
public void run()
{
try
{
_callback.connected(SessionHelper.this);
}
catch(SessionNotExistException ex)
{
SessionHelper.this.destroy();
}
}
}, conn);
}
private void
destroyInternal()
{
assert _destroy;
RouterPrx router = null;
Ice.Communicator communicator = null;
synchronized(this)
{
if(_router == null)
{
return;
}
router = _router;
_router = null;
communicator = _communicator;
}
assert communicator != null;
try
{
router.destroySession();
}
catch(Ice.ConnectionLostException e)
{
//
// Expected if another thread invoked on an object from the session concurrently.
//
}
catch(SessionNotExistException e)
{
//
// This can also occur.
//
}
catch(Throwable e)
{
//
// Not expected.
//
communicator.getLogger().warning("SessionHelper: unexpected exception when destroying the session:\n" + e);
}
communicator.destroy();
//
// Notify the callback that the session is gone.
//
dispatchCallback(new Runnable()
{
@Override
public void run()
{
_callback.disconnected(SessionHelper.this);
}
}, null);
}
private void
destroyCommunicator()
{
Ice.Communicator communicator = null;
synchronized(this)
{
communicator = _communicator;
}
if(communicator != null)
{
communicator.destroy();
}
}
private void
connectImpl(final ConnectStrategy factory)
{
assert !_destroy;
new Thread(new Runnable()
{
@Override
public void run()
{
try
{
synchronized(SessionHelper.this)
{
_communicator = Ice.Util.initialize(_initData);
}
}
catch(final Ice.LocalException ex)
{
synchronized(SessionHelper.this)
{
_destroy = true;
}
dispatchCallback(new Runnable()
{
@Override
public void run()
{
_callback.connectFailed(SessionHelper.this, ex);
}
}, null);
return;
}
if(_communicator.getDefaultRouter() == null)
{
final Ice.RouterFinderPrx finder =
Ice.RouterFinderPrxHelper.uncheckedCast(_communicator.stringToProxy(_finderStr));
try
{
_communicator.setDefaultRouter(finder.getRouter());
}
catch(final Ice.CommunicatorDestroyedException ex)
{
dispatchCallback(new Runnable()
{
@Override
public void run()
{
_callback.connectFailed(SessionHelper.this, ex);
}
}, null);
return;
}
catch(Exception ex)
{
//
// In case of error getting router identity from RouterFinder use
// default identity.
//
Ice.Identity ident = new Ice.Identity("router", "Glacier2");
_communicator.setDefaultRouter(Ice.RouterPrxHelper.uncheckedCast(finder.ice_identity(ident)));
}
}
try
{
dispatchCallbackAndWait(new Runnable()
{
@Override
public void run()
{
_callback.createdCommunicator(SessionHelper.this);
}
});
RouterPrx routerPrx = RouterPrxHelper.uncheckedCast(_communicator.getDefaultRouter());
SessionPrx session = factory.connect(routerPrx);
connected(routerPrx, session);
}
catch(final Exception ex)
{
_communicator.destroy();
dispatchCallback(new Runnable()
{
@Override
public void run()
{
_callback.connectFailed(SessionHelper.this, ex);
}
}, null);
}
}
}).start();
}
private void
dispatchCallback(Runnable runnable, Ice.Connection conn)
{
if(_initData.dispatcher != null)
{
_initData.dispatcher.dispatch(runnable, conn);
}
else
{
runnable.run();
}
}
private void
dispatchCallbackAndWait(final Runnable runnable)
{
if(_initData.dispatcher != null)
{
final java.util.concurrent.Semaphore sem = new java.util.concurrent.Semaphore(0);
_initData.dispatcher.dispatch(
new Runnable()
{
@Override
public void
run()
{
runnable.run();
sem.release();
}
}, null);
sem.acquireUninterruptibly();
}
else
{
runnable.run();
}
}
private final Ice.InitializationData _initData;
private Ice.Communicator _communicator;
private Ice.ObjectAdapter _adapter;
private RouterPrx _router;
private SessionPrx _session;
private String _category;
private String _finderStr;
private boolean _useCallbacks;
private final SessionCallback _callback;
private boolean _destroy = false;
private boolean _connected = false;
private Thread _shutdownHook;
}
