void ObservableLooper::MessageReceived(
BMessage* message) {
// PRINT((
// "### ObservableLooper::MessageReceived()\n"));
// message->PrintToStream();
switch(message->what) {
case M_ADD_OBSERVER:
_handleAddObserver(message);
break;
case M_REMOVE_OBSERVER:
_handleRemoveObserver(message);
break;
case M_KILL_OBSERVABLE:
releaseComplete();
BLooper::Quit();
break;
default:
_inherited::MessageReceived(message);
}
}
void ObservableHandler::MessageReceived(
BMessage* message) {
// PRINT((
// "### ObservableHandler::MessageReceived()\n"));
// message->PrintToStream();
switch(message->what) {
case M_ADD_OBSERVER:
_handleAddObserver(message);
break;
case M_REMOVE_OBSERVER:
_handleRemoveObserver(message);
break;
case M_KILL_OBSERVABLE:
// +++++ this should be an optional feature
releaseComplete();
delete this; // BOOM!
break;
default:
_inherited::MessageReceived(message);
}
}
void ObservableLooper::Quit() {
ASSERT(IsLocked());
if(QuitRequested()) {
releaseComplete();
_inherited::Quit();
}
else
Unlock();
}
void ObservableLooper::_handleRemoveObserver(
BMessage* message) {
// PRINT(("ObservableLooper::_handleRemoveObserver():\n"
// " %ld targets\n", CountTargets()));
BMessage reply;
BMessenger observer;
status_t err = message->FindMessenger(
"observer", &observer);
if(err < B_OK) {
PRINT((
"* ObservableLooper::_handleRemoveObserver(): no observer specified!\n"));
// send reply? +++++
return;
}
// at this point, a reply of some sort will be sent
reply.AddMessenger("target", BMessenger(this));
reply.AddMessenger("observer", observer);
int32 index = IndexOfTarget(observer.Target(0));
if(index == -1) {
reply.what = M_BAD_OBSERVER;
}
else {
RemoveTarget(index);
reply.what = M_OBSERVER_REMOVED;
}
message->SendReply(&reply);
// call hook
observerRemoved(observer);
// time to shut down?
if(m_quitting && !CountTargets()) {
releaseComplete();
BLooper::Quit();
}
}
void ObservableHandler::_handleRemoveObserver(
BMessage* message) {
#if DEBUG
BLooper* l = Looper();
ASSERT(l);
ASSERT(l->IsLocked());
#endif
BMessage reply;
BMessenger observer;
status_t err = message->FindMessenger(
"observer", &observer);
if(err < B_OK) {
PRINT((
"* ObservableHandler::_handleRemoveObserver(): no observer specified!\n"));
// send reply? +++++
return;
}
int32 index = IndexOfTarget(observer.Target(0));
if(index == -1) {
reply.what = M_BAD_OBSERVER;
reply.AddMessenger("target", BMessenger(this));
reply.AddMessenger("observer", observer);
message->SendReply(&reply);
return;
}
// valid observer given; remove it & call notification hook
RemoveTarget(index);
observerRemoved(observer);
// time to shut down?
if(m_released && !CountTargets()) {
releaseComplete();
delete this; // BOOM!
}
}
__USE_CORTEX_NAMESPACE
// ---------------------------------------------------------------- //
// *** deletion
// ---------------------------------------------------------------- //
// clients must call release() rather than deleting,
// to ensure that all observers are notified of the
// object's demise. if the object has already been
// released, return an error.
status_t ObservableHandler::release() {
if(m_released)
return B_NOT_ALLOWED;
// PRINT((
// "ObservableHandler::release(): %ld targets\n", CountTargets()));
if(!LockLooper()) {
ASSERT(!"failed to lock looper");
}
m_released = true;
if(CountTargets()) {
// notify
notifyRelease();
UnlockLooper();
}
else {
releaseComplete();
UnlockLooper();
delete this;
}
return B_OK;
}
