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Allow event providers to know when a listener subs or unsubs.

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This commit is contained in:
Peter Powell 2019-10-19 17:26:30 +01:00
parent 274f40653f
commit 318b40dd70
1 changed files with 29 additions and 3 deletions
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32
include/event.h
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@ -57,7 +57,23 @@ class Events::ModuleEventProvider : public ServiceProvider, private dynamic_refe
*/
const SubscriberList& GetSubscribers() const { return prov->subscribers; }
friend class ModuleEventListener;
/** Subscribes a listener to this event.
* @param subscriber The listener to subscribe.
*/
void Subscribe(ModuleEventListener* subscriber)
{
subscribers.insert(subscriber);
OnSubscribe(subscriber);
}
/** Unsubscribes a listener from this event.
* @param subscriber The listener to unsubscribe.
*/
void Unsubscribe(ModuleEventListener* subscriber)
{
subscribers.erase(subscriber);
OnUnsubscribe(subscriber);
}
private:
void OnCapture() CXX11_OVERRIDE
@ -67,6 +83,16 @@ class Events::ModuleEventProvider : public ServiceProvider, private dynamic_refe
subscribers.clear();
}
/** Called when a listener subscribes to this event.
* @param subscriber The listener which subscribed.
*/
virtual void OnSubscribe(ModuleEventListener* subscriber) { }
/** Called when a listener unsubscribes from this event.
* @param subscriber The listener which unsubscribed.
*/
virtual void OnUnsubscribe(ModuleEventListener* subscriber) { }
/** Reference to the active provider for this event. In case multiple event providers
* exist for the same event, only one of them contains the list of subscribers.
* To handle the case when we are not the ones with the list, we get it from the provider
@ -95,7 +121,7 @@ class Events::ModuleEventListener : private dynamic_reference_base::CaptureHook
*/
void OnCapture() CXX11_OVERRIDE
{
prov->subscribers.insert(this);
prov->Subscribe(this);
}
public:
@ -119,7 +145,7 @@ class Events::ModuleEventListener : private dynamic_reference_base::CaptureHook
~ModuleEventListener()
{
if (prov)
prov->subscribers.erase(this);
prov->Unsubscribe(this);
}
/** Retrieves the module which created this listener. */