ObserverTypes.h

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#pragma once
#include "AggregateNotificationObserver.h"
#include "EntityObserver.h"
#include "FunctionalNotificationObserver.h"
#include <memory>
 
namespace catapult { namespace observers {
 
    using NotificationObserver = NotificationObserverT<model::Notification>;
 
    template<typename TNotification>
    using NotificationObserverPointerT = std::unique_ptr<const NotificationObserverT<TNotification>>;
 
    using AggregateNotificationObserver = AggregateNotificationObserverT<model::Notification>;
 
    template<typename TNotification>
    using AggregateNotificationObserverPointerT = std::unique_ptr<const AggregateNotificationObserverT<TNotification>>;
 
#define DECLARE_OBSERVER(NAME, NOTIFICATION_TYPE) observers::NotificationObserverPointerT<NOTIFICATION_TYPE> Create##NAME##Observer
 
#define MAKE_OBSERVER(NAME, NOTIFICATION_TYPE, HANDLER) \
    std::make_unique<observers::FunctionalNotificationObserverT<NOTIFICATION_TYPE>>(#NAME "Observer", HANDLER);
 
#define DEFINE_OBSERVER(NAME, NOTIFICATION_TYPE, HANDLER) \
    DECLARE_OBSERVER(NAME, NOTIFICATION_TYPE)() { \
        return MAKE_OBSERVER(NAME, NOTIFICATION_TYPE, HANDLER); \
    }
}}