Initial community commit

Src/nu/Singleton.h

@@ -0,0 +1,86 @@
+#pragma once
+#ifndef NULLSOFT_UTILITY_SINGLETON_H
+#define NULLSOFT_UTILITY_SINGLETON_H
+
+#include <api/service/waservicefactoryi.h>
+#include <api/service/services.h>
+
+/*
+====== Usage ======
+disp_t: your Dispatchable base class
+implt_t: your implementation class
+
+SingletonServiceFactory<disp_t, impl_t> myFactory;
+impl_t myImplementation;
+
+//....
+
+//during service registration
+myFactory.Register(WASABI_API_SVC, &myImplementation);
+
+//during service deregistration
+myFactory.Deregister(WASABI_API_SVC, &myImplementation);
+
+==== Class requirements ====
+your base or implementation class requires the following three static methods
+static FOURCC getServiceType(); // return your type (e.g. WaSvc::UNIQUE)... might already be defined in the dispatchable base class
+static const char *getServiceName(); // return your service name
+static GUID getServiceGuid(); // return your service GUID
+*/
+
+template <class disp_t, class impl_t>
+class SingletonServiceFactory : public waServiceFactory
+{
+public:
+	SingletonServiceFactory() : impl(0)
+	{
+	}
+
+	~SingletonServiceFactory()
+	{
+	}
+
+	void Register(api_service *serviceManager, impl_t *new_impl)
+	{
+		impl=new_impl;
+		serviceManager->service_register(this);
+	}
+
+	void Deregister(api_service *serviceManager)
+	{
+		if (impl)
+		{
+			serviceManager->service_deregister(this);
+			impl=0;
+		}
+	}
+
+private:
+	FOURCC svc_serviceType() { return impl_t::getServiceType(); } 
+	const char *svc_getServiceName() { return impl_t::getServiceName(); }
+	GUID svc_getGuid() { return impl_t::getServiceGuid(); } // GUID per service factory, can be INVALID_GUID
+	void *svc_getInterface(int global_lock = TRUE) { return static_cast<disp_t *>(impl); }
+	int svc_supportNonLockingGetInterface() { return 1; }
+	int svc_releaseInterface(void *ifc) 	{		return 0; 	}
+	const wchar_t *svc_getTestString() { return 0; }
+	int svc_notify(int msg, int param1 = 0, int param2 = 0) { return 0; }
+
+private:
+	impl_t *impl;
+
+protected:
+#define CBCLASS SingletonServiceFactory<disp_t, impl_t>
+	START_DISPATCH_INLINE;
+	CB(WASERVICEFACTORY_GETSERVICETYPE, svc_serviceType);
+	CB(WASERVICEFACTORY_GETSERVICENAME, svc_getServiceName);
+	CB(WASERVICEFACTORY_GETGUID, svc_getGuid);
+	CB(WASERVICEFACTORY_GETINTERFACE, svc_getInterface);
+	CB(WASERVICEFACTORY_SUPPORTNONLOCKINGGETINTERFACE, svc_supportNonLockingGetInterface);
+	CB(WASERVICEFACTORY_RELEASEINTERFACE, svc_releaseInterface);
+	CB(WASERVICEFACTORY_GETTESTSTRING, svc_getTestString);
+	CB(WASERVICEFACTORY_SERVICENOTIFY, svc_notify);
+	END_DISPATCH;
+#undef CBCLASS
+};
+
+#endif