winamp/Src/nu/Singleton.h

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2024-09-24 13:54:57 +01:00
#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