mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-12-28 11:28:38 +00:00
261 lines
9.8 KiB
C++
261 lines
9.8 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
|
|
*
|
|
* The contents of this file are subject to the Netscape Public License
|
|
* Version 1.0 (the "NPL"); you may not use this file except in
|
|
* compliance with the NPL. You may obtain a copy of the NPL at
|
|
* http://www.mozilla.org/NPL/
|
|
*
|
|
* Software distributed under the NPL is distributed on an "AS IS" basis,
|
|
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
|
|
* for the specific language governing rights and limitations under the
|
|
* NPL.
|
|
*
|
|
* The Initial Developer of this code under the NPL is Netscape
|
|
* Communications Corporation. Portions created by Netscape are
|
|
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
|
|
* Reserved.
|
|
*/
|
|
|
|
#ifndef nsIServiceManager_h___
|
|
#define nsIServiceManager_h___
|
|
|
|
#include "nsISupports.h"
|
|
#include "nsID.h"
|
|
|
|
class nsIShutdownListener;
|
|
|
|
#define NS_ISERVICEMANAGER_IID \
|
|
{ /* cf0df3b0-3401-11d2-8163-006008119d7a */ \
|
|
0xcf0df3b0, \
|
|
0x3401, \
|
|
0x11d2, \
|
|
{0x81, 0x63, 0x00, 0x60, 0x08, 0x11, 0x9d, 0x7a} \
|
|
}
|
|
|
|
/**
|
|
* The nsIServiceManager manager interface provides a means to obtain
|
|
* global services in an application. The service manager depends on the
|
|
* repository to find and instantiate factories to obtain services.
|
|
*
|
|
* Users of the service manager must first obtain a pointer to the global
|
|
* service manager by calling NS_GetGlobalServiceManager. After that,
|
|
* they can request specific services by calling GetService. When they are
|
|
* finished with a service the release it by calling ReleaseService (instead
|
|
* of releasing the service object directly):
|
|
*
|
|
* nsICacheManager* cm;
|
|
* nsServiceManager::GetService(kCacheManagerCID, kICacheManagerIID, (nsISupports**)&cm);
|
|
*
|
|
* ... use cm, and then sometime later ...
|
|
*
|
|
* nsServiceManager::ReleaseService(kCacheManagerCID, cm);
|
|
*
|
|
* A user of a service may keep references to particular services indefinitely
|
|
* and only must call ReleaseService when it shuts down. However if the user
|
|
* wishes to voluntarily cooperate with the shutdown of the service it is
|
|
* using, it may supply an nsIShutdownListener to provide for asynchronous
|
|
* release of the services it is using. The shutdown listener's OnShutdown
|
|
* method will be called for a service that is being shut down, and it is
|
|
* its responsiblity to release references obtained from that service if at
|
|
* all possible.
|
|
*
|
|
* The process of shutting down a particular service is initiated by calling
|
|
* the service manager's ShutdownService method. This will iterate through
|
|
* all the registered shutdown listeners for the service being shut down, and
|
|
* then will attempt to unload the library associated with the service if
|
|
* possible. The status result of ShutdownService indicates whether the
|
|
* service was successfully shut down, failed, or was not in service.
|
|
*
|
|
* XXX QUESTIONS:
|
|
* - Should a "service" be more than nsISupports? Should it be a factory
|
|
* and/or have Startup(), Shutdown(), etc.
|
|
* - If the asynchronous OnShutdown operation gets called, does the user
|
|
* of a service still need to call ReleaseService? (Or should they _not_
|
|
* call it?)
|
|
*/
|
|
class nsIServiceManager : public nsISupports {
|
|
public:
|
|
|
|
NS_DEFINE_STATIC_IID_ACCESSOR(NS_ISERVICEMANAGER_IID);
|
|
|
|
/**
|
|
* RegisterService may be called explicitly to register a service
|
|
* with the service manager. If a service is not registered explicitly,
|
|
* the component manager will be used to create an instance according
|
|
* to the class ID specified.
|
|
*/
|
|
NS_IMETHOD
|
|
RegisterService(const nsCID& aClass, nsISupports* aService) = 0;
|
|
|
|
/**
|
|
* Requests a service to be shut down, possibly unloading its DLL.
|
|
*
|
|
* @returns NS_OK - if shutdown was successful and service was unloaded,
|
|
* @returns NS_ERROR_SERVICE_NOT_FOUND - if shutdown failed because
|
|
* the service was not currently loaded
|
|
* @returns NS_ERROR_SERVICE_IN_USE - if shutdown failed because some
|
|
* user of the service wouldn't voluntarily release it by using
|
|
* a shutdown listener.
|
|
*/
|
|
NS_IMETHOD
|
|
UnregisterService(const nsCID& aClass) = 0;
|
|
|
|
NS_IMETHOD
|
|
GetService(const nsCID& aClass, const nsIID& aIID,
|
|
nsISupports* *result,
|
|
nsIShutdownListener* shutdownListener = NULL) = 0;
|
|
|
|
NS_IMETHOD
|
|
ReleaseService(const nsCID& aClass, nsISupports* service,
|
|
nsIShutdownListener* shutdownListener = NULL) = 0;
|
|
|
|
};
|
|
|
|
#define NS_ERROR_SERVICE_NOT_FOUND NS_ERROR_GENERATE_SUCCESS(NS_ERROR_MODULE_XPCOM, 22)
|
|
#define NS_ERROR_SERVICE_IN_USE NS_ERROR_GENERATE_SUCCESS(NS_ERROR_MODULE_XPCOM, 23)
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// nsService: Template to make using services easier. Now you can replace this:
|
|
//
|
|
// nsIMyService* service;
|
|
// rv = nsServiceManager::GetService(cid, iid, &service);
|
|
// if (NS_SUCCEEDED(rv)) {
|
|
// service->Doit(...); // use my service
|
|
// rv = nsServiceManager::ReleaseService(cid, service);
|
|
// }
|
|
//
|
|
// with this:
|
|
//
|
|
// nsService<nsIMyService> service(cid, &rv);
|
|
// if (NS_SUCCEEDED(rv)) {
|
|
// service->Doit(...); // use my service
|
|
// }
|
|
//
|
|
// and the automatic destructor will take care of releasing the service.
|
|
|
|
#ifdef XP_WIN
|
|
|
|
template<class T> class nsService {
|
|
protected:
|
|
const nsCID mCID;
|
|
T* mService;
|
|
|
|
public:
|
|
nsService(nsISupports* aServMgr, const nsCID& aClass, nsresult *rv)
|
|
: mCID(aClass), mService(0) {
|
|
|
|
nsIServiceManager* servMgr;
|
|
*rv = aServMgr->QueryInterface(nsIServiceManager::GetIID(), (void**)&servMgr);
|
|
if (NS_SUCCEEDED(*rv)) {
|
|
*rv = servMgr->GetService(aClass, T::GetIID(), (nsISupports**)&mService);
|
|
NS_RELEASE(servMgr);
|
|
}
|
|
NS_ASSERTION(NS_SUCCEEDED(*rv), "Couldn't get service.");
|
|
}
|
|
|
|
nsService(const nsCID& aClass, nsresult *rv)
|
|
: mCID(aClass), mService(0) {
|
|
*rv = nsServiceManager::GetService(aClass, T::GetIID(),
|
|
(nsISupports**)&mService);
|
|
NS_ASSERTION(NS_SUCCEEDED(*rv), "Couldn't get service.");
|
|
}
|
|
|
|
~nsService() {
|
|
if (mService) { // mService could be null if the constructor fails
|
|
nsresult rv = nsServiceManager::ReleaseService(mCID, mService);
|
|
NS_ASSERTION(NS_SUCCEEDED(rv), "Couldn't release service.");
|
|
}
|
|
}
|
|
|
|
T* operator->() const {
|
|
NS_PRECONDITION(mService != 0, "Your code should test the error result from the constructor.");
|
|
return mService;
|
|
}
|
|
|
|
PRBool operator==(const T* other) {
|
|
return mService == other;
|
|
}
|
|
|
|
operator T*() const {
|
|
return mService;
|
|
}
|
|
|
|
};
|
|
|
|
#else
|
|
|
|
#define NS_WITH_SERVICE(T, serv, isupports, cid, rv) \
|
|
{ \
|
|
T* serv; \
|
|
const nsCID& _aClass = (cid); \
|
|
nsISupports* _isupp = (isupports); \
|
|
nsIServiceManager* _servMgr; \
|
|
*(rv) = (_isupp)->QueryInterface(nsIServiceManager::GetIID(), (void**)&_servMgr); \
|
|
if (NS_SUCCEEDED(*rv)) { \
|
|
*(rv) = _servMgr->GetService(_aClass, T::GetIID(), (nsISupports**)&(serv)); \
|
|
NS_RELEASE(_servMgr); \
|
|
} \
|
|
|
|
#define NS_END_WITH_SERVICE(cid, serv) \
|
|
_servMgr->ReleaseService(cid, serv); \
|
|
} \
|
|
|
|
#endif
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
#define NS_ISHUTDOWNLISTENER_IID \
|
|
{ /* 56decae0-3406-11d2-8163-006008119d7a */ \
|
|
0x56decae0, \
|
|
0x3406, \
|
|
0x11d2, \
|
|
{0x81, 0x63, 0x00, 0x60, 0x08, 0x11, 0x9d, 0x7a} \
|
|
}
|
|
|
|
class nsIShutdownListener : public nsISupports {
|
|
public:
|
|
|
|
NS_DEFINE_STATIC_IID_ACCESSOR(NS_ISHUTDOWNLISTENER_IID);
|
|
|
|
NS_IMETHOD
|
|
OnShutdown(const nsCID& aClass, nsISupports* service) = 0;
|
|
|
|
};
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// Interface to Global Services
|
|
|
|
class NS_COM nsServiceManager {
|
|
public:
|
|
|
|
static nsresult RegisterService(const nsCID& aClass, nsISupports* aService);
|
|
|
|
static nsresult UnregisterService(const nsCID& aClass);
|
|
|
|
static nsresult GetService(const nsCID& aClass, const nsIID& aIID,
|
|
nsISupports* *result,
|
|
nsIShutdownListener* shutdownListener = NULL);
|
|
|
|
static nsresult ReleaseService(const nsCID& aClass, nsISupports* service,
|
|
nsIShutdownListener* shutdownListener = NULL);
|
|
|
|
// Since the global Service Manager is truly global, there's no need to
|
|
// release it.
|
|
static nsresult GetGlobalServiceManager(nsIServiceManager* *result);
|
|
|
|
protected:
|
|
static nsIServiceManager* mGlobalServiceManager;
|
|
|
|
};
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// NS_NewServiceManager: For when you want to create a service manager
|
|
// in a given context.
|
|
|
|
extern NS_COM nsresult
|
|
NS_NewServiceManager(nsIServiceManager* *result);
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
#endif /* nsIServiceManager_h___ */
|