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328 lines
12 KiB
C++
328 lines
12 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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#ifndef nsIServiceManager_h___
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#define nsIServiceManager_h___
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#include "nsIComponentManager.h"
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#include "nsID.h"
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class nsIShutdownListener;
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#define NS_ISERVICEMANAGER_IID \
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{ /* cf0df3b0-3401-11d2-8163-006008119d7a */ \
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0xcf0df3b0, \
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0x3401, \
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0x11d2, \
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{0x81, 0x63, 0x00, 0x60, 0x08, 0x11, 0x9d, 0x7a} \
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}
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/**
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* The nsIServiceManager manager interface provides a means to obtain
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* global services in an application. The service manager depends on the
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* repository to find and instantiate factories to obtain services.
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*
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* Users of the service manager must first obtain a pointer to the global
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* service manager by calling NS_GetGlobalServiceManager. After that,
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* they can request specific services by calling GetService. When they are
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* finished with a service the release it by calling ReleaseService (instead
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* of releasing the service object directly):
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*
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* nsICacheManager* cm;
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* nsServiceManager::GetService(kCacheManagerCID, kICacheManagerIID, (nsISupports**)&cm);
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*
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* ... use cm, and then sometime later ...
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*
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* nsServiceManager::ReleaseService(kCacheManagerCID, cm);
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*
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* A user of a service may keep references to particular services indefinitely
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* and only must call ReleaseService when it shuts down. However if the user
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* wishes to voluntarily cooperate with the shutdown of the service it is
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* using, it may supply an nsIShutdownListener to provide for asynchronous
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* release of the services it is using. The shutdown listener's OnShutdown
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* method will be called for a service that is being shut down, and it is
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* its responsiblity to release references obtained from that service if at
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* all possible.
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*
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* The process of shutting down a particular service is initiated by calling
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* the service manager's ShutdownService method. This will iterate through
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* all the registered shutdown listeners for the service being shut down, and
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* then will attempt to unload the library associated with the service if
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* possible. The status result of ShutdownService indicates whether the
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* service was successfully shut down, failed, or was not in service.
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*
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* XXX QUESTIONS:
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* - Should a "service" be more than nsISupports? Should it be a factory
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* and/or have Startup(), Shutdown(), etc.
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* - If the asynchronous OnShutdown operation gets called, does the user
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* of a service still need to call ReleaseService? (Or should they _not_
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* call it?)
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*/
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class nsIServiceManager : public nsISupports {
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public:
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NS_DEFINE_STATIC_IID_ACCESSOR(NS_ISERVICEMANAGER_IID);
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/**
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* RegisterService may be called explicitly to register a service
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* with the service manager. If a service is not registered explicitly,
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* the component manager will be used to create an instance according
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* to the class ID specified.
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*/
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NS_IMETHOD
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RegisterService(const nsCID& aClass, nsISupports* aService) = 0;
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/**
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* Requests a service to be shut down, possibly unloading its DLL.
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*
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* @returns NS_OK - if shutdown was successful and service was unloaded,
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* @returns NS_ERROR_SERVICE_NOT_FOUND - if shutdown failed because
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* the service was not currently loaded
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* @returns NS_ERROR_SERVICE_IN_USE - if shutdown failed because some
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* user of the service wouldn't voluntarily release it by using
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* a shutdown listener.
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*/
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NS_IMETHOD
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UnregisterService(const nsCID& aClass) = 0;
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NS_IMETHOD
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GetService(const nsCID& aClass, const nsIID& aIID,
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nsISupports* *result,
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nsIShutdownListener* shutdownListener = NULL) = 0;
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NS_IMETHOD
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ReleaseService(const nsCID& aClass, nsISupports* service,
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nsIShutdownListener* shutdownListener = NULL) = 0;
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////////////////////////////////////////////////////////////////////////////
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// let's do it again, this time with ProgIDs...
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NS_IMETHOD
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RegisterService(const char* aProgID, nsISupports* aService) = 0;
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NS_IMETHOD
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UnregisterService(const char* aProgID) = 0;
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NS_IMETHOD
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GetService(const char* aProgID, const nsIID& aIID,
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nsISupports* *result,
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nsIShutdownListener* shutdownListener = NULL) = 0;
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NS_IMETHOD
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ReleaseService(const char* aProgID, nsISupports* service,
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nsIShutdownListener* shutdownListener = NULL) = 0;
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};
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#define NS_ERROR_SERVICE_NOT_FOUND NS_ERROR_GENERATE_SUCCESS(NS_ERROR_MODULE_XPCOM, 22)
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#define NS_ERROR_SERVICE_IN_USE NS_ERROR_GENERATE_SUCCESS(NS_ERROR_MODULE_XPCOM, 23)
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////////////////////////////////////////////////////////////////////////////////
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#define NS_ISHUTDOWNLISTENER_IID \
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{ /* 56decae0-3406-11d2-8163-006008119d7a */ \
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0x56decae0, \
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0x3406, \
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0x11d2, \
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{0x81, 0x63, 0x00, 0x60, 0x08, 0x11, 0x9d, 0x7a} \
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}
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class nsIShutdownListener : public nsISupports {
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public:
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NS_DEFINE_STATIC_IID_ACCESSOR(NS_ISHUTDOWNLISTENER_IID);
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NS_IMETHOD
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OnShutdown(const nsCID& aClass, nsISupports* service) = 0;
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};
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////////////////////////////////////////////////////////////////////////////////
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// Interface to Global Services
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class NS_COM nsServiceManager {
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public:
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static nsresult
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RegisterService(const nsCID& aClass, nsISupports* aService);
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static nsresult
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UnregisterService(const nsCID& aClass);
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static nsresult
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GetService(const nsCID& aClass, const nsIID& aIID,
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nsISupports* *result,
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nsIShutdownListener* shutdownListener = NULL);
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static nsresult
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ReleaseService(const nsCID& aClass, nsISupports* service,
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nsIShutdownListener* shutdownListener = NULL);
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////////////////////////////////////////////////////////////////////////////
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// let's do it again, this time with ProgIDs...
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static nsresult
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RegisterService(const char* aProgID, nsISupports* aService);
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static nsresult
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UnregisterService(const char* aProgID);
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static nsresult
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GetService(const char* aProgID, const nsIID& aIID,
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nsISupports* *result,
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nsIShutdownListener* shutdownListener = NULL);
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static nsresult
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ReleaseService(const char* aProgID, nsISupports* service,
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nsIShutdownListener* shutdownListener = NULL);
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////////////////////////////////////////////////////////////////////////////
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static nsresult GetGlobalServiceManager(nsIServiceManager* *result);
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// This method can be called when shutting down the application. It
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// releases all the global services, and deletes the global service manager.
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static nsresult ShutdownGlobalServiceManager(nsIServiceManager* *result);
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static nsIServiceManager* mGlobalServiceManager;
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};
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////////////////////////////////////////////////////////////////////////////////
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// NS_WITH_SERVICE: macro to make using services easier.
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// Now you can replace this:
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// {
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// nsIMyService* service;
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// rv = nsServiceManager::GetService(kMyServiceCID, nsIMyService::GetIID(),
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// &service);
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// if (NS_FAILED(rv)) return rv;
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// service->Doit(...); // use my service
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// rv = nsServiceManager::ReleaseService(kMyServiceCID, service);
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// }
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// with this:
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// {
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// NS_WITH_SERVICE(nsIMyService, service, kMyServiceCID, &rv);
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// if (NS_FAILED(rv)) return rv;
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// service->Doit(...); // use my service
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// }
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// and the automatic destructor will take care of releasing the service.
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//
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// Note that this macro requires you to link with the xpcom DLL to pick up the
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// static member functions from nsServiceManager. For situations where you're
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// passed an nsISupports that is an nsIComponentManager (such as in a DLL's
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// NSRegisterSelf or NSUnregisterSelf entry points) you can use the following
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// macro instead:
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//
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// NSRegisterSelf(nsISupports* servMgr, const char* path) {
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// NS_WITH_SERVICE1(nsIComponentManager, compMgr, servMgr,
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// kComponentManagerCID, &rv);
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// if (NS_FAILED(rv)) return rv;
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// compMgr->RegisterComponent(...); // use the service
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// }
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#define NS_WITH_SERVICE(T, var, cid, rvAddr) \
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nsService _serv##var(cid, T::GetIID(), rvAddr); \
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T* var = (T*)(nsISupports*)_serv##var;
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#define NS_WITH_SERVICE1(T, var, isupports, cid, rvAddr) \
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nsService _serv##var(isupports, cid, T::GetIID(), rvAddr); \
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T* var = (T*)(nsISupports*)_serv##var;
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class nsService {
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protected:
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nsCID mCID;
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nsISupports* mService;
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public:
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nsService(nsISupports* aServMgr, const nsCID& aClass, const nsIID& aIID, nsresult *rv)
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: mCID(aClass), mService(0)
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{
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nsIServiceManager* servMgr;
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*rv = aServMgr->QueryInterface(nsIServiceManager::GetIID(), (void**)&servMgr);
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if (NS_SUCCEEDED(*rv)) {
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*rv = servMgr->GetService(mCID, aIID, &mService);
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NS_RELEASE(servMgr);
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}
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NS_ASSERTION(NS_SUCCEEDED(*rv), "Couldn't get service.");
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}
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nsService(nsISupports* aServMgr, const char* aProgID, const nsIID& aIID, nsresult *rv)
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: mService(0)
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{
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*rv = nsComponentManager::ProgIDToCLSID(aProgID, &mCID);
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NS_ASSERTION(NS_SUCCEEDED(*rv), "Couldn't get CLSID.");
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if (NS_FAILED(*rv)) return;
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nsIServiceManager* servMgr;
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*rv = aServMgr->QueryInterface(nsIServiceManager::GetIID(), (void**)&servMgr);
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if (NS_SUCCEEDED(*rv)) {
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*rv = servMgr->GetService(mCID, aIID, &mService);
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NS_RELEASE(servMgr);
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}
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NS_ASSERTION(NS_SUCCEEDED(*rv), "Couldn't get service.");
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}
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nsService(const nsCID& aClass, const nsIID& aIID, nsresult *rv)
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: mCID(aClass), mService(0) {
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*rv = nsServiceManager::GetService(aClass, aIID,
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(nsISupports**)&mService);
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NS_ASSERTION(NS_SUCCEEDED(*rv), "Couldn't get service.");
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}
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~nsService() {
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if (mService) { // mService could be null if the constructor fails
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nsresult rv = NS_OK;
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rv = nsServiceManager::ReleaseService(mCID, mService);
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NS_ASSERTION(NS_SUCCEEDED(rv), "Couldn't release service.");
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}
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}
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nsISupports* operator->() const {
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NS_PRECONDITION(mService != 0, "Your code should test the error result from the constructor.");
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return mService;
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}
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PRBool operator==(const nsISupports* other) {
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return mService == other;
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}
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operator nsISupports*() const {
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return mService;
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}
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};
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////////////////////////////////////////////////////////////////////////////////
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// NS_NewServiceManager: For when you want to create a service manager
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// in a given context.
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extern NS_COM nsresult
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NS_NewServiceManager(nsIServiceManager* *result);
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////////////////////////////////////////////////////////////////////////////////
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// Initialization of XPCOM. Creates the global ComponentManager, ServiceManager
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// and registers xpcom components with the ComponentManager. Should be called
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// before any call can be made to XPCOM. Currently we are coping with this
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// not being called and internally initializing XPCOM if not already.
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extern NS_COM nsresult
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NS_InitXPCOM(nsIServiceManager* *result);
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////////////////////////////////////////////////////////////////////////////////
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#endif /* nsIServiceManager_h___ */
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