147 строки
5.7 KiB
C++
147 строки
5.7 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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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 "nsRepository.h"
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class nsIShutdownListener;
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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_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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* 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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ShutdownService(const nsCID& aClass) = 0;
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};
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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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#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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class nsIShutdownListener : public nsISupports {
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public:
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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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#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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////////////////////////////////////////////////////////////////////////////////
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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 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 ReleaseService(const nsCID& aClass, nsISupports* service,
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nsIShutdownListener* shutdownListener = NULL);
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static nsresult ShutdownService(const nsCID& aClass);
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protected:
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static nsresult GetGlobalServiceManager(nsIServiceManager* *result);
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static nsIServiceManager* globalServiceManager;
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};
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////////////////////////////////////////////////////////////////////////////////
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#endif /* nsIServiceManager_h___ */
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