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152 lines
5.7 KiB
C++
152 lines
5.7 KiB
C++
/* -*- Mode: C++; tab-width: 3; indent-tabs-mode: nil; c-basic-offset: 3 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: NPL 1.1/GPL 2.0/LGPL 2.1
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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 1.1 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Pierre Phaneuf <pp@ludusdesign.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the NPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the NPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef __nsProxiedServiceManager_h_
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#define __nsProxiedServiceManager_h_
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#include "nsIServiceManager.h"
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#include "nsIProxyObjectManager.h"
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////////////////////////////////////////////////////////////////////////////////
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// NS_WITH_PROXIED_SERVICE: macro to make using services that need to be proxied
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// before using them easier.
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// Now you can replace this:
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// {
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// nsresult rv;
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// nsCOMPtr<nsIMyService> pIMyService =
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// do_GetService(kMyServiceCID, &rv);
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// if(NS_FAILED(rv))
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// return;
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// nsCOMPtr<nsIProxyObjectManager> pIProxyObjectManager =
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// do_GetService(kProxyObjectManagerCID, &rv);
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// if(NS_FAILED(rv))
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// return;
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// nsIMyService pIProxiedObject = NULL;
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// rv = pIProxyObjectManager->GetProxyForObject(pIProxyQueue,
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// NS_GET_IID(nsIMyService),
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// pIMyService, PROXY_SYNC,
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// (void**)&pIProxiedObject);
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// pIProxiedObject->DoIt(...); // Executed on same thread as pIProxyQueue
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// ...
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// pIProxiedObject->Release(); // Must be done as not managed for you.
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// }
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// with this:
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// {
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// nsresult rv;
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// NS_WITH_PROXIED_SERVICE(nsIMyService, pIMyService, kMyServiceCID,
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// pIProxyQueue, &rv);
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// if(NS_FAILED(rv))
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// return;
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// pIMyService->DoIt(...); // Executed on the same thread as pIProxyQueue
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// }
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// and the automatic destructor will take care of releasing the service and
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// the proxied object for you.
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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.
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#define NS_WITH_PROXIED_SERVICE(T, var, cid, Q, rvAddr) \
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nsProxiedService _serv##var(cid, NS_GET_IID(T), Q, PR_FALSE, rvAddr); \
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T* var = (T*)(nsISupports*)_serv##var;
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#define NS_WITH_ALWAYS_PROXIED_SERVICE(T, var, cid, Q, rvAddr) \
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nsProxiedService _serv##var(cid, NS_GET_IID(T), Q, PR_TRUE, rvAddr); \
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T* var = (T*)(nsISupports*)_serv##var;
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////////////////////////////////////////////////////////////////////////////////
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// nsProxiedService
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////////////////////////////////////////////////////////////////////////////////
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class nsProxiedService
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{
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public:
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nsProxiedService(const nsCID &aClass, const nsIID &aIID,
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nsIEventQueue* pIProxyQueue, PRBool always, nsresult*rv)
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{
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static NS_DEFINE_CID(kProxyObjectManagerCID, NS_PROXYEVENT_MANAGER_CID);
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*rv = nsServiceManager::GetService(aClass,
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aIID,
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getter_AddRefs(mService));
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if (NS_FAILED(*rv)) return;
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nsCOMPtr<nsIProxyObjectManager> pIProxyObjectManager =
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do_GetService(kProxyObjectManagerCID, rv);
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if (NS_FAILED(*rv)) return;
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PRInt32 proxyType = PROXY_SYNC;
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if (always) proxyType |= PROXY_ALWAYS;
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*rv = pIProxyObjectManager->GetProxyForObject(pIProxyQueue,
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aIID,
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mService,
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proxyType,
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getter_AddRefs(mProxiedService));
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}
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~nsProxiedService()
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{
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}
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nsISupports* operator->() const
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{
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NS_PRECONDITION(mProxiedService != 0, "Your code should test the error result from the constructor.");
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return mProxiedService;
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}
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PRBool operator==(const nsISupports* other)
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{
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return ((mProxiedService == other) || (mService == other));
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}
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operator nsISupports*() const
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{
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return mProxiedService;
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}
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protected:
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nsCOMPtr<nsISupports> mProxiedService;
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nsCOMPtr<nsISupports> mService;
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};
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#endif //__nsProxiedServiceManager_h_
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