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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Pierre Phaneuf <pp@ludusdesign.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef __nsProxiedServiceManager_h_
#define __nsProxiedServiceManager_h_
#include "nsIServiceManager.h"
#include "nsIProxyObjectManager.h"
////////////////////////////////////////////////////////////////////////////////
// NS_WITH_PROXIED_SERVICE: macro to make using services that need to be proxied
// before using them easier.
// Now you can replace this:
// {
// nsresult rv;
// nsCOMPtr<nsIMyService> pIMyService =
// do_GetService(kMyServiceCID, &rv);
// if(NS_FAILED(rv))
// return;
// nsCOMPtr<nsIProxyObjectManager> pIProxyObjectManager =
// do_GetService(kProxyObjectManagerCID, &rv);
// if(NS_FAILED(rv))
// return;
// nsIMyService pIProxiedObject = NULL;
// rv = pIProxyObjectManager->GetProxyForObject(pIProxyQueue,
// NS_GET_IID(nsIMyService),
// pIMyService, PROXY_SYNC,
// (void**)&pIProxiedObject);
// pIProxiedObject->DoIt(...); // Executed on same thread as pIProxyQueue
// ...
// pIProxiedObject->Release(); // Must be done as not managed for you.
// }
// with this:
// {
// nsresult rv;
// NS_WITH_PROXIED_SERVICE(nsIMyService, pIMyService, kMyServiceCID,
// pIProxyQueue, &rv);
// if(NS_FAILED(rv))
// return;
// pIMyService->DoIt(...); // Executed on the same thread as pIProxyQueue
// }
// and the automatic destructor will take care of releasing the service and
// the proxied object for you.
//
// Note that this macro requires you to link with the xpcom DLL to pick up the
// static member functions from nsServiceManager.
#define NS_WITH_PROXIED_SERVICE(T, var, cid, Q, rvAddr) \
nsProxiedService _serv##var(cid, NS_GET_IID(T), Q, PR_FALSE, rvAddr); \
T* var = (T*)(nsISupports*)_serv##var;
#define NS_WITH_ALWAYS_PROXIED_SERVICE(T, var, cid, Q, rvAddr) \
nsProxiedService _serv##var(cid, NS_GET_IID(T), Q, PR_TRUE, rvAddr); \
T* var = (T*)(nsISupports*)_serv##var;
////////////////////////////////////////////////////////////////////////////////
// nsProxiedService
////////////////////////////////////////////////////////////////////////////////
class nsProxiedService
{
public:
nsProxiedService(const nsCID &aClass, const nsIID &aIID,
nsIEventQueue* pIProxyQueue, PRBool always, nsresult*rv)
{
*rv = nsServiceManager::GetService(aClass,
aIID,
getter_AddRefs(mService));
if (NS_FAILED(*rv)) return;
InitProxy(aIID, pIProxyQueue, always, rv);
}
nsProxiedService(const char* aContractID, const nsIID &aIID,
nsIEventQueue* pIProxyQueue, PRBool always, nsresult*rv)
{
*rv = nsServiceManager::GetService(aContractID,
aIID,
getter_AddRefs(mService));
if (NS_FAILED(*rv)) return;
InitProxy(aIID, pIProxyQueue, always, rv);
}
void InitProxy(const nsIID &aIID, nsIEventQueue* pIProxyQueue,
PRBool always, nsresult*rv)
{
static NS_DEFINE_CID(kProxyObjectManagerCID, NS_PROXYEVENT_MANAGER_CID);
nsCOMPtr<nsIProxyObjectManager> pIProxyObjectManager =
do_GetService(kProxyObjectManagerCID, rv);
if (NS_FAILED(*rv)) return;
PRInt32 proxyType = PROXY_SYNC;
if (always) proxyType |= PROXY_ALWAYS;
*rv = pIProxyObjectManager->GetProxyForObject(pIProxyQueue,
aIID,
mService,
proxyType,
getter_AddRefs(mProxiedService));
}
~nsProxiedService()
{
}
nsISupports* operator->() const
{
NS_PRECONDITION(mProxiedService != 0, "Your code should test the error result from the constructor.");
return mProxiedService;
}
PRBool operator==(const nsISupports* other)
{
return ((mProxiedService == other) || (mService == other));
}
operator nsISupports*() const
{
return mProxiedService;
}
protected:
nsCOMPtr<nsISupports> mProxiedService;
nsCOMPtr<nsISupports> mService;
};
#endif //__nsProxiedServiceManager_h_
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