mirror of
https://github.com/rn10950/RetroZilla.git
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254 lines
8.1 KiB
C++
254 lines
8.1 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 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 Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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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 of the GNU General Public License Version 2 or later (the "GPL"),
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* or 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 MPL, 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 MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "prlog.h"
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#include "prlock.h"
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#include "nsIFactory.h"
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#include "nsIServiceManager.h"
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#include "nsIComponentManager.h"
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#include "nsIObserverService.h"
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#include "nsObserverService.h"
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#include "nsObserverList.h"
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#include "nsHashtable.h"
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#include "nsIWeakReference.h"
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#define NS_WEAK_OBSERVERS
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#define NOTIFY_GLOBAL_OBSERVERS
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#if defined(PR_LOGGING)
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// Log module for nsObserverService logging...
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//
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// To enable logging (see prlog.h for full details):
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//
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// set NSPR_LOG_MODULES=ObserverService:5
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// set NSPR_LOG_FILE=nspr.log
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//
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// this enables PR_LOG_DEBUG level information and places all output in
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// the file nspr.log
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PRLogModuleInfo* observerServiceLog = nsnull;
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#endif /* PR_LOGGING */
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////////////////////////////////////////////////////////////////////////////////
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// nsObserverService Implementation
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NS_IMPL_THREADSAFE_ISUPPORTS1(nsObserverService, nsIObserverService)
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nsObserverService::nsObserverService()
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: mObserverTopicTable(nsnull)
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{
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}
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nsObserverService::~nsObserverService(void)
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{
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if(mObserverTopicTable)
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delete mObserverTopicTable;
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}
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NS_METHOD
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nsObserverService::Create(nsISupports* outer, const nsIID& aIID, void* *aInstancePtr)
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{
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#if defined(PR_LOGGING)
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if (!observerServiceLog)
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observerServiceLog = PR_NewLogModule("ObserverService");
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#endif
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nsresult rv;
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nsObserverService* os = new nsObserverService();
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if (os == nsnull)
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return NS_ERROR_OUT_OF_MEMORY;
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NS_ADDREF(os);
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rv = os->QueryInterface(aIID, aInstancePtr);
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NS_RELEASE(os);
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return rv;
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}
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static PRBool PR_CALLBACK
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ReleaseObserverList(nsHashKey *aKey, void *aData, void* closure)
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{
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nsObserverList* observerList = NS_STATIC_CAST(nsObserverList*, aData);
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delete(observerList);
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return PR_TRUE;
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}
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nsresult nsObserverService::GetObserverList(const char* aTopic, nsObserverList** anObserverList)
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{
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if (anObserverList == nsnull)
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return NS_ERROR_NULL_POINTER;
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if(mObserverTopicTable == nsnull)
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{
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mObserverTopicTable = new nsObjectHashtable(nsnull,
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nsnull, // should never be cloned
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ReleaseObserverList,
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nsnull,
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256,
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PR_TRUE);
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if (mObserverTopicTable == nsnull)
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return NS_ERROR_OUT_OF_MEMORY;
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}
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nsCStringKey key(aTopic);
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nsObserverList *topicObservers;
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topicObservers = (nsObserverList *) mObserverTopicTable->Get(&key);
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if (topicObservers)
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{
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*anObserverList = topicObservers;
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return NS_OK;
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}
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topicObservers = new nsObserverList();
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if (!topicObservers)
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return NS_ERROR_OUT_OF_MEMORY;
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*anObserverList = topicObservers;
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mObserverTopicTable->Put(&key, topicObservers);
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return NS_OK;
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}
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NS_IMETHODIMP nsObserverService::AddObserver(nsIObserver* anObserver, const char* aTopic, PRBool ownsWeak)
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{
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nsObserverList* anObserverList;
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nsresult rv;
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if (anObserver == nsnull || aTopic == nsnull)
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return NS_ERROR_NULL_POINTER;
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rv = GetObserverList(aTopic, &anObserverList);
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if (NS_FAILED(rv)) return rv;
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return anObserverList->AddObserver(anObserver, ownsWeak);
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}
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NS_IMETHODIMP nsObserverService::RemoveObserver(nsIObserver* anObserver, const char* aTopic)
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{
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nsObserverList* anObserverList;
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nsresult rv;
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if (anObserver == nsnull || aTopic == nsnull)
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return NS_ERROR_NULL_POINTER;
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rv = GetObserverList(aTopic, &anObserverList);
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if (NS_FAILED(rv)) return rv;
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return anObserverList->RemoveObserver(anObserver);
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}
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NS_IMETHODIMP nsObserverService::EnumerateObservers(const char* aTopic, nsISimpleEnumerator** anEnumerator)
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{
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nsObserverList* anObserverList;
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nsresult rv;
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if (anEnumerator == nsnull || aTopic == nsnull)
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return NS_ERROR_NULL_POINTER;
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rv = GetObserverList(aTopic, &anObserverList);
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if (NS_FAILED(rv)) return rv;
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return anObserverList->GetObserverList(anEnumerator);
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}
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// Enumerate observers of aTopic and call Observe on each.
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NS_IMETHODIMP nsObserverService::NotifyObservers(nsISupports *aSubject,
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const char *aTopic,
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const PRUnichar *someData) {
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nsresult rv = NS_OK;
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#ifdef NOTIFY_GLOBAL_OBSERVERS
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nsCOMPtr<nsISimpleEnumerator> globalObservers;
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#endif
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nsCOMPtr<nsISimpleEnumerator> observers;
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nsCOMPtr<nsISupports> observerRef;
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#ifdef NOTIFY_GLOBAL_OBSERVERS
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EnumerateObservers("*", getter_AddRefs(globalObservers));
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#endif
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rv = EnumerateObservers(aTopic, getter_AddRefs(observers));
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#ifdef NOTIFY_GLOBAL_OBSERVERS
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/* If there are no global observers and we failed to get normal observers
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* then we return the error indicating failure to get normal observers.
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*/
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if (!globalObservers && NS_FAILED(rv))
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return rv;
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#endif
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do
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{
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PRBool more = PR_FALSE;
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/* If observers is non null then null it out unless it really
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* has more elements (i.e. that call doesn't fail).
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*/
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if (observers && NS_FAILED(observers->HasMoreElements(&more)) || !more)
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{
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#ifdef NOTIFY_GLOBAL_OBSERVERS
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if (observers = globalObservers)
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globalObservers = nsnull;
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#else
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observers = nsnull;
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#endif
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}
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else
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{
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observers->GetNext(getter_AddRefs(observerRef));
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nsCOMPtr<nsIObserver> observer = do_QueryInterface(observerRef);
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if (observer)
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observer->Observe(aSubject, aTopic, someData);
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#ifdef NS_WEAK_OBSERVERS
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else
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{ // check for weak reference.
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nsCOMPtr<nsIWeakReference> weakRef = do_QueryInterface(observerRef);
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if (weakRef)
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weakRef->QueryReferent(NS_GET_IID(nsIObserver), getter_AddRefs(observer));
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if (observer)
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observer->Observe(aSubject, aTopic, someData);
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PR_LOG(observerServiceLog, PR_LOG_DEBUG, ("Notification - %s\n", aTopic ? aTopic : "undefined"));
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}
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#endif
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}
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} while (observers);
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return NS_OK;
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}
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////////////////////////////////////////////////////////////////////////////////
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