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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:17:27 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:17:27 +0000
commitf215e02bf85f68d3a6106c2a1f4f7f063f819064 (patch)
tree6bb5b92c046312c4e95ac2620b10ddf482d3fa8b /src/libs/xpcom18a4/xpcom/ds/nsObserverService.cpp
parentInitial commit. (diff)
downloadvirtualbox-f215e02bf85f68d3a6106c2a1f4f7f063f819064.tar.xz
virtualbox-f215e02bf85f68d3a6106c2a1f4f7f063f819064.zip
Adding upstream version 7.0.14-dfsg.upstream/7.0.14-dfsg
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/libs/xpcom18a4/xpcom/ds/nsObserverService.cpp')
-rw-r--r--src/libs/xpcom18a4/xpcom/ds/nsObserverService.cpp227
1 files changed, 227 insertions, 0 deletions
diff --git a/src/libs/xpcom18a4/xpcom/ds/nsObserverService.cpp b/src/libs/xpcom18a4/xpcom/ds/nsObserverService.cpp
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+++ b/src/libs/xpcom18a4/xpcom/ds/nsObserverService.cpp
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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 ***** */
+
+#include "prlog.h"
+#include "prlock.h"
+#include "nsIFactory.h"
+#include "nsIServiceManager.h"
+#include "nsIComponentManager.h"
+#include "nsIObserverService.h"
+#include "nsObserverService.h"
+#include "nsObserverList.h"
+#include "nsHashtable.h"
+#include "nsIWeakReference.h"
+
+#define NS_WEAK_OBSERVERS
+
+
+
+#if defined(PR_LOGGING)
+// Log module for nsObserverService logging...
+//
+// To enable logging (see prlog.h for full details):
+//
+// set NSPR_LOG_MODULES=ObserverService:5
+// set NSPR_LOG_FILE=nspr.log
+//
+// this enables PR_LOG_DEBUG level information and places all output in
+// the file nspr.log
+PRLogModuleInfo* observerServiceLog = nsnull;
+#endif /* PR_LOGGING */
+
+////////////////////////////////////////////////////////////////////////////////
+// nsObserverService Implementation
+
+
+NS_IMPL_THREADSAFE_ISUPPORTS1(nsObserverService, nsIObserverService)
+
+nsObserverService::nsObserverService()
+ : mObserverTopicTable(nsnull)
+{
+}
+
+nsObserverService::~nsObserverService(void)
+{
+ if(mObserverTopicTable)
+ delete mObserverTopicTable;
+}
+
+NS_METHOD
+nsObserverService::Create(nsISupports* outer, const nsIID& aIID, void* *aInstancePtr)
+{
+#if defined(PR_LOGGING)
+ if (!observerServiceLog)
+ observerServiceLog = PR_NewLogModule("ObserverService");
+#endif
+
+ nsresult rv;
+ nsObserverService* os = new nsObserverService();
+ if (os == nsnull)
+ return NS_ERROR_OUT_OF_MEMORY;
+ NS_ADDREF(os);
+ rv = os->QueryInterface(aIID, aInstancePtr);
+ NS_RELEASE(os);
+ return rv;
+}
+
+static PRBool PR_CALLBACK
+ReleaseObserverList(nsHashKey *aKey, void *aData, void* closure)
+{
+ nsObserverList* observerList = NS_STATIC_CAST(nsObserverList*, aData);
+ delete(observerList);
+ return PR_TRUE;
+}
+
+nsresult nsObserverService::GetObserverList(const char* aTopic, nsObserverList** anObserverList)
+{
+ if (anObserverList == nsnull)
+ return NS_ERROR_NULL_POINTER;
+
+ if(mObserverTopicTable == nsnull)
+ {
+ mObserverTopicTable = new nsObjectHashtable(nsnull,
+ nsnull, // should never be cloned
+ ReleaseObserverList,
+ nsnull,
+ 256,
+ PR_TRUE);
+ if (mObserverTopicTable == nsnull)
+ return NS_ERROR_OUT_OF_MEMORY;
+ }
+
+
+ nsCStringKey key(aTopic);
+
+ nsObserverList *topicObservers;
+ topicObservers = (nsObserverList *) mObserverTopicTable->Get(&key);
+
+ if (topicObservers)
+ {
+ *anObserverList = topicObservers;
+ return NS_OK;
+ }
+
+ topicObservers = new nsObserverList();
+ if (!topicObservers)
+ return NS_ERROR_OUT_OF_MEMORY;
+
+ *anObserverList = topicObservers;
+ mObserverTopicTable->Put(&key, topicObservers);
+
+ return NS_OK;
+}
+
+NS_IMETHODIMP nsObserverService::AddObserver(nsIObserver* anObserver, const char* aTopic, PRBool ownsWeak)
+{
+ nsObserverList* anObserverList;
+ nsresult rv;
+
+ if (anObserver == nsnull || aTopic == nsnull)
+ return NS_ERROR_NULL_POINTER;
+
+ rv = GetObserverList(aTopic, &anObserverList);
+ if (NS_FAILED(rv)) return rv;
+
+ return anObserverList->AddObserver(anObserver, ownsWeak);
+}
+
+NS_IMETHODIMP nsObserverService::RemoveObserver(nsIObserver* anObserver, const char* aTopic)
+{
+ nsObserverList* anObserverList;
+ nsresult rv;
+
+ if (anObserver == nsnull || aTopic == nsnull)
+ return NS_ERROR_NULL_POINTER;
+
+ rv = GetObserverList(aTopic, &anObserverList);
+ if (NS_FAILED(rv)) return rv;
+
+ return anObserverList->RemoveObserver(anObserver);
+}
+
+NS_IMETHODIMP nsObserverService::EnumerateObservers(const char* aTopic, nsISimpleEnumerator** anEnumerator)
+{
+ nsObserverList* anObserverList;
+ nsresult rv;
+
+ if (anEnumerator == nsnull || aTopic == nsnull)
+ return NS_ERROR_NULL_POINTER;
+
+ rv = GetObserverList(aTopic, &anObserverList);
+ if (NS_FAILED(rv)) return rv;
+
+ return anObserverList->GetObserverList(anEnumerator);
+}
+
+// Enumerate observers of aTopic and call Observe on each.
+NS_IMETHODIMP nsObserverService::NotifyObservers( nsISupports *aSubject,
+ const char *aTopic,
+ const PRUnichar *someData ) {
+ nsresult rv = NS_OK;
+ nsCOMPtr<nsISimpleEnumerator> observers;
+ nsCOMPtr<nsISupports> observerRef;
+
+ rv = EnumerateObservers( aTopic, getter_AddRefs(observers) );
+ if ( NS_FAILED( rv ) )
+ return rv;
+ PRBool loop = PR_TRUE;
+ while( NS_SUCCEEDED(observers->HasMoreElements(&loop)) && loop)
+ {
+ observers->GetNext(getter_AddRefs(observerRef));
+ nsCOMPtr<nsIObserver> observer = do_QueryInterface(observerRef);
+ if ( observer )
+ observer->Observe( aSubject, aTopic, someData );
+#ifdef NS_WEAK_OBSERVERS
+ else
+ { // check for weak reference.
+ nsCOMPtr<nsIWeakReference> weakRef = do_QueryInterface(observerRef);
+ if ( weakRef )
+ weakRef->QueryReferent(NS_GET_IID(nsIObserver), getter_AddRefs(observer));
+
+ if ( observer )
+ observer->Observe( aSubject, aTopic, someData );
+
+ PR_LOG(observerServiceLog, PR_LOG_DEBUG, ("Notification - %s\n", aTopic ? aTopic : "undefined"));
+
+ }
+#endif
+ }
+ return NS_OK;
+}
+////////////////////////////////////////////////////////////////////////////////
+