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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 09:06:44 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 09:06:44 +0000
commited5640d8b587fbcfed7dd7967f3de04b37a76f26 (patch)
tree7a5f7c6c9d02226d7471cb3cc8fbbf631b415303 /include/svl/broadcast.hxx
parentInitial commit. (diff)
downloadlibreoffice-ed5640d8b587fbcfed7dd7967f3de04b37a76f26.tar.xz
libreoffice-ed5640d8b587fbcfed7dd7967f3de04b37a76f26.zip
Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'include/svl/broadcast.hxx')
-rw-r--r--include/svl/broadcast.hxx103
1 files changed, 103 insertions, 0 deletions
diff --git a/include/svl/broadcast.hxx b/include/svl/broadcast.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed
+ * with this work for additional information regarding copyright
+ * ownership. The ASF licenses this file to you under the Apache
+ * License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0 .
+ */
+#ifndef INCLUDED_SVL_BROADCAST_HXX
+#define INCLUDED_SVL_BROADCAST_HXX
+
+#include <svl/svldllapi.h>
+
+#include <vector>
+
+class SvtListener;
+class SfxHint;
+
+class SVL_DLLPUBLIC SvtBroadcaster
+{
+public:
+ friend class SvtListener;
+
+ typedef std::vector<SvtListener*> ListenersType;
+
+private:
+ const SvtBroadcaster& operator=(const SvtBroadcaster &) = delete;
+
+ /**
+ * Ensure that the container doesn't contain any duplicated listener
+ * entries. As a side effect, the listeners get sorted by pointer values
+ * after this call.
+ */
+ void Normalize() const;
+
+ void Add( SvtListener* p );
+ void Remove( SvtListener* p );
+
+protected:
+ virtual void ListenersGone();
+
+public:
+ SvtBroadcaster()
+ : mnEmptySlots(0), mnListenersFirstUnsorted(0), mbAboutToDie(false)
+ , mbDisposing(false), mbDestNormalized(true) {}
+ SvtBroadcaster( const SvtBroadcaster &rBC );
+ virtual ~SvtBroadcaster();
+
+ void Broadcast( const SfxHint &rHint );
+
+ ListenersType& GetAllListeners();
+ const ListenersType& GetAllListeners() const;
+
+ bool HasListeners() const { return (maListeners.size() - mnEmptySlots) > 0; }
+
+ /**
+ * Listeners and broadcasters are M:N relationship. If you want to
+ * destruct them, you easily end up in O(M*N) situation; where for every
+ * listener, you iterate all broadcasters, to remove that one listener.
+ *
+ * To avoid that, use this call to announce to the broadcaster it is going
+ * to die, and the listeners do not have to bother with removing
+ * themselves from the broadcaster - the broadcaster will not broadcast
+ * anything after the PrepareForDestruction() call anyway.
+ */
+ void PrepareForDestruction();
+
+private:
+ /// contains only one of each listener, which is enforced by SvtListener
+ mutable ListenersType maListeners;
+
+ /// When the broadcaster is about to die, collect listeners that asked for removal.
+ mutable ListenersType maDestructedListeners;
+
+ /**
+ Note that this class is very performance sensitive, so the following fields have been
+ carefully sized and packed so we can access them quickly, while also taking as little CPU cache
+ space as possible (because e.g. calc can have a LOT of them)
+ */
+ mutable sal_Int32 mnEmptySlots;
+ // The first item in maListeners that is not sorted. The container can become large, so this optimizes sorting.
+ mutable sal_Int32 mnListenersFirstUnsorted;
+ /// Indicate that this broadcaster will be destructed (we indicate this on all ScColumn's broadcasters during the ScTable destruction, eg.)
+ bool mbAboutToDie:1;
+ bool mbDisposing:1;
+ // Whether maDestructedListeners is sorted or not.
+ mutable bool mbDestNormalized:1;
+};
+
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */