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diff --git a/filter/source/config/cache/cacheupdatelistener.hxx b/filter/source/config/cache/cacheupdatelistener.hxx
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+++ b/filter/source/config/cache/cacheupdatelistener.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 .
+ */
+#pragma once
+
+#include "filtercache.hxx"
+#include <com/sun/star/util/XChangesListener.hpp>
+#include <cppuhelper/implbase.hxx>
+#include <mutex>
+
+
+namespace filter::config {
+
+
+/** @short      implements a listener, which will update the
+                global filter cache, if the underlying configuration
+                wa changed by other processes.
+ */
+class CacheUpdateListener : public ::cppu::WeakImplHelper< css::util::XChangesListener >
+{
+
+    // member
+
+    private:
+
+        std::mutex  m_aMutex;
+
+        /** @short  reference to the singleton(!) filter cache implementation,
+                    which should be updated by this thread. */
+        FilterCache &m_rCache;
+
+        /** @short  holds the configuration access, where we listen alive. */
+        css::uno::Reference< css::uno::XInterface > m_xConfig;
+
+        /** @short  every instance of this update listener listen on
+                    a special sub set of the filter configuration.
+                    So it should know, which type of configuration entry
+                    it must put into the filter cache, if the configuration notifies changes ... */
+        FilterCache::EItemType m_eConfigType;
+
+
+    // native interface
+
+    public:
+
+
+        // ctor/dtor
+
+        /** @short  initialize new instance of this class.
+
+            @descr  Listening won't be started here. It can be done
+                    by calling startListening() on this instance.
+
+            @see    startListening()
+
+            @param  xConfigAccess
+                    the configuration access, where this instance should listen for changes.
+
+            @param  eConfigType
+                    specify the type of configuration.
+         */
+        CacheUpdateListener(FilterCache &rFilterCache,
+                            css::uno::Reference< css::uno::XInterface > xConfigAccess,
+                            FilterCache::EItemType eConfigType);
+
+
+        /** @short  standard dtor.
+         */
+        virtual ~CacheUpdateListener() override;
+
+
+        /** @short  starts listening.
+         */
+        void startListening();
+
+
+        /** @short  stop listening.
+         */
+        void stopListening();
+
+
+    // uno interface
+
+    public:
+
+
+        // XChangesListener
+
+        virtual void SAL_CALL changesOccurred(const css::util::ChangesEvent& aEvent) override;
+
+
+        // lang.XEventListener
+        virtual void SAL_CALL disposing(const css::lang::EventObject& aEvent) override;
+};
+
+} // namespace filter::config
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */