/* -*- 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

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