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73 lines
1.3 KiB
C++
73 lines
1.3 KiB
C++
/*
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* \brief File-system node
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* \author Norman Feske
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* \date 2012-04-11
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*/
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/*
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* Copyright (C) 2012-2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _FILE_SYSTEM__NODE_H_
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#define _FILE_SYSTEM__NODE_H_
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/* Genode includes */
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#include <file_system/listener.h>
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#include <util/list.h>
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#include <base/lock.h>
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namespace File_system {
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class Node_base
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{
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private:
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Genode::List<Listener> _listeners;
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typedef Listener::Version Version;
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Version _curr_version { 0 };
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public:
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virtual ~Node_base()
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{
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/* propagate event to listeners */
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mark_as_updated();
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notify_listeners();
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while (_listeners.first())
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_listeners.remove(_listeners.first());
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}
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void add_listener(Listener *listener)
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{
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_listeners.insert(listener);
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}
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void remove_listener(Listener *listener)
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{
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_listeners.remove(listener);
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}
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void notify_listeners()
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{
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for (Listener *curr = _listeners.first(); curr; curr = curr->next())
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curr->notify(_curr_version);
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}
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void mark_as_updated()
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{
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_curr_version = Version { _curr_version.value + 1 };
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}
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Version curr_version() const { return _curr_version; }
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};
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}
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#endif /* _FILE_SYSTEM__NODE_H_ */
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