genode/repos/os/include/file_system/open_node.h

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/*
* \brief Representation of an open file system node within the component
* \author Christian Prochaska
* \date 2017-06-09
*/
/*
* Copyright (C) 2017 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU Affero General Public License version 3.
*/
#ifndef _OPEN_NODE_H_
#define _OPEN_NODE_H_
/* Genode includes */
#include <file_system/listener.h>
#include <file_system_session/file_system_session.h>
namespace File_system {
/*
* \param NODE component-specific node type
*/
template <typename NODE> class Open_node;
}
template <typename NODE>
class File_system::Open_node : public File_system::Node
{
private:
Genode::Id_space<File_system::Node>::Element _element;
NODE &_node;
Genode::Constructible<File_system::Listener> _listener;
public:
Open_node(NODE &node, Genode::Id_space<File_system::Node> &id_space)
: _element(*this, id_space),
_node(node) { }
~Open_node()
{
if (_listener.constructed()) {
_node.remove_listener(&*_listener);
_listener.destruct();
}
}
NODE &node() { return _node; }
File_system::Listener &listener() { return *_listener; }
Genode::Id_space<File_system::Node>::Id id() { return _element.id(); }
/**
* Register packet stream sink to be notified of node changes
*/
void register_notify(File_system::Sink &sink)
{
/*
* If there was already a handler registered for the node,
* remove the old handler.
*/
if (_listener.constructed()) {
_node.remove_listener(&*_listener);
_listener.destruct();
}
/*
* Register new handler
*/
_listener.construct(sink, id());
_node.add_listener(&*_listener);
}
};
#endif /* _OPEN_NODE_H_ */