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+// Copyright (C) 2010 CZ NIC
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+//
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+// Permission to use, copy, modify, and/or distribute this software for any
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+// purpose with or without fee is hereby granted, provided that the above
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+// copyright notice and this permission notice appear in all copies.
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+//
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+// THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
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+// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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+// AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
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+// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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+// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
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+// OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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+// PERFORMANCE OF THIS SOFTWARE.
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+
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+// $id$
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+
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+#ifndef __FETCHABLE_H
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+#define __FETCHABLE_H
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+
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+/**
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+ * \file fetchable.h
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+ * \short Interface of information that can be fetched.
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+ */
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+
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+namespace isc {
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+namespace nsas {
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+
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+/**
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+ * \short Interface of information that can be fetched.
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+ *
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+ * This just holds a state of information that can be fetched from somewhere.
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+ * No locking is performed, if it is desirable, it should be locked manually.
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+ */
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+class Fetchable {
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+ public:
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+ /// \short States the Fetchable object can be in.
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+ enum State {
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+ /// \short No one yet asked for the information.
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+ NOT_ASKED,
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+ /// \short The information is asked for but it did not arrive.
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+ IN_PROGRESS,
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+ /// \short It is not possible to get the information.
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+ UNREACHABLE,
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+ /// \short The information is already present.
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+ READY
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+ };
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+ /// \short Constructors
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+ //@{
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+ /// This creates the Fetchable object in NOT_ASKED state.
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+ Fetchable() :
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+ state_(NOT_ASKED)
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+ { }
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+ /// This creates the Fetchable object in the given state.
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+ Fetchable(State state) :
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+ state_(state)
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+ { }
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+ //@}
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+ /// \short Getter and setter of current state.
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+ //@{
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+ State getState() const { return state_; }
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+ void setState(State state) { state_ = state; }
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+ //@}
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+ private:
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+ State state_;
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+};
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+
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+} // namespace nsas
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+} // namespace isc
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+
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+#endif // __FETCHABLE_H
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