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+/*
+ * Copyright (c) 2017 Cisco and/or its affiliates.
+ * Licensed 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
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __VOM_OBJECT_H__
+#define __VOM_OBJECT_H__
+
+#include <memory>
+#include <string>
+
+#include "vom/types.hpp"
+
+namespace VOM {
+/**
+ * A base class for all object_base in the VPP object_base-Model.
+ * provides the abstract interface.
+ */
+class object_base
+{
+public:
+ /**
+ * convert to string format for debug purposes
+ */
+ virtual std::string to_string() const = 0;
+
+ /**
+ * Sweep/reap the object if still stale
+ */
+ virtual void sweep(void) = 0;
+
+ /**
+ * replay the object to create it in hardware
+ */
+ virtual void replay(void) = 0;
+
+protected:
+ /**
+ * Constructable by derived classes only
+ */
+ object_base() = default;
+ /**
+ * Destructor
+ */
+ virtual ~object_base() = default;
+
+private:
+ /**
+ * note we are not maintaining dependencies back to the
+ * keys. i.e. this object does not know all the keys that
+ * refer to it.
+ */
+};
+
+/**
+ * object state
+ */
+enum obj_state_t
+{
+ OBJECT_STATE_NONE = 0,
+ /**
+ * indicates the object is stale. This flag is set
+ * when a new epoch is declared. the flag is cleared
+ * when the object is updated in the new epoch. If the
+ * flag is still set after convergence is declared then
+ * the object is deleted
+ */
+ OBJECT_STATE_STALE,
+};
+
+/**
+ * A represenation of a reference to a VPP object.
+ * the reference counting is held through the use of shared pointers.
+ * We also maintain the state of the object ready for mark n' sweep.
+ */
+class object_ref
+{
+public:
+ /**
+ * Constructor
+ */
+ object_ref(std::shared_ptr<object_base> obj);
+
+ /**
+ * less than operator
+ */
+ bool operator<(const object_ref& other) const;
+
+ /**
+ * Return the shared pointer
+ */
+ std::shared_ptr<object_base> obj() const;
+
+ /**
+ * Mark the reference object as stale
+ */
+ void mark() const;
+
+ /**
+ * Clear the stale flag on the object
+ */
+ void clear() const;
+
+ /**
+ * Query if the object is stale
+ */
+ bool stale() const;
+
+private:
+ /**
+ * The reference object
+ */
+ std::shared_ptr<object_base> m_obj;
+
+ /**
+ * Not part of the key (in the set) so we can change it
+ * whilst iterating
+ */
+ mutable obj_state_t m_state;
+};
+
+/**
+ * ostream print of a VPP Obect
+ */
+std::ostream& operator<<(std::ostream& os, const object_base& o);
+};
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "mozilla")
+ * End:
+ */
+
+#endif