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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_KEY_DB_H__
+#define __VOM_KEY_DB_H__
+
+#include <map>
+#include <set>
+
+#include "vom/object_base.hpp"
+
+namespace VOM {
+/**
+ * A convenitent typedef for set of objects owned.
+ * A set of shared pointers. This is how the reference counting
+ * of an object in the model it managed. Once all these shared ptr
+ * and hence references are gone, the object is deleted and any state
+ * in VPP is removed.
+ */
+typedef std::set<object_ref> object_ref_list;
+
+/**
+ * A DB storing the objects that each owner/key owns.
+ * Each object is reference counter by each key that owns it. When
+ * no more references exist the object is destroyed.
+ */
+class client_db
+{
+public:
+ /**
+ * In the opflex world each entity is known by a URI which can be
+ * converted
+ * into a string. We use the string type, since it allows us to keep
+ * this VPP
+ * specific code independent of opflex types. I might consider making
+ * this
+ * a template parameter one day...
+ */
+ typedef const std::string key_t;
+
+ /**
+ * Find the objects owned by the key
+ */
+ object_ref_list& find(const key_t& k);
+
+ /**
+ * flush, i.e. un-reference, all objects owned by the key
+ */
+ void flush(const key_t& k);
+
+ /**
+ * Print each of the object in the DB into the stream provided
+ */
+ void dump(const key_t& key, std::ostream& os);
+
+ /**
+ * Print each KEY
+ */
+ void dump(std::ostream& os);
+
+private:
+ /**
+ * A map of keys versus the object they reference
+ */
+ std::map<key_t, object_ref_list> m_objs;
+};
+};
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "mozilla")
+ * End:
+ */
+
+#endif