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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_INST_DB_H__
+#define __VOM_INST_DB_H__
+
+#include <memory>
+#include <ostream>
+
+namespace VOM {
+/**
+ * A Database to store the unique 'singular' instances of a single object
+ * type.
+ * The instances are stored as weak pointers. So the DB does not own these
+ * objects, they are owned by object in the client_db.
+ */
+template <typename KEY, typename OBJ>
+class singular_db
+{
+public:
+ /**
+ * Constructor
+ */
+ singular_db() {}
+
+ /**
+ * Iterator
+ */
+ typedef
+ typename std::map<KEY, std::weak_ptr<OBJ>>::const_iterator const_iterator;
+
+ /**
+ * Get iterator to the beginning of the DB
+ */
+ const_iterator cbegin() { return m_map.cbegin(); }
+
+ /**
+ * Get iterator to the beginning of the DB
+ */
+ const_iterator cend() { return m_map.cend(); }
+
+ /**
+ * Find or add the object to the store.
+ * The object passed is deisred state. A new instance will be copy
+ * constructed from it. This function is templatised on the object type
+ * passed, which may be drrived from, the object type stored. this
+ * prevents slicing during the make_shared construction.
+ */
+ template <typename DERIVED>
+ std::shared_ptr<OBJ> find_or_add(const KEY& key, const DERIVED& obj)
+ {
+ auto search = m_map.find(key);
+
+ if (search == m_map.end()) {
+ std::shared_ptr<OBJ> sp = std::make_shared<DERIVED>(obj);
+
+ m_map[key] = sp;
+
+ VOM_LOG(log_level_t::DEBUG) << *sp;
+ return (sp);
+ }
+
+ return (search->second.lock());
+ }
+
+ /**
+ * Find the object to the store.
+ */
+ std::shared_ptr<OBJ> find(const KEY& key)
+ {
+ auto search = m_map.find(key);
+
+ if (search == m_map.end()) {
+ std::shared_ptr<OBJ> sp(NULL);
+
+ return (sp);
+ }
+
+ return (search->second.lock());
+ }
+
+ /**
+ * Release the object from the DB store, if it's the one we have stored
+ */
+ void release(const KEY& key, const OBJ* obj)
+ {
+ auto search = m_map.find(key);
+
+ if (search != m_map.end()) {
+ if (search->second.expired()) {
+ m_map.erase(key);
+ } else {
+ std::shared_ptr<OBJ> sp = m_map[key].lock();
+
+ if (sp.get() == obj) {
+ m_map.erase(key);
+ }
+ }
+ }
+ }
+
+ /**
+ * Find the object to the store.
+ */
+ void add(const KEY& key, std::shared_ptr<OBJ> sp) { m_map[key] = sp; }
+
+ /**
+ * Print each of the object in the DB into the stream provided
+ */
+ void dump(std::ostream& os)
+ {
+ for (auto entry : m_map) {
+ os << "key: " << entry.first << std::endl;
+ os << " " << entry.second.lock()->to_string() << std::endl;
+ }
+ }
+
+ /**
+ * Populate VPP from current state, on VPP restart
+ */
+ void replay()
+ {
+ for (auto entry : m_map) {
+ entry.second.lock()->replay();
+ }
+ }
+
+private:
+ /**
+ * the map of objects against their key
+ */
+ std::map<KEY, std::weak_ptr<OBJ>> m_map;
+};
+};
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "mozilla")
+ * End:
+ */
+
+#endif