diff options
author | Damjan Marion <damarion@cisco.com> | 2020-10-16 15:28:47 +0200 |
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committer | Damjan Marion <damarion@cisco.com> | 2020-10-16 15:33:18 +0200 |
commit | 8c1afb56b6a479d6595444238815c4ced0e754ea (patch) | |
tree | 115e0d7685cf24f3a77549e5bc1ce151a09cec75 /extras/deprecated/vom/vom/singular_db.hpp | |
parent | fbe4e36b9924c135410e1d52c959d0c3629be12b (diff) |
misc: deprecate VOM
Type: make
Change-Id: Ifb3e52af93d24fcc2f2e6a0c408e16902a2fe553
Signed-off-by: Damjan Marion <damarion@cisco.com>
Diffstat (limited to 'extras/deprecated/vom/vom/singular_db.hpp')
-rw-r--r-- | extras/deprecated/vom/vom/singular_db.hpp | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/extras/deprecated/vom/vom/singular_db.hpp b/extras/deprecated/vom/vom/singular_db.hpp new file mode 100644 index 00000000000..15ec9c5af59 --- /dev/null +++ b/extras/deprecated/vom/vom/singular_db.hpp @@ -0,0 +1,148 @@ +/* + * 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 <map> +#include <memory> +#include <ostream> + +#include "vom/logger.hpp" + +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 begin() const { return m_map.cbegin(); } + + /** + * Get iterator to the beginning of the DB + */ + const_iterator end() const { 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; } + + /** + * 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<const KEY, std::weak_ptr<OBJ>> m_map; +}; +}; + +/* + * fd.io coding-style-patch-verification: OFF + * + * Local Variables: + * eval: (c-set-style "mozilla") + * End: + */ + +#endif |