1 | /** |
2 | * Copyright 2021 Alibaba, Inc. and its affiliates. All Rights Reserved. |
3 | * |
4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
5 | * you may not use this file except in compliance with the License. |
6 | * You may obtain a copy of the License at |
7 | * |
8 | * http://www.apache.org/licenses/LICENSE-2.0 |
9 | * |
10 | * Unless required by applicable law or agreed to in writing, software |
11 | * distributed under the License is distributed on an "AS IS" BASIS, |
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
13 | * See the License for the specific language governing permissions and |
14 | * limitations under the License. |
15 | * |
16 | * \author guonix |
17 | * \date Nov 2020 |
18 | * \brief |
19 | */ |
20 | |
21 | #pragma once |
22 | |
23 | #include <mutex> |
24 | #include <unordered_map> |
25 | #include "meta.h" |
26 | #include "meta_impl.h" |
27 | |
28 | namespace proxima { |
29 | namespace be { |
30 | namespace meta { |
31 | |
32 | //! Predefined class |
33 | class MetaCache; |
34 | //! Alias for MetaCache |
35 | using MetaCachePtr = std::shared_ptr<MetaCache>; |
36 | |
37 | |
38 | //! Alias for CollectionMetaMap |
39 | using CollectionMetaMap = |
40 | std::unordered_map<std::string, CollectionImplPtrList>; |
41 | using CollectionImplMap = std::unordered_map<std::string, CollectionImplPtr>; |
42 | |
43 | |
44 | //! Alias CollectionFilter |
45 | using CollectionFilter = std::function<bool(const CollectionImplPtr &)>; |
46 | |
47 | |
48 | /*! |
49 | * MetaCache implementation |
50 | */ |
51 | class MetaCache { |
52 | public: |
53 | //! Default Filters |
54 | static CollectionFilter PassAllFilter; |
55 | static CollectionFilter IsCurrentFilter; |
56 | |
57 | public: |
58 | //! Constructor |
59 | MetaCache() = default; |
60 | |
61 | //! Destructor |
62 | ~MetaCache() = default; |
63 | |
64 | public: |
65 | //! Clear cache |
66 | void clear(); |
67 | |
68 | //! Delete collections |
69 | void delete_collection(const std::string &name); |
70 | |
71 | //! Has collection |
72 | bool exist_collection(const std::string &name) const; |
73 | |
74 | //! Retrieve collection by name |
75 | const CollectionImplPtr &get_collection(const std::string &name) const; |
76 | |
77 | //! Retrieve collection by name, with max revision id |
78 | const CollectionImplPtr &get_latest_collection(const std::string &name) const; |
79 | |
80 | //! Retrieve collection |
81 | const CollectionImplPtr &get_collection(const std::string &name, |
82 | const CollectionFilter &filter) const; |
83 | |
84 | //! Retrieve all the latest collections |
85 | void get_collections(CollectionMetaPtrList *collections) const; |
86 | |
87 | //! Retrieve collections with specific collection name |
88 | void get_collections(const std::string &collection, |
89 | CollectionMetaPtrList *collections) const; |
90 | |
91 | //! Retrieve all the collections |
92 | void get_collections(const CollectionFilter &filter, |
93 | CollectionMetaPtrList *collections) const; |
94 | |
95 | //! Retrieve collections with specific repository |
96 | void get_collections_by_repo(const std::string &repo, |
97 | CollectionMetaPtrList *collections) const; |
98 | |
99 | |
100 | //! Append collection to the cache |
101 | int append_collection(const CollectionImplPtr &collection); |
102 | |
103 | //! Append column to the cache |
104 | int append_column(ColumnImplPtr column); |
105 | |
106 | //! Append repository to collection |
107 | int append_repository(DatabaseRepositoryImplPtr repository); |
108 | |
109 | private: |
110 | //! Collection Cache |
111 | CollectionMetaMap cache_{}; |
112 | |
113 | //! Collection mapping, which help to allocate column with collection |
114 | CollectionImplMap mapping_{}; |
115 | }; |
116 | |
117 | |
118 | } // namespace meta |
119 | } // namespace be |
120 | } // namespace proxima |
121 | |