/Users/deen/code/yugabyte-db/src/yb/rocksdb/db/db_iterator_wrapper.h
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1 | | // Copyright (c) Yugabyte, Inc. |
2 | | // |
3 | | // Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except |
4 | | // in compliance with the License. You may obtain a copy of the License at |
5 | | // |
6 | | // http://www.apache.org/licenses/LICENSE-2.0 |
7 | | // |
8 | | // Unless required by applicable law or agreed to in writing, software distributed under the License |
9 | | // is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express |
10 | | // or implied. See the License for the specific language governing permissions and limitations |
11 | | // under the License. |
12 | | |
13 | | #ifndef YB_ROCKSDB_DB_DB_ITERATOR_WRAPPER_H |
14 | | #define YB_ROCKSDB_DB_DB_ITERATOR_WRAPPER_H |
15 | | |
16 | | #include <memory> |
17 | | |
18 | | #include "yb/rocksdb/iterator.h" |
19 | | |
20 | | namespace rocksdb { |
21 | | |
22 | | class DBIteratorWrapper : public Iterator { |
23 | | public: |
24 | | explicit DBIteratorWrapper(Iterator* wrapped) |
25 | 0 | : wrapped_(wrapped) {} |
26 | | |
27 | 0 | virtual ~DBIteratorWrapper() {} |
28 | | |
29 | 0 | bool Valid() const override { |
30 | 0 | return wrapped_->Valid(); |
31 | 0 | } |
32 | | |
33 | 0 | void SeekToFirst() override { |
34 | 0 | wrapped_->SeekToFirst(); |
35 | 0 | } |
36 | | |
37 | 0 | void SeekToLast() override { |
38 | 0 | wrapped_->SeekToLast(); |
39 | 0 | } |
40 | | |
41 | 0 | void Seek(const Slice& target) override { |
42 | 0 | wrapped_->Seek(target); |
43 | 0 | } |
44 | | |
45 | 0 | void Next() override { |
46 | 0 | wrapped_->Next(); |
47 | 0 | } |
48 | | |
49 | 0 | void Prev() override { |
50 | 0 | wrapped_->Prev(); |
51 | 0 | } |
52 | | |
53 | 0 | Slice key() const override { |
54 | 0 | return wrapped_->key(); |
55 | 0 | } |
56 | | |
57 | 0 | Slice value() const override { |
58 | 0 | return wrapped_->value(); |
59 | 0 | } |
60 | | |
61 | 0 | Status status() const override { |
62 | 0 | return wrapped_->status(); |
63 | 0 | } |
64 | | |
65 | 0 | Status GetProperty(std::string prop_name, std::string* prop) override { |
66 | 0 | return wrapped_->GetProperty(prop_name, prop); |
67 | 0 | } |
68 | | |
69 | | protected: |
70 | | std::unique_ptr<Iterator> wrapped_; |
71 | | }; |
72 | | |
73 | | // A wrapper that logs all operations on the iterator. |
74 | | class TransitionLoggingIteratorWrapper : public DBIteratorWrapper { |
75 | | public: |
76 | | TransitionLoggingIteratorWrapper( |
77 | | Iterator* wrapped, |
78 | | const std::string& rocksdb_log_prefix) |
79 | | : DBIteratorWrapper(wrapped), |
80 | 0 | rocksdb_log_prefix_(rocksdb_log_prefix) {} |
81 | | |
82 | | void SeekToFirst() override; |
83 | | void SeekToLast() override; |
84 | | void Seek(const Slice& target) override; |
85 | | void Next() override; |
86 | | void Prev() override; |
87 | | |
88 | | private: |
89 | | std::string LogPrefix() const; |
90 | | std::string StateStr() const; |
91 | | |
92 | | template<typename Functor> |
93 | | void LogBeforeAndAfter(const std::string& action_str, const Functor& functor); |
94 | | |
95 | | std::string rocksdb_log_prefix_; |
96 | | }; |
97 | | |
98 | | } // namespace rocksdb |
99 | | |
100 | | #endif // YB_ROCKSDB_DB_DB_ITERATOR_WRAPPER_H |