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| 1 // Copyright 2015 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef CHROME_BROWSER_ANDROID_HISTORY_REPORT_DELTA_FILE_BACKEND_LEVELDB_H_ |
| 6 #define CHROME_BROWSER_ANDROID_HISTORY_REPORT_DELTA_FILE_BACKEND_LEVELDB_H_ |
| 7 |
| 8 #include <vector> |
| 9 |
| 10 #include "base/files/file_path.h" |
| 11 #include "base/memory/scoped_ptr.h" |
| 12 |
| 13 class GURL; |
| 14 |
| 15 namespace leveldb { |
| 16 class DB; |
| 17 } |
| 18 |
| 19 namespace history_report { |
| 20 |
| 21 class DeltaFileEntryWithData; |
| 22 |
| 23 // Backend for delta file. |
| 24 class DeltaFileBackend { |
| 25 public: |
| 26 explicit DeltaFileBackend(const base::FilePath& dir); |
| 27 ~DeltaFileBackend(); |
| 28 |
| 29 // Adds new addition entry to delta file |
| 30 void PageAdded(const GURL& url); |
| 31 // Adds new deletion entry to delta file |
| 32 void PageDeleted(const GURL& url); |
| 33 // Removes all delta file entries with |
| 34 // sequence number <= min(|lower_bound|, max sequence number - 1). |
| 35 // Returns max sequence number in delta file. |
| 36 int64 Trim(int64 lower_bound); |
| 37 // Recreates delta file using given |urls|. |
| 38 bool Recreate(const std::vector<std::string>& urls); |
| 39 // Provides up to |limit| delta file entries with |
| 40 // sequence number > |last_seq_no|. |
| 41 scoped_ptr<std::vector<DeltaFileEntryWithData> > Query(int64 last_seq_no, |
| 42 int32 limit); |
| 43 // Removes all entries from delta file |
| 44 void Clear(); |
| 45 |
| 46 // Dumps internal state to string. For debuging. |
| 47 std::string Dump(); |
| 48 |
| 49 private: |
| 50 // Starts delta file backend. |
| 51 bool Init(); |
| 52 |
| 53 bool EnsureInitialized(); |
| 54 |
| 55 class DigitsComparator; |
| 56 |
| 57 base::FilePath path_; |
| 58 scoped_ptr<leveldb::DB> db_; |
| 59 scoped_ptr<DigitsComparator> leveldb_cmp_; |
| 60 |
| 61 DISALLOW_COPY_AND_ASSIGN(DeltaFileBackend); |
| 62 }; |
| 63 |
| 64 } // namespace history_report |
| 65 |
| 66 #endif // CHROME_BROWSER_ANDROID_HISTORY_REPORT_DELTA_FILE_BACKEND_LEVELDB_H_ |
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