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| 1 // Copyright (c) 2012 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 #include <algorithm> | |
| 6 #include <string> | |
| 7 | |
| 8 #include "base/strings/string_util.h" | |
| 9 #include "chrome/browser/history/archived_database.h" | |
| 10 #include "sql/transaction.h" | |
| 11 | |
| 12 namespace history { | |
| 13 | |
| 14 namespace { | |
| 15 | |
| 16 static const int kCurrentVersionNumber = 4; | |
| 17 static const int kCompatibleVersionNumber = 2; | |
| 18 | |
| 19 } // namespace | |
| 20 | |
| 21 ArchivedDatabase::ArchivedDatabase() { | |
| 22 } | |
| 23 | |
| 24 ArchivedDatabase::~ArchivedDatabase() { | |
| 25 } | |
| 26 | |
| 27 bool ArchivedDatabase::Init(const base::FilePath& file_name) { | |
| 28 // Set the database page size to something a little larger to give us | |
| 29 // better performance (we're typically seek rather than bandwidth limited). | |
| 30 // This only has an effect before any tables have been created, otherwise | |
| 31 // this is a NOP. Must be a power of 2 and a max of 8192. | |
| 32 db_.set_page_size(4096); | |
| 33 | |
| 34 // Don't use very much memory caching this database. We seldom use it for | |
| 35 // anything important. | |
| 36 db_.set_cache_size(64); | |
| 37 | |
| 38 // Run the database in exclusive mode. Nobody else should be accessing the | |
| 39 // database while we're running, and this will give somewhat improved perf. | |
| 40 db_.set_exclusive_locking(); | |
| 41 | |
| 42 if (!db_.Open(file_name)) | |
| 43 return false; | |
| 44 | |
| 45 if (!InitTables()) { | |
| 46 db_.Close(); | |
| 47 return false; | |
| 48 } | |
| 49 | |
| 50 return true; | |
| 51 } | |
| 52 | |
| 53 bool ArchivedDatabase::InitTables() { | |
| 54 sql::Transaction transaction(&db_); | |
| 55 if (!transaction.Begin()) | |
| 56 return false; | |
| 57 | |
| 58 // Version check. | |
| 59 if (!meta_table_.Init(&db_, kCurrentVersionNumber, | |
| 60 kCompatibleVersionNumber)) | |
| 61 return false; | |
| 62 | |
| 63 // Create the tables. | |
| 64 if (!CreateURLTable(false) || !InitVisitTable() || | |
| 65 !InitKeywordSearchTermsTable()) | |
| 66 return false; | |
| 67 | |
| 68 CreateMainURLIndex(); | |
| 69 CreateKeywordSearchTermsIndices(); | |
| 70 | |
| 71 if (EnsureCurrentVersion() != sql::INIT_OK) | |
| 72 return false; | |
| 73 | |
| 74 return transaction.Commit(); | |
| 75 } | |
| 76 | |
| 77 void ArchivedDatabase::TrimMemory(bool aggressively) { | |
| 78 db_.TrimMemory(aggressively); | |
| 79 } | |
| 80 | |
| 81 void ArchivedDatabase::BeginTransaction() { | |
| 82 db_.BeginTransaction(); | |
| 83 } | |
| 84 | |
| 85 void ArchivedDatabase::CommitTransaction() { | |
| 86 db_.CommitTransaction(); | |
| 87 } | |
| 88 | |
| 89 sql::Connection& ArchivedDatabase::GetDB() { | |
| 90 return db_; | |
| 91 } | |
| 92 | |
| 93 // static | |
| 94 int ArchivedDatabase::GetCurrentVersion() { | |
| 95 return kCurrentVersionNumber; | |
| 96 } | |
| 97 | |
| 98 // Migration ------------------------------------------------------------------- | |
| 99 | |
| 100 sql::InitStatus ArchivedDatabase::EnsureCurrentVersion() { | |
| 101 // We can't read databases newer than we were designed for. | |
| 102 if (meta_table_.GetCompatibleVersionNumber() > kCurrentVersionNumber) { | |
| 103 LOG(WARNING) << "Archived database is too new."; | |
| 104 return sql::INIT_TOO_NEW; | |
| 105 } | |
| 106 | |
| 107 // NOTICE: If you are changing structures for things shared with the archived | |
| 108 // history file like URLs, visits, or downloads, that will need migration as | |
| 109 // well. Instead of putting such migration code in this class, it should be | |
| 110 // in the corresponding file (url_database.cc, etc.) and called from here and | |
| 111 // from the archived_database.cc. | |
| 112 | |
| 113 int cur_version = meta_table_.GetVersionNumber(); | |
| 114 if (cur_version == 1) { | |
| 115 if (!DropStarredIDFromURLs()) { | |
| 116 LOG(WARNING) << "Unable to update archived database to version 2."; | |
| 117 return sql::INIT_FAILURE; | |
| 118 } | |
| 119 ++cur_version; | |
| 120 meta_table_.SetVersionNumber(cur_version); | |
| 121 meta_table_.SetCompatibleVersionNumber( | |
| 122 std::min(cur_version, kCompatibleVersionNumber)); | |
| 123 } | |
| 124 | |
| 125 if (cur_version == 2) { | |
| 126 // This is the version prior to adding visit_source table. | |
| 127 ++cur_version; | |
| 128 meta_table_.SetVersionNumber(cur_version); | |
| 129 } | |
| 130 | |
| 131 if (cur_version == 3) { | |
| 132 // This is the version prior to adding the visit_duration field in visits | |
| 133 // database. We need to migrate the database. | |
| 134 if (!MigrateVisitsWithoutDuration()) { | |
| 135 LOG(WARNING) << "Unable to update archived database to version 4."; | |
| 136 return sql::INIT_FAILURE; | |
| 137 } | |
| 138 ++cur_version; | |
| 139 meta_table_.SetVersionNumber(cur_version); | |
| 140 } | |
| 141 | |
| 142 // Put future migration cases here. | |
| 143 | |
| 144 // When the version is too old, we just try to continue anyway, there should | |
| 145 // not be a released product that makes a database too old for us to handle. | |
| 146 LOG_IF(WARNING, cur_version < kCurrentVersionNumber) << | |
| 147 "Archived database version " << cur_version << " is too old to handle."; | |
| 148 | |
| 149 return sql::INIT_OK; | |
| 150 } | |
| 151 } // namespace history | |
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Chromium Code Reviews
Issue 235863023:
Eliminate the archived history database and clean up related code. (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src