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1 | <?php |
2 | /** |
3 | * This program is free software; you can redistribute it and/or modify |
4 | * it under the terms of the GNU General Public License as published by |
5 | * the Free Software Foundation; either version 2 of the License, or |
6 | * (at your option) any later version. |
7 | * |
8 | * This program is distributed in the hope that it will be useful, |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
11 | * GNU General Public License for more details. |
12 | * |
13 | * You should have received a copy of the GNU General Public License along |
14 | * with this program; if not, write to the Free Software Foundation, Inc., |
15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
16 | * http://www.gnu.org/copyleft/gpl.html |
17 | * |
18 | * @file |
19 | */ |
20 | namespace Wikimedia\Rdbms; |
21 | |
22 | use Exception; |
23 | |
24 | /** |
25 | * Internal interface for LoadBalancer methods used by LBFactory |
26 | * |
27 | * Used by untracked objects returned from newMainLB(). |
28 | * |
29 | * @internal |
30 | * @since 1.39 |
31 | * @ingroup Database |
32 | */ |
33 | interface ILoadBalancerForOwner extends ILoadBalancer { |
34 | /** Manager of ILoadBalancer instances is running post-commit callbacks */ |
35 | public const STAGE_POSTCOMMIT_CALLBACKS = 'stage-postcommit-callbacks'; |
36 | /** Manager of ILoadBalancer instances is running post-rollback callbacks */ |
37 | public const STAGE_POSTROLLBACK_CALLBACKS = 'stage-postrollback-callbacks'; |
38 | |
39 | /** |
40 | * @param array $params Parameter map with keys: |
41 | * - servers : List of server configuration maps, starting with either the global master |
42 | * or local datacenter multi-master, and optionally followed by local datacenter replicas. |
43 | * Each server configuration map has the same format as the Database::factory() $params |
44 | * argument, with the following additional optional fields: |
45 | * - type: the DB type (sqlite, mysql, postgres,...) |
46 | * - groupLoads: map of (group => weight for this server) [optional] |
47 | * - max lag: per-server override of the "max lag" [optional] |
48 | * - is static: whether the dataset is static *and* this server has a copy [optional] |
49 | * - localDomain: A DatabaseDomain or domain ID string |
50 | * - loadMonitor : LoadMonitor::__construct() parameters with "class" field [optional] |
51 | * - readOnlyReason : Reason the primary server is read-only (false if not) [optional] |
52 | * - srvCache : BagOStuff object for server cache [optional] |
53 | * - wanCache : WANObjectCache object [optional] |
54 | * - databaseFactory: DatabaseFactory object [optional] |
55 | * - chronologyProtector: ChronologyProtector object [optional] |
56 | * - defaultGroup: Default query group; the generic group if not specified [optional] |
57 | * - hostname : The name of the current server [optional] |
58 | * - cliMode: Whether the execution context is a CLI script [optional] |
59 | * - profiler : Callback that takes a section name argument and returns |
60 | * a ScopedCallback instance that ends the profile section in its destructor [optional] |
61 | * - trxProfiler: TransactionProfiler instance [optional] |
62 | * - logger: PSR-3 logger instance [optional] |
63 | * - errorLogger : Callback that takes an Exception and logs it [optional] |
64 | * - deprecationLogger: Callback to log a deprecation warning [optional] |
65 | * - roundStage: STAGE_POSTCOMMIT_* class constant; for internal use [optional] |
66 | * - clusterName: The name of the overall (single/multi-datacenter) cluster of servers |
67 | * managing the dataset, regardless of 'servers' excluding replicas and |
68 | * multi-masters from remote datacenter [optional] |
69 | * - criticalSectionProvider: CriticalSectionProvider instance [optional] |
70 | */ |
71 | public function __construct( array $params ); |
72 | |
73 | /** |
74 | * Close all connections and disable this load balancer |
75 | * |
76 | * Any attempt to open a new connection will result in a DBAccessError. |
77 | * |
78 | * @param string $fname Caller name |
79 | */ |
80 | public function disable( $fname = __METHOD__ ); |
81 | |
82 | /** |
83 | * Close all open connections |
84 | * |
85 | * @param string $fname Caller name |
86 | * |
87 | */ |
88 | public function closeAll( $fname = __METHOD__ ); |
89 | |
90 | /** |
91 | * Run pre-commit callbacks and defer execution of post-commit callbacks |
92 | * |
93 | * Use this only for multi-database commits |
94 | * |
95 | * @param string $fname Caller name |
96 | * @return int Number of pre-commit callbacks run (since 1.32) |
97 | * @since 1.37 |
98 | */ |
99 | public function finalizePrimaryChanges( $fname = __METHOD__ ); |
100 | |
101 | /** |
102 | * Perform all pre-commit checks for things like replication safety |
103 | * |
104 | * Use this only for multi-database commits |
105 | * |
106 | * @param int $maxWriteDuration : max write query duration time in seconds |
107 | * @param string $fname Caller name |
108 | * @throws DBTransactionError |
109 | * @since 1.37 |
110 | */ |
111 | public function approvePrimaryChanges( int $maxWriteDuration, $fname = __METHOD__ ); |
112 | |
113 | /** |
114 | * Flush any primary transaction snapshots and set DBO_TRX (if DBO_DEFAULT is set) |
115 | * |
116 | * The DBO_TRX setting will be reverted to the default in each of these methods: |
117 | * - commitPrimaryChanges() |
118 | * - rollbackPrimaryChanges() |
119 | * This allows for custom transaction rounds from any outer transaction scope. |
120 | * |
121 | * @param string $fname Caller name |
122 | * @throws DBExpectedError |
123 | * @since 1.37 |
124 | */ |
125 | public function beginPrimaryChanges( $fname = __METHOD__ ); |
126 | |
127 | /** |
128 | * Issue COMMIT on all open primary connections to flush changes and view snapshots |
129 | * @param string $fname Caller name |
130 | * @throws DBExpectedError |
131 | * @since 1.37 |
132 | */ |
133 | public function commitPrimaryChanges( $fname = __METHOD__ ); |
134 | |
135 | /** |
136 | * Consume and run all pending post-COMMIT/ROLLBACK callbacks and commit dangling transactions |
137 | * |
138 | * @param string $fname Caller name |
139 | * @return Exception|null The first exception or null if there were none |
140 | * @since 1.37 |
141 | */ |
142 | public function runPrimaryTransactionIdleCallbacks( $fname = __METHOD__ ); |
143 | |
144 | /** |
145 | * Run all recurring post-COMMIT/ROLLBACK listener callbacks |
146 | * |
147 | * @param string $fname Caller name |
148 | * @return Exception|null The first exception or null if there were none |
149 | * @since 1.37 |
150 | */ |
151 | public function runPrimaryTransactionListenerCallbacks( $fname = __METHOD__ ); |
152 | |
153 | /** |
154 | * Issue ROLLBACK only on primary, only if queries were done on connection |
155 | * |
156 | * @param string $fname Caller name |
157 | * @throws DBExpectedError |
158 | * @since 1.37 |
159 | */ |
160 | public function rollbackPrimaryChanges( $fname = __METHOD__ ); |
161 | |
162 | /** |
163 | * Release/destroy session-level named locks, table locks, and temp tables |
164 | * |
165 | * Only call this function right after calling rollbackPrimaryChanges() |
166 | * |
167 | * @param string $fname Caller name |
168 | * @throws DBExpectedError |
169 | * @since 1.38 |
170 | */ |
171 | public function flushPrimarySessions( $fname = __METHOD__ ); |
172 | |
173 | /** |
174 | * Commit all replica DB transactions so as to flush any REPEATABLE-READ or SSI snapshots |
175 | * |
176 | * @param string $fname Caller name |
177 | */ |
178 | public function flushReplicaSnapshots( $fname = __METHOD__ ); |
179 | |
180 | /** |
181 | * Commit all primary DB transactions so as to flush any REPEATABLE-READ or SSI snapshots |
182 | * |
183 | * An error will be thrown if a connection has pending writes or callbacks |
184 | * |
185 | * @param string $fname Caller name |
186 | * @since 1.37 |
187 | */ |
188 | public function flushPrimarySnapshots( $fname = __METHOD__ ); |
189 | |
190 | /** |
191 | * Get the list of callers that have pending primary changes |
192 | * |
193 | * @return string[] List of method names |
194 | * @since 1.37 |
195 | */ |
196 | public function pendingPrimaryChangeCallers(); |
197 | |
198 | /** |
199 | * Set a new table prefix for the existing local domain ID for testing |
200 | * |
201 | * @param string $prefix |
202 | * @since 1.33 |
203 | */ |
204 | public function setLocalDomainPrefix( $prefix ); |
205 | |
206 | /** |
207 | * Reconfigure using the given config array. |
208 | * If the config changed, this invalidates all existing connections. |
209 | * |
210 | * @warning This must only be called in top level code, typically via |
211 | * LBFactory::reconfigure. |
212 | * |
213 | * @since 1.39 |
214 | * |
215 | * @param array $conf A configuration array, using the same structure as |
216 | * the one passed to the LoadBalancer's constructor. |
217 | */ |
218 | public function reconfigure( array $conf ); |
219 | |
220 | /** |
221 | * Close all connection and redefine the local domain for testing or schema creation |
222 | * |
223 | * @param DatabaseDomain|string $domain |
224 | * @since 1.33 |
225 | */ |
226 | public function redefineLocalDomain( $domain ); |
227 | |
228 | /** |
229 | * @return bool Whether a primary connection is already open |
230 | * @since 1.37 |
231 | */ |
232 | public function hasPrimaryConnection(); |
233 | |
234 | /** |
235 | * Convert certain index names to alternative names before querying the DB |
236 | * |
237 | * Note that this applies to indexes regardless of the table they belong to. |
238 | * |
239 | * This can be employed when an index was renamed X => Y in code, but the new Y-named |
240 | * indexes were not yet built on all DBs. After all the Y-named ones are added by the DBA, |
241 | * the aliases can be removed, and then the old X-named indexes dropped. |
242 | * |
243 | * @param string[] $aliases |
244 | * @since 1.31 |
245 | */ |
246 | public function setIndexAliases( array $aliases ); |
247 | |
248 | /** |
249 | * Get the timestamp of the latest write query done by this thread |
250 | * @return float|false UNIX timestamp or false |
251 | * @since 1.37 |
252 | */ |
253 | public function lastPrimaryChangeTimestamp(); |
254 | |
255 | /** |
256 | * Set the primary wait position and wait for ALL replica DBs to catch up to it |
257 | * |
258 | * This method is only intended for use a throttling mechanism for high-volume updates. |
259 | * Unlike waitFor(), failure does not effect laggedReplicaUsed(). |
260 | * |
261 | * @param DBPrimaryPos $pos Primary position |
262 | * @param int|null $timeout Max seconds to wait; default is mWaitTimeout |
263 | * @return bool Success (able to connect and no timeouts reached) |
264 | */ |
265 | public function waitForAll( DBPrimaryPos $pos, $timeout = null ); |
266 | |
267 | /** |
268 | * Whether a highly "lagged" replica database connection was queried. |
269 | * |
270 | * @note This method will never cause a new DB connection |
271 | * @return bool |
272 | */ |
273 | public function laggedReplicaUsed(); |
274 | } |