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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 | |
21 | namespace MediaWiki\JobQueue; |
22 | |
23 | /** |
24 | * Job that has a run() method and metadata accessors for JobQueue::pop() and JobQueue::ack(). |
25 | * |
26 | * Instances are not only enqueueable via JobQueue::push(), but they can also be executed by |
27 | * calling their run() method. When constructing a job to be enqueued via JobQueue::push(), it |
28 | * will not be possible to construct a RunnableJob instance if the class for that job is not |
29 | * loaded by the application for the local DB domain. In that case, the general-purpose |
30 | * JobSpecification class can be used instead. |
31 | * |
32 | * See [the architecture doc](@ref jobqueuearch) for more information. |
33 | * |
34 | * @stable to implement |
35 | * @since 1.33 |
36 | * @ingroup JobQueue |
37 | */ |
38 | interface RunnableJob extends IJobSpecification { |
39 | /** @var int Job must not be wrapped in the usual explicit LBFactory transaction round */ |
40 | public const JOB_NO_EXPLICIT_TRX_ROUND = 1; |
41 | |
42 | /** |
43 | * Run the job. |
44 | * |
45 | * If this method returns `false` or completes exceptionally, the job runner will retry executing this |
46 | * job unless the number of retries has exceeded its configured retry limit. |
47 | * Retries are allowed by default, unless allowRetries() is overridden to disable retries. |
48 | * |
49 | * See [the architecture doc](@ref jobqueuearch) for more information. |
50 | * |
51 | * @return bool Return `false` to instruct the job runner to retry a failed job. |
52 | * Otherwise return `true` to indicate that a job completed |
53 | * (i.e. succeeded, or failed in a way that's deterministic or redundant). |
54 | */ |
55 | public function run(); |
56 | |
57 | /** |
58 | * @param string|null $field Metadata field or null to get all the metadata |
59 | * @return mixed|null Value; null if missing |
60 | */ |
61 | public function getMetadata( $field = null ); |
62 | |
63 | /** |
64 | * @param string $field Key name to set the value for |
65 | * @param mixed $value The value to set the field for |
66 | * @return mixed|null The prior field value; null if missing |
67 | */ |
68 | public function setMetadata( $field, $value ); |
69 | |
70 | /** |
71 | * @param int $flag JOB_* class constant |
72 | * @return bool |
73 | * @since 1.31 |
74 | */ |
75 | public function hasExecutionFlag( $flag ); |
76 | |
77 | /** |
78 | * @return string|null Id of the request that created this job. Follows |
79 | * jobs recursively, allowing to track the id of the request that started a |
80 | * job when jobs insert jobs which insert other jobs. |
81 | * @since 1.27 |
82 | */ |
83 | public function getRequestId(); |
84 | |
85 | /** |
86 | * Whether to retry execution of this job if run() returned `false` or threw an exception. |
87 | * |
88 | * @warning In some setups (i.e. when using change-propagation) jobs may |
89 | * still be retried even when this is false if the job fails due to a |
90 | * timeout unless it is also configured in change-prop config (T358939). |
91 | * @return bool Whether this job can be retried on failure by job runners |
92 | * @since 1.21 |
93 | */ |
94 | public function allowRetries(); |
95 | |
96 | /** |
97 | * @return int Number of actually "work items" handled in this job |
98 | * @see $wgJobBackoffThrottling |
99 | * @since 1.23 |
100 | */ |
101 | public function workItemCount(); |
102 | |
103 | /** |
104 | * @return int|null UNIX timestamp of when the job was runnable, or null |
105 | * @since 1.26 |
106 | */ |
107 | public function getReadyTimestamp(); |
108 | |
109 | /** |
110 | * Do any final cleanup after run(), deferred updates, and all DB commits happen |
111 | * @param bool $status Whether the job, its deferred updates, and DB commit all succeeded |
112 | * @since 1.27 |
113 | */ |
114 | public function tearDown( $status ); |
115 | |
116 | /** |
117 | * @return string |
118 | */ |
119 | public function getLastError(); |
120 | |
121 | /** |
122 | * @return string Debugging string describing the job |
123 | */ |
124 | public function toString(); |
125 | } |
126 | |
127 | /** @deprecated class alias since 1.44 */ |
128 | class_alias( RunnableJob::class, 'RunnableJob' ); |