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PhabricatorWorker.php
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Mon, Jul 14, 18:48

PhabricatorWorker.php
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<?php
/*
* Copyright 2012 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @task config Configuring Retries and Failures
*
* @group worker
*/
abstract class PhabricatorWorker {
private $data;
/* -( Configuring Retries and Failures )----------------------------------- */
/**
* Return the number of seconds this worker needs hold a lease on the task for
* while it performs work. For most tasks you can leave this at `null`, which
* will give you a short default lease (currently 60 seconds).
*
* For tasks which may take a very long time to complete, you should return
* an upper bound on the amount of time the task may require.
*
* @return int|null Number of seconds this task needs to remain leased for,
* or null for a default (currently 60 second) lease.
*
* @task config
*/
public function getRequiredLeaseTime() {
return null;
}
/**
* Return the maximum number of times this task may be retried before it
* is considered permanently failed. By default, tasks retry indefinitely. You
* can throw a @{class:PhabricatorWorkerPermanentFailureException} to cause an
* immediate permanent failure.
*
* @return int|null Number of times the task will retry before permanent
* failure. Return `null` to retry indefinitely.
*
* @task config
*/
public function getMaximumRetryCount() {
return null;
}
/**
* Return the number of seconds a task should wait after a failure before
* retrying. For most tasks you can leave this at `null`, which will give you
* a short default retry period (currently 60 seconds).
*
* @param PhabricatorWorkerTask The task itself. This object is probably
* useful mostly to examine the failure
* count if you want to implement staggered
* retries, or to examine the execution
* exception if you want to react to
* different failures in different ways.
* @param Exception The exception which caused the failure.
* @return int|null Number of seconds to wait between retries,
* or null for a default retry period
* (currently 60 seconds).
*
* @task config
*/
public function getWaitBeforeRetry(PhabricatorWorkerTask $task) {
return null;
}
abstract protected function doWork();
final public function __construct($data) {
$this->data = $data;
}
final protected function getTaskData() {
return $this->data;
}
final public function executeTask() {
$this->doWork();
}
final public static function scheduleTask($task_class, $data) {
return id(new PhabricatorWorkerActiveTask())
->setTaskClass($task_class)
->setData($data)
->save();
}
}

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