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phab/src/infrastructure/daemon/workers/action/PhabricatorTriggerAction.php
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PhabricatorTriggerAction.php
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<?php
/**
* A trigger action reacts to a scheduled event.
*
* Almost all events should use a @{class:PhabricatorScheduleTaskTriggerAction}.
* Avoid introducing new actions without strong justification. See that class
* for discussion of concerns.
*/
abstract class PhabricatorTriggerAction extends Phobject {
private $properties;
public function __construct(array $properties) {
$this->validateProperties($properties);
$this->properties = $properties;
}
public function getProperties() {
return $this->properties;
}
public function getProperty($key, $default = null) {
return idx($this->properties, $key, $default);
}
/**
* Validate action configuration.
*
* @param map<string, wild> Map of action properties.
* @return void
*/
abstract public function validateProperties(array $properties);
/**
* Execute this action.
*
* IMPORTANT: Trigger actions must execute quickly!
*
* In most cases, trigger actions should queue a worker task and then exit.
* The actual trigger execution occurs in a locked section in the trigger
* daemon and blocks all other triggers. By queueing a task instead of
* performing processing directly, triggers can execute more involved actions
* without blocking other triggers.
*
* Almost all events should use @{class:PhabricatorScheduleTaskTriggerAction}
* to do this, ensuring that they execute quickly.
*
* An action may trigger a long time after it is scheduled. For example,
* a meeting reminder may be scheduled at 9:45 AM, but the action may not
* execute until later (for example, because the server was down for
* maintenance). You can detect cases like this by comparing `$this_epoch`
* (which holds the time the event was scheduled to execute at) to
* `PhabricatorTime::getNow()` (which returns the current time). In the
* case of a meeting reminder, you may want to ignore the action if it
* executes too late to be useful (for example, after a meeting is over).
*
* Because actions should normally queue a task and there may be a second,
* arbitrarily long delay between trigger execution and task execution, it
* may be simplest to pass the trigger time to the task and then make the
* decision to discard the action there.
*
* @param int|null Last time the event occurred, or null if it has never
* triggered before.
* @param int The scheduled time for the current action. This may be
* significantly different from the current time.
* @return void
*/
abstract public function execute($last_epoch, $this_epoch);
}
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