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phorge/src/infrastructure/daemon/workers/clock/PhabricatorTriggerClock.php
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PhabricatorTriggerClock.php
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<?php
/**
* A trigger clock implements scheduling rules for an event.
*
* Two examples of triggered events are a subscription which bills on the 12th
* of every month, or a meeting reminder which sends an email 15 minutes before
* an event. A trigger clock contains the logic to figure out exactly when
* those times are.
*
* For example, it might schedule an event every hour, or every Thursday, or on
* the 15th of every month at 3PM, or only at a specific time.
*/
abstract class PhabricatorTriggerClock 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 clock configuration.
*
* @param map<string, wild> $properties Map of clock properties.
* @return void
*/
abstract public function validateProperties(array $properties);
/**
* Get the next occurrence of this event.
*
* This method takes two parameters: the last time this event occurred (or
* null if it has never triggered before) and a flag distinguishing between
* a normal reschedule (after a successful trigger) or an update because of
* a trigger change.
*
* If this event does not occur again, return `null` to stop it from being
* rescheduled. For example, a meeting reminder may be sent only once before
* the meeting.
*
* If this event does occur again, return the epoch timestamp of the next
* occurrence.
*
* When performing routine reschedules, the event must move forward in time:
* any timestamp you return must be later than the last event. For instance,
* if this event triggers an invoice, the next invoice date must be after
* the previous invoice date. This prevents an event from looping more than
* once per second.
*
* In contrast, after an update (not a routine reschedule), the next event
* may be scheduled at any time. For example, if a meeting is moved from next
* week to 3 minutes from now, the clock may reschedule the notification to
* occur 12 minutes ago. This will cause it to execute immediately.
*
* @param int|null $last_epoch Last time the event occurred, or null if it
* has never triggered before.
* @param bool $is_reschedule True if this is a reschedule after a successful
* trigger.
* @return int|null Next event, or null to decline to reschedule.
*/
abstract public function getNextEventEpoch($last_epoch, $is_reschedule);
}

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