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PhabricatorGarbageCollector.php
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Sat, Nov 30, 11:46

PhabricatorGarbageCollector.php
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<?php
/**
* @task info Getting Collector Information
* @task collect Collecting Garbage
*/
abstract class PhabricatorGarbageCollector extends Phobject {
/* -( Getting Collector Information )-------------------------------------- */
/**
* Get a human readable name for what this collector cleans up, like
* "User Activity Logs".
*
* @return string Human-readable collector name.
* @task info
*/
abstract public function getCollectorName();
/**
* Specify that the collector has an automatic retention policy and
* is not configurable.
*
* @return bool True if the collector has an automatic retention policy.
* @task info
*/
public function hasAutomaticPolicy() {
return false;
}
/**
* Get the default retention policy for this collector.
*
* Return the age (in seconds) when resources start getting collected, or
* `null` to retain resources indefinitely.
*
* @return int|null Lifetime, or `null` for indefinite retention.
* @task info
*/
public function getDefaultRetentionPolicy() {
throw new PhutilMethodNotImplementedException();
}
/**
* Get the effective retention policy.
*
* @return int|null Lifetime, or `null` for indefinite retention.
* @task info
*/
public function getRetentionPolicy() {
if ($this->hasAutomaticPolicy()) {
throw new Exception(
pht(
'Can not get retention policy of collector with automatic '.
'policy.'));
}
$config = PhabricatorEnv::getEnvConfig('phd.garbage-collection');
$const = $this->getCollectorConstant();
return idx($config, $const, $this->getDefaultRetentionPolicy());
}
/**
* Get a unique string constant identifying this collector.
*
* @return string Collector constant.
* @task info
*/
final public function getCollectorConstant() {
return $this->getPhobjectClassConstant('COLLECTORCONST', 64);
}
/* -( Collecting Garbage )------------------------------------------------- */
/**
* Run the collector.
*
* @return bool True if there is more garbage to collect.
* @task collect
*/
final public function runCollector() {
// Don't do anything if this collector is configured with an indefinite
// retention policy.
if (!$this->hasAutomaticPolicy()) {
$policy = $this->getRetentionPolicy();
if (!$policy) {
return false;
}
}
// Hold a lock while performing collection to avoid racing other daemons
// running the same collectors.
$lock_name = 'gc:'.$this->getCollectorConstant();
$lock = PhabricatorGlobalLock::newLock($lock_name);
try {
$lock->lock(5);
} catch (PhutilLockException $ex) {
return false;
}
try {
$result = $this->collectGarbage();
} catch (Exception $ex) {
$lock->unlock();
throw $ex;
}
$lock->unlock();
return $result;
}
/**
* Collect garbage from whatever source this GC handles.
*
* @return bool True if there is more garbage to collect.
* @task collect
*/
abstract protected function collectGarbage();
/**
* Get the most recent epoch timestamp that is considered garbage.
*
* Records older than this should be collected.
*
* @return int Most recent garbage timestamp.
* @task collect
*/
final protected function getGarbageEpoch() {
if ($this->hasAutomaticPolicy()) {
throw new Exception(
pht(
'Can not get garbage epoch for a collector with an automatic '.
'collection policy.'));
}
$ttl = $this->getRetentionPolicy();
if (!$ttl) {
throw new Exception(
pht(
'Can not get garbage epoch for a collector with an indefinite '.
'retention policy.'));
}
return (PhabricatorTime::getNow() - $ttl);
}
/**
* Load all of the available garbage collectors.
*
* @return list<PhabricatorGarbageCollector> Garbage collectors.
* @task collect
*/
final public static function getAllCollectors() {
return id(new PhutilClassMapQuery())
->setAncestorClass(__CLASS__)
->setUniqueMethod('getCollectorConstant')
->execute();
}
}

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