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DrydockBlueprint.php
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Created
Wed, Feb 5, 15:23

DrydockBlueprint.php
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<?php
abstract class DrydockBlueprint {
private $activeLease;
private $activeResource;
abstract public function getType();
abstract public function getInterface(
DrydockResource $resource,
DrydockLease $lease,
$type);
abstract public function isEnabled();
public function getBlueprintClass() {
return get_class($this);
}
public function canAllocateMoreResources(array $pool) {
return true;
}
abstract protected function executeAllocateResource(DrydockLease $lease);
abstract protected function executeAcquireLease(
DrydockResource $resource,
DrydockLease $lease);
final public function acquireLease(
DrydockResource $resource,
DrydockLease $lease) {
$this->activeResource = $resource;
$this->activeLease = $lease;
$this->log('Acquiring Lease');
try {
$this->executeAcquireLease($resource, $lease);
} catch (Exception $ex) {
$this->logException($ex);
$this->activeResource = null;
$this->activeLease = null;
throw $ex;
}
$lease->setResourceID($resource->getID());
$lease->setStatus(DrydockLeaseStatus::STATUS_ACTIVE);
$lease->save();
$this->activeResource = null;
$this->activeLease = null;
}
protected function logException(Exception $ex) {
$this->log($ex->getMessage());
}
protected function log($message) {
self::writeLog(
$this->activeResource,
$this->activeLease,
$message);
}
public static function writeLog(
DrydockResource $resource = null,
DrydockLease $lease = null,
$message) {
$log = id(new DrydockLog())
->setEpoch(time())
->setMessage($message);
if ($resource) {
$log->setResourceID($resource->getID());
}
if ($lease) {
$log->setLeaseID($lease->getID());
}
$log->save();
}
final public function allocateResource(DrydockLease $lease) {
$this->activeLease = $lease;
$this->activeResource = null;
$this->log(
pht(
"Blueprint '%s': Allocating Resource for '%s'",
$this->getBlueprintClass(),
$lease->getLeaseName()));
try {
$resource = $this->executeAllocateResource($lease);
$this->validateAllocatedResource($resource);
} catch (Exception $ex) {
$this->logException($ex);
$this->activeResource = null;
throw $ex;
}
return $resource;
}
public static function getAllBlueprints() {
static $list = null;
if ($list === null) {
$blueprints = id(new PhutilSymbolLoader())
->setType('class')
->setAncestorClass('DrydockBlueprint')
->setConcreteOnly(true)
->selectAndLoadSymbols();
$list = ipull($blueprints, 'name', 'name');
foreach ($list as $class_name => $ignored) {
$list[$class_name] = newv($class_name, array());
}
}
return $list;
}
public static function getAllBlueprintsForResource($type) {
static $groups = null;
if ($groups === null) {
$groups = mgroup(self::getAllBlueprints(), 'getType');
}
return idx($groups, $type, array());
}
protected function newResourceTemplate($name) {
$resource = new DrydockResource();
$resource->setBlueprintClass($this->getBlueprintClass());
$resource->setType($this->getType());
$resource->setStatus(DrydockResourceStatus::STATUS_PENDING);
$resource->setName($name);
$resource->save();
$this->activeResource = $resource;
$this->log(
pht(
"Blueprint '%s': Created New Template",
$this->getBlueprintClass()));
return $resource;
}
/**
* Sanity checks that the blueprint is implemented properly.
*/
private function validateAllocatedResource($resource) {
$blueprint = $this->getBlueprintClass();
if (!($resource instanceof DrydockResource)) {
throw new Exception(
"Blueprint '{$blueprint}' is not properly implemented: ".
"executeAllocateResource() must return an object of type ".
"DrydockResource or throw, but returned something else.");
}
$current_status = $resource->getStatus();
$req_status = DrydockResourceStatus::STATUS_OPEN;
if ($current_status != $req_status) {
$current_name = DrydockResourceStatus::getNameForStatus($current_status);
$req_name = DrydockResourceStatus::getNameForStatus($req_status);
throw new Exception(
"Blueprint '{$blueprint}' is not properly implemented: ".
"executeAllocateResource() must return a DrydockResource with ".
"status '{$req_name}', but returned one with status ".
"'{$current_name}'.");
}
}
}

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