DrydockBlueprint.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.
	*/

	abstract class DrydockBlueprint {

	private $activeLease;
	private $activeResource;

	abstract public function getType();
	abstract public function getInterface(
	DrydockResource $resource,
	DrydockLease $lease,
	$type);

	protected function executeAcquireLease(
	DrydockResource $resource,
	DrydockLease $lease) {
	return;
	}

	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();
	}

	public function canAllocateResources() {
	return false;
	}

	protected function executeAllocateResource(DrydockLease $lease) {
	throw new Exception("This blueprint can not allocate resources!");
	}

	final public function allocateResource(DrydockLease $lease) {
	$this->activeLease = $lease;
	$this->activeResource = null;

	$this->log('Allocating Resource');

	try {
	$resource = $this->executeAllocateResource($lease);
	} 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();
	$resource->setBlueprintClass(get_class($this));
	$resource->setType($this->getType());
	$resource->setStatus(DrydockResourceStatus::STATUS_PENDING);
	$resource->setName($name);
	$resource->save();

	$this->activeResource = $resource;
	$this->log('New Template');

	return $resource;
	}


	}

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