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HarbormasterBuildWorker.php
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			<?php

			/**
			* Start a build.
			*/
			final class HarbormasterBuildWorker extends HarbormasterWorker {

			public function renderForDisplay(PhabricatorUser $viewer) {
			try {
			$build = $this->loadBuild();
			} catch (Exception $ex) {
			return null;
			}

			return $viewer->renderHandle($build->getPHID());
			}

			protected function doWork() {
			$viewer = $this->getViewer();

			$engine = id(new HarbormasterBuildEngine())
			->setViewer($viewer);

			$data = $this->getTaskData();
			$build_id = idx($data, 'buildID');

			if ($build_id) {
			$build = $this->loadBuild();
			$engine->setBuild($build);
			$engine->continueBuild();
			} else {
			$buildable = $this->loadBuildable();
			$engine->updateBuildable($buildable);
			}
			}

			private function loadBuild() {
			$data = $this->getTaskData();
			$id = idx($data, 'buildID');

			$viewer = $this->getViewer();
			$build = id(new HarbormasterBuildQuery())
			->setViewer($viewer)
			->withIDs(array($id))
			->executeOne();
			if (!$build) {
			throw new PhabricatorWorkerPermanentFailureException(
			pht('Invalid build ID "%s".', $id));
			}

			return $build;
			}

			private function loadBuildable() {
			$data = $this->getTaskData();
			$phid = idx($data, 'buildablePHID');

			$viewer = $this->getViewer();
			$buildable = id(new HarbormasterBuildableQuery())
			->setViewer($viewer)
			->withPHIDs(array($phid))
			->executeOne();
			if (!$buildable) {
			throw new PhabricatorWorkerPermanentFailureException(
			pht('Invalid buildable PHID "%s".', $phid));
			}

			return $buildable;
			}

			}