PhabricatorTaskmasterDaemon.php
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	<?php

	final class PhabricatorTaskmasterDaemon extends PhabricatorDaemon {

	protected function run() {
	do {
	PhabricatorCaches::destroyRequestCache();

	$tasks = id(new PhabricatorWorkerLeaseQuery())
	->setLimit(1)
	->execute();

	if ($tasks) {
	$this->willBeginWork();

	foreach ($tasks as $task) {
	$id = $task->getID();
	$class = $task->getTaskClass();

	$this->log(pht('Working on task %d (%s)...', $id, $class));

	$task = $task->executeTask();
	$ex = $task->getExecutionException();
	if ($ex) {
	if ($ex instanceof PhabricatorWorkerPermanentFailureException) {
	throw new PhutilProxyException(
	pht('Permanent failure while executing Task ID %d.', $id),
	$ex);
	} else if ($ex instanceof PhabricatorWorkerYieldException) {
	$this->log(pht('Task %s yielded.', $id));
	} else {
	$this->log("Task {$id} failed!");
	throw new PhutilProxyException(
	pht('Error while executing Task ID %d.', $id),
	$ex);
	}
	} else {
	$this->log(pht('Task %s complete! Moved to archive.', $id));
	}
	}

	$sleep = 0;
	} else {
	// When there's no work, sleep for one second. The pool will
	// autoscale down if we're continuously idle for an extended period
	// of time.
	$this->willBeginIdle();
	$sleep = 1;
	}

	$this->sleep($sleep);
	} while (!$this->shouldExit());
	}

	}