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PhabricatorDaemonOverseerModule.php
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			<?php

			/**
			* Overseer module.
			*
			* The primary purpose of this overseer module is to poll for configuration
			* changes and reload daemons when the configuration changes.
			*/
			final class PhabricatorDaemonOverseerModule
			extends PhutilDaemonOverseerModule {

			private $configVersion;

			public function shouldReloadDaemons() {
			if ($this->shouldThrottle('reload', 10)) {
			return false;
			}

			return $this->updateConfigVersion();
			}

			/**
			* Calculate a version number for the current Phabricator configuration.
			*
			* The version number has no real meaning and does not provide any real
			* indication of whether a configuration entry has been changed. The config
			* version is intended to be a rough indicator that "something has changed",
			* which indicates to the overseer that the daemons should be reloaded.
			*
			* @return int
			*/
			private function loadConfigVersion() {
			$conn_r = id(new PhabricatorConfigEntry())->establishConnection('r');
			return head(queryfx_one(
			$conn_r,
			'SELECT MAX(id) FROM %T',
			id(new PhabricatorConfigTransaction())->getTableName()));
			}

			/**
			* Check and update the configuration version.
			*
			* @return bool True if the daemons should restart, otherwise false.
			*/
			private function updateConfigVersion() {
			$old_version = $this->configVersion;
			$new_version = $this->loadConfigVersion();

			$this->configVersion = $new_version;

			// Don't trigger a reload if we're loading the config for the very
			// first time.
			if ($old_version === null) {
			return false;
			}

			return ($old_version != $new_version);
			}

			}