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AphrontRequestExceptionHandler.php
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			<?php

			/**
			* React to an unhandled exception escaping request handling in a controller
			* and convert it into a response.
			*
			* These handlers are generally used to render error pages, but they may
			* also perform more specialized handling in situations where an error page
			* is not appropriate.
			*/
			abstract class AphrontRequestExceptionHandler extends Phobject {

			abstract public function getRequestExceptionHandlerPriority();

			abstract public function canHandleRequestThrowable(
			AphrontRequest $request,
			$throwable);

			abstract public function handleRequestThrowable(
			AphrontRequest $request,
			$throwable);

			final public static function getAllHandlers() {
			return id(new PhutilClassMapQuery())
			->setAncestorClass(__CLASS__)
			->setSortMethod('getRequestExceptionHandlerPriority')
			->execute();
			}

			}