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PhabricatorClusterExceptionHandler.php
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			<?php

			final class PhabricatorClusterExceptionHandler
			extends PhabricatorRequestExceptionHandler {

			public function getRequestExceptionHandlerPriority() {
			return 300000;
			}

			public function getRequestExceptionHandlerDescription() {
			return pht('Handles runtime problems with cluster configuration.');
			}

			public function canHandleRequestThrowable(
			AphrontRequest $request,
			$throwable) {
			return ($throwable instanceof PhabricatorClusterException);
			}

			public function handleRequestThrowable(
			AphrontRequest $request,
			$throwable) {

			$viewer = $this->getViewer($request);

			$title = $throwable->getExceptionTitle();

			$dialog = id(new AphrontDialogView())
			->setTitle($title)
			->setUser($viewer)
			->appendParagraph($throwable->getMessage())
			->addCancelButton('/', pht('Proceed With Caution'));

			return id(new AphrontDialogResponse())
			->setDialog($dialog)
			->setHTTPResponseCode(500);
			}

			}