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PhabricatorFaviconRefQuery.php
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			<?php

			final class PhabricatorFaviconRefQuery extends Phobject {

			private $refs;

			public function withRefs(array $refs) {
			assert_instances_of($refs, 'PhabricatorFaviconRef');
			$this->refs = $refs;
			return $this;
			}

			public function execute() {
			$viewer = PhabricatorUser::getOmnipotentUser();

			$refs = $this->refs;

			$config_digest = PhabricatorFaviconRef::newConfigurationDigest();

			$ref_map = array();
			foreach ($refs as $ref) {
			$ref_digest = $ref->newDigest();
			$ref_key = "favicon({$config_digest},{$ref_digest},8)";

			$ref
			->setViewer($viewer)
			->setCacheKey($ref_key);

			$ref_map[$ref_key] = $ref;
			}

			$cache = PhabricatorCaches::getImmutableCache();
			$ref_hits = $cache->getKeys(array_keys($ref_map));

			foreach ($ref_hits as $ref_key => $ref_uri) {
			$ref_map[$ref_key]->setURI($ref_uri);
			unset($ref_map[$ref_key]);
			}

			if ($ref_map) {
			$new_map = array();
			foreach ($ref_map as $ref_key => $ref) {
			$ref_uri = $ref->newURI();
			$ref->setURI($ref_uri);
			$new_map[$ref_key] = $ref_uri;
			}

			$cache->setKeys($new_map);
			}

			return $refs;
			}


			}