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| 1 | <?php |
| 2 | |
| 3 | namespace Wikibase\MediaInfo\Search; |
| 4 | |
| 5 | class MediaSearchMemoryEntitiesFetcher extends MediaSearchEntitiesFetcher { |
| 6 | /** @var MediaSearchEntitiesFetcher */ |
| 7 | protected $fetcher; |
| 8 | |
| 9 | /** @var array */ |
| 10 | protected static $cache = []; |
| 11 | |
| 12 | public function __construct( MediaSearchEntitiesFetcher $fetcher ) { |
| 13 | $this->fetcher = $fetcher; |
| 14 | } |
| 15 | |
| 16 | /** |
| 17 | * This is a wrapper around fetch, where the actual data is fetched. |
| 18 | * This simply reads from/writes to 2 intermediate caching levels: |
| 19 | * - in a property to allow for repeated calls within the same execution thread |
| 20 | * - in a separate key-value store, for follow-up requests (e.g. loading next |
| 21 | * batch of results for the same term) |
| 22 | * |
| 23 | * @param array $searchQueries |
| 24 | * @return array |
| 25 | */ |
| 26 | public function get( array $searchQueries ): array { |
| 27 | $emptyData = array_fill_keys( $searchQueries, [] ); |
| 28 | |
| 29 | // fetch from memory, in case it was already requested in this process |
| 30 | $fromMemory = array_intersect_key( static::$cache, $emptyData ); |
| 31 | |
| 32 | // fetch remaining queries from cache |
| 33 | $queriesToFetch = array_keys( array_diff_key( $emptyData, $fromMemory ) ); |
| 34 | $results = $this->fetcher->get( $queriesToFetch ); |
| 35 | |
| 36 | // store in memory |
| 37 | static::$cache += $results; |
| 38 | |
| 39 | return $fromMemory + $results + $emptyData; |
| 40 | } |
| 41 | } |