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Just a generalized cache workflow
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| <?php | |
| final class Cacheable { | |
| /** | |
| * fn($keys) | |
| */ | |
| private $search; | |
| /** | |
| * fn($hits, $keys) | |
| */ | |
| private $diff; | |
| /** | |
| * fn($diff) | |
| */ | |
| private $hydrate; | |
| /** | |
| * fn($new) | |
| */ | |
| private $store; | |
| public function __construct( | |
| callable $search, | |
| callable $diff, | |
| callable $hydrate, | |
| callable $store | |
| ) { | |
| $this->search = $search; | |
| $this->diff = $diff; | |
| $this->hydrate = $hydrate; | |
| $this->store = $store; | |
| } | |
| public function run(array $keys): array { | |
| $hits = ($this->search)($keys); | |
| $diff = ($this->diff)($hits, $keys); | |
| if (empty($diff)) { | |
| return $hits; | |
| } | |
| $new = ($this->hydrate)($diff); | |
| if (empty($new)) { | |
| return $hits; | |
| } else { | |
| ($this->store)($new); | |
| } | |
| return array_merge($hits, $new); | |
| } | |
| } | |
| class CacheableTestSuite { | |
| private $search; | |
| private $diff; | |
| private $hydrate; | |
| private $store; | |
| private $save; | |
| function setUp(): self { | |
| $cached = [ | |
| 'a' =>['foo', 'bar'], | |
| 'c' =>['John', 'Doe'], | |
| ]; | |
| $stored = [ | |
| 'a' =>['foo', 'bar'], | |
| 'b' =>['Jane', 'Johnson'], | |
| 'c' =>['John', 'Doe'], | |
| ]; | |
| $this->search = fn($keys) => array_filter( | |
| $cached, | |
| fn($key) => in_array($key, $keys), | |
| ARRAY_FILTER_USE_KEY | |
| ); | |
| $this->diff = fn($hits, $keys) => array_filter( | |
| $keys, | |
| fn($key) => !array_key_exists($key, $hits) | |
| ); | |
| $this->hydrate = fn($diff) => array_filter( | |
| $stored, | |
| fn($key) => in_array($key, $diff), | |
| ARRAY_FILTER_USE_KEY | |
| ); | |
| $this->store = function($new) { | |
| foreach ($new as $key => $value) { | |
| $this->save[$key] = $value; | |
| } | |
| }; | |
| $this->save = []; | |
| return $this; | |
| } | |
| function testTwoHitsOneMiss() { | |
| $save = []; | |
| $results = (new Cacheable( | |
| search: $this->search, | |
| diff: $this->diff, | |
| hydrate: $this->hydrate, | |
| store: $this->store | |
| ))->run(['a', 'b']); | |
| assert(array_keys($results) == ['a', 'b']); | |
| assert(array_keys($this->save) == ['b']); | |
| } | |
| function testNotExists() { | |
| $results = (new Cacheable( | |
| search: $this->search, | |
| diff: $this->diff, | |
| hydrate: $this->hydrate, | |
| store: $this->store | |
| ))->run(['d']); | |
| assert(array_keys($results) == []); | |
| assert(array_keys($this->save) == []); | |
| } | |
| } | |
| $suite = new CacheableTestSuite(); | |
| $suite->setUp()->testTwoHitsOneMiss(); | |
| $suite->setUp()->testNotExists(); |
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