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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace LambdaTwelve\OneRecord\Server\InMemory; |
| 6 | |
| 7 | use DateTimeImmutable; |
| 8 | use LambdaTwelve\OneRecord\Model\LogisticsObject; |
| 9 | use LambdaTwelve\OneRecord\Rdf\Graph; |
| 10 | use LambdaTwelve\OneRecord\Rdf\Iri; |
| 11 | use LambdaTwelve\OneRecord\Server\Spi\LogisticsObjectStore; |
| 12 | use LambdaTwelve\OneRecord\Server\Spi\StoredObject; |
| 13 | use LambdaTwelve\OneRecord\Server\Spi\StoreException; |
| 14 | use LambdaTwelve\OneRecord\Server\Spi\Volatile; |
| 15 | |
| 16 | /** |
| 17 | * Every revision of every object in arrays. The reference implementation for |
| 18 | * tests and bin/serve, and the behavioural contract a database-backed store |
| 19 | * must match (see LogisticsObjectStoreContractTest). |
| 20 | */ |
| 21 | final class InMemoryLogisticsObjectStore implements LogisticsObjectStore, Volatile |
| 22 | { |
| 23 | /** @var array<string, list<array{object: LogisticsObject, at: DateTimeImmutable}>> IRI => revisions, index 0 = revision 1 */ |
| 24 | private array $revisions = []; |
| 25 | |
| 26 | public function latest(Iri $iri): ?StoredObject |
| 27 | { |
| 28 | $revisions = $this->revisions[$iri->value] ?? []; |
| 29 | |
| 30 | return $revisions === [] ? null : $this->stored($iri, \count($revisions)); |
| 31 | } |
| 32 | |
| 33 | public function revision(Iri $iri, int $revision): ?StoredObject |
| 34 | { |
| 35 | $revisions = $this->revisions[$iri->value] ?? []; |
| 36 | |
| 37 | return $revision >= 1 && $revision <= \count($revisions) ? $this->stored($iri, $revision) : null; |
| 38 | } |
| 39 | |
| 40 | public function at(Iri $iri, DateTimeImmutable $at): ?StoredObject |
| 41 | { |
| 42 | $revisions = $this->revisions[$iri->value] ?? []; |
| 43 | $found = null; |
| 44 | foreach ($revisions as $index => $entry) { |
| 45 | if ($entry['at'] <= $at) { |
| 46 | $found = $index + 1; |
| 47 | } |
| 48 | } |
| 49 | |
| 50 | return $found === null ? null : $this->stored($iri, $found); |
| 51 | } |
| 52 | |
| 53 | public function exists(Iri $iri): bool |
| 54 | { |
| 55 | return isset($this->revisions[$iri->value]); |
| 56 | } |
| 57 | |
| 58 | public function create(LogisticsObject $object, DateTimeImmutable $at): StoredObject |
| 59 | { |
| 60 | if (isset($this->revisions[$object->iri->value])) { |
| 61 | throw StoreException::alreadyExists($object->iri); |
| 62 | } |
| 63 | $this->revisions[$object->iri->value] = [['object' => self::snapshot($object), 'at' => $at]]; |
| 64 | |
| 65 | return $this->stored($object->iri, 1); |
| 66 | } |
| 67 | |
| 68 | public function saveRevision(LogisticsObject $object, int $expectedCurrent, DateTimeImmutable $at): StoredObject |
| 69 | { |
| 70 | $revisions = $this->revisions[$object->iri->value] ?? null; |
| 71 | if ($revisions === null) { |
| 72 | throw StoreException::notFound($object->iri); |
| 73 | } |
| 74 | if (\count($revisions) !== $expectedCurrent) { |
| 75 | throw StoreException::revisionConflict($object->iri, $expectedCurrent, \count($revisions)); |
| 76 | } |
| 77 | $this->revisions[$object->iri->value][] = ['object' => self::snapshot($object), 'at' => $at]; |
| 78 | |
| 79 | return $this->stored($object->iri, $expectedCurrent + 1); |
| 80 | } |
| 81 | |
| 82 | /** |
| 83 | * Graph is mutable by design (builders and the applier edit one); a stored |
| 84 | * revision must not change when a caller keeps editing the object it passed |
| 85 | * in or the one it read back (AR-015). A database store gets this for free |
| 86 | * by serialising; the reference store copies. |
| 87 | */ |
| 88 | private static function snapshot(LogisticsObject $object): LogisticsObject |
| 89 | { |
| 90 | return $object->withGraph(new Graph($object->graph)); |
| 91 | } |
| 92 | |
| 93 | public function erase(Iri $iri): void |
| 94 | { |
| 95 | unset($this->revisions[$iri->value]); |
| 96 | } |
| 97 | |
| 98 | private function stored(Iri $iri, int $revision): StoredObject |
| 99 | { |
| 100 | $revisions = $this->revisions[$iri->value]; |
| 101 | $entry = $revisions[$revision - 1]; |
| 102 | |
| 103 | return new StoredObject(self::snapshot($entry['object']), $revision, \count($revisions), $revisions[0]['at'], $entry['at']); |
| 104 | } |
| 105 | } |