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| Name | Lines | Functions and Methods | CRAP | Classes and Traits | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | <?php | |
| 2 | ||
| 3 | declare(strict_types=1); | |
| 4 | ||
| 5 | namespace BlueprintAU\Radiant\Database\Locks; | |
| 6 | ||
| 7 | /** | |
| 8 | * A cross-process mutual-exclusion gate for arbitrary work. | |
| 9 | * | |
| 10 | * Anything a multi-instance host must serialize — the schema `diff → apply` | |
| 11 | * loop (with `DROP TABLE` in its vocabulary), cache warmups, cron jobs that | |
| 12 | * must not overlap — needs this gate. The library ships SQL-backed adapters | |
| 13 | * for each dialect; the host decides when and what to lock, because a lock | |
| 14 | * nobody asked for is a deadlock nobody can debug. | |
| 15 | * | |
| 16 | * The host wraps its critical section: | |
| 17 | * | |
| 18 | * ``` | |
| 19 | * $lock = new PostgresLock($connection); // dialect adapter | |
| 20 | * $lock->withLock(function (): void { | |
| 21 | * // ... work that must be serialized across processes ... | |
| 22 | * }); | |
| 23 | * ``` | |
| 24 | * | |
| 25 | * Dialect adapters ship in {@see BlueprintAU\Radiant\Database\Locks}; the | |
| 26 | * default {@see NoopLock} documents that locking is the host's explicit | |
| 27 | * decision — the library never silently takes global locks a host did not | |
| 28 | * ask for. | |
| 29 | */ | |
| 30 | interface Lock | |
| 31 | { | |
| 32 | /** | |
| 33 | * Run the callback while holding the named cross-process lock. | |
| 34 | * | |
| 35 | * Implementations must block until the lock is acquired (or fail | |
| 36 | * loudly), hold it for the callback's duration, and always release it — | |
| 37 | * including on exception. The name is supplied per call, not per | |
| 38 | * adapter: one name is one mutual-exclusion domain. | |
| 39 | * | |
| 40 | * @template TReturn | |
| 41 | * | |
| 42 | * @param callable(): TReturn $callback | |
| 43 | * @param string $name A distinct name per distinct critical section. | |
| 44 | * @return TReturn | |
| 45 | * @throws \Throwable | |
| 46 | */ | |
| 47 | public function withLock(callable $callback, string $name): mixed; | |
| 48 | } |