| 17 | } |
| 18 | |
| 19 | export class ResourceRef<A, E = never> { |
| 20 | static from = Effect.fnUntraced(function*<A, E>( |
| 21 | parentScope: Scope.Scope, |
| 22 | acquire: (scope: Scope.Scope) => Effect.Effect<A, E> |
| 23 | ) { |
| 24 | const state = MutableRef.make<State<A>>({ _tag: "Closed" }) |
| 25 | |
| 26 | yield* Scope.addFinalizerExit(parentScope, (exit) => { |
| 27 | const s = MutableRef.get(state) |
| 28 | if (s._tag === "Closed") { |
| 29 | return Effect.void |
| 30 | } |
| 31 | const scope = s.scope |
| 32 | MutableRef.set(state, { _tag: "Closed" }) |
| 33 | return Scope.close(scope, exit) |
| 34 | }) |
| 35 | |
| 36 | const scope = yield* Scope.make() |
| 37 | MutableRef.set(state, { _tag: "Acquiring", scope }) |
| 38 | const value = yield* acquire(scope) |
| 39 | MutableRef.set(state, { _tag: "Acquired", scope, value }) |
| 40 | |
| 41 | return new ResourceRef(state, acquire) |
| 42 | }) |
| 43 | |
| 44 | constructor( |
| 45 | readonly state: MutableRef.MutableRef<State<A>>, |
| 46 | readonly acquire: (scope: Scope.Scope) => Effect.Effect<A, E> |
| 47 | ) {} |
| 48 | |
| 49 | latch = Effect.unsafeMakeLatch(true) |
| 50 | |
| 51 | unsafeGet(): Option.Option<A> { |
| 52 | if (this.state.current._tag === "Acquired") { |
| 53 | return Option.some(this.state.current.value) |
| 54 | } |
| 55 | return Option.none() |
| 56 | } |
| 57 | |
| 58 | unsafeRebuild(): Effect.Effect<void, E> { |
| 59 | const s = this.state.current |
| 60 | if (s._tag === "Closed") { |
| 61 | return Effect.interrupt |
| 62 | } |
| 63 | const prevScope = s.scope |
| 64 | const scope = Effect.runSync(Scope.make()) |
| 65 | this.latch.unsafeClose() |
| 66 | MutableRef.set(this.state, { _tag: "Acquiring", scope }) |
| 67 | return Effect.fiberIdWith((fiberId) => { |
| 68 | internalInterruptors.add(fiberId) |
| 69 | return Scope.close(prevScope, Exit.void) |
| 70 | }).pipe( |
| 71 | Effect.andThen(this.acquire(scope)), |
| 72 | Effect.flatMap((value) => { |
| 73 | if (this.state.current._tag === "Closed") { |
| 74 | return Effect.interrupt |
| 75 | } |
| 76 | MutableRef.set(this.state, { _tag: "Acquired", scope, value }) |