<A>(self: TxPubSub<A>): Effect.Effect<number>Returns the current number of messages across all subscriber queues (the max).
Example (Reading subscriber queue size)
import { Effect, TxPubSub, TxQueue } from "effect"
const program = Effect.gen(function*() {
const hub = yield* TxPubSub.unbounded<number>()
yield* Effect.scoped(
Effect.gen(function*() {
const sub = yield* TxPubSub.subscribe(hub)
yield* TxPubSub.publish(hub, 1)
yield* TxPubSub.publish(hub, 2)
const s = yield* TxPubSub.size(hub)
console.log(s) // 2
})
)
})getters
Source effect/TxPubSub.ts:28410 lines
export const const size: <A>(
self: TxPubSub<A>
) => Effect.Effect<number>
Returns the current number of messages across all subscriber queues (the max).
Example (Reading subscriber queue size)
import { Effect, TxPubSub, TxQueue } from "effect"
const program = Effect.gen(function*() {
const hub = yield* TxPubSub.unbounded<number>()
yield* Effect.scoped(
Effect.gen(function*() {
const sub = yield* TxPubSub.subscribe(hub)
yield* TxPubSub.publish(hub, 1)
yield* TxPubSub.publish(hub, 2)
const s = yield* TxPubSub.size(hub)
console.log(s) // 2
})
)
})
size = <function (type parameter) A in <A>(self: TxPubSub<A>): Effect.Effect<number>A>(self: TxPubSub<A>(parameter) self: {
subscribersRef: TxRef.TxRef<Array<TxQueue.TxQueue<A>>>;
shutdownRef: TxRef.TxRef<boolean>;
strategy: "bounded" | "unbounded" | "dropping" | "sliding";
capacity: number;
toString: () => string;
toJSON: () => unknown;
pipe: { <A>(this: A): A; <A, B = never>(this: A, ab: (_: A) => B): B; <A, B = never, C = never>(this: A, ab: (_: A) => B, bc: (_: B) => C): C; <A, B = never, C = never, D = never>(this: A, ab: (_: A) => B, bc: (_: B) => C, cd: (_: C) => D): D; <…;
}
interface TxPubSub<in out A>A TxPubSub represents a transactional publish/subscribe hub that broadcasts messages
to all current subscribers using Software Transactional Memory (STM) semantics.
Example (Subscribing to a transactional pub/sub)
import { Effect, TxPubSub, TxQueue } from "effect"
const program = Effect.gen(function*() {
const hub = yield* TxPubSub.unbounded<string>()
yield* Effect.scoped(
Effect.gen(function*() {
const sub = yield* TxPubSub.subscribe(hub)
yield* TxPubSub.publish(hub, "hello")
const msg = yield* TxQueue.take(sub)
console.log(msg) // "hello"
})
)
})
TxPubSub<function (type parameter) A in <A>(self: TxPubSub<A>): Effect.Effect<number>A>): import EffectEffect.type Effect.Effect = /*unresolved*/ anyEffect<number> =>
import EffectEffect.gen(function*() {
const const subscribers: Array<
TxQueue.TxQueue<A, never>
>
import TxRefTxRef.const get: <A>(
self: TxRef<A>
) => Effect.Effect<A>
Reads the current value of the TxRef.
When to use
Use to read the current value of a TxRef.
Example (Reading transactional references)
import { Effect, TxRef } from "effect"
const program = Effect.gen(function*() {
const counter = yield* TxRef.make(42)
// Read the value within a transaction
const value = yield* Effect.tx(
TxRef.get(counter)
)
console.log(value) // 42
})
get(self: TxPubSub<A>(parameter) self: {
subscribersRef: TxRef.TxRef<Array<TxQueue.TxQueue<A>>>;
shutdownRef: TxRef.TxRef<boolean>;
strategy: "bounded" | "unbounded" | "dropping" | "sliding";
capacity: number;
toString: () => string;
toJSON: () => unknown;
pipe: { <A>(this: A): A; <A, B = never>(this: A, ab: (_: A) => B): B; <A, B = never, C = never>(this: A, ab: (_: A) => B, bc: (_: B) => C): C; <A, B = never, C = never, D = never>(this: A, ab: (_: A) => B, bc: (_: B) => C, cd: (_: C) => D): D; <…;
}
TxPubSub<A>.subscribersRef: TxRef.TxRef<Array<TxQueue.TxQueue<A>>>(property) TxPubSub<A>.subscribersRef: {
version: number;
pending: Map<unknown, () => void>;
value: A;
pipe: { <A>(this: A): A; <A, B = never>(this: A, ab: (_: A) => B): B; <A, B = never, C = never>(this: A, ab: (_: A) => B, bc: (_: B) => C): C; <A, B = never, C = never, D = never>(this: A, ab: (_: A) => B, bc: (_: B) => C, cd: (_: C) => D): D; <…;
}
let maxSize: numbermaxSize = 0
for (const const queue: TxQueue.TxQueue<A, never>const queue: {
strategy: "bounded" | "unbounded" | "dropping" | "sliding";
capacity: number;
items: TxChunk.TxChunk<any>;
stateRef: TxRef.TxRef<State<any, any>>;
toString: () => string;
toJSON: () => unknown;
}
const subscribers: Array<
TxQueue.TxQueue<A, never>
>
const s: anys = yield* import TxQueueTxQueue.const size: (
self: TxQueueState
) => Effect.Effect<number>
Gets the current size of the queue.
Example (Reading queue size)
import { Effect, TxQueue } from "effect"
const program = Effect.gen(function*() {
const queue = yield* TxQueue.bounded<number>(10)
yield* TxQueue.offerAll(queue, [1, 2, 3])
const size = yield* TxQueue.size(queue)
console.log(size) // 3
})
size(const queue: TxQueue.TxQueue<A, never>const queue: {
strategy: "bounded" | "unbounded" | "dropping" | "sliding";
capacity: number;
items: TxChunk.TxChunk<any>;
stateRef: TxRef.TxRef<State<any, any>>;
toString: () => string;
toJSON: () => unknown;
}
const s: anys > let maxSize: numbermaxSize) let maxSize: numbermaxSize = const s: anys
}
return let maxSize: numbermaxSize
}).pipe(import EffectEffect.tx)Referenced by 1 symbols