/**
* @since 2.0.0
*/
import type * as Effect from "./Effect.js";
import type { Pipeable } from "./Pipeable.js";
import type * as Queue from "./Queue.js";
import type * as Scope from "./Scope.js";
/**
* A `PubSub<A>` is an asynchronous message hub into which publishers can publish
* messages of type `A` and subscribers can subscribe to take messages of type
* `A`.
*
* @since 2.0.0
* @category models
*/
export interface PubSub<in out A> extends Queue.Enqueue<A>, Pipeable {
/**
* Publishes a message to the `PubSub`, returning whether the message was published
* to the `PubSub`.
*/
publish(value: A): Effect.Effect<boolean>;
/**
* Publishes all of the specified messages to the `PubSub`, returning whether they
* were published to the `PubSub`.
*/
publishAll(elements: Iterable<A>): Effect.Effect<boolean>;
/**
* Subscribes to receive messages from the `PubSub`. The resulting subscription can
* be evaluated multiple times within the scope to take a message from the `PubSub`
* each time.
*/
readonly subscribe: Effect.Effect<Queue.Dequeue<A>, never, Scope.Scope>;
}
/**
* Creates a bounded `PubSub` with the back pressure strategy. The `PubSub` will retain
* messages until they have been taken by all subscribers, applying back
* pressure to publishers if the `PubSub` is at capacity.
*
* For best performance use capacities that are powers of two.
*
* @since 2.0.0
* @category constructors
*/
export declare const bounded: <A>(capacity: number | {
readonly capacity: number;
readonly replay?: number | undefined;
}) => Effect.Effect<PubSub<A>>;
/**
* Creates a bounded `PubSub` with the dropping strategy. The `PubSub` will drop new
* messages if the `PubSub` is at capacity.
*
* For best performance use capacities that are powers of two.
*
* @since 2.0.0
* @category constructors
*/
export declare const dropping: <A>(capacity: number | {
readonly capacity: number;
readonly replay?: number | undefined;
}) => Effect.Effect<PubSub<A>>;
/**
* Creates a bounded `PubSub` with the sliding strategy. The `PubSub` will add new
* messages and drop old messages if the `PubSub` is at capacity.
*
* For best performance use capacities that are powers of two.
*
* @since 2.0.0
* @category constructors
*/
export declare const sliding: <A>(capacity: number | {
readonly capacity: number;
readonly replay?: number | undefined;
}) => Effect.Effect<PubSub<A>>;
/**
* Creates an unbounded `PubSub`.
*
* @since 2.0.0
* @category constructors
*/
export declare const unbounded: <A>(options?: {
readonly replay?: number | undefined;
}) => Effect.Effect<PubSub<A>>;
/**
* Returns the number of elements the queue can hold.
*
* @since 2.0.0
* @category getters
*/
export declare const capacity: <A>(self: PubSub<A>) => number;
/**
* Retrieves the size of the queue, which is equal to the number of elements
* in the queue. This may be negative if fibers are suspended waiting for
* elements to be added to the queue.
*
* @since 2.0.0
* @category getters
*/
export declare const size: <A>(self: PubSub<A>) => Effect.Effect<number>;
/**
* Returns `true` if the `Queue` contains at least one element, `false`
* otherwise.
*
* @since 2.0.0
* @category getters
*/
export declare const isFull: <A>(self: PubSub<A>) => Effect.Effect<boolean>;
/**
* Returns `true` if the `Queue` contains zero elements, `false` otherwise.
*
* @since 2.0.0
* @category getters
*/
export declare const isEmpty: <A>(self: PubSub<A>) => Effect.Effect<boolean>;
/**
* Interrupts any fibers that are suspended on `offer` or `take`. Future calls
* to `offer*` and `take*` will be interrupted immediately.
*
* @since 2.0.0
* @category utils
*/
export declare const shutdown: <A>(self: PubSub<A>) => Effect.Effect<void>;
/**
* Returns `true` if `shutdown` has been called, otherwise returns `false`.
*
* @since 2.0.0
* @category getters
*/
export declare const isShutdown: <A>(self: PubSub<A>) => Effect.Effect<boolean>;
/**
* Waits until the queue is shutdown. The `Effect` returned by this method will
* not resume until the queue has been shutdown. If the queue is already
* shutdown, the `Effect` will resume right away.
*
* @since 2.0.0
* @category utils
*/
export declare const awaitShutdown: <A>(self: PubSub<A>) => Effect.Effect<void>;
/**
* Publishes a message to the `PubSub`, returning whether the message was published
* to the `PubSub`.
*
* @since 2.0.0
* @category utils
*/
export declare const publish: {
/**
* Publishes a message to the `PubSub`, returning whether the message was published
* to the `PubSub`.
*
* @since 2.0.0
* @category utils
*/
<A>(value: A): (self: PubSub<A>) => Effect.Effect<boolean>;
/**
* Publishes a message to the `PubSub`, returning whether the message was published
* to the `PubSub`.
*
* @since 2.0.0
* @category utils
*/
<A>(self: PubSub<A>, value: A): Effect.Effect<boolean>;
};
/**
* Publishes all of the specified messages to the `PubSub`, returning whether they
* were published to the `PubSub`.
*
* @since 2.0.0
* @category utils
*/
export declare const publishAll: {
/**
* Publishes all of the specified messages to the `PubSub`, returning whether they
* were published to the `PubSub`.
*
* @since 2.0.0
* @category utils
*/
<A>(elements: Iterable<A>): (self: PubSub<A>) => Effect.Effect<boolean>;
/**
* Publishes all of the specified messages to the `PubSub`, returning whether they
* were published to the `PubSub`.
*
* @since 2.0.0
* @category utils
*/
<A>(self: PubSub<A>, elements: Iterable<A>): Effect.Effect<boolean>;
};
/**
* Subscribes to receive messages from the `PubSub`. The resulting subscription can
* be evaluated multiple times within the scope to take a message from the `PubSub`
* each time.
*
* @since 2.0.0
* @category utils
*/
export declare const subscribe: <A>(self: PubSub<A>) => Effect.Effect<Queue.Dequeue<A>, never, Scope.Scope>;
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