Class BoundedPubSubSingle

packages/effect/src/internal/pubsub.ts:584–660

@internal

/** @internal */
class BoundedPubSubSingle<in out A> implements AtomicPubSub<A> {
  publisherIndex = 0
  subscriberCount = 0
  subscribers = 0
  value: A = AbsentValue as unknown as A

  readonly capacity = 1
  constructor(readonly replayBuffer: ReplayBuffer<A> | undefined) {}

  replayWindow(): ReplayWindow<A> {
    return this.replayBuffer ? new ReplayWindowImpl(this.replayBuffer) : emptyReplayWindow
  }

  pipe() {
    return pipeArguments(this, arguments)
  }

  isEmpty(): boolean {
    return this.subscribers === 0
  }

  isFull(): boolean {
    return !this.isEmpty()
  }

  size(): number {
    return this.isEmpty() ? 0 : 1
  }

  publish(value: A): boolean {
    if (this.isFull()) {
      return false
    }
    if (this.subscriberCount !== 0) {
      this.value = value
      this.subscribers = this.subscriberCount
      this.publisherIndex += 1
    }
    if (this.replayBuffer) {
      this.replayBuffer.offer(value)
    }
    return true
  }

  publishAll(elements: Iterable<A>): Chunk.Chunk<A> {
    if (this.subscriberCount === 0) {
      if (this.replayBuffer) {
        this.replayBuffer.offerAll(elements)
      }
      return Chunk.empty()
    }
    const chunk = Chunk.fromIterable(elements)
    if (Chunk.isEmpty(chunk)) {
      return chunk
    }
    if (this.publish(Chunk.unsafeHead(chunk))) {
      return Chunk.drop(chunk, 1)
    } else {