Class UnboundedPubSub

packages/effect/src/internal/pubsub.ts:731–808

@internal

/** @internal */
class UnboundedPubSub<in out A> implements AtomicPubSub<A> {
  publisherHead: Node<A> = {
    value: AbsentValue,
    subscribers: 0,
    next: null
  }
  publisherTail = this.publisherHead
  publisherIndex = 0
  subscribersIndex = 0

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

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

  isEmpty(): boolean {
    return this.publisherHead === this.publisherTail
  }

  isFull(): boolean {
    return false
  }

  size(): number {
    return this.publisherIndex - this.subscribersIndex
  }

  publish(value: A): boolean {
    const subscribers = this.publisherTail.subscribers
    if (subscribers !== 0) {
      this.publisherTail.next = {
        value,
        subscribers,
        next: null
      }
      this.publisherTail = this.publisherTail.next
      this.publisherIndex += 1
    }
    if (this.replayBuffer) {
      this.replayBuffer.offer(value)
    }
    return true
  }

  publishAll(elements: Iterable<A>): Chunk.Chunk<A> {
    if (this.publisherTail.subscribers !== 0) {
      for (const a of elements) {
        this.publish(a)
      }
    } else if (this.replayBuffer) {
      this.replayBuffer.offerAll(elements)
    }
    return Chunk.empty()
  }

  slide(): void {