export class RequestCoordinator {
  #versions = new Map()
  async run(channel, ownerId, operation) {
    const version = (this.#versions.get(channel) || 0) + 1
    this.#versions.set(channel, version)
    try {
      const value = await operation()
      return { accepted: this.#versions.get(channel) === version, ownerId, value }
    } catch (error) {
      return { accepted: this.#versions.get(channel) === version, ownerId, error }
    }
  }
  invalidate(channel) { this.#versions.set(channel, (this.#versions.get(channel) || 0) + 1) }
}