io.youi.ajax.AjaxManager.scala Maven / Gradle / Ivy

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Core functionality leveraged and shared by most other sub-projects of YouI.

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package io.youi.ajax

import io.youi.http.HttpMethod
import io.youi.net.URL
import org.scalajs.dom.XMLHttpRequest
import org.scalajs.dom.raw.FormData
import scribe.Logging

import scala.collection.immutable.Queue
import scala.concurrent.Future

class AjaxManager(val maxConcurrent: Int) extends Logging {
  private var _queue = Queue.empty[AjaxAction]
  private var _running = Set.empty[AjaxAction]

  def queue: Int = _queue.size
  def running: Int = _running.size

  def enqueue(url: URL,
              method: HttpMethod = HttpMethod.Post,
              data: Option[FormData] = None,
              timeout: Int = 0,
              headers: Map[String, String] = Map.empty,
              withCredentials: Boolean = true,
              responseType: String = ""): AjaxAction = {
    val request = new AjaxRequest(url, method, data, timeout, headers, withCredentials, responseType)
    val action = new AjaxAction(request)
    enqueue(action)
    action
  }

  def enqueue(action: AjaxAction): Future[XMLHttpRequest] = {
    _queue = _queue.enqueue(action)
    action._state @= ActionState.Enqueued
    checkQueue()
    action.future
  }

  def checkQueue(): Unit = if (_running.size < maxConcurrent && _queue.nonEmpty) {
    val (action, updated) = _queue.dequeue
    _queue = updated
    _running += action
    action.start(this)
  }

  private[ajax] def remove(action: AjaxAction): Unit = {
    _running -= action
    checkQueue()
  }
}