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using System;
using System.Collections;
using System.Collections.Generic;
using System.Threading;
using UnityEngine;
using System.Diagnostics;
namespace Unity.Services.Lobbies.Scheduler
{
/// <summary>
/// <para>Provides the means to schedule tasks on a background thread or the
/// main thread. Also allows for creation of co-routines from classes that do
/// not inherit from MonoBehaviour.</para>
///
/// <para>This is thread safe, through it must be constructed on the main thread.
/// </para>
/// </summary>
public sealed class TaskSchedulerWebGL : TaskScheduler
{
private Queue<Action> m_mainThreadTaskQueue = new Queue<Action>();
/// <summary>
/// Schedules a new task on a background thread.
/// NOTE: In WebGL, multi-threading isn't supported, so this will be scheduled on main thread instead.
/// </summary>
///
/// <param name="task">The task that should be executed on a background thread.</param>
public override void ScheduleBackgroundTask(Action task)
{
ScheduleMainThreadTask(task);
}
/// <summary>
/// Determines whether the current thread is the main thread.
/// WebGL currently runs on a single thread, so this will always be false.
/// </summary>
///
/// <returns>Whether or not this thread is the main thread.</returns>
public override bool IsMainThread()
{
return false;
}
/// <summary>
/// Schedules a new task on the main thread. The task will be executed during the
/// next update.
/// </summary>
///
/// <param name="task">The task that should be executed on the main thread.</param>
public override void ScheduleMainThreadTask(Action task)
{
m_mainThreadTaskQueue.Enqueue(task);
}
/// <summary>
/// The update method which is called every frame. This executes any queued main
/// thread tasks.
/// </summary>
void Update()
{
var action = m_mainThreadTaskQueue.Count > 0 ? m_mainThreadTaskQueue.Dequeue() : null;
action?.Invoke();
}
}
}