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using ARMeilleure.Diagnostics;
using ARMeilleure.State;
using System;
using System.Collections.Generic;
using System.Threading;
namespace ARMeilleure.Translation
{
/// <summary>
/// Represents a queue of <see cref="RejitRequest"/>.
/// </summary>
/// <remarks>
/// This does not necessarily behave like a queue, i.e: a FIFO collection.
/// </remarks>
sealed class TranslatorQueue : IDisposable
{
private bool _disposed;
private readonly Stack<RejitRequest> _requests;
private readonly HashSet<ulong> _requestAddresses;
/// <summary>
/// Gets the object used to synchronize access to the <see cref="TranslatorQueue"/>.
/// </summary>
public object Sync { get; }
/// <summary>
/// Gets the number of requests in the <see cref="TranslatorQueue"/>.
/// </summary>
public int Count => _requests.Count;
/// <summary>
/// Initializes a new instance of the <see cref="TranslatorQueue"/> class.
/// </summary>
public TranslatorQueue()
{
Sync = new object();
_requests = new Stack<RejitRequest>();
_requestAddresses = new HashSet<ulong>();
}
/// <summary>
/// Enqueues a request with the specified <paramref name="address"/> and <paramref name="mode"/>.
/// </summary>
/// <param name="address">Address of request</param>
/// <param name="mode"><see cref="ExecutionMode"/> of request</param>
public void Enqueue(ulong address, ExecutionMode mode)
{
lock (Sync)
{
if (_requestAddresses.Add(address))
{
_requests.Push(new RejitRequest(address, mode));
TranslatorEventSource.Log.RejitQueueAdd(1);
Monitor.Pulse(Sync);
}
}
}
/// <summary>
/// Tries to dequeue a <see cref="RejitRequest"/>. This will block the thread until a <see cref="RejitRequest"/>
/// is enqueued or the <see cref="TranslatorQueue"/> is disposed.
/// </summary>
/// <param name="result"><see cref="RejitRequest"/> dequeued</param>
/// <returns><see langword="true"/> on success; otherwise <see langword="false"/></returns>
public bool TryDequeue(out RejitRequest result)
{
while (!_disposed)
{
lock (Sync)
{
if (_requests.TryPop(out result))
{
_requestAddresses.Remove(result.Address);
TranslatorEventSource.Log.RejitQueueAdd(-1);
return true;
}
if (!_disposed)
{
Monitor.Wait(Sync);
}
}
}
result = default;
return false;
}
/// <summary>
/// Clears the <see cref="TranslatorQueue"/>.
/// </summary>
public void Clear()
{
lock (Sync)
{
TranslatorEventSource.Log.RejitQueueAdd(-_requests.Count);
_requests.Clear();
_requestAddresses.Clear();
Monitor.PulseAll(Sync);
}
}
/// <summary>
/// Releases all resources used by the <see cref="TranslatorQueue"/> instance.
/// </summary>
public void Dispose()
{
if (!_disposed)
{
_disposed = true;
Clear();
}
}
}
}
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