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DeferredWorkState.cs
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DeferredWorkState.cs
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using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;
namespace HotChocolate.Execution.Processing;
internal sealed class DeferredWorkState
{
private readonly object _completeSync = new();
private readonly object _deliverSync = new();
private readonly List<DeferredExecutionTaskResult> _ready = new();
private readonly Queue<IQueryResultBuilder> _deliverable = new();
private readonly HashSet<uint> _completed = new();
private SemaphoreSlim _semaphore = new(0);
private uint _taskId;
private uint _delivered;
public bool HasResults => _taskId > 0;
public uint CreateId()
{
lock (_deliverSync)
{
return ++_taskId;
}
}
public void Complete(DeferredExecutionTaskResult result)
{
lock (_completeSync)
{
if (result.ParentTaskId is 0 || _completed.Contains(result.ParentTaskId))
{
_completed.Add(result.TaskId);
EnqueueResult(result.Result);
var evaluateDeferredResults = _ready.Count > 0;
while (evaluateDeferredResults)
{
var i = 0;
evaluateDeferredResults = false;
while (_ready.Count > 0 && i < _ready.Count)
{
var current = _ready[i];
if (_completed.Contains(current.ParentTaskId))
{
_completed.Add(current.TaskId);
_ready.RemoveAt(i);
EnqueueResult(current.Result);
evaluateDeferredResults = true;
}
else
{
i++;
}
}
}
}
else
{
_ready.Add(result);
}
}
}
private void EnqueueResult(IQueryResultBuilder? queryResult)
{
if (queryResult is not null)
{
lock (_deliverSync)
{
_deliverable.Enqueue(queryResult);
}
}
_semaphore.Release();
}
public async ValueTask<IQueryResult?> TryDequeueResultAsync(
CancellationToken cancellationToken)
{
await _semaphore.WaitAsync(cancellationToken);
lock (_deliverSync)
{
while (_deliverable.Count > 0)
{
#if NETSTANDARD2_0
if (_deliverable.Count > 0)
{
var result = _deliverable.Dequeue();
#else
if (_deliverable.TryDequeue(out var result))
{
#endif
if (++_delivered == _taskId)
{
_semaphore.Release();
result.SetHasNext(false);
}
else
{
result.SetHasNext(true);
}
return result.Create();
}
if (++_delivered == _taskId)
{
return new QueryResult(null, hasNext: false);
}
}
}
return null;
}
public void Reset()
{
_semaphore = new SemaphoreSlim(0);
_ready.Clear();
_completed.Clear();
_deliverable.Clear();
_taskId = 0;
_delivered = 0;
}
}