StopAndGoSpoolingTask.cs

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using System.Threading;
 
namespace System.Linq.Parallel;
 
internal sealed class StopAndGoSpoolingTask<TInputOutput, TIgnoreKey> : SpoolingTaskBase
{
    private readonly QueryOperatorEnumerator<TInputOutput, TIgnoreKey> _source;
 
    private readonly SynchronousChannel<TInputOutput> _destination;
 
    internal StopAndGoSpoolingTask(int taskIndex, QueryTaskGroupState groupState, QueryOperatorEnumerator<TInputOutput, TIgnoreKey> source, SynchronousChannel<TInputOutput> destination)
        : base(taskIndex, groupState)
    {
        _source = source;
        _destination = destination;
    }
 
    protected override void SpoolingWork()
    {
        TInputOutput currentElement = default(TInputOutput);
        TIgnoreKey currentKey = default(TIgnoreKey);
        QueryOperatorEnumerator<TInputOutput, TIgnoreKey> source = _source;
        SynchronousChannel<TInputOutput> destination = _destination;
        CancellationToken mergedCancellationToken = _groupState.CancellationState.MergedCancellationToken;
        destination.Init();
        while (source.MoveNext(ref currentElement, ref currentKey) && !mergedCancellationToken.IsCancellationRequested)
        {
            destination.Enqueue(currentElement);
        }
    }
 
    protected override void SpoolingFinally()
    {
        base.SpoolingFinally();
        if (_destination != null)
        {
            _destination.SetDone();
        }
        _source.Dispose();
    }
}