/// <summary>
/// Pipes values from `from` into `to`
/// </summary>
/// <typeparam name="TIn"></typeparam>
/// <typeparam name="TMid"></typeparam>
/// <typeparam name="TOut"></typeparam>
/// <param name="from">source channel</param>
/// <param name="to">destination channel</param>
/// <param name="closeOnFinished">Tf true, will close the other channel when one channel closes</param>
/// <returns></returns>
public static async Task Pipe <T>(this IReadPort <T> from, IWritePort <T> to, bool closeOnFinished = true)
{
while (true)
{
var(isFromOpen, val) = await from.Take();
if (isFromOpen)
{
var isToOpen = await to.Put(val);
if (isToOpen)
{
continue;
}
if (closeOnFinished)
{
@from.Close();
}
break;
}
if (closeOnFinished)
{
to.Close();
}
break;
}
}
public static async Task UnorderedPipeline <TIn, TOut>(
this IReadPort <TIn> from,
IWritePort <TOut> to,
Func <TIn, Task <TOut> > f,
bool propagateClose = true)
{
await UnorderedPipeline(from, Environment.ProcessorCount, to, f, propagateClose);
}
public static async Task OntoChannel <T>(this IEnumerable <T> coll, IWritePort <T> chan)
{
foreach (var val in coll)
{
if (!await chan.Put(val))
{
break;
}
}
}
public static async Task UnorderedThreadedPipeline <TIn, TOut>(
this IReadPort <TIn> from,
int parallelism,
IWritePort <TOut> to,
Func <TIn, TOut> f,
bool propagateClose = true)
{
Task Pump()
{
var tcs = new TaskCompletionSource <bool>();
var th = new Thread(() =>
{
while (true)
{
var(is_open, job) = from.Take().Result;
if (!is_open)
{
break;
}
var putIsOpen = to.Put(f(job)).Result;
if (!putIsOpen)
{
return;
}
}
tcs.SetResult(true);
})
{
Priority = ThreadPriority.BelowNormal
};
th.Start();
return(tcs.Task);
}
await Task.WhenAll(Enumerable.Range(0, parallelism)
.Select(idx => Task.Run(Pump)));
if (propagateClose)
{
from.Close();
to.Close();
}
}
public static async Task UnorderedPipeline <TIn, TOut>(
this IReadPort <TIn> from,
int parallelism,
IWritePort <TOut> to,
Func <TIn, Task <TOut> > f,
bool propagateClose = true)
{
async Task Pump()
{
while (true)
{
var(is_open, job) = await from.Take();
if (!is_open)
{
break;
}
var putIsOpen = await to.Put(await f(job));
if (!putIsOpen)
{
return;
}
}
}
await Task.WhenAll(Enumerable.Range(0, parallelism)
.Select(idx => Task.Run(Pump)));
if (propagateClose)
{
from.Close();
to.Close();
}
}
/// <summary>
/// Creates a pipeline that takes items from `from` transforms them with the pipeline given by `transform` and puts
/// the resulting values onto `to`. The pipeline may create 0 or more items for every input item and they will be
/// spooled onto `to` in a undefined order. `n` determines how many parallel tasks will be running at once. Each of
/// these tasks maintains its own transformation pipeline, so `transform` will be called once for every `n`. Completing
/// a `transform` pipeline has no effect.
/// </summary>
/// <typeparam name="TInSrc"></typeparam>
/// <typeparam name="TOutSrc"></typeparam>
/// <typeparam name="TInDest"></typeparam>
/// <typeparam name="TOutDest"></typeparam>
/// <param name="from"></param>
/// <param name="parallelism"></param>
/// <param name="to"></param>
/// <param name="transform"></param>
/// <param name="propagateClose"></param>
/// <returns></returns>
public static async Task UnorderedPipeline <TIn, TOut>(
this IReadPort <TIn> from,
int parallelism,
IWritePort <TOut> to,
Func <IObservable <TIn>, IObservable <TOut> > transform,
bool propagateClose = true)
{
async Task Pump()
{
var pipeline = new Subject <TIn>();
var buffer = new List <TOut>();
var dest = transform(pipeline);
dest.Subscribe(itm => buffer.Add(itm));
while (true)
{
var(is_open, tval) = await from.Take();
if (is_open)
{
pipeline.OnNext(tval);
foreach (var pval in buffer)
{
var is_put_open = await to.Put(pval);
if (is_put_open)
{
continue;
}
if (propagateClose)
{
@from.Close();
}
return;
}
buffer.Clear();
}
else
{
pipeline.OnCompleted();
if (buffer.Count > 0)
{
foreach (var pval in buffer)
{
if (!await to.Put(pval))
{
break;
}
}
}
break;
}
}
}
await Task.WhenAll(Enumerable.Range(0, parallelism)
.Select(idx => Task.Run(Pump)));
if (propagateClose)
{
from.Close();
to.Close();
}
}
