public DelegateInstallationMiddleware(
AppliesTo <InstallationContext> appliesTo,
InvokeAsync <InstallationContext> invokeAsync)
{
_appliesTo = appliesTo ?? throw new ArgumentNullException(nameof(appliesTo));
_invokeAsync = invokeAsync ?? throw new ArgumentNullException(nameof(invokeAsync));
}
/// <summary>
/// Parallel ForEach method.
/// </summary>
/// <remarks>Source: http://www.codeproject.com/KB/dotnet/PoorMansParallelForEach.aspx</remarks>
public static void ForEach <T>(IEnumerable <T> enumerable, Action <T> action)
{
int threadCount = Environment.ProcessorCount;
object syncRoot = new object();
if (enumerable == null)
{
return;
}
IEnumerator <T> enumerator = enumerable.GetEnumerator();
InvokeAsync <T> del = InvokeAction;
T[] seedItemArray = new T[threadCount];
List <IAsyncResult> resultList = new List <IAsyncResult>(threadCount);
for (int i = 0; i < threadCount; i++)
{
bool moveNext;
lock (syncRoot)
{
moveNext = enumerator.MoveNext();
seedItemArray[i] = enumerator.Current;
}
if (moveNext)
{
IAsyncResult iAsyncResult = del.BeginInvoke
(enumerator, action, seedItemArray[i], syncRoot, i, null, null);
resultList.Add(iAsyncResult);
}
}
foreach (IAsyncResult iAsyncResult in resultList)
{
del.EndInvoke(iAsyncResult);
iAsyncResult.AsyncWaitHandle.Close();
}
}
public static void ForEach <T>(IEnumerable <T> enumerable, System.Action <T> action)
{
var syncRoot = new object();
if (enumerable == null)
{
return;
}
var enumerator = enumerable.GetEnumerator();
InvokeAsync <T> del = InvokeAction;
var seedItemArray = new T[NumberOfParallelTasks];
var resultList = new List <System.IAsyncResult>(NumberOfParallelTasks);
for (int i = 0; i < NumberOfParallelTasks; i++)
{
bool moveNext;
lock (syncRoot)
{
moveNext = enumerator.MoveNext();
seedItemArray[i] = enumerator.Current;
}
if (moveNext)
{
var iAsyncResult = del.BeginInvoke
(enumerator, action, seedItemArray[i], syncRoot, i, null, null);
resultList.Add(iAsyncResult);
}
}
for (int i = 0, resultListCount = resultList.Count; i < resultListCount; i++)
{
var iAsyncResult = resultList[i];
del.EndInvoke(iAsyncResult);
iAsyncResult.AsyncWaitHandle.Close();
}
}
// Alias to match the name of delegate.Invoke
public static ValueTask Invoke <T>(
this InvokeAsync <T> invocation,
T context,
CancellationToken cancellationToken = default)
=> invocation.InvokeAsync(context, cancellationToken);
