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// File "DelegateExtensions.cs" last formatted on 2022-04-07 at 12:38 PM by Protiguous.
public static class DelegateExtensions {
private sealed class ContextCallOnlyXTimes {
internal Int64 CallsAllowed;
public ContextCallOnlyXTimes( Int64 times ) {
if ( times <= 0 ) {
times = 0;
}
this.CallsAllowed = times;
}
}
/// <summary>Only allow a delegate to run X times.</summary>
/// <param name="action"></param>
/// <param name="callsAllowed"></param>
/// <example>var barWithBarrier = ActionBarrier(Bar, remainingCallsAllowed: 2 );</example>
/// <remarks>Calling the delegate more often than <paramref name="callsAllowed" /> should just NOP.</remarks>
public static Action ActionBarrier( this Action action, Int64 callsAllowed = 1 ) {
var context = new ContextCallOnlyXTimes( callsAllowed );
return () => {
if ( Interlocked.Decrement( ref context.CallsAllowed ) >= 1 ) {
action();
}
};
}
/// <summary>Only allow a delegate to run X times.</summary>
/// <param name="action"></param>
/// <param name="parameter"></param>
/// <param name="callsAllowed"></param>
/// <example>var barWithBarrier = ActionBarrier(Bar, remainingCallsAllowed: 2 );</example>
/// <remarks>Calling the delegate more often than <paramref name="callsAllowed" /> should just NOP.</remarks>
public static Action ActionBarrier<T>( this Action<T?> action, T? parameter, Int64 callsAllowed = 1 ) {
var context = new ContextCallOnlyXTimes( callsAllowed );
return () => {
if ( Interlocked.Decrement( ref context.CallsAllowed ) >= 1 ) {
action( parameter );
}
};
}
}
Protiguous 