public DbLogger(ConnectionString connString, ILogger log)
{
Connect = f => ConnectionHelper.Connect(connString, f);
Time = op => f => Instrumentation.Time(log, op, f.ToNullary());
Trace = op => f => Instrumentation.Trace(log, op, f.ToNullary());
}
public static Middleware <RR> SelectMany <T, R, RR>
(this Middleware <T> @this, Func <T, Middleware <R> > f, Func <T, R, RR> project)
=> cont => @this(t => f(t)(r => cont(project(t, r))));
public static T Run <T>(this Middleware <T> mw) => mw(t => t);
public static Middleware <R> SelectMany <T, R>
(this Middleware <T> mw, Func <T, Middleware <R> > f)
=> cont => mw(t => f(t)(cont));
public static Middleware <R> Select <T, R>
(this Middleware <T> mw, Func <T, R> f)
=> cont => mw(t => cont(f(t)));
public static Middleware <R> Bind <T, R>
(this Middleware <T> mw, Func <T, Middleware <R> > f)
=> SelectMany(mw, f);
public static Middleware <R> Map <T, R>
(this Middleware <T> mw, Func <T, R> f)
=> Select(mw, f);
// cand definesc o variabila un delegate Middleware<T> = definesc o metoda care primeste ca parametru un Func<T, dynamic> delegate si corpul executiei ei
// cand invoc un delegate Middleware<T> = definesc functia care primeste un T si intoarce un dynamic, altfel spus specific parametrii/argumetele lui Middleware<T>,
// altfel spus instantiez delegat-ul Func<T, dynamic>
//public static Middleware<R> SelectMany<T, R>
// (this Middleware<T> mw, Func<T, Middleware<R>> f)
// => cont => mw(t => f(t)(cont));
public static Middleware <R> SelectMany <T, R>
(this Middleware <T> mw, Func <T, Middleware <R> > f)
{
return(new Middleware <R>(cont => { return (dynamic)mw.Invoke(new Func <T, dynamic>(t => f.Invoke(t).Invoke(cont))); }));
}