internal static QueryDelegate CreateDelegate <TMiddleware>(
Func <IServiceProvider, QueryDelegate, TMiddleware> factory,
QueryDelegate next)
where TMiddleware : class
{
object sync = new object();
TMiddleware middleware = null;
var compiled = MiddlewareActivator
.CompileMiddleware <TMiddleware, IQueryContext>();
return(context =>
{
if (middleware == null)
{
lock (sync)
{
if (middleware == null)
{
middleware = factory(context.Services, next);
}
}
}
return compiled(context, context.Services, middleware);
});
}
private static FieldDelegate CreateDelegate <TMiddleware>(
Func <IServiceProvider, FieldDelegate, TMiddleware> factory,
FieldDelegate next)
where TMiddleware : class
{
object sync = new object();
TMiddleware middleware = null;
ClassQueryDelegate <TMiddleware, IMiddlewareContext> compiled =
MiddlewareActivator
.CompileMiddleware <TMiddleware, IMiddlewareContext>();
return(context =>
{
if (middleware == null)
{
lock (sync)
{
if (middleware == null)
{
middleware = factory(
context.Service <IServiceProvider>(),
next);
}
}
}
return compiled(
context,
context.Service <IServiceProvider>(),
middleware);
});
}
internal static QueryMiddleware Create <TMiddleware>()
where TMiddleware : class
{
return(next =>
{
MiddlewareFactory <TMiddleware, QueryDelegate> factory =
MiddlewareActivator.CompileFactory <TMiddleware, QueryDelegate>();
return CreateDelegate((s, n) => factory(s, n), next);
});
}
internal static FieldMiddleware Create <TMiddleware>()
where TMiddleware : class
{
return(next =>
{
var factory = MiddlewareActivator
.CompileFactory <TMiddleware, FieldDelegate>();
return CreateDelegate <TMiddleware>(
(s, n) => factory(s, n),
next);
});
}
public static FieldMiddleware Create <TMiddleware>(
params object[] customParameters
)
where TMiddleware : class
{
return(next =>
{
MiddlewareFactory <TMiddleware, FieldDelegate> factory =
MiddlewareActivator
.CompileFactory <TMiddleware, FieldDelegate>(customParameters);
return CreateDelegate(
(s, n) => factory(s, n),
next);
});
}
