// ------------------------
// Send an email
// ------------------------
public static SimpleRequest SendEmail(SimpleRequest input)
{
if (input.Email.EndsWith("example.com"))
throw new Exception(string.Format("Can't send email to {0}", input.Email));
else
Console.WriteLine("Sending email={0}", input.Email);
return input; // return request for processing by next step }
}
// ------------------------
// Update the database
// ------------------------
public static void UpdateDatabase(SimpleRequest input)
{
// do something
// return nothing at all
Console.WriteLine("Database updated with userId={0} email={1}", input.UserId, input.Email);
}
// ------------------------
// Add another step
// ------------------------
// trim spaces and lowercase
public static SimpleRequest CanonicalizeEmail(SimpleRequest input)
{
return(new SimpleRequest {
UserId = input.UserId, Name = input.Name, Email = input.Email.Trim().ToLower()
});
}
// ------------------------
// Update the database
// ------------------------
public static void UpdateDatabase(SimpleRequest input)
{
// do something
// return nothing at all
Console.WriteLine("Database updated with userId={0} email={1}", input.UserId, input.Email);
}
// ------------------------
// Add another step
// ------------------------
// trim spaces and lowercase
public static SimpleRequest CanonicalizeEmail(SimpleRequest input)
{
return new SimpleRequest { UserId = input.UserId, Name = input.Name, Email = input.Email.Trim().ToLower() };
}
private static RopResult<SimpleRequest, string> ValidateRequest(SimpleRequest input)
{
var name50R = Rop.Bind<SimpleRequest, SimpleRequest, string>(Name50);
var emailNotBlankR = Rop.Bind<SimpleRequest, SimpleRequest, string>(EmailNotBlank);
return input
.Pipe(NameNotBlank) // the first one does not need to be bound
.Pipe(name50R)
.Pipe(emailNotBlankR);
}
private static RopResult<SimpleRequest, string> NameNotBlank(SimpleRequest input)
{
if (input.Name == "")
return Rop.Fail<SimpleRequest, string>("Name must not be blank");
else
return Rop.Succeed<SimpleRequest, string>(input);
}
private static RopResult<SimpleRequest, string> Name50(SimpleRequest input)
{
if (input.Name.Length > 50)
return Rop.Fail<SimpleRequest, string>("Name must not be longer than 50 chars");
else
return Rop.Succeed<SimpleRequest, string>(input);
}