internal static EventRegistration SetEventName(this EventRegistration reg, EventBusNamingOptions options)
{
if (reg is null)
{
throw new ArgumentNullException(nameof(reg));
}
if (options is null)
{
throw new ArgumentNullException(nameof(options));
}
// set the event name, if not set
if (string.IsNullOrWhiteSpace(reg.EventName))
{
var type = reg.EventType;
// prioritize the attribute if available, otherwise get the type name
var ename = type.GetCustomAttributes(false).OfType <EventNameAttribute>().SingleOrDefault()?.EventName;
if (ename == null)
{
var typeName = options.UseFullTypeNames ? type.FullName : type.Name;
typeName = options.TrimCommonSuffixes(typeName);
ename = typeName;
ename = options.ApplyNamingConvention(ename);
ename = options.AppendScope(ename);
ename = options.ReplaceInvalidCharacters(ename);
}
reg.EventName = ename;
}
return(reg);
}
internal static EventRegistration SetConsumerNames(this EventRegistration reg,
EventBusNamingOptions options,
IHostEnvironment environment)
{
if (reg is null)
{
throw new ArgumentNullException(nameof(reg));
}
if (options is null)
{
throw new ArgumentNullException(nameof(options));
}
if (environment is null)
{
throw new ArgumentNullException(nameof(environment));
}
// ensure we have the event name set
if (string.IsNullOrWhiteSpace(reg.EventName))
{
throw new InvalidOperationException($"The {nameof(reg.EventName)} for must be set before setting names of the consumer.");
}
// prefix is either the one provided or the application name
var prefix = options.ConsumerNamePrefix ?? environment.ApplicationName;
foreach (var creg in reg.Consumers)
{
// set the consumer name, if not set
if (string.IsNullOrWhiteSpace(creg.ConsumerName))
{
var type = creg.ConsumerType;
// prioritize the attribute if available, otherwise get the type name
var cname = type.GetCustomAttributes(false).OfType <ConsumerNameAttribute>().SingleOrDefault()?.ConsumerName;
if (cname == null)
{
var typeName = options.UseFullTypeNames ? type.FullName : type.Name;
typeName = options.TrimCommonSuffixes(typeName);
cname = options.ConsumerNameSource switch
{
ConsumerNameSource.TypeName => typeName,
ConsumerNameSource.Prefix => prefix,
ConsumerNameSource.PrefixAndTypeName => $"{prefix}.{typeName}",
_ => throw new InvalidOperationException($"'{nameof(options.ConsumerNameSource)}.{options.ConsumerNameSource}' is not supported"),
};
cname = options.ApplyNamingConvention(cname);
cname = options.AppendScope(cname);
cname = options.ReplaceInvalidCharacters(cname);
}
// Appending the EventName to the consumer name can ensure it is unique
creg.ConsumerName = options.SuffixConsumerName ? options.Join(cname, reg.EventName) : cname;
}
}
return(reg);
}