FactSource GetNonGenericFactSource(
string factId, out FactPropertiesAttribute properties)
{
if (mActivatedFactSources.TryGetValue(factId, out FactSource factSource))
{
properties = mFactSourceProperties[factId];
return(factSource);
}
if (!mFactSources.TryGetValue(factId, out Type factSourceType))
{
throw new Exception(
$"There is no registered FactSource that provides '{factId}'");
}
FactSource instance = ActivateNonGenericSource(factSourceType);
properties = mFactSourceProperties[factId];
if (properties.ActivationPolicy == FactSourceActivationPolicy.JustOnce)
{
mActivatedFactSources.Add(factId, instance);
}
return(instance);
}
public FactSourceContainer Register <T>() where T : FactSource
{
Type type = typeof(T);
FactPropertiesAttribute attr = type.GetCustomAttributes(
typeof(FactPropertiesAttribute),
true).FirstOrDefault() as FactPropertiesAttribute;
if (attr == null)
{
throw new Exception(
$"Could not find a FactPropertiesAttribute for type {type}");
}
if (mFactSources.ContainsKey(attr.FactId))
{
throw new Exception($"Duplicate FactId ${attr.FactId}");
}
mFactSources.Add(attr.FactId, type);
mFactSourceProperties.Add(attr.FactId, attr);
if (attr.ActivationPolicy == FactSourceActivationPolicy.OnEngineStartup)
{
FactSource factSource = ActivateSource <FactSource>(type);
mActivatedFactSources.Add(attr.FactId, factSource);
}
return(this);
}
public async Task <Fact> RequestNonGenericFact(string factId)
{
FactSource source = GetNonGenericFactSource(
factId,
out FactPropertiesAttribute properties);
DateTime generatedOn = EngineClock.Default.Now();
Result result = await source.GetFact();
Type resultType = result.GetType();
Type resultDataType = resultType.GetGenericArguments()[0];
Type factType = typeof(Fact <>).MakeGenericType(resultDataType);
Fact fact = ActivateFact(factType);
fact.FactId = properties.FactId;
fact.Name = properties.Name;
fact.Description = properties.Description;
fact.GeneratedOn = generatedOn;
fact.ValidUntil = Add(generatedOn, result.TimeToLive);
PropertyInfo resultDataProperty = resultType.GetProperty("Data");
PropertyInfo factDataProperty = factType.GetProperty("Data");
factDataProperty.SetValue(
fact,
resultDataProperty.GetValue(result));
return(fact);
}
FactSource ActivateNonGenericSource(Type t)
{
FactSource result = Activator.CreateInstance(t) as FactSource;
if (result != null)
{
return(result);
}
throw new Exception(
$"Could not activate {t} as FactSource.");
}