/// <summary>
/// Creates a local activity stub instance suitable for executing a non-local activity.
/// </summary>
/// <param name="client">The associated <see cref="TemporalClient"/>.</param>
/// <param name="workflow">The parent workflow.</param>
/// <param name="activityType">The activity implementation type.</param>
/// <param name="options">Specifies the <see cref="LocalActivityOptions"/> or <c>null</c>.</param>
/// <returns>The activity stub as an <see cref="object"/>.</returns>
public object CreateLocal(TemporalClient client, Workflow workflow, Type activityType, LocalActivityOptions options)
{
Covenant.Requires <ArgumentNullException>(client != null, nameof(client));
Covenant.Requires <ArgumentNullException>(workflow != null, nameof(workflow));
Covenant.Requires <ArgumentNullException>(activityType != null, nameof(activityType));
options = options ?? new LocalActivityOptions();
return(localConstructor.Invoke(new object[] { client, client.DataConverter, workflow, activityType, options, TemporalHelper.GetActivityInterface(activityType) }));
}
/// <summary>
/// Registers an activity implementation with the temporal-proxy.
/// </summary>
/// <param name="activityType">The activity implementation type.</param>
/// <exception cref="RegistrationException">Thrown when there's a problem with the registration.</exception>
private async Task RegisterActivityImplementationAsync(Type activityType)
{
await SyncContext.Clear;
TemporalHelper.ValidateActivityImplementation(activityType);
var interfaceType = TemporalHelper.GetActivityInterface(activityType);
TemporalHelper.ValidateActivityInterface(interfaceType);
// We need to register each activity method that implements an activity interface method
// with the same signature that that was tagged by [ActivityMethod].
//
// First, we'll create a dictionary that maps method signatures from any inherited
// interfaces that are tagged by [ActivityMethod] to the attribute.
var methodSignatureToAttribute = new Dictionary <string, ActivityMethodAttribute>();
foreach (var method in interfaceType.GetMethods(BindingFlags.Public | BindingFlags.Instance))
{
var activityMethodAttribute = method.GetCustomAttribute <ActivityMethodAttribute>();
if (activityMethodAttribute == null)
{
continue;
}
var signature = method.ToString();
if (methodSignatureToAttribute.ContainsKey(signature))
{
throw new NotSupportedException($"Activity type [{activityType.FullName}] cannot implement the [{signature}] method from two different interfaces.");
}
methodSignatureToAttribute.Add(signature, activityMethodAttribute);
}
// Next, we need to register the activity methods that implement the
// activity interface.
foreach (var method in activityType.GetMethods())
{
if (!methodSignatureToAttribute.TryGetValue(method.ToString(), out var activityMethodAttribute))
{
continue;
}
var activityTarget = TemporalHelper.GetActivityTarget(interfaceType, activityMethodAttribute.Name);
lock (nameToActivityRegistration)
{
if (nameToActivityRegistration.TryGetValue(activityTarget.ActivityTypeName, out var registration))
{
if (!object.ReferenceEquals(registration.ActivityType, registration.ActivityType))
{
throw new InvalidOperationException($"Conflicting activity type registration: Activity type [{activityType.FullName}] is already registered for activity type name [{activityTarget.ActivityTypeName}].");
}
}
else
{
nameToActivityRegistration[activityTarget.ActivityTypeName] =
new ActivityRegistration()
{
ActivityType = activityType,
ActivityMethod = method,
ActivityMethodParameterTypes = method.GetParameterTypes()
};
}
}
var reply = (ActivityRegisterReply)await Client.CallProxyAsync(
new ActivityRegisterRequest()
{
WorkerId = WorkerId,
Name = activityTarget.ActivityTypeName,
});
reply.ThrowOnError();
}
}