/// <summary>
/// Returns the description of the provided actor type.
/// </summary>
/// <param name="type">
/// The actor type.
/// </param>
/// <returns>
/// The description of the provided actor type.
/// </returns>
private static ActorDescription GetActorDescription(Type type)
{
var actorAttr = type.GetCustomAttribute <ActorAttribute>() ?? new ActorAttribute(type);
var result = new ActorDescription
{
Kind = actorAttr.Kind,
IsSingleton = actorAttr.IsSingleton,
Methods = new Dictionary <string, ActorMethodDescription>(),
Type = type
};
// Get all server-visible methods from the type.
var methods = type.GetInterfaces().SelectMany(iface => iface.GetMethods()).Concat(type.GetMethods());
foreach (var method in methods)
{
var methodDescription = GetMethodDescription(method);
var ev = method.GetCustomAttribute <EventAttribute>();
var name = ev != null ? ev.Type : ProxyGenerationUtility.ToCanonicalName(method.Name);
result.Methods[name] = methodDescription;
}
return(result);
}
/// <summary>
/// Returns syntax for dispatching <paramref name="event"/> to <paramref name="actor"/>.
/// </summary>
/// <param name="actor">
/// The actor description.
/// </param>
/// <param name="event">
/// The event.
/// </param>
/// <returns>
/// Syntax for dispatching <paramref name="event"/> to <paramref name="actor"/>.
/// </returns>
private static SwitchSectionSyntax GetActorSwitch(
ActorDescription actor,
ExpressionSyntax @event)
{
var label =
SF.CaseSwitchLabel(SF.LiteralExpression(SyntaxKind.StringLiteralExpression, SF.Literal(actor.Kind)));
return
SF.SwitchSection()
.AddLabels(label)
.AddStatements(GenerateActorBlock(@event, actor));
}
/// <summary>
/// Returns syntax for dispatching <paramref name="event"/> to <paramref name="actor"/>.
/// </summary>
/// <param name="event">
/// The event.
/// </param>
/// <param name="actor">
/// The actor description.
/// </param>
/// <returns>
/// Syntax for dispatching <paramref name="event"/> to <paramref name="actor"/>.
/// </returns>
private static StatementSyntax GenerateActorBlock(
ExpressionSyntax @event,
ActorDescription actor)
{
var @var = SF.IdentifierName("var");
var grainType = actor.Type.GetTypeSyntax();
var getGrain =
SF.InvocationExpression(SF.IdentifierName("GrainFactory").Member("GetGrain", grainType))
.AddArgumentListArguments(SF.Argument(@event.Member("To").Member("Id")));
var grain = SF.VariableDeclarator("grain").WithInitializer(SF.EqualsValueClause(getGrain));
var grainDeclaration = SF.LocalDeclarationStatement(SF.VariableDeclaration(@var).AddVariables(grain));
var returnNull = SF.ReturnStatement(SF.LiteralExpression(SyntaxKind.NullLiteralExpression));
var defaultSection = SF.SwitchSection().AddLabels(SF.DefaultSwitchLabel()).AddStatements(returnNull);
var methodSwitch =
SF.SwitchStatement(@event.Member("Type"))
.AddSections(
actor.Methods.Values.Where(_ => _.Visible)
.Select(method => GetMethodSwitchCase(@event, method))
.ToArray())
.AddSections(defaultSection);
var methodDispatcher = SF.Block().AddStatements(grainDeclaration, methodSwitch);
return methodDispatcher;
}