public Task Subscribe(ExpressionNode expression, IRegistryListener <K, T> listener, String @ref = "")
{
var key = Tuple.Create(listener, @ref);
SubscriptionFilterCache.Remove(key);
State.Subscriptions[key] = expression;
return(base.WriteStateAsync());
}
public Task Unsubscribe(IRegistryListener <K, T> listener, String @ref = "")
{
var key = Tuple.Create(listener, @ref);
State.Subscriptions.Remove(key);
SubscriptionFilterCache.Remove(key);
return(base.WriteStateAsync());
}
/// <summary>
/// Listen for new registrations to the registry. If a subscription already exists, it will just be updated with the new expression. This is a wrapper which can simplify work with <see cref="Scynet.GrainInterfaces.IRegistry.Subscribe"/>
/// </summary>
/// <typeparam name="K">Registry key type</typeparam>
/// <typeparam name="T">Registry value type</typeparam>
/// <param name="query">A lambda which decides what items are interesting for the listener</param>
/// <param name="listener">The listener which would receive the notifications</param>
/// <param name="ref">A reference with which the subscription is tracked</param>
public static Task Subscribe <K, T>(this IRegistry <K, T> registry, Expression <Func <K, T, bool> > query, IRegistryListener <K, T> listener, String @ref = "")
{
var expressionNode = query.ToExpressionNode();
return(registry.Subscribe(expressionNode, listener, @ref));
}
