/// <summary>
/// Handles messages of a given query type.
/// </summary>
/// <typeparam name="TQuery">A query type.</typeparam>
/// <param name="handler">An handler.</param>
/// <param name="channel">A channel.</param>
/// <param name="topic">A topic.</param>
/// <returns>A subscription.</returns>
public static IDisposable HandleQuery <TQuery>(this IBox box, IHandler <TQuery> handler, string channel = null, string topic = null) where TQuery : IQuery
{
if (topic == null)
{
throw new ArgumentNullException(nameof(topic));
}
if (handler == null)
{
throw new ArgumentNullException(nameof(handler));
}
return(box.AddHandler(handler, channel, topic));
}