/// <summary>
/// Handle a given method name and json encoded message.
/// An appropriate method on the IServiceHandler is looked for which
/// matches with the specified method name.
/// From this the type of the message parameter is determined.
/// The message is decoded from JSON, the method invoked and
/// the value seen returned back.
/// </summary>
/// <returns>MessageResult instance</returns>
/// <param name="method">Method.</param>
/// <param name="messageJson">Message json.</param>
///
public Task <MessagingResult> Execute(string method, string messageJson)
{
// need to look for a method which is of the appropriate signature
// i.e. 'called' method
// from that we get the type of the message
var methodInfo = _serviceHandler.GetType().GetMethods().FirstOrDefault(m => string.Compare(m.Name, method, StringComparison.OrdinalIgnoreCase) == 0);
// ensure we have a match against the method name
if (methodInfo == null)
{
throw new MissingMemberException($"{method}");
}
// check that we have a details parameter
var parameters = methodInfo.GetParameters();
if (parameters.Length != 1)
{
throw new MissingMethodException($"{method} - incorrect parameter count, should be 1, received {parameters.Length}");
}
var parameter = parameters[0];
var parameterType = parameter.ParameterType;
var messageObject = JsonConvert.DeserializeObject(messageJson, parameterType);
var resultTask = methodInfo.Invoke(_serviceHandler, new object[] { messageObject });
var task = (Task <MessagingResult>)resultTask;
return(task.ContinueWith(t => t.Result));
}