/// <summary>
/// Register an event handler that will listen and respond to all events.
/// </summary>
public void RegisterGlobalEventHandler <TMessage>(Action <TMessage> handler, bool holdMessageLock = true) where TMessage : IMessage
{
Action <TMessage> registerableHandler = BusHelper.BuildTelemeteredActionHandler <TMessage, TAuthenticationToken>(TelemetryHelper, handler, holdMessageLock, "In-Process/Bus");
Routes.RegisterGlobalEventHandler(registerableHandler, holdMessageLock);
TelemetryHelper.TrackEvent(string.Format("Cqrs/RegisterGlobalEventHandler/{0}", typeof(TMessage).FullName), new Dictionary <string, string> {
{ "Type", "In-Process/Bus" }
});
TelemetryHelper.Flush();
}
public virtual bool?ReceiveCommand(ICommand <TAuthenticationToken> command)
{
CorrelationIdHelper.SetCorrelationId(command.CorrelationId);
AuthenticationTokenHelper.SetAuthenticationToken(command.AuthenticationToken);
Type commandType = command.GetType();
bool response = true;
bool isRequired = BusHelper.IsEventRequired(commandType);
IList <Action <IMessage> > handlers;
if (Routes.TryGetValue(commandType, out handlers))
{
if (handlers != null)
{
if (handlers.Count != 1)
{
throw new MultipleCommandHandlersRegisteredException(commandType);
}
if (handlers.Count == 1)
{
handlers.Single()(command);
}
else if (isRequired)
{
throw new NoCommandHandlerRegisteredException(commandType);
}
else
{
response = false;
}
}
else if (isRequired)
{
throw new NoCommandHandlerRegisteredException(commandType);
}
else
{
response = false;
}
}
else if (isRequired)
{
throw new NoCommandHandlerRegisteredException(commandType);
}
else
{
response = false;
}
return(response);
}
protected virtual bool PrepareAndValidateCommand <TCommand>(TCommand command, out RouteHandlerDelegate commandHandler)
where TCommand : ICommand <TAuthenticationToken>
{
Type commandType = command.GetType();
switch (command.Framework)
{
case FrameworkType.Akka:
Logger.LogInfo(string.Format("A command arrived of the type '{0}' but was marked as coming from the '{1}' framework, so it was dropped.", commandType.FullName, command.Framework));
commandHandler = null;
return(false);
}
ICommandValidator <TAuthenticationToken, TCommand> commandValidator = null;
try
{
commandValidator = DependencyResolver.Resolve <ICommandValidator <TAuthenticationToken, TCommand> >();
}
catch (Exception exception)
{
Logger.LogDebug("Locating an ICommandValidator failed.", string.Format("{0}\\Handle({1})", GetType().FullName, commandType.FullName), exception);
}
if (commandValidator != null && !commandValidator.IsCommandValid(command))
{
Logger.LogInfo("The provided command is not valid.", string.Format("{0}\\Handle({1})", GetType().FullName, commandType.FullName));
commandHandler = null;
return(false);
}
PrepareCommand(command);
bool isRequired = BusHelper.IsEventRequired(commandType);
commandHandler = Routes.GetSingleHandler(command, isRequired);
// This check doesn't require an isRequired check as there will be an exception raised above and handled below.
if (commandHandler == null)
{
Logger.LogDebug(string.Format("The command handler for '{0}' is not required.", commandType.FullName));
return(false);
}
return(true);
}
protected virtual bool PrepareAndValidateCommand <TCommand>(TCommand command, out RouteHandlerDelegate commandHandler)
where TCommand : ICommand <TAuthenticationToken>
{
Type commandType = command.GetType();
if (command.Frameworks != null && command.Frameworks.Contains("Built-In"))
{
Logger.LogInfo("The provided command has already been processed by the Built-In bus.", string.Format("{0}\\PrepareAndValidateEvent({1})", GetType().FullName, commandType.FullName));
commandHandler = null;
return(false);
}
ICommandValidator <TAuthenticationToken, TCommand> commandValidator = null;
try
{
commandValidator = DependencyResolver.Resolve <ICommandValidator <TAuthenticationToken, TCommand> >();
}
catch (Exception exception)
{
Logger.LogDebug("Locating an ICommandValidator failed.", string.Format("{0}\\Handle({1})", GetType().FullName, commandType.FullName), exception);
}
if (commandValidator != null && !commandValidator.IsCommandValid(command))
{
Logger.LogInfo("The provided command is not valid.", string.Format("{0}\\Handle({1})", GetType().FullName, commandType.FullName));
commandHandler = null;
return(false);
}
PrepareCommand(command);
bool isRequired = BusHelper.IsEventRequired(commandType);
commandHandler = Routes.GetSingleHandler(command, isRequired);
// This check doesn't require an isRequired check as there will be an exception raised above and handled below.
if (commandHandler == null)
{
Logger.LogDebug(string.Format("The command handler for '{0}' is not required.", commandType.FullName));
return(false);
}
return(true);
}
