public void Intercept(DispatcherInvocationContext context)
{
if (context.Message == null)
return;
var command = context.Message as ICommand;
if (command != null)
{
try
{
LogManager.LogCommand(command);
context.Invoke();
LogManager.LogCommandHandler(command.Metadata.CommandId, context.Handler.GetType().FullName);
}
catch(Exception ex)
{
LogManager.LogCommandHandler(command.Metadata.CommandId, context.Handler.GetType().FullName, ex);
throw;
}
return;
}
var evnt = context.Message as IEvent;
if (evnt != null)
{
try
{
LogManager.LogEvent(evnt);
context.Invoke();
LogManager.LogEventHandler(evnt.Metadata.CommandId, evnt.Metadata.EventId, context.Handler.GetType().FullName);
}
catch (Exception ex)
{
LogManager.LogEventHandler(evnt.Metadata.CommandId, evnt.Metadata.EventId, context.Handler.GetType().FullName, ex);
throw;
}
return;
}
// if this is not command or event - execute as usual
context.Invoke();
}
private void ExecuteHandler(Object handler, Object message, Action<Exception> exceptionObserver = null)
{
var attempt = 0;
while (attempt < _maxRetries)
{
try
{
var context = new DispatcherInvocationContext(this, handler, message);
if (_registry.Interceptors.Count > 0)
{
// Call interceptors in backward order
for (int i = _registry.Interceptors.Count - 1; i >= 0; i--)
{
var interceptorType = _registry.Interceptors[i];
var interceptor = (IMessageHandlerInterceptor)_serviceLocator.GetInstance(interceptorType);
context = new DispatcherInterceptorContext(interceptor, context);
}
}
context.Invoke();
// message handled correctly - so that should be
// the final attempt
attempt = _maxRetries;
}
catch (Exception exception)
{
if (exceptionObserver != null)
exceptionObserver(exception);
attempt++;
if (attempt == _maxRetries)
{
throw new HandlerException(String.Format(
"Exception in the handler {0} for message {1}", handler.GetType().FullName, message.GetType().FullName), exception, message);
}
}
}
}
/// <summary>
/// Initializes a new instance of the <see cref="T:System.Object"/> class.
/// </summary>
public DispatcherInterceptorContext(IMessageHandlerInterceptor interceptor, DispatcherInvocationContext context)
{
_interceptor = interceptor;
_context = context;
}
