protected virtual void Handle(ICommandHandler handler, ICommand command)
{
int i = 0;
bool done = false;
while (!done && i < 100)
{
try
{
_messagesTracker.ElaborationStarted(command.MessageId, DateTime.UtcNow);
handler.Handle(command);
_messagesTracker.Completed(command.MessageId, DateTime.UtcNow);
done = true;
}
catch (ConflictingCommandException ex)
{
MetricsHelper.MarkConcurrencyException();
// retry
if (Logger.IsInfoEnabled)
{
Logger.InfoFormat(ex, "Handled {0} {1}, concurrency exception. Retrying", command.GetType().FullName, command.MessageId);
}
if (i++ > 5)
{
Thread.Sleep(new Random(DateTime.Now.Millisecond).Next(i * 10));
}
}
catch (DomainException ex)
{
_logger.ErrorFormat(ex, "DomainException on command {0} [MessageId: {1}] : {2} : {3}", command.GetType(), command.MessageId, command.Describe(), ex.Message);
MetricsHelper.MarkDomainException();
_messagesTracker.Failed(command.MessageId, DateTime.UtcNow, ex);
throw; //rethrow domain exception.
}
catch (Exception ex)
{
_logger.ErrorFormat(ex, "Generic Exception on command {0} [MessageId: {1}] : {2} : {3}", command.GetType(), command.MessageId, command.Describe(), ex.Message);
_messagesTracker.Failed(command.MessageId, DateTime.UtcNow, ex);
throw; //rethrow exception.
}
}
if (done == false)
{
_logger.ErrorFormat("Too many conflict on command {0} [MessageId: {1}] : {2}", command.GetType(), command.MessageId, command.Describe());
var exception = new Exception("Command failed. Too many Conflicts");
_messagesTracker.Failed(command.MessageId, DateTime.UtcNow, exception);
throw exception;
}
if (Logger.IsDebugEnabled)
{
Logger.DebugFormat("Command {0} executed: {1}", command.MessageId, command.Describe());
}
}
public void Handle(T message)
{
try
{
Logger.MarkCommandExecution(message);
if (Logger.IsDebugEnabled)
{
Logger.DebugFormat("Handling {0} {1}", message.GetType().FullName, message.MessageId);
}
int i = 0;
bool done = false;
var notifyTo = message.GetContextData(MessagesConstants.ReplyToHeader);
while (!done && i < 100)
{
try
{
_messagesTracker.ElaborationStarted(message.MessageId, DateTime.UtcNow);
_commandHandler.Handle(message);
_messagesTracker.Completed(message.MessageId, DateTime.UtcNow);
done = true;
if (notifyTo != null && message.GetContextData("disable-success-reply", "false") != "true")
{
var replyCommand = new CommandHandled(
notifyTo,
message.MessageId,
CommandHandled.CommandResult.Handled,
message.Describe()
);
replyCommand.CopyHeaders(message);
_bus.Reply(replyCommand);
}
}
catch (ConflictingCommandException ex)
{
MetricsHelper.MarkConcurrencyException();
// retry
if (Logger.IsInfoEnabled)
{
Logger.InfoFormat(ex, "Handled {0} {1} [{2}], concurrency exception. Retry count: {3}", message.GetType().FullName, message.MessageId, message.Describe(), i);
}
if (i++ > 5)
{
Thread.Sleep(new Random(DateTime.Now.Millisecond).Next(i * 10));
}
}
catch (DomainException ex)
{
MetricsHelper.MarkDomainException();
done = true;
_messagesTracker.Failed(message.MessageId, DateTime.UtcNow, ex);
if (notifyTo != null)
{
var replyCommand = new CommandHandled(
notifyTo,
message.MessageId,
CommandHandled.CommandResult.Failed,
message.Describe(),
ex.Message,
true
);
replyCommand.CopyHeaders(message);
_bus.Reply(replyCommand);
}
_logger.ErrorFormat(ex, "DomainException on command {0} [MessageId: {1}] : {2} : {3}", message.GetType(), message.MessageId, message.Describe(), ex.Message);
}
catch (Exception ex)
{
_logger.ErrorFormat(ex, "Generic Exception on command {0} [MessageId: {1}] : {2} : {3}", message.GetType(), message.MessageId, message.Describe(), ex.Message);
_messagesTracker.Failed(message.MessageId, DateTime.UtcNow, ex);
throw; //rethrow exception.
}
}
if (done == false)
{
_logger.ErrorFormat("Too many conflict on command {0} [MessageId: {1}] : {2}", message.GetType(), message.MessageId, message.Describe());
var exception = new Exception("Command failed. Too many Conflicts");
_messagesTracker.Failed(message.MessageId, DateTime.UtcNow, exception);
}
if (Logger.IsDebugEnabled)
{
Logger.DebugFormat("Handled {0} {1} {3}", message.GetType().FullName, message.MessageId, message.Describe());
}
}
finally
{
Logger.ClearCommandExecution();
}
}