private T ExecuteFallback()
{
if (FallbackExecutionSemaphore.TryAcquire())
{
try
{
var rtn = ToIFallback().GetFallback();
Metrics.MarkExecutionEvent(CommandExecutionEventEnum.FallbackSuccess);
Status = CommandStatusEnum.FallbackSuccess;
Log.Log(LogLevelEnum.Warning, "HystrixCommand execution failed, use fallback instead.");
return(rtn);
}
catch (Exception ex)
{
Log.Log(LogLevelEnum.Error, "HystrixCommand fallback execution failed.", ex,
GetLogTagInfo().AddLogTagData("FXD303038"));
Metrics.MarkExecutionEvent(CommandExecutionEventEnum.FallbackFailed);
Status = CommandStatusEnum.FallbackFailed;
throw ex;
}
finally
{
FallbackExecutionSemaphore.Release();
}
}
else
{
var fRejectMsg = "HystrixCommand fallback execution was rejected.";
Log.Log(LogLevelEnum.Error, fRejectMsg, GetLogTagInfo().AddLogTagData("FXD303039"));
Metrics.MarkExecutionEvent(CommandExecutionEventEnum.FallbackRejected);
Status = CommandStatusEnum.FallbackRejected;
throw new HystrixException(FailureTypeEnum.FallbackRejected, this.GetType(), Key, fRejectMsg);
}
}
private T ExecuteFallback(Exception cause)
{
if (cause is HystrixException && cause.InnerException != null)
{
cause = cause.InnerException;
}
if (FallbackExecutionSemaphore.TryAcquire())
{
try
{
T result = ToIFallback().GetFallback();
Metrics.MarkExecutionEvent(CommandExecutionEventEnum.FallbackSuccess);
Status = CommandStatusEnum.FallbackSuccess;
Log.Log(LogLevelEnum.Warning, "HystrixCommand execution failed, use fallback instead.");
return(result);
}
catch (Exception ex)
{
Metrics.MarkExecutionEvent(CommandExecutionEventEnum.FallbackFailed);
Status = CommandStatusEnum.FallbackFailed;
if (ConfigSet.LogExecutionError)
{
Log.Log(LogLevelEnum.Error, "HystrixCommand fallback execution failed.", ex, GetLogTagInfo().AddLogTagData("FXD303024"));
}
throw;
}
finally
{
FallbackExecutionSemaphore.Release();
}
}
else
{
Status = CommandStatusEnum.FallbackRejected;
Metrics.MarkExecutionEvent(CommandExecutionEventEnum.FallbackRejected);
string errorMessage = "HystrixCommand fallback execution was rejected.";
Log.Log(LogLevelEnum.Error, errorMessage, GetLogTagInfo().AddLogTagData("FXD303025"));
throw new HystrixException(FailureTypeEnum.FallbackRejected, GetType(), Key, errorMessage, cause);
}
}
private T ExecuteWithSemaphoreIsolation()
{
if (!CircuitBreaker.AllowRequest())
{
string errorMessage = "Circuit Breaker is open. Execution was short circuited.";
Log.Log(LogLevelEnum.Error, errorMessage, GetLogTagInfo().AddLogTagData("FXD303019"));
Status = CommandStatusEnum.ShortCircuited;
Metrics.MarkExecutionEvent(CommandExecutionEventEnum.ShortCircuited);
throw new HystrixException(FailureTypeEnum.ShortCircuited, this.GetType(), Key, errorMessage);
}
if (ExecutionSemaphore.TryAcquire())
{
Stopwatch stopwatch = new Stopwatch();
try
{
stopwatch.Start();
Status = CommandStatusEnum.Started;
T result = Execute();
stopwatch.Stop();
if (stopwatch.ElapsedMilliseconds > ConfigSet.CommandTimeoutInMilliseconds)
{
Status = CommandStatusEnum.Timeout;
Metrics.MarkExecutionEvent(CommandExecutionEventEnum.Timeout);
Log.Log(LogLevelEnum.Warning, string.Format("HystrixCommand execution timeout: {0}ms.", stopwatch.ElapsedMilliseconds),
GetLogTagInfo().AddLogTagData("FXD303020"));
}
else
{
Status = CommandStatusEnum.Success;
Metrics.MarkExecutionEvent(CommandExecutionEventEnum.Success);
CircuitBreaker.MarkSuccess();
}
return(result);
}
catch (Exception ex)
{
if (ex.IsBadRequestException())
{
Status = CommandStatusEnum.Failed;
Metrics.MarkExecutionEvent(CommandExecutionEventEnum.BadRequest);
if (ConfigSet.LogExecutionError)
{
Log.Log(LogLevelEnum.Error, "HystrixCommand request is bad.", ex, GetLogTagInfo().AddLogTagData("FXD303021"));
}
throw;
}
Status = CommandStatusEnum.Failed;
Metrics.MarkExecutionEvent(CommandExecutionEventEnum.Failed);
if (ConfigSet.LogExecutionError)
{
Log.Log(LogLevelEnum.Error, "HystrixCommand execution failed.", ex, GetLogTagInfo().AddLogTagData("FXD303022"));
}
throw;
}
finally
{
ExecutionSemaphore.Release();
stopwatch.Stop();
Metrics.MarkExecutionLatency(stopwatch.ElapsedMilliseconds);
}
}
else
{
Status = CommandStatusEnum.Rejected;
Metrics.MarkExecutionEvent(CommandExecutionEventEnum.Rejected);
string errorMessage = "HystrixCommand execution was rejected.";
Log.Log(LogLevelEnum.Error, errorMessage, GetLogTagInfo().AddLogTagData("FXD303023"));
throw new HystrixException(FailureTypeEnum.SemaphoreIsolationRejected, GetType(), Key, errorMessage);
}
}
