// Cancellation is handeld by TableServiceContext
public static ICancellableAsyncResult BeginExecuteAsync <T, INTERMEDIATE_TYPE>(TableCommand <T, INTERMEDIATE_TYPE> cmd, IRetryPolicy policy, OperationContext operationContext, AsyncCallback callback, object asyncState)
{
// Note all code below will reference state, not params directly, this will allow common code with async executor
ExecutionState <T> executionState = new ExecutionState <T>(cmd, policy, operationContext, callback, asyncState);
TableExecutor.AcquireContext(cmd.Context, executionState);
InitRequest <T, INTERMEDIATE_TYPE>(executionState);
return(executionState);
}
public static T ExecuteSync <T, INTERMEDIATE_TYPE>(TableCommand <T, INTERMEDIATE_TYPE> cmd, IRetryPolicy policy, OperationContext operationContext)
{
// Note all code below will reference state, not params directly, this will allow common code with async executor
ExecutionState <T> executionState = new ExecutionState <T>(cmd, policy, operationContext);
TableExecutor.AcquireContext(cmd.Context, executionState);
bool shouldRetry = false;
TimeSpan delay = TimeSpan.Zero;
try
{
// Enter Retryable Section of execution
do
{
executionState.Init();
// 0. Begin Request
TableExecutor.StartRequestAttempt(executionState);
TableExecutor.CheckTimeout <T>(executionState, true);
try
{
INTERMEDIATE_TYPE tempResult = default(INTERMEDIATE_TYPE);
try
{
Logger.LogInformational(executionState.OperationContext, SR.TraceStartRequestSync, cmd.Context.BaseUri);
tempResult = cmd.ExecuteFunc();
executionState.Result = cmd.ParseResponse(tempResult, executionState.Cmd.CurrentResult, cmd);
DataServiceResponse dataServiceResponse = tempResult as DataServiceResponse;
QueryOperationResponse queryResponse = tempResult as QueryOperationResponse;
if (dataServiceResponse != null)
{
if (dataServiceResponse.IsBatchResponse)
{
// Attempt to populate response headers
if (executionState.Req != null)
{
SetExecutionStateCommandResult(executionState, dataServiceResponse);
Logger.LogInformational(executionState.OperationContext, SR.TraceResponse, executionState.Cmd.CurrentResult.HttpStatusCode, executionState.Cmd.CurrentResult.ServiceRequestID, executionState.Cmd.CurrentResult.ContentMd5, executionState.Cmd.CurrentResult.Etag);
}
}
else
{
int index = 0;
foreach (OperationResponse operationResponse in dataServiceResponse)
{
// Attempt to populate response headers
if (executionState.Req != null)
{
SetStorageCmdRequestResults(executionState.Cmd.RequestResults.ElementAt(index), operationResponse);
Logger.LogInformational(executionState.OperationContext, SR.TraceResponse, executionState.Cmd.RequestResults.ElementAt(index).HttpStatusCode, executionState.Cmd.RequestResults.ElementAt(index).ServiceRequestID, executionState.Cmd.RequestResults.ElementAt(index).ContentMd5, executionState.Cmd.RequestResults.ElementAt(index).Etag);
index++;
}
}
}
}
else if (queryResponse != null)
{
// Attempt to populate response headers
if (executionState.Req != null)
{
SetStorageCmdRequestResults(executionState.Cmd.CurrentResult, queryResponse);
Logger.LogInformational(executionState.OperationContext, SR.TraceResponse, executionState.Cmd.CurrentResult.HttpStatusCode, executionState.Cmd.CurrentResult.ServiceRequestID, executionState.Cmd.CurrentResult.ContentMd5, executionState.Cmd.CurrentResult.Etag);
}
}
}
catch (Exception ex)
{
Logger.LogWarning(executionState.OperationContext, SR.TraceGenericError, ex.Message);
// Store exception and invoke callback here. All operations in this try would be non-retryable by default
if (executionState.ExceptionRef == null || !(executionState.ExceptionRef is StorageException))
{
executionState.ExceptionRef = ExecutorBase.TranslateDataServiceExceptionBasedOnParseError(ex, executionState.Cmd.CurrentResult, executionState.Cmd.ParseDataServiceError);
}
executionState.Result = cmd.ParseResponse(tempResult, executionState.Cmd.CurrentResult, cmd);
// clear exception
executionState.ExceptionRef = null;
}
TableExecutor.FinishRequestAttempt(executionState);
Logger.LogInformational(executionState.OperationContext, SR.TraceSuccess);
return(executionState.Result);
}
catch (Exception e)
{
TableExecutor.FinishRequestAttempt(executionState);
StorageException translatedException = ExecutorBase.TranslateDataServiceExceptionBasedOnParseError(e, executionState.Cmd.CurrentResult, executionState.Cmd.ParseDataServiceError);
executionState.ExceptionRef = translatedException;
Logger.LogInformational(executionState.OperationContext, SR.TraceRetryCheck, executionState.RetryCount, executionState.Cmd.CurrentResult.HttpStatusCode, translatedException.IsRetryable ? "yes" : "no", translatedException.Message);
shouldRetry = false;
if (translatedException.IsRetryable && (executionState.RetryPolicy != null))
{
shouldRetry = executionState.RetryPolicy.ShouldRetry(
executionState.RetryCount++,
executionState.Cmd.CurrentResult.HttpStatusCode,
executionState.ExceptionRef,
out delay,
executionState.OperationContext);
if ((delay < TimeSpan.Zero) || (delay > Constants.MaximumRetryBackoff))
{
delay = Constants.MaximumRetryBackoff;
}
}
}
if (!shouldRetry || (executionState.OperationExpiryTime.HasValue && (DateTime.Now + delay).CompareTo(executionState.OperationExpiryTime.Value) > 0))
{
Logger.LogError(executionState.OperationContext, shouldRetry ? SR.TraceRetryDecisionTimeout : SR.TraceRetryDecisionPolicy, executionState.ExceptionRef.Message);
throw executionState.ExceptionRef;
}
else
{
if (executionState.Cmd.RecoveryAction != null)
{
// I.E. Rewind stream etc.
executionState.Cmd.RecoveryAction(executionState.Cmd, executionState.ExceptionRef, executionState.OperationContext);
}
Logger.LogInformational(executionState.OperationContext, SR.TraceRetryDelay, (int)delay.TotalMilliseconds);
if (delay > TimeSpan.Zero)
{
Thread.Sleep(delay);
}
Logger.LogInformational(executionState.OperationContext, SR.TraceRetry);
}
}while (shouldRetry);
// should never get here, either return, or throw;
throw new NotImplementedException(SR.InternalStorageError);
}
finally
{
ReleaseContext(cmd.Context);
}
}