public override void Run()
{
TableAccessor tableAccessor = null;
BlobAccessor blobAccessor = null;
while (true)
{
#region NEW IMAGE REQUEST
var requestMsg = QueueAccessor.IsAvailable ? QueueAccessor.ImageRequestQueue.AcceptMessage<ImageRequestMessage>() : null;
if (requestMsg != null)
{
// check for possible poison message
if (requestMsg.RawMessage.DequeueCount <= requestMsg.Queue.PoisonThreshold)
{
try
{
// instantiate storage accessors
blobAccessor = new BlobAccessor(StorageBroker.GetStorageConnectionStringForAccount(requestMsg.ImageUri));
tableAccessor = new TableAccessor(StorageBroker.GetStorageConnectionStringForClient(requestMsg.ClientId));
// retrieve source image from blob storage
var imageBytes = blobAccessor.RetrieveImage(requestMsg.ImageUri);
// actual slices may be less than request if image is too small
var slices = ImageUtilities.SliceAndDice(imageBytes, requestMsg.Slices).ToList();
Byte totalSlices = (Byte)slices.Count;
if (requestMsg.Slices != totalSlices)
{
var job = tableAccessor.GetJobByRequestId(requestMsg.RequestId);
if (job != null)
{
job.Slices = totalSlices;
tableAccessor.UpdateJob(job);
}
}
// loop through each slice, storing it and submitting a message to queue
for (Byte sliceNum = 0; sliceNum < totalSlices; sliceNum++)
{
Uri slicePath = blobAccessor.StoreImage(
slices[sliceNum], BlobAccessor.SliceInputContainer, String.Format("{0}_{1:000}", requestMsg.BlobName, sliceNum));
QueueAccessor.SliceRequestQueue.SubmitMessage<SliceRequestMessage>
(requestMsg.ClientId, requestMsg.RequestId, requestMsg.ImageLibraryUri, slicePath, sliceNum, requestMsg.TileSize);
tableAccessor.WriteStatusEntry(requestMsg.RequestId,
String.Format("Dispatched slice {0} of {1}", sliceNum, totalSlices - 1));
}
// message processed successfully
requestMsg.DeleteFromQueue();
}
catch (Exception e)
{
// something really bad happened!
Trace.TraceError("Request: {0}{4}Exception: {1}{4}Message: {2}{4}Trace: {3}",
requestMsg.RequestId,
e.GetType(),
e.Message,
e.StackTrace,
Environment.NewLine);
}
}
else
{
// remove poison message from the queue
requestMsg.DeleteFromQueue();
Trace.TraceWarning("Request: {0}{4}Exception: {1}{4}Message: {2}{4}Trace: {3}",
requestMsg.RequestId,
"N/A",
String.Format("Possible poison message [id: {0}] removed from queue '{1}' after {2} attempts",
requestMsg.RawMessage.Id,
QueueAccessor.ImageRequestQueue,
QueueAccessor.ImageRequestQueue.PoisonThreshold),
"N/A",
Environment.NewLine);
}
}
#endregion
#region COMPLETED SLICE NOTIFICATION
var responseMsg = QueueAccessor.IsAvailable ? QueueAccessor.SliceResponseQueue.AcceptMessage<SliceResponseMessage>() : null;
if (responseMsg != null)
{
// check for possible poison message
if (responseMsg.RawMessage.DequeueCount <= responseMsg.Queue.PoisonThreshold)
{
try
{
// instantiate storage accessors
blobAccessor = new BlobAccessor(StorageBroker.GetStorageConnectionStringForAccount(responseMsg.SliceUri));
tableAccessor = new TableAccessor(StorageBroker.GetStorageConnectionStringForClient(responseMsg.ClientId));
// get the job data (from Azure table) indicating number of slices and the tile size
var job = tableAccessor.GetJobByRequestId(responseMsg.RequestId);
if ((job != null) && (job.Slices > 0) && (job.TileSize > 0) && (job.SourceWidth > 0) && (job.SourceHeight > 0))
{
// get slices processed so far
var processedSliceUris = blobAccessor.RetrieveImageUris(BlobAccessor.SliceOutputContainer, responseMsg.BlobName).ToList();
// if we have the expected number, this is the last slice to complete
if (processedSliceUris.Count() == (Int32)job.Slices)
{
Byte[] finalImgBytes = ImageUtilities.StitchAndMend(
processedSliceUris, blobAccessor.RetrieveImages,
(byte)job.TileSize, new Size(job.SourceWidth, job.SourceHeight));
Uri finalImageUri = blobAccessor.StoreImage(finalImgBytes, BlobAccessor.ImageOutputContainer, responseMsg.BlobName);
QueueAccessor.ImageResponseQueue.SubmitMessage<ImageResponseMessage>
(responseMsg.ClientId, responseMsg.RequestId, finalImageUri);
}
}
else
{
throw new SystemException("Metadata for job {0} in Jobs table was not found or is invalid");
}
// message processed successfully
responseMsg.DeleteFromQueue();
}
catch (Exception e)
{
// something really bad happened!
Trace.TraceError("Request: {0}{4}Exception: {1}{4}Message: {2}{4}Trace: {3}",
responseMsg.RequestId,
e.GetType(),
e.Message,
e.StackTrace,
Environment.NewLine);
}
}
else
{
// remove poison message from the queue
responseMsg.DeleteFromQueue();
Trace.TraceWarning("Request: {0}{4}Exception: {1}{4}Message: {2}{4}Trace: {3}",
responseMsg.RequestId,
"N/A",
String.Format("Possible poison message [id: {0}] removed from queue '{1}' after {2} attempts",
responseMsg.RawMessage.Id,
QueueAccessor.SliceResponseQueue,
QueueAccessor.SliceResponseQueue.PoisonThreshold),
"N/A",
Environment.NewLine);
}
}
#endregion
#region MOST SINCERELY DONE NOTIFICATION
var completeMsg = QueueAccessor.IsAvailable ? QueueAccessor.ImageResponseQueue.AcceptMessage<ImageResponseMessage>() : null;
if (completeMsg != null)
{
// check for possible poison message
if (completeMsg.RawMessage.DequeueCount <= completeMsg.Queue.PoisonThreshold)
{
try
{
// instantiate storage accessors
blobAccessor = new BlobAccessor(StorageBroker.GetStorageConnectionStringForAccount(completeMsg.ImageUri));
tableAccessor = new TableAccessor(StorageBroker.GetStorageConnectionStringForClient(completeMsg.ClientId));
// get the completed job entity from table storage
var job = tableAccessor.GetJobByRequestId(completeMsg.RequestId);
if (job != null)
{
// update pointer to completed image (and the finish time)
job.FinalImageUri = completeMsg.ImageUri.ToString();
job.FinishTime = DateTime.UtcNow;
tableAccessor.UpdateJob(job);
tableAccessor.WriteStatusEntry(completeMsg.RequestId, "Request complete.");
}
else
{
Trace.TraceWarning("Request: {0}{4}Exception: {1}{4}Message: {2}{4}Trace: {3}",
completeMsg.RequestId,
"N/A",
"Request completed, but record not found in Jobs table",
"N/A",
Environment.NewLine);
}
// only notify user (or try to) once!
if (completeMsg.RawMessage.DequeueCount == 1)
{
try
{
// notify via service bus that request is complete
if (job != null)
{
Notifier.SendRequestCompletedNotification(
job.ClientId,
completeMsg.RequestId,
completeMsg.ImageUri);
}
}
catch (Exception e)
{
Trace.TraceWarning("Request: {0}{4}Exception: {1}{4}Message: {2}{4}Trace: {3}",
completeMsg.RequestId,
e.GetType(),
e.Message,
e.StackTrace,
Environment.NewLine);
}
}
// message processed successfully
completeMsg.DeleteFromQueue();
}
catch (Exception e)
{
// something really bad happened!
Trace.TraceError("Request: {0}{4}Exception: {1}{4}Message: {2}{4}Trace: {3}",
completeMsg.RequestId,
e.GetType(),
e.Message,
e.StackTrace,
Environment.NewLine);
}
}
else
{
// remove poison m essage from the queue
completeMsg.DeleteFromQueue();
Trace.TraceWarning("Request: {0}{4}Exception: {1}{4}Message: {2}{4}Trace: {3}",
completeMsg.RequestId,
"N/A",
String.Format("Possible poison message [id: {0}] removed from queue '{1}' after {2} attempts",
completeMsg.RawMessage.Id,
QueueAccessor.ImageResponseQueue,
QueueAccessor.ImageResponseQueue.PoisonThreshold),
"N/A",
Environment.NewLine);
}
}
#endregion
// only sleep if we didn't do anything this time through
if ((requestMsg == null) && (responseMsg == null) && (completeMsg == null))
{
Thread.Sleep(10000);
}
}
}
public override void Run()
{
TableAccessor tableAccessor = null;
BlobAccessor blobAccessor = null;
while (true)
{
#region NEW IMAGE REQUEST
var requestMsg = QueueAccessor.IsAvailable ? QueueAccessor.ImageRequestQueue.AcceptMessage <ImageRequestMessage>() : null;
if (requestMsg != null)
{
// check for possible poison message
if (requestMsg.RawMessage.DequeueCount <= requestMsg.Queue.PoisonThreshold)
{
try
{
// instantiate storage accessors
blobAccessor = new BlobAccessor(StorageBroker.GetStorageConnectionStringForAccount(requestMsg.ImageUri));
tableAccessor = new TableAccessor(StorageBroker.GetStorageConnectionStringForClient(requestMsg.ClientId));
// retrieve source image from blob storage
var imageBytes = blobAccessor.RetrieveImage(requestMsg.ImageUri);
// actual slices may be less than request if image is too small
var slices = ImageUtilities.SliceAndDice(imageBytes, requestMsg.Slices).ToList();
Byte totalSlices = (Byte)slices.Count;
if (requestMsg.Slices != totalSlices)
{
var job = tableAccessor.GetJobByRequestId(requestMsg.RequestId);
if (job != null)
{
job.Slices = totalSlices;
tableAccessor.UpdateJob(job);
}
}
// loop through each slice, storing it and submitting a message to queue
for (Byte sliceNum = 0; sliceNum < totalSlices; sliceNum++)
{
Uri slicePath = blobAccessor.StoreImage(
slices[sliceNum], BlobAccessor.SliceInputContainer, String.Format("{0}_{1:000}", requestMsg.BlobName, sliceNum));
QueueAccessor.SliceRequestQueue.SubmitMessage <SliceRequestMessage>
(requestMsg.ClientId, requestMsg.RequestId, requestMsg.ImageLibraryUri, slicePath, sliceNum, requestMsg.TileSize);
tableAccessor.WriteStatusEntry(requestMsg.RequestId,
String.Format("Dispatched slice {0} of {1}", sliceNum, totalSlices - 1));
}
// message processed successfully
requestMsg.DeleteFromQueue();
}
catch (Exception e)
{
// something really bad happened!
Trace.TraceError("Request: {0}{4}Exception: {1}{4}Message: {2}{4}Trace: {3}",
requestMsg.RequestId,
e.GetType(),
e.Message,
e.StackTrace,
Environment.NewLine);
}
}
else
{
// remove poison message from the queue
requestMsg.DeleteFromQueue();
Trace.TraceWarning("Request: {0}{4}Exception: {1}{4}Message: {2}{4}Trace: {3}",
requestMsg.RequestId,
"N/A",
String.Format("Possible poison message [id: {0}] removed from queue '{1}' after {2} attempts",
requestMsg.RawMessage.Id,
QueueAccessor.ImageRequestQueue,
QueueAccessor.ImageRequestQueue.PoisonThreshold),
"N/A",
Environment.NewLine);
}
}
#endregion
#region COMPLETED SLICE NOTIFICATION
var responseMsg = QueueAccessor.IsAvailable ? QueueAccessor.SliceResponseQueue.AcceptMessage <SliceResponseMessage>() : null;
if (responseMsg != null)
{
// check for possible poison message
if (responseMsg.RawMessage.DequeueCount <= responseMsg.Queue.PoisonThreshold)
{
try
{
// instantiate storage accessors
blobAccessor = new BlobAccessor(StorageBroker.GetStorageConnectionStringForAccount(responseMsg.SliceUri));
tableAccessor = new TableAccessor(StorageBroker.GetStorageConnectionStringForClient(responseMsg.ClientId));
// get the job data (from Azure table) indicating number of slices and the tile size
var job = tableAccessor.GetJobByRequestId(responseMsg.RequestId);
if ((job != null) && (job.Slices > 0) && (job.TileSize > 0) && (job.SourceWidth > 0) && (job.SourceHeight > 0))
{
// get slices processed so far
var processedSliceUris = blobAccessor.RetrieveImageUris(BlobAccessor.SliceOutputContainer, responseMsg.BlobName).ToList();
// if we have the expected number, this is the last slice to complete
if (processedSliceUris.Count() == (Int32)job.Slices)
{
Byte[] finalImgBytes = ImageUtilities.StitchAndMend(
processedSliceUris, blobAccessor.RetrieveImages,
(byte)job.TileSize, new Size(job.SourceWidth, job.SourceHeight));
Uri finalImageUri = blobAccessor.StoreImage(finalImgBytes, BlobAccessor.ImageOutputContainer, responseMsg.BlobName);
QueueAccessor.ImageResponseQueue.SubmitMessage <ImageResponseMessage>
(responseMsg.ClientId, responseMsg.RequestId, finalImageUri);
}
}
else
{
throw new SystemException("Metadata for job {0} in Jobs table was not found or is invalid");
}
// message processed successfully
responseMsg.DeleteFromQueue();
}
catch (Exception e)
{
// something really bad happened!
Trace.TraceError("Request: {0}{4}Exception: {1}{4}Message: {2}{4}Trace: {3}",
responseMsg.RequestId,
e.GetType(),
e.Message,
e.StackTrace,
Environment.NewLine);
}
}
else
{
// remove poison message from the queue
responseMsg.DeleteFromQueue();
Trace.TraceWarning("Request: {0}{4}Exception: {1}{4}Message: {2}{4}Trace: {3}",
responseMsg.RequestId,
"N/A",
String.Format("Possible poison message [id: {0}] removed from queue '{1}' after {2} attempts",
responseMsg.RawMessage.Id,
QueueAccessor.SliceResponseQueue,
QueueAccessor.SliceResponseQueue.PoisonThreshold),
"N/A",
Environment.NewLine);
}
}
#endregion
#region MOST SINCERELY DONE NOTIFICATION
var completeMsg = QueueAccessor.IsAvailable ? QueueAccessor.ImageResponseQueue.AcceptMessage <ImageResponseMessage>() : null;
if (completeMsg != null)
{
// check for possible poison message
if (completeMsg.RawMessage.DequeueCount <= completeMsg.Queue.PoisonThreshold)
{
try
{
// instantiate storage accessors
blobAccessor = new BlobAccessor(StorageBroker.GetStorageConnectionStringForAccount(completeMsg.ImageUri));
tableAccessor = new TableAccessor(StorageBroker.GetStorageConnectionStringForClient(completeMsg.ClientId));
// get the completed job entity from table storage
var job = tableAccessor.GetJobByRequestId(completeMsg.RequestId);
if (job != null)
{
// update pointer to completed image (and the finish time)
job.FinalImageUri = completeMsg.ImageUri.ToString();
job.FinishTime = DateTime.UtcNow;
tableAccessor.UpdateJob(job);
tableAccessor.WriteStatusEntry(completeMsg.RequestId, "Request complete.");
}
else
{
Trace.TraceWarning("Request: {0}{4}Exception: {1}{4}Message: {2}{4}Trace: {3}",
completeMsg.RequestId,
"N/A",
"Request completed, but record not found in Jobs table",
"N/A",
Environment.NewLine);
}
// only notify user (or try to) once!
if (completeMsg.RawMessage.DequeueCount == 1)
{
try
{
// notify via service bus that request is complete
if (job != null)
{
Notifier.SendRequestCompletedNotification(
job.ClientId,
completeMsg.RequestId,
completeMsg.ImageUri);
}
}
catch (Exception e)
{
Trace.TraceWarning("Request: {0}{4}Exception: {1}{4}Message: {2}{4}Trace: {3}",
completeMsg.RequestId,
e.GetType(),
e.Message,
e.StackTrace,
Environment.NewLine);
}
}
// message processed successfully
completeMsg.DeleteFromQueue();
}
catch (Exception e)
{
// something really bad happened!
Trace.TraceError("Request: {0}{4}Exception: {1}{4}Message: {2}{4}Trace: {3}",
completeMsg.RequestId,
e.GetType(),
e.Message,
e.StackTrace,
Environment.NewLine);
}
}
else
{
// remove poison m essage from the queue
completeMsg.DeleteFromQueue();
Trace.TraceWarning("Request: {0}{4}Exception: {1}{4}Message: {2}{4}Trace: {3}",
completeMsg.RequestId,
"N/A",
String.Format("Possible poison message [id: {0}] removed from queue '{1}' after {2} attempts",
completeMsg.RawMessage.Id,
QueueAccessor.ImageResponseQueue,
QueueAccessor.ImageResponseQueue.PoisonThreshold),
"N/A",
Environment.NewLine);
}
}
#endregion
// only sleep if we didn't do anything this time through
if ((requestMsg == null) && (responseMsg == null) && (completeMsg == null))
{
Thread.Sleep(10000);
}
}
}
