public override void Run()
{
Trace.TraceInformation("Listening for queue messages...");
while (true)
{
try
{
// retrieve a new message from the queue
CloudQueueMessage msg = this.queue.GetMessage();
if (msg != null)
{
// parse message retrieved from queue
var messageParts = msg.AsString.Split(new char[] { ',' });
var imageBlobUri = messageParts[0];
var partitionKey = messageParts[1];
var rowkey = messageParts[2];
Trace.TraceInformation("Processing image in blob '{0}'.", imageBlobUri);
string thumbnailBlobUri = System.Text.RegularExpressions.Regex.Replace(imageBlobUri, "([^\\.]+)(\\.[^\\.]+)?$", "$1-thumb$2");
CloudBlob inputBlob = this.container.GetBlobReference(imageBlobUri);
CloudBlob outputBlob = this.container.GetBlobReference(thumbnailBlobUri);
using (BlobStream input = inputBlob.OpenRead())
using (BlobStream output = outputBlob.OpenWrite())
{
this.ProcessImage(input, output);
// commit the blob and set its properties
output.Commit();
outputBlob.Properties.ContentType = "image/jpeg";
outputBlob.SetProperties();
// update the entry in table storage to point to the thumbnail
GuestBookDataSource ds = new GuestBookDataSource();
ds.UpdateImageThumbnail(partitionKey, rowkey, thumbnailBlobUri);
// remove message from queue
this.queue.DeleteMessage(msg);
Trace.TraceInformation("Generated thumbnail in blob '{0}'.", thumbnailBlobUri);
}
}
else
{
System.Threading.Thread.Sleep(1000);
}
}
catch (StorageClientException e)
{
Trace.TraceError("Exception when processing queue item. Message: '{0}'", e.Message);
System.Threading.Thread.Sleep(5000);
}
}
}
public override void Run()
{
// This is a sample worker implementation. Replace with your logic.
Trace.TraceInformation("GuestBook_WorkerRole entry point is called", "Information");
while (true)
{
try
{
// TODO: Retrieve a new message from the queue
CloudQueueMessage newMessage = _queueStorage.GetNewMessage();
if (newMessage != null)
{
var newMessageParts = newMessage.AsString.Split(new [] {','});
var imageBlobName = newMessageParts[0];
var partitionKey = newMessageParts[1];
var rowKey = newMessageParts[2];
Trace.TraceInformation("Processing image in blob '{0}'", imageBlobName);
string thumbnailName = System.Text.RegularExpressions.Regex.Replace(imageBlobName, "([^\\.]+)(\\.[^\\.]+)?$", "$1-thumb$2");
Trace.TraceInformation("Generated Thumbnail name = '{0}'", thumbnailName);
CloudBlockBlob inputBlob = _blobStorage.GetBlockBlobReference(imageBlobName);
CloudBlockBlob outputBlob = _blobStorage.GetBlockBlobReference(thumbnailName);
using(Stream inputStream = inputBlob.OpenRead())
using (Stream outputStream = outputBlob.OpenWrite())
{
processImage(inputStream, outputStream);
outputBlob.Properties.ContentType = inputBlob.Properties.ContentType;
string outputBlobUri = outputBlob.Uri.ToString();
// Update related Guestbook entry in the table storage to point to the thumbnail's Uri
GuestBookDataSource guestBookDataSource = new GuestBookDataSource();
guestBookDataSource.UpdateImageThumbnail(partitionKey, rowKey, outputBlobUri);
// Remove the message from queue
_queueStorage.DeleteMessage(newMessage);
Trace.TraceInformation("Generated thumbnail in blob '{0}'.", outputBlobUri);
}
}
}
catch (Exception exception)
{
Trace.TraceError("Exception when processing queue item. Message: '{0}'", exception.Message);
Thread.Sleep(5000);
}
}
}