I'm trying to find a way to pass objects to the Azure Queue. I couldn't find a way to do this.
As I've seen I can pass string or byte array, which is not very comfortable for passing objects.
Is there anyway to pass custom objects to the Queue?
Thanks!
You can use the following classes as example:
[Serializable]
public abstract class BaseMessage
{
public byte[] ToBinary()
{
BinaryFormatter bf = new BinaryFormatter();
byte[] output = null;
using (MemoryStream ms = new MemoryStream())
{
ms.Position = 0;
bf.Serialize(ms, this);
output = ms.GetBuffer();
}
return output;
}
public static T FromMessage<T>(CloudQueueMessage m)
{
byte[] buffer = m.AsBytes;
T returnValue = default(T);
using (MemoryStream ms = new MemoryStream(buffer))
{
ms.Position = 0;
BinaryFormatter bf = new BinaryFormatter();
returnValue = (T)bf.Deserialize(ms);
}
return returnValue;
}
}
Then a StdQueue (a Queue that is strongly typed):
public class StdQueue<T> where T : BaseMessage, new()
{
protected CloudQueue queue;
public StdQueue(CloudQueue queue)
{
this.queue = queue;
}
public void AddMessage(T message)
{
CloudQueueMessage msg =
new CloudQueueMessage(message.ToBinary());
queue.AddMessage(msg);
}
public void DeleteMessage(CloudQueueMessage msg)
{
queue.DeleteMessage(msg);
}
public CloudQueueMessage GetMessage()
{
return queue.GetMessage(TimeSpan.FromSeconds(120));
}
}
Then, all you have to do is to inherit the BaseMessage:
[Serializable]
public class ParseTaskMessage : BaseMessage
{
public Guid TaskId { get; set; }
public string BlobReferenceString { get; set; }
public DateTime TimeRequested { get; set; }
}
And make a queue that works with that message:
CloudStorageAccount acc;
if (!CloudStorageAccount.TryParse(connectionString, out acc))
{
throw new ArgumentOutOfRangeException("connectionString", "Invalid connection string was introduced!");
}
CloudQueueClient clnt = acc.CreateCloudQueueClient();
CloudQueue queue = clnt.GetQueueReference(processQueue);
queue.CreateIfNotExist();
this._queue = new StdQueue<ParseTaskMessage>(queue);
Hope this helps!