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Book Overview & Buying
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Table Of Contents
Windows Azure programming patterns for Start-ups
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This section focuses on the queuing facility of the storage service. As described previously in this chapter, queues provide a reliable delivery of messages.
In the following table, the characteristics of Windows Azure queues are listed:
|
Characteristic |
Description |
|---|---|
|
Names must be lower case |
Using uppercase or lowercase characters do not affect operations on queues, though the case is preserved by the storage service. |
|
Names are at least three and at most 63 characters long | |
|
Names can only contain alphanumeric characters | |
|
No ordering guarantee; based on best-effort |
It is nondeterministic whether or not the messages are sorted in a |
|
Delivered at least once |
A message is delivered at least once. This implicitly means that it can happen that the same message appears on the queue more than once. To handle this phenomenon, your message processing needs to be idempotent (We'll see this later in this chapter). |
|
Locking and leasing |
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