November 2008
Intermediate to advanced
784 pages
23h 28m
English
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Delivery Failures
As discussed in Chapter 6, a connected call may fail due to either communication failures or service-side errors. Similarly, a queued call can fail due to delivery failures or service-side playback errors. WCF provides dedicated error-handling mechanisms for both types of errors, and understanding them and integrating your error-handling logic with them is an intrinsic part of using queued services.
While MSMQ can guarantee delivery of a message if it is technically possible to do so, there are multiple examples of when it is not possible to deliver the message. These include but are not limited to:
- Timeouts and expiration
As you will see shortly, each message has a timestamp, and the message has to be delivered and processed within the configured timeout. Failure to do so will cause the delivery to fail.
- Security mismatches
If the security credentials in the message (or the chosen authentication mechanism itself) do not match up with what the service expects, the service will reject the message.
- Transactional mismatches
The client cannot use a local nontransactional queue while posting a message to a transactional service-side queue.
- Network problems
If the underlying network fails or is simply unreliable, the message may never reach the service.
- Machine crashes
The service machine may crash due to software or hardware failures and will not be able to accept the message to its queue.
- Purges
Even if the message is delivered successfully, the administrator (or any ...
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