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10: Lesson Review Answers
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Lesson 1
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1. Correct Answer: A A. Correct: With per call instancing, each method called gets its own instance of the implementation object. This mode minimizes the possibility of threading issues. B. Incorrect: Per session mode is slightly less thread-safe than per call mode. Each client proxy will have its own session, but threading issues are still possible within the service methods invoked by that one proxy. C. Incorrect: Having the WCF service running in single instance mode exposes even more potential threading problems because then every single request to the service will be processed by a single instance.
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D. Incorrect: Even with the ability to control which request gets which instance, there is still a potential issue with threading. More specifically, a race condition exists if two clients are using the same as-yet uncreated instance. The race exists between the call to GetExistingInstanceContext and the corresponding InitializeInstanceContext so that some care is required to ensure that thread synchronization techniques are used. 2. Correct Answer: C A. Incorrect: With per call mode, a new instance (complete with a new need to retrieve the data) is created for each method. This is probably the least efficient technique. B. Incorrect: The per session mode will cache the information for each client proxy object, but when a new proxy object is created, a new service instance is created. C. Correct: The singleton instancing mode creates a singleton instance object. This means that the data can be retrieved once and used within the instance object, regardless of the source of the request. D. Incorrect: Although it is possible to use the instance context provider to cache the data, threading issues could arise. The provider could inject the data into the service instance, but each instance running in its own thread offers some potential problems with synchronization within the data.
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Lesson 2
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1. Correct Answer: C A. Incorrect: If you selected this answer because the throttling configuration for maxConcurrentCalls is 15, this is not the limiting parameter for the throttling. B. Incorrect: If you selected this answer because the throttling configuration for maxConcurrentInstances is 10, this is not the limiting parameter for the throttling. C. Correct: Given the settings, the limiting parameter is the number of concurrent instances allowed. With the default values, operation calls are instanced on a PerCall basis, so with five simultaneous requests, that would mean five instances of the service class are created. This is the configured throttling value. D. Incorrect: Throttling limits can apply to incoming requests. 2. Correct Answer: D A. Incorrect: By setting the IsInitializing property to true, you can ensure that a method must be called before others in the service. B. Incorrect: By setting the IsTerminating property to true, you can ensure that a method must be called after all the others in the service and that no methods can be called after it.
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Answers
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C. Incorrect: It is indeed not possible to order each of the exposed methods. Only the first and last methods can be indicated. D. Correct: There is no way to ensure that the terminating method is called. All the IsTerminating property does is make sure that no methods can be called after the method for which the IsTerminating property is set to true.
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10: Case Scenario Answers
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Case Scenario 1: Choosing the Appropriate Instancing Mode
There are really only two available options for instancing. The correct choice will depend on how many instances of the application will be running at each client. If only one application is running at each client location, the instancing mode could be set to PerSession because the one-to-one correspondence between the client and the service can be maintained with this configuration. However, if more than one instance of the application can be running at each client, a PerSession instance mode will not achieve the desired results because all the instances from one client will not be sharing a service instance. If this is the scenario, the solution would be to implement a custom IInstanceContextProvider. The logic in this provider would need to determine, based on the contents of the message, which client made the request and hand out the appropriate instance. Determination of the client could be based on the IP address from which the request came or the set of credentials used to access the service, or, as part of the client configuration, a token (such as an instance ID) could be sent along with each message.
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