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There is another feature provided by Kerberos that is named Constrained Delegation. This feature allows the impersonated client user to access a resource on a different machine. The service user that will be performing the delegation needs to be configured in Active Directory. This configuration consists of choosing a list of services that the user is authorized to delegate on. In Figure 7-12, the WSE user is authorized to delegate credentials to the HTTP server of the MTYSVR01 computer.

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Listing 6.1 implements the Snag-It ordering scenario as the method of a stateless session bean using CMT. This is fine since the user can order only one item at a time using the Snag-It feature and no state information has to be saved between calls to the OrderManagerBean. The bean first checks to see if there are any bids on the item, and if there are none, it validates the customer s credit card, charges the customer, and removes the item from bidding. To keep the code sample as simple

@Stateless @TransactionManagement(TransactionManagementType.CONTAINER) public class OrderManagerBean { Uses CMT Injects EJB context @Resource private SessionContext context; ... @TransactionAttribute(TransactionAttributeType.REQUIRED) public void placeSnagItOrder(Item item, Customer customer){ try { Defines Transaction if (!bidsExisting(item)){ attribute for method validateCredit(customer); chargeCustomer(customer, item); removeItemFromBidding(item); } } catch (CreditValidationException cve) { context.setRollbackOnly(); } catch (CreditProcessingException cpe){ Rolls back on context.setRollbackOnly(); exception } catch (DatabaseException de) { context.setRollbackOnly(); } } }

In addition to the concrete steps I have discussed, you should keep the following general recommendations for implementing managed wrappers in mind.

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Step 2. Locate the Code 39 Functions. The functions may be listed under one of these two locations: Functions > Additional Functions > Visual Basic UFLs ...

First we tell the container that it should manage the transactions for this bean b. If we do not specify the @TransactionManagement annotation or the transactiontype element in the deployment descriptor, the container assumes that we intend to use a CMT. The EJB context is injected into the bean C. A transaction is required for the placeSnagItOrder method D and one should be started by the container when needed. If an exception stops us from completing the Snag-It order, we ask the container to roll back the transaction using the injected EJBContext object s setRollbackOnly method E. Let s take a closer look at the TransactionManagement annotation b.

The @TransactionManagement annotation specifies whether CMT or BMT is to be used for a particular bean. In our case, we specify the value TransactionManagementType.CONTAINER meaning the container should manage transactions on the

bean s behalf. If we wanted to manage transactions programmatically instead, we d specify TransactionManagementType.BEAN for the TransactionManagement value. Notably, although we have explicitly included the annotation in our example, if we leave it out the container will assume CMT anyway. When we explore BMT, it will be more obvious why a CMT is the default and most commonly used choice. Next, we ll look at the second transaction-related annotation in listing 6.1: @TransactionAttribute.

Figure 7-12. Delegation properties tab in Active Directory You have the option to trust the user for delegation to any service. This is known as Unconstrained Delegation but it is not recommended because if the security of the service is compromised it means that all the services in the network are also compromised.

As the preceding sections have shown, wrapping class hierarchies can be a work-intensive task. While it is sometimes necessary to wrap C++ classes so that you can override their virtual functions in managed classes, it is seldom useful to wrap all classes this way. Determining when a feature is really needed is key to simplifying your task. You should also avoid reinventing the wheel. Before you wrap a library, make sure that the FCL does not already provide a class with the required features. The FCL often has more features than it seems. For example, the base class library already has a bunch of encryption algorithms. You can find them in the namespace System::Security::Cryptography. If the encryption algorithm you need is already implemented by the FCL, it is not necessary to wrap it again. If there is no implementation of the algorithm you want to wrap in the FCL, but the application is not strictly bound to the algorithm provided by the native API, it is typically preferable to use one of the standard algorithms provided by the FCL.

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