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With this definition, we know now that, if the container detects a system exception, such as an ArithmeticException, ClassCastException, IllegalArgumentException, or NullPointerException, it will roll back the transaction. Application exceptions depend on various factors. As an example, let s change the code from Listing 9-3 and use an application exception as shown in Listing 9-4. Listing 9-4. A Stateless Bean Throwing an Application Exception @Stateless public class InventoryEJB { @PersistenceContext(unitName = "chapter09PU") private EntityManager em; public void oneItemSold(Item item) throws InventoryLevelTooLowException{ item.decreaseAvailableStock(); sendShippingMessage(); if (inventoryLevel(item) == 0) throw new InventoryLevelTooLowException(); } } InventoryLevelTooLowException is an application exception because it s related to the business logic of the oneItemSold() method. It is then a business concern to know whether you want to roll back the transaction or not. An application exception is one that extends from a checked or unchecked exception, and is annotated with @javax.ejb.ApplicationException (or the XML equivalent in the deployment descriptor). This annotation has a rollback element that can be set to true to explicitly roll back the transaction. Listing 9-5 shows the InventoryLevelTooLowException as an annotated checked exception. Listing 9-5. An Application Exception with rollback = true @ApplicationException(rollback = true) public class InventoryLevelTooLowException extends Exception { public InventoryLevelTooLowException() { } public InventoryLevelTooLowException(String message) { super(message); } } If the InventoryEJB in Listing 9-4 throws the exception defined in Listing 9-5, it will mark the transaction for rollback, and the container will do the actual rollback when it is time to end the

The following list indicates some of the things to address: Resource and Employee could be duplicates. It isn t clear that Resource adds anything to Employee, so the two can probably be merged into one class. Based on the use case description, we know that RoleList is a name/value list, which directly implies the Role is just a name/value placeholder. Given Csla.NameValueListBase, this can be simplified. The relationship between Project, ProjectResources, Resource, and ResourceAssignments is very complex. In fact, it forms a loop of references, which is always a danger sign. The RoleList object isn t used by any other objects in the model. Given that the use cases indicate that resources are assigned to projects based on a specific role, this is suspicious. The use cases for ProjectList and ResourceList indicate that they re primarily used for selection of objects, not for editing all the projects or resources in the system. Actually loading all the Project or Resource objects just so that the user can make a simple selection is expensive, performance-wise, so this design should be reviewed. It is clear that when the list of roles is edited, any RoleList objects need to know about the changes so that they can read the new data. This is not explicitly stated in a use case, but is an inferred requirement. In the early stages of any object-design process, there will be duplicate objects, or potential objects that end up being mere data fields in other objects. Usually, a great deal of debate will ensue during the design phase as all the people involved in the design process thrash out which objects

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are real, which are duplicates, and which should be just data fields. This is healthy and important, though obviously some judgment must be exercised to avoid analysis paralysis, whereby the design stalls entirely due to the debate. Let s discuss this in a bit more detail.

transaction. That s because the InventoryLevelTooLowException is annotated with @ApplicationException(rollback = true). Table 9-4 shows all the possible combinations with application exceptions. The first line of the table could be interpreted as If the application exception extends from Exception and has no @ApplicationException annotation, throwing it will not mark the transaction for rollback. Table 9-4. Combination of Application Exceptions

First, you should identify duplicate objects that have basically the same data and relationships (like Resource and Employee). In this case, Employee can be eliminated in favor of Resource, since that s the term used most often in the use case descriptions (and thus, presumably, most used by the end users). In most scenarios, the end users will have numerous terms for some of their concepts. It s your job, as part of the analysis process, to identify when multiple terms really refer to the same concepts (objects) and to clarify and abstract the appropriate meaning.

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The Role object may not be required either. Fundamentally, a Role is just a string value, presumably with an associated key value. This is the specific scenario for which the NameValueListBase class in the CSLA .NET framework is designed. That base class makes it easy to implement name/value lists.

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