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OK, here you are going to do some math. If you don t like math, then look away now. What you are doing is grabbing three values between 0 and 1. This should give us a point anywhere in the unit cube. Next you will check to see whether it is inside the unit radius from 0,0 by checking the length of the vector against 1 (technically 1 squared). If it falls outside the unit radius, then you normalize it.

The one difference between get() and load() is how they indicate that the instance could not be found If no row with the given identifier value exists in the database, get() returns null The load() method throws an ObjectNotFoundException It s your choice what error-handling you prefer More important, the load() method may return a proxy, a placeholder, without hitting the database A consequence of this is that you may get an ObjectNotFoundException later, as soon as you try to access the returned placeholder and force its initialization (this is also called lazy loading; we discuss load optimization in later chapters) The load() method always tries to return a proxy, and only returns an initialized object instance if it s already managed by the current persistence context.

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When troubleshooting agents, you should consider the following valuable resource kit tools. MOMInfo.exe allows you to do the following: Export the rules, responses, and VarSet values at the MOM agent into an XML file. Clear the queues on the agent. Place the agent into maintenance mode. This has to be run locally on the agent. Enable script debugging. RSOR.exe allows you to create a text file showing the set of rules that would be deployed to an agent. This will not show any overrides that my be applied. MOMClusterTool.exe helps diagnose why a Windows Server cluster virtual server cannot be detected by MOM. CleanupMOM.exe will remove the MOM installation on the agent. This will not remove the details of the agent on the management server.

In the example shown earlier, no database hit occurs at all! The get() method on the other hand never returns a proxy, it always hits the database You may ask why this option is useful after all, you retrieve an object to access it It s common to obtain a persistent instance to assign it as a reference to another instance For example, imagine that you need the item only for a single purpose: to set an association with a Comment: aCommentsetForAuction(item) If this is all you plan to do with the item, a proxy will do fine; there is no need to hit the database In other words, when the Comment is saved, you need the foreign key value of an item inserted into the COMMENT table The proxy of an Item provides just that: an identifier value wrapped in a placeholder that looks like the real thing.

Modifying a persistent object Any persistent object returned by get(), load(), or any entity queried is already associated with the current Session and persistence context It can be modified, and its state is synchronized with the database (see listing 94) Figure 96 shows this unit of work and the object transitions..

NOTE: To upload a video to MobileMe or YouTube, you need to have an account with the site you want to upload to. See 4: Other Sync Methods to learn more about MobileMe.

If your previous applications didn t include tests for your domain model, you should reconsider your position. Remember, your domain model is the heart of your software; but unlike the presentation layer, a broken domain model may not be easily visible. Note that when you re unit testing your domain model, the units are the entities. Globally, you can use two kinds of tests: data-integrity tests and logic tests. Let s take a simple example of each and see how you can use NUnit. To make it even more fun, we apply TDD. Data-integrity tests are simple tests to make sure the entities content is valid (according to the business logic) and remains valid, no matter what happens. For example, suppose you have a User entity in your domain model, and its name is mandatory; and because it s stored in the database, this name must not exceed a certain number of characters (let s say 64). Listing 8.1 shows three tests to codify this specification.

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