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To keep things secure, we ll scramble the user-entered password, using it to generate a hash value, and store the hash value in the database s password field for the user. Later, when an administrative user wants to gain access to enhanced features, the program will again convert the entered password into a hash value, and compare that value to the on-record hashed password. Each .NET hashing function depends on a secret code. Since the Library Project will only perform a unidirectional encryption, and it will never ask any other program to re-encrypt the password, we ll just use the user s login name as the secret key. I decided to use the HMACSHA1 hashing class, mostly for its ability to accept a variablesize key. Although it is reported to have security issues, that shouldn t be a problem for the way that we re using it. I mean, if someone actually got into the database trying to decrypt the passwords stored in the UserName table, she would already have full access to everything in the Library system. Of course, the encryption code requires references to the System.Security. Cryptography namespace. We ll also need a reference to System.Text for some of the support code. Add the relevant Import statements to the top of the General.vb code file.
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We can now enable a release build by defining the release.build on the command line:
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Figure 18.12 The VIP swap has successfully swapped the staging and production slots. You need to provide the names of the deployments in each slot.
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12.3 Summary
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17.9 Tying it all together with AndroidManifest.xml
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You don t have to do anything special to enable the session cache. It s always on and, for the reasons shown, can t be turned off. Whenever you pass an object to save(), update(), or saveOrUpdate(), and whenever you retrieve an object using load(), find(), list(), iterate(), or filter(), that object is added to the session cache. When flush() is subsequently called, the state of that object will be synchronized with the database. If you don t want this synchronization to occur, or if you re processing a huge number of objects and need to manage memory efficiently, you can use the evict() method of the Session to remove the object and its collections from the first-level cache. There are several scenarios where this can be useful. Managing the first-level cache Consider this frequently asked question: I get an OutOfMemoryException when I try to load 100,000 objects and manipulate all of them. How can I do mass updates with Hibernate It s our view that ORM isn t suitable for mass update (or mass delete) operations. If you have a use case like this, a different strategy is almost always better: call a stored procedure in the database or use direct SQL UPDATE and DELETE statements. Don t transfer all the data to main memory for a simple operation if it can be performed more efficiently by the database. If your application is mostly mass operation use cases, ORM isn t the right tool for the job! If you insist on using Hibernate even for mass operations, you can immediately evict() each object after it has been processed (while iterating through a query result), and thus prevent memory exhaustion. To completely evict all objects from the session cache, call Session.clear(). We aren t trying to convince you that evicting objects from the first-level cache is a bad thing in general, but that good use cases are rare. Sometimes, using projection and
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Before we examine the user interface API in MIDP, we will take a closer look at application control and infrastructure. As we discussed in chapter 4, application control is provided by extending the javax.microedition.midlet.MIDlet class. Therefore, the application controllers on cell phone and pager applications will extend the MIDP abstract javax.microedition.midlet.MIDlet class. As we also saw in the last chapter, MIDlets must implement three abstract, protected methods specified by MIDlet. Namely, our applications will have to override destroyApp(boolean unconditional), startApp() and pauseApp(). MIDlets can exist in one of three states: Active, Paused and Destroyed. These abstract methods allow the application to conduct work in the transition between the states (figure 5.1).
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Notice that there s no else clause here. If the numerator and denominator are equal, the operator returns true, and exits. If they re not equal, the return statement after the if is executed, so there s no need for an else. C# insists that if you overload the equals operator, you must also overload the notequals operator (!=). It s good programming practice to have the inequality operator delegate its work to the equality operator, like this:
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Extending build notifications
In this chapter, you learned the essential distinction between entities and value types and how these concepts influence the implementation of your domain model as persistent Java classes. Entities are the coarser-grained classes of your system. Their instances have an independent lifecycle and their own identity, and they can be referenced by many
Working with mapped statements
Extending pooling concepts to caching
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