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The communications and data sharing APIs in this chapter and 6 are the ones you ll probably get the most mileage out of when developing MIDP games. But there are others you might end up using depending on your application. Plus, as Java ME evolves, new options are popping up all the time. Fortunately, the designers and architects proposing new JSRs tend to be pretty careful to follow the standard communications patterns fairly closely, so once you ve got the idea, you can start using new protocols in your games as soon as you hear about them. One of the exciting new options in MIDP 3 is inter-MIDlet communication. Before MIDP 3, MIDP devices were permitted to run MIDlets concurrently, but there was no standard way for MIDlets to communicate with one another or exchange data except by writing data to some sort of persistent storage (see the File Connection vs. RMS sidebar). One of the main advances in MIDP 3, however, is all the extra support for multitasking. So MIDP 3 includes a new type of connection: the IMCConnection, the inter-MIDlet communication connection. The beauty of the IMCConnection is how perfectly it fits into the standard Java universe. The MIDlet can act as either client or server, and in terms of the code to open the connection and communicate across it, it s identical to the code you would write for Bluetooth (see the earlier section Using Bluetooth ). The difference is that registering and finding services is much easier in IMC since the system is designed and optimized for Java, unlike Bluetooth where the registry system (using UUIDs and other attributes) was designed for non-Java applications. With IMC, you build the URL from the standard identifiers for a Java application: the MIDlet name, the

CHAPTER 8 JOHNNXT IS ALIVE!

Summary

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vendor name, the version number, and the fully qualified classname of the MIDlet class (see 2). Another type of connection that fits the same socket programming pattern as Bluetooth and IMC is straight socket programming using a CommConnection. This type of connection can be used to communicate with other MIDlets or applications on the device or can be used to communicate across the Internet. Support for this type of connection is required by MIDP starting from MIDP 2. However, even though the API classes to support this type of connection are present on all MIDP 2 and 3 devices, the device itself and/or the operator s network aren t always set up to allow this type of communication through. This is another type of communication (like UDPDatagramConnection), where it s mostly useful for people who are developing for a particular target device and/or operator (see the Choosing a Protocol section in 6).

The new Validation Application Block in Enterprise Library 3.0 adds a wide range of possibilities for dealing with simple domain (business) rules in most applications. The ability of this application block to implement validation logic via attributes or via a configuration file can ease the development and maintenance of an application. The next chapter covers a new application block called the Policy Injection Application Block. It allows developers to declaratively handle common functions such as validation, exception handling, logging, and so on via policies, by simply declaring, via attributes, which objects, methods, or properties should use specific policies.

CHAPTER 8 JOHNNXT IS ALIVE!

or years, the software development community has used procedural programming and object-oriented programming in the development of software applications. Over time, the need for scalable applications that can communicate with heterogeneous systems has inspired development architectures, such as service-oriented architecture. Around the turn of the millennium, a new type of development methodology has been emerging: aspect-oriented programming. The Microsoft patterns & practices group has embraced this new development paradigm and created the Policy Injection Application Block, which is covered in this chapter. However, before diving into this new application block, it is important for you to understand what aspect-oriented programming is.

Summary

CHAPTER 8 JOHNNXT IS ALIVE!

Aspect-oriented programming attempts to aid in the separation of concerns. While procedural and object-oriented programming have taken steps to modularize this separation, aspectoriented programming takes it to a new level.

The separation of concerns is a major consideration for any programming language. In the simplest terms, a concern is a modular unit of code that has a specific purpose. All programming methodologies, in some way or another, handle the separation of concerns by encapsulating them into some entity. In procedural languages, concerns are defined within procedures. In object-oriented languages, concerns are defined within classes. However, some concerns cannot be bound to these constructs. For example, most applications require some ability to capture and handle exceptions. Typically, a developer needs to go into each method and block of code and attempt to handle exceptions that may arise. Listing 13-1 shows an example of a class with exception handling, which uses the Exception Handling Application Block in each of its methods.

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