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Here are a few little tips: Use local method variables instead of class fields when you can because this avoids the necessity of making the method synchronized (local method variables can t be altered by other threads) Make each synchronized segment as small and simple as possible Try to avoid grabbing a second lock from within a synchronized section You ll now see how these ideas apply to GameThread Using synchronization in the other two thread classes is nearly identical to how you use it in GameThread The run() method has two synchronized blocks and two other synchronized methods Listing 4-6 shows what they look like..

Summary

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In summary, this chapter went over the past and present Microsoft offerings from its Patterns & Practices group. This includes the guides, reference implementations, software factories, and application block components. Because this book primarily focuses on Enterprise Library 3.0 application block components, the other offerings are just as important and are worth understanding and possibly implementing within your own environment. Also, although this book concentrates on Enterprise Library 3.0, there are no breaking changes between the 2.0 and 3.0 versions of Enterprise Library. Most of the content on the application blocks will also apply to Enterprise Library for .NET Framework 2.0, unless otherwise noted. The next chapter will provide a high-level overview of the application block components contained in Enterprise Library 3.0. Reading the next chapter will help you determine which application block components could be useful in your applications. This way, you can skip to the chapters that you have a specific interest in. However, if you plan on going through the sample application provided with this book, you should read each chapter in order; the application adds components in each chapter, so it might have dependencies on a prior chapter s components.

Listing 4-6. Synchronized Blocks and Methods /** * restart the game after a pause. */ synchronized void resumeGame() { myShouldPause = false; notify(); } /** * stops the game. */ synchronized void requestStop() { myShouldStop = true; notify(); } /** * start the game. */ public void run() { // flush any keystrokes that occurred before the // game started: myJumpCanvas.flushKeys(); myShouldStop = false; myShouldPause = false; while(true) { if(myShouldStop) { break; } synchronized(this) { while(myShouldPause) { try { wait(); } catch(Exception e) {} } } myJumpCanvas.checkKeys(); myJumpCanvas.advance(); // you do a very short pause to allow the other thread // to update the information about which keys are pressed: // and regulate the animation speed: synchronized(this) { try { wait(getWaitTime());

== == == == ==

ince the inception of the original application blocks that Microsoft released over a period of several years beginning in 2002, many changes have taken place. These changes have made Microsoft s current Enterprise Library one of the best practices and patterns offerings yet. It contains the industry s best and standard practices, and the Microsoft patterns & practices group has been taking direct community feedback on the overall design of the components within the Enterprise Library. This chapter describes some of the specific patterns and design considerations used in creating the Enterprise Library application blocks. It is important to understand the different patterns and designs used in order to fully appreciate the Enterprise Library architecture. This chapter will also cover the extensibility features and services provided for the Enterprise Library, the application block conceptual architecture, unit testing, and migrating from earlier versions of Enterprise Library. Finally, you ll set up the sample application we ll use in this book.

} catch(Exception e) {} } } } The first thing to verify is that none of these synchronized segments can cause deadlock Clearly they can t The two methods merely set a data field and then call notify(), so they certainly return without doing anything that would cause the thread to need to grab another lock before it could continue Similarly, the two blocks in the run() method are safe because all they do is check data and then wait Waiting with a lock may seem dangerous, but in fact the thread lets go of its lock as soon as it starts waiting (and then grabs it again once it s notified), so in these blocks the thread lets go of the lock almost immediately after grabbing it The second thing to analyze is why these particular blocks are synchronized.

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