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little information has surfaced, it seems there will be some support for using MySQL to manage distributed transactions (across remote machines or multiple databases) using the X/Open model (or XA). We encourage you to check mailing lists and the MySQL web site for more information about this emerging functionality.

private boolean isColliding() { BoundingSphere[] bs = rightGrabber.getArmBounds(); if (leftGrabber.touches(bs)) // arms touching each other return true; // check the right arm against the obstacles if (obs.intersects(bs)) return true; // check the left arm against obstacles

As discussed in the previous section, this process will increase the frequency of the garbage collection operation and cause the game performance to suffer The collection types that suffer this problem are all nongeneric collections and the generic Collection<T> object For code inside your game loop (anywhere inside the Update or Draw methods), you should either avoid using these collection types or iterate through them with a for loop instead of a foreach loop It is fine to use foreach for arrays and all other generic collection types, however Also be aware that when you do use for loops, if you include a method or property call for the end condition of the loop, your compiled code will call into it for every iteration of the loop.

Summary

bs = leftGrabber.getArmBounds(); if (obs.intersects(bs)) return true; // are either arms touching the ground if (leftGrabber.touchingGround()) return true; if (rightGrabber.touchingGround()) return true; return false; // end of isColliding()

It is, therefore, a good idea to read the collection size into a local variable prior to entering the loop and use it in your for loop instead You can see this in the GameHostUpdate method back in Listing 3 12: the GameObjectsCount value is read into a local variable, and the variable is used in the loop rather than the collection property..

We covered a lot of ground in this chapter Although we walked through some exercises specific to the MySQL database server, the vast majority of the fundamentals covered here are applicable to most database servers This fundamental knowledge will help you evaluate MySQL s ability to provide true transaction-safe capability to your applications, and give you insight on the benefits and drawbacks of transaction processing We covered the ACID test, and went over how this acronym refers to a measure of how a database server s transaction processing system works to ensure the viability of transactions executed against it Some of the diagrams in the earlier part of the chapter gave you a visual picture of how a failure can affect a transactional system, and how the recovery and logging systems of the database server work to alleviate the trouble caused by failures.

The Grabber methods, getArmBounds(), touches(), and touchingGround() are the same as in 4. The Obstacles method, intersects(), was described earlier.

Game in Focus: Cosmic Rocks (Part I)

The topic of transaction isolation is closely related to issues of concurrency You learned how locking systems work to shield multiple processes from interfering with a certain resource and saw how the different granularities of locks, and type of lock, affect concurrency issues From there, we dove into some practical examples of concurrency concerns, by executing different schedules of transactions using multiple user connections These examples helped you to see the real-life effects of isolation levels and locking concepts We also took a look at how deadlocks occur and why Our discussion of multiversion concurrency control (MVCC) showed you how the InnoDB storage engine manages to provide data isolation to concurrently executing transactions through a system of row-level version tracking Finally, we addressed the question of whether all this transactional ability is really necessary.

At the end of this and the next couple of chapters, we will start to build the material that we have covered into a simple game. The game, which is called Cosmic Rocks, is essentially an Asteroids clone. In this chapter, we will cover the basic game design and implement the sprite processing into the game engine. We haven t yet discussed user input (which is covered in the next chapter), so the game won t be interactive yet, but you will see the beginnings of a playable game lurking at the end of this chapter. All the code and resources for the game can be found in the CosmicRocksPartI example project.