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A common use of interfaces is to allow runtime extensibility, perhaps to allow your users to add their own objects into the system at runtime. You would provide a public interface to your users. Your code would then be written with interface handles internally, so that your users methods are called whenever their type is loaded. To make this work, you need to dynamically load the users assembly, then call some method in that assembly that creates the objects and returns an interface handle with the user s object as the underlying type. You ll use the .NET Framework Assembly class to dynamically load the assembly, and you ll use the .NET Framework reflection functionality to get at the types in the dynamically loaded assembly. Reflection is like a souped-up version of runtime type information (RTTI) in classic C++. It s much more sophisticated than RTTI, mainly because of all the metadata that is tracked by the CLR for .NET Framework types. In fact, reflection is a key reason why writing modern applications is easier with the CLR. Because modern applications often need to be much more extensible than the monolithic applications of the past, you need to interact with types and objects at runtime that you may never have envisioned at compile time. Let s return to our example of an extensible online role-playing game. We want our users to be able to implement their own creatures or monsters within the game. We publish an interface and distribute it in an assembly in our extension kit. Our interface might look something like Listing 9-16. Our assembly would also include any classes that are used in the interface, such as the AnimationSequence2D class, the Attack class, and AttackTypeEnum referred to Listing 9-16.

Consequently, if you click the Thumbs Down button, a very quick checkmark appears, and Pandora will skip to next song, remembering to never play that song again.

But here are a few answers: When Oracle executes the tablescan, how many blocks does it try to read in a multiblock read Is it the value of MBRC, the value of db_file_multiblock_read_count, or something else Answer: Oracle still tries to use the actual value for db_file_multiblock_read_count scaled up or down if we are reading from a tablespace with a nondefault block size I actually had my db_file_multiblock_read_count set to 8, so it was silly to set the MBRC to 12, but for the purposes of the arithmetic the optimizer believed me, and then the run-time engine read the table 8 blocks at a time Where did the extra 1 come from in the I/O cost when db_file_multiblock_read_count was set to 32 I don t know.

Conceptually, Slacker Radio is similar to Pandora. This application lets you build stations around your favorite artists or choose from hundreds of existing stations to listen to. Like Pandora, Slacker Radio works on both your PC or Mac, as well as your BlackBerry.

But I have come across a couple of other places in the optimizer code where modifying the db_file_multiblock_read_count produces a change in the cost that obviously should not happen For the moment I m going to assume that the odd 1 is a strange rounding error or minor aberration until I find an example where the difference is significant and merits more attention..

Listing 9-16. An Interface to Extend the Monster Game // extension_monster.cpp namespace MonsterExtensions { // public classes AnimationSequence2D, Attack and AttackTypeEnum assumed public interface class IMonster { property String^ Name; property int Strength; property AnimationSequence2D^ Frames; Attack^ GenerateAttack(AttackTypeEnum attacktype); void DefendAttack(Attack^ attack); // etc. }; } Our users implement the interface methods for generating an attack and defending against attacks, and implement all the necessary initialization code to set values for the interface properties, as in Listing 9-17. Listing 9-17. Implementing the Monster Game Interface // mymonster.cpp #using "extension_monster.dll" using namespace System; using namespace MonsterExtensions; public ref class MyMonster : IMonster { public: virtual property String^ Name; virtual property int Strength; virtual property AnimationSequence2D^ Frames;

As you did for Pandora, you have two options for downloading Slacker. You can find Slacker in the BlackBerry App World site, or you can also go to the company s web site at www.slacker.com and download the latest build for BlackBerry. Follow the on screen instructions you find on the site to download and install the application. Accept the license agreement, and you will be Slacking in no time!

SM Join Outer table: resc: 741 cdn: 6 rcz: 50 deg: 1 resp: 741 Inner table: CHILD Alias: C resc: 2517 cdn: 68 rcz: 27 deg: 1 resp: 2517 using join:1 distribution:2 #groups:1 SORT resource Sort statistics Sort width: 58 Area size: 208896 Max Area size: Degree: 1 Blocks to Sort: 1 Row size: 65 Total Rows: Initial runs: 1 Merge passes: 0 IO Cost / pass: Total IO sort cost: 0 Total CPU sort cost: 5000699 Total Temp space used: 0 SORT resource Sort statistics Sort width: 58 Area size: 208896 Max Area size: Degree: 1 Blocks to Sort: 1 Row size: 40 Total Rows: Initial runs: 1 Merge passes: 0 IO Cost / pass: Total IO sort cost: 0 Total CPU sort cost: 5018650 Total Temp space used: 0 Merge join Cost: 3261 Resp: 3261 HA Join Outer table: resc: 741 cdn: 6 rcz: 50 deg: 1 resp: 741 Inner table: CHILD Alias: C resc: 2517 cdn: 68 rcz: 27 deg: 1 resp: 2517 using join:8 distribution:2 #groups:1 Hash join one ptn Resc: 1 Deg: 1 hash_area: 124 (max=2560) buildfrag: 1 probefrag: 1 ppasses: 1 Hash join Resc: 3259 Resp: 3259 Join result: cost: 753 cdn: 1 rcz: 77 Now joining: GREATGRANDPARENT[GGP]#3 ******* NL Join Outer table: cost: 753 cdn: 1 rcz: 77 resp: Inner table: GREATGRANDPARENT Alias: GGP Access Path: table-scan Resc: 64 Join: Resc: 818 Resp: 818 Access Path: index (unique) Index: GGP_PK rsc_cpu: 15558 rsc_io: 1 ix_sel: 1.0000e-003 ix_sel_with_filters: NL Join: resc: 754 resp: 754 Access Path: index (eq-unique) Index: GGP_PK rsc_cpu: 15758 rsc_io: 1