Refactoring Database Access in Marauroa: Difference between revisions
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imported>Kymara m unhandy -> hard to maintain |
imported>Kymara |
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Database access in marauroa was designed for a single thread application. While this works most of the time in turn based games (yes, Stendhal is turn based internally), it prevents doing non time critical stuff in another thread. In Stendhal we have the problem that any update or delete operation to the gameEvents table that takes more than a couple of seconds, kills the server. |
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== Requirements == |
== Requirements == |
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Imagine you want to subclass the CharacterDAO with your class SomeGameCharacterDAO: |
Imagine you want to subclass the CharacterDAO with your class SomeGameCharacterDAO: |
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<source lang="java"> |
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public class SomeGameCharacterDAO extends CharacterDAO { |
public class SomeGameCharacterDAO extends CharacterDAO { |
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... |
... |
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</source> |
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You simply register it as |
You simply register it as |
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<source lang="java"> |
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DAORegistry.get().register(CharacterDAO.class, new SomeGameCharacterDAO()); |
DAORegistry.get().register(CharacterDAO.class, new SomeGameCharacterDAO()); |
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</source> |
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Note: In the register call the first parameter is the parent class you want to replace. |
Note: In the register call the first parameter is the parent class you want to replace. |
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=== What are those database adapters for? === |
=== What are those database adapters for? === |
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They are a thin layer of database abstraction. This allows us to not only support MySQL but also database systems |
They are a thin layer of database abstraction. This allows us to not only support MySQL but also database systems which don't require an external server. |
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=== Why is there a method getLastInsertId? === |
=== Why is there a method getLastInsertId? === |
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The following diff shows the complete list of changes that were required to port JMaPacman. I think it may help you to get a feeling on how to adjust your own code. |
The following diff shows the complete list of changes that were required to port JMaPacman. I think it may help you to get a feeling on how to adjust your own code. |
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<!-- |
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Don't use syntax highlighting here because it does not work well with the diff characters and bold formation |
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<source lang="java"> |
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--> |
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public class MaPacmanRPRuleProcessor implements IRPRuleProcessor |
public class MaPacmanRPRuleProcessor implements IRPRuleProcessor |
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{ |
{ |
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} |
} |
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} |
} |
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[[Category:Marauroa]] |
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