com.mckoi.database
Class StatementCache

java.lang.Object
  extended by com.mckoi.database.StatementCache

public final class StatementCache
extends java.lang.Object

A cache that maintains a serialized set of StatementTree objects that can be deserialized on demand. The purpose of this cache is to improve the performance of queries that are run repeatedly (for example, multiple INSERT statements).

SYNCHRONIZATION: This object is safe to use over multiple threads.

Author:
Tobias Downer

Constructor Summary
StatementCache(DatabaseSystem system, int hash_size, int max_size, int clean_percentage)
          Constructs the cache.
 
Method Summary
 DebugLogger Debug()
          Returns a DebugLogger object we can use to log debug messages.
 StatementTree get(java.lang.String query_string)
          Gets a StatementTree for the query string if it is stored in the cache.
 void put(java.lang.String query_string, StatementTree statement_tree)
          Puts a new query string/StatementTree into the cache.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

StatementCache

public StatementCache(DatabaseSystem system,
                      int hash_size,
                      int max_size,
                      int clean_percentage)
Constructs the cache.

Method Detail

Debug

public final DebugLogger Debug()
Returns a DebugLogger object we can use to log debug messages.


put

public void put(java.lang.String query_string,
                StatementTree statement_tree)
Puts a new query string/StatementTree into the cache.


get

public StatementTree get(java.lang.String query_string)
Gets a StatementTree for the query string if it is stored in the cache. If it isn't stored in the cache returns null.