Package com.mckoi.database
Class StatementCache
- java.lang.Object
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- com.mckoi.database.StatementCache
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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
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Constructor Summary
Constructors Constructor Description StatementCache(DatabaseSystem system, int hash_size, int max_size, int clean_percentage)
Constructs the cache.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description 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.
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Constructor Detail
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StatementCache
public StatementCache(DatabaseSystem system, int hash_size, int max_size, int clean_percentage)
Constructs the cache.
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Method Detail
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Debug
public final DebugLogger Debug()
Returns a DebugLogger object we can use to log debug messages.
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put
public void put(java.lang.String query_string, StatementTree statement_tree)
Puts a new query string/StatementTree into the cache.
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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.
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