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hibernate-orm
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ColumnName cache now uses a map which supports multithreaded access. 

The implementation now uses ConcurrentHashMap which provides faster multithreaded gets and safe writes.
This commit is contained in:
CodingFabian 2011-09-15 15:11:44 +02:00 committed by Strong Liu
parent 999526c3c3
commit 2a15694fa1
1 changed files with 4 additions and 4 deletions
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8
hibernate-core/src/main/java/org/hibernate/engine/jdbc/ColumnNameCache.java
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@ -24,7 +24,7 @@
package org.hibernate.engine.jdbc; package org.hibernate.engine.jdbc;
import java.sql.ResultSet; import java.sql.ResultSet;
import java.sql.SQLException; import java.sql.SQLException;
import java.util.HashMap; import java.util.concurrent.ConcurrentHashMap;
import java.util.Map; import java.util.Map;
/** /**
@ -35,11 +35,11 @@ import java.util.Map;
public class ColumnNameCache { public class ColumnNameCache {
public static final float LOAD_FACTOR = .75f; public static final float LOAD_FACTOR = .75f;
private final Map columnNameToIndexCache; private final Map<String, Integer> columnNameToIndexCache;
public ColumnNameCache(int columnCount) { public ColumnNameCache(int columnCount) {
// should *not* need to grow beyond the size of the total number of columns in the rs // should *not* need to grow beyond the size of the total number of columns in the rs
this.columnNameToIndexCache = new HashMap( columnCount + (int)( columnCount * LOAD_FACTOR ) + 1, LOAD_FACTOR ); this.columnNameToIndexCache = new ConcurrentHashMap<String, Integer>( columnCount + (int)( columnCount * LOAD_FACTOR ) + 1, LOAD_FACTOR );
} }
public int getIndexForColumnName(String columnName, ResultSet rs) throws SQLException { public int getIndexForColumnName(String columnName, ResultSet rs) throws SQLException {
@ -53,4 +53,4 @@ public class ColumnNameCache {
return index; return index;
} }
} }
} }