HHH-8939 Reduce contention on initialization of ColumnNameCache instances by loaders
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@ -2104,15 +2104,17 @@ public abstract class Loader {
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}
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private ColumnNameCache retreiveColumnNameToIndexCache(final ResultSet rs) throws SQLException {
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if ( columnNameCache == null ) {
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synchronized ( this ) {
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if ( columnNameCache == null ) {
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LOG.trace( "Building columnName -> columnIndex cache" );
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columnNameCache = new ColumnNameCache( rs.getMetaData().getColumnCount() );
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}
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}
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final ColumnNameCache cache = columnNameCache;
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if ( cache == null ) {
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//there is no need for a synchronized second check, as in worst case
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//we'll have allocated an unnecessary ColumnNameCache
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LOG.trace( "Building columnName -> columnIndex cache" );
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columnNameCache = new ColumnNameCache( rs.getMetaData().getColumnCount() );
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return columnNameCache;
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}
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else {
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return cache;
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}
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return columnNameCache;
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}
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/**
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