org.apache.directory.server.xdbm.search
Interface Optimizer
- All Known Implementing Classes:
- DefaultOptimizer, NoOpOptimizer
public interface Optimizer
An optimizer applies heuristics to determine best execution path to a search
filter based on scan counts within database indices. It annotates the nodes
of an expression subtree by setting a "count" key in the node. Its goal is
to annotate nodes with counts to indicate which nodes to iterate over thereby
minimizing the number cycles in a search. The SearchEngine relies on these
count markers to determine the appropriate path.
- Version:
- $Rev: 656041 $
- Author:
- Apache Directory Project
Method Summary |
java.lang.Long |
annotate(org.apache.directory.shared.ldap.filter.ExprNode node)
Annotates the expression node tree for optimized traversal metrics. |
annotate
java.lang.Long annotate(org.apache.directory.shared.ldap.filter.ExprNode node)
throws java.lang.Exception
- Annotates the expression node tree for optimized traversal metrics.
- Parameters:
node
- the root of the expression node tree
- Throws:
java.lang.Exception
- if there are failures while optimizing
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