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optimize single alias lookup

This commit is contained in:
kimchy 2011-05-22 07:06:23 +03:00
parent 3d5d25b03b
commit 404a8f23de
1 changed files with 27 additions and 3 deletions
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30
modules/elasticsearch/src/main/java/org/elasticsearch/index/aliases/IndexAliasesService.java
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@ -19,7 +19,9 @@
package org.elasticsearch.index.aliases; package org.elasticsearch.index.aliases;
import org.apache.lucene.search.*; import org.apache.lucene.search.BooleanClause;
import org.apache.lucene.search.Filter;
import org.apache.lucene.search.FilterClause;
import org.elasticsearch.common.Nullable; import org.elasticsearch.common.Nullable;
import org.elasticsearch.common.collect.ImmutableMap; import org.elasticsearch.common.collect.ImmutableMap;
import org.elasticsearch.common.collect.UnmodifiableIterator; import org.elasticsearch.common.collect.UnmodifiableIterator;
@ -39,8 +41,8 @@ import org.elasticsearch.indices.AliasFilterParsingException;
import java.io.IOException; import java.io.IOException;
import java.util.List; import java.util.List;
import static org.elasticsearch.common.collect.Lists.newArrayList; import static org.elasticsearch.common.collect.Lists.*;
import static org.elasticsearch.common.collect.MapBuilder.newMapBuilder; import static org.elasticsearch.common.collect.MapBuilder.*;
/** /**
* @author imotov * @author imotov
@ -70,7 +72,29 @@ public class IndexAliasesService extends AbstractIndexComponent implements Itera
add(new IndexAlias(alias, filter, parse(alias, filter))); add(new IndexAlias(alias, filter, parse(alias, filter)));
} }
/**
* Returns the filter associated with a possibly aliased indices.
*
* <p>Returns <tt>null</tt> if no filtering is required. Note, if no alias if found for the provided value
* then no filtering is done.</p>
*/
public Filter aliasFilter(String... indices) { public Filter aliasFilter(String... indices) {
if (indices == null) {
return null;
}
// optimize for the most common single index/alias scenario
if (indices.length == 1) {
String alias = indices[0];
// The list contains the index itself - no filtering needed
if (alias.equals(index.name())) {
return null;
}
IndexAlias indexAlias = aliases.get(alias);
if (indexAlias == null) {
return null;
}
return indexAlias.parsedFilter();
}
List<Filter> filters = null; List<Filter> filters = null;
for (String alias : indices) { for (String alias : indices) {
// The list contains the index itself - no filtering needed // The list contains the index itself - no filtering needed