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* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch licenses this file to you under
* the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.elasticsearch.percolator;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.index.IndexOptions;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.IndexableField;
import org.apache.lucene.index.memory.MemoryIndex;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.util.CloseableThreadLocal;
import org.elasticsearch.ElasticsearchException;
import org.elasticsearch.index.engine.Engine;
import org.elasticsearch.index.mapper.ParsedDocument;
import org.elasticsearch.index.mapper.internal.UidFieldMapper;
import java.io.IOException;
/**
* Implementation of {@link PercolatorIndex} that can only hold a single Lucene document
* and is optimized for that
*/
class SingleDocumentPercolatorIndex implements PercolatorIndex {
private final CloseableThreadLocal<MemoryIndex> cache;
SingleDocumentPercolatorIndex(CloseableThreadLocal<MemoryIndex> cache) {
this.cache = cache;
}
@Override
public void prepare(PercolateContext context, ParsedDocument parsedDocument) {
MemoryIndex memoryIndex = cache.get();
for (IndexableField field : parsedDocument.rootDoc().getFields()) {
if (field.fieldType().indexOptions() == IndexOptions.NONE && field.name().equals(UidFieldMapper.NAME)) {
continue;
}
try {
// TODO: instead of passing null here, we can have a CTL<Map<String,TokenStream>> and pass previous,
// like the indexer does
TokenStream tokenStream = field.tokenStream(parsedDocument.analyzer(), null);
if (tokenStream != null) {
memoryIndex.addField(field.name(), tokenStream, field.boost());
}
} catch (IOException e) {
throw new ElasticsearchException("Failed to create token stream", e);
}
}
context.initialize(new DocEngineSearcher(memoryIndex), parsedDocument);
}
private class DocEngineSearcher implements Engine.Searcher {
private final IndexSearcher searcher;
private final MemoryIndex memoryIndex;
public DocEngineSearcher(MemoryIndex memoryIndex) {
this.searcher = memoryIndex.createSearcher();
this.memoryIndex = memoryIndex;
}
@Override
public String source() {
return "percolate";
}
@Override
public IndexReader reader() {
return searcher.getIndexReader();
}
@Override
public IndexSearcher searcher() {
return searcher;
}
@Override
public void close() throws ElasticsearchException {
try {
searcher.getIndexReader().close();
memoryIndex.reset();
} catch (IOException e) {
throw new ElasticsearchException("failed to close percolator in-memory index", e);
}
}
}
}