Many resources are needed to download a project. Please understand that we have to compensate our server costs. Thank you in advance. Project price only 1 $
You can buy this project and download/modify it how often you want.
/*
* Licensed to ElasticSearch and Shay Banon 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.action.explain;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.Explanation;
import org.elasticsearch.ElasticSearchException;
import org.elasticsearch.action.support.single.shard.TransportShardSingleOperationAction;
import org.elasticsearch.cluster.ClusterService;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.block.ClusterBlockException;
import org.elasticsearch.cluster.block.ClusterBlockLevel;
import org.elasticsearch.cluster.routing.ShardIterator;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.xcontent.XContentFactory;
import org.elasticsearch.common.xcontent.XContentHelper;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.index.engine.Engine;
import org.elasticsearch.index.get.GetResult;
import org.elasticsearch.index.mapper.Uid;
import org.elasticsearch.index.mapper.internal.UidFieldMapper;
import org.elasticsearch.index.query.ParsedQuery;
import org.elasticsearch.index.service.IndexService;
import org.elasticsearch.index.shard.service.IndexShard;
import org.elasticsearch.indices.IndicesService;
import org.elasticsearch.script.ScriptService;
import org.elasticsearch.search.internal.SearchContext;
import org.elasticsearch.search.internal.ShardSearchRequest;
import org.elasticsearch.search.rescore.RescoreSearchContext;
import org.elasticsearch.search.rescore.Rescorer;
import org.elasticsearch.threadpool.ThreadPool;
import org.elasticsearch.transport.TransportService;
import java.io.IOException;
/**
* Explain transport action. Computes the explain on the targeted shard.
*/
// TODO: AggregatedDfs. Currently the idf can be different then when executing a normal search with explain.
public class TransportExplainAction extends TransportShardSingleOperationAction {
private final IndicesService indicesService;
private final ScriptService scriptService;
@Inject
public TransportExplainAction(Settings settings, ThreadPool threadPool, ClusterService clusterService,
TransportService transportService, IndicesService indicesService,
ScriptService scriptService) {
super(settings, threadPool, clusterService, transportService);
this.indicesService = indicesService;
this.scriptService = scriptService;
}
protected String transportAction() {
return ExplainAction.NAME;
}
protected String executor() {
return ThreadPool.Names.GET; // Or use Names.SEARCH?
}
@Override
protected void resolveRequest(ClusterState state, ExplainRequest request) {
String concreteIndex = state.metaData().concreteIndex(request.index());
request.filteringAlias(state.metaData().filteringAliases(concreteIndex, request.index()));
request.index(state.metaData().concreteIndex(request.index()));
}
protected ExplainResponse shardOperation(ExplainRequest request, int shardId) throws ElasticSearchException {
IndexService indexService = indicesService.indexService(request.index());
IndexShard indexShard = indexService.shardSafe(shardId);
Term uidTerm = new Term(UidFieldMapper.NAME, Uid.createUidAsBytes(request.type(), request.id()));
Engine.GetResult result = indexShard.get(new Engine.Get(false, uidTerm));
if (!result.exists()) {
return new ExplainResponse(false);
}
SearchContext context = new SearchContext(
0,
new ShardSearchRequest().types(new String[]{request.type()})
.filteringAliases(request.filteringAlias()),
null, result.searcher(), indexService, indexShard,
scriptService
);
SearchContext.setCurrent(context);
try {
context.parsedQuery(parseQuery(request, indexService));
context.preProcess();
int topLevelDocId = result.docIdAndVersion().docId + result.docIdAndVersion().reader.docBase;
Explanation explanation;
if (context.rescore() != null) {
RescoreSearchContext ctx = context.rescore();
Rescorer rescorer = ctx.rescorer();
explanation = rescorer.explain(topLevelDocId, context, ctx);
} else {
explanation = context.searcher().explain(context.query(), topLevelDocId);
}
if (request.fields() != null) {
if (request.fields().length == 1 && "_source".equals(request.fields()[0])) {
request.fields(null); // Load the _source field
}
// Advantage is that we're not opening a second searcher to retrieve the _source. Also
// because we are working in the same searcher in engineGetResult we can be sure that a
// doc isn't deleted between the initial get and this call.
GetResult getResult = indexShard.getService().get(result, request.id(), request.type(), request.fields());
return new ExplainResponse(true, explanation, getResult);
} else {
return new ExplainResponse(true, explanation);
}
} catch (IOException e) {
throw new ElasticSearchException("Could not explain", e);
} finally {
context.release();
SearchContext.removeCurrent();
}
}
private ParsedQuery parseQuery(ExplainRequest request, IndexService indexService) {
try {
XContentParser parser = XContentHelper.createParser(request.source());
for (XContentParser.Token token = parser.nextToken(); token != XContentParser.Token.END_OBJECT; token = parser.nextToken()) {
if (token == XContentParser.Token.FIELD_NAME) {
String fieldName = parser.currentName();
if ("query".equals(fieldName)) {
return indexService.queryParserService().parse(parser);
} else if ("query_binary".equals(fieldName)) {
byte[] querySource = parser.binaryValue();
XContentParser qSourceParser = XContentFactory.xContent(querySource).createParser(querySource);
return indexService.queryParserService().parse(qSourceParser);
}
}
}
} catch (Exception e) {
throw new ElasticSearchException("Couldn't parse query from source.", e);
}
throw new ElasticSearchException("No query specified");
}
protected ExplainRequest newRequest() {
return new ExplainRequest();
}
protected ExplainResponse newResponse() {
return new ExplainResponse();
}
protected ClusterBlockException checkGlobalBlock(ClusterState state, ExplainRequest request) {
return state.blocks().globalBlockedException(ClusterBlockLevel.READ);
}
protected ClusterBlockException checkRequestBlock(ClusterState state, ExplainRequest request) {
return state.blocks().indexBlockedException(ClusterBlockLevel.READ, request.index());
}
protected ShardIterator shards(ClusterState state, ExplainRequest request) throws ElasticSearchException {
return clusterService.operationRouting().getShards(
clusterService.state(), request.index(), request.type(), request.id(), request.routing(), request.preference()
);
}
}
