| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF 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.apache.solr.search.grouping.distributed.requestfactory; |
| |
| import org.apache.solr.common.params.CommonParams; |
| import org.apache.solr.common.params.GroupParams; |
| import org.apache.solr.common.params.ModifiableSolrParams; |
| import org.apache.solr.common.params.ShardParams; |
| import org.apache.solr.handler.component.ResponseBuilder; |
| import org.apache.solr.handler.component.ShardRequest; |
| import org.apache.solr.search.SolrIndexSearcher; |
| import org.apache.solr.search.grouping.GroupingSpecification; |
| import org.apache.solr.search.grouping.distributed.ShardRequestFactory; |
| |
| /** |
| * Concrete implementation of {@link ShardRequestFactory} that creates {@link ShardRequest} instances for getting the |
| * search groups from all shards. |
| */ |
| public class SearchGroupsRequestFactory implements ShardRequestFactory { |
| |
| @Override |
| public ShardRequest[] constructRequest(ResponseBuilder rb) { |
| ShardRequest sreq = new ShardRequest(); |
| GroupingSpecification groupingSpecification = rb.getGroupingSpec(); |
| if (groupingSpecification.getFields().length == 0) { |
| return new ShardRequest[0]; |
| } |
| |
| sreq.purpose = ShardRequest.PURPOSE_GET_TOP_GROUPS; |
| |
| sreq.params = new ModifiableSolrParams(rb.req.getParams()); |
| // TODO: base on current params or original params? |
| |
| // don't pass through any shards param |
| sreq.params.remove(ShardParams.SHARDS); |
| |
| // set the start (offset) to 0 for each shard request so we can properly merge |
| // results from the start. |
| if(rb.shards_start > -1) { |
| // if the client set shards.start set this explicitly |
| sreq.params.set(CommonParams.START,rb.shards_start); |
| } else { |
| sreq.params.set(CommonParams.START, "0"); |
| } |
| // TODO: should we even use the SortSpec? That's obtained from the QParser, and |
| // perhaps we shouldn't attempt to parse the query at this level? |
| // Alternate Idea: instead of specifying all these things at the upper level, |
| // we could just specify that this is a shard request. |
| if(rb.shards_rows > -1) { |
| // if the client set shards.rows set this explicity |
| sreq.params.set(CommonParams.ROWS,rb.shards_rows); |
| } else { |
| sreq.params.set(CommonParams.ROWS, rb.getSortSpec().getOffset() + rb.getSortSpec().getCount()); |
| } |
| |
| // in this first phase, request only the unique key field |
| // and any fields needed for merging. |
| sreq.params.set(GroupParams.GROUP_DISTRIBUTED_FIRST, "true"); |
| |
| if ( (rb.getFieldFlags() & SolrIndexSearcher.GET_SCORES)!=0 || rb.getSortSpec().includesScore()) { |
| sreq.params.set(CommonParams.FL, rb.req.getSchema().getUniqueKeyField().getName() + ",score"); |
| } else { |
| sreq.params.set(CommonParams.FL, rb.req.getSchema().getUniqueKeyField().getName()); |
| } |
| return new ShardRequest[] {sreq}; |
| } |
| |
| } |