| /* |
| * 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.common.cloud; |
| |
| import java.util.Collection; |
| import java.util.Collections; |
| |
| import org.apache.solr.common.SolrException; |
| import org.apache.solr.common.SolrInputDocument; |
| import org.apache.solr.common.params.SolrParams; |
| import org.apache.solr.common.util.Hash; |
| |
| import static org.apache.solr.common.params.CommonParams.ID; |
| |
| public abstract class HashBasedRouter extends DocRouter { |
| |
| @Override |
| public Slice getTargetSlice(String id, SolrInputDocument sdoc, String route, SolrParams params, DocCollection collection) { |
| int hash; |
| if (route != null) { |
| hash = sliceHash(route, sdoc, params, collection); |
| } else { |
| if (id == null) id = getId(sdoc, params); |
| hash = sliceHash(id, sdoc, params, collection); |
| } |
| return hashToSlice(hash, collection); |
| } |
| |
| @Override |
| public boolean isTargetSlice(String id, SolrInputDocument sdoc, SolrParams params, String shardId, DocCollection collection) { |
| if (id == null) id = getId(sdoc, params); |
| int hash = sliceHash(id, sdoc, params, collection); |
| Range range = collection.getSlice(shardId).getRange(); |
| return range != null && range.includes(hash); |
| } |
| |
| public int sliceHash(String id, SolrInputDocument sdoc, SolrParams params, DocCollection collection) { |
| return Hash.murmurhash3_x86_32(id, 0, id.length(), 0); |
| } |
| |
| protected String getId(SolrInputDocument sdoc, SolrParams params) { |
| Object idObj = sdoc.getFieldValue(ID); // blech |
| String id = idObj != null ? idObj.toString() : "null"; // should only happen on client side |
| return id; |
| } |
| |
| protected Slice hashToSlice(int hash, DocCollection collection) { |
| final Slice[] slices = collection.getActiveSlicesArr(); |
| for (Slice slice : slices) { |
| Range range = slice.getRange(); |
| if (range != null && range.includes(hash)) return slice; |
| } |
| throw new SolrException(SolrException.ErrorCode.BAD_REQUEST, "No active slice servicing hash code " + Integer.toHexString(hash) + " in " + collection.getName()); |
| } |
| |
| |
| @Override |
| public Collection<Slice> getSearchSlicesSingle(String shardKey, SolrParams params, DocCollection collection) { |
| if (shardKey == null) { |
| // search across whole collection |
| // TODO: this may need modification in the future when shard splitting could cause an overlap |
| return collection.getActiveSlices(); |
| } |
| |
| // use the shardKey as an id for plain hashing |
| Slice slice = getTargetSlice(shardKey, null, null, params, collection); |
| return slice == null ? Collections.<Slice>emptyList() : Collections.singletonList(slice); |
| } |
| } |