| /* |
| * 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.core; |
| |
| import static org.apache.solr.common.params.CommonParams.QUERY_UUID; |
| |
| import java.util.Iterator; |
| import java.util.Map; |
| import java.util.UUID; |
| import java.util.concurrent.ConcurrentHashMap; |
| import org.apache.solr.request.SolrQueryRequest; |
| import org.apache.solr.search.CancellableCollector; |
| |
| /** Tracks metadata for active queries and provides methods for access */ |
| public class CancellableQueryTracker { |
| // TODO: This needs to become a time aware storage model |
| private final Map<String, CancellableCollector> activeCancellableQueries = |
| new ConcurrentHashMap<>(); |
| private final Map<String, String> activeQueriesGenerated = new ConcurrentHashMap<>(); |
| |
| /** |
| * Generates a UUID for the given query or if the user provided a UUID for this query, uses that. |
| */ |
| public String generateQueryID(SolrQueryRequest req) { |
| String queryID; |
| String customQueryUUID = req.getParams().get(QUERY_UUID, null); |
| |
| if (customQueryUUID != null) { |
| queryID = customQueryUUID; |
| } else { |
| // TODO: Use a different generator |
| queryID = UUID.randomUUID().toString(); |
| } |
| |
| if (activeQueriesGenerated.containsKey(queryID)) { |
| if (customQueryUUID != null) { |
| throw new IllegalArgumentException("Duplicate query UUID given"); |
| } else { |
| while (activeQueriesGenerated.get(queryID) != null) { |
| queryID = UUID.randomUUID().toString(); |
| } |
| } |
| } |
| |
| activeQueriesGenerated.put(queryID, req.getHttpSolrCall().getReq().getQueryString()); |
| |
| return queryID; |
| } |
| |
| public void releaseQueryID(String inputQueryID) { |
| if (inputQueryID == null) { |
| return; |
| } |
| |
| activeQueriesGenerated.remove(inputQueryID); |
| } |
| |
| public boolean isQueryIdActive(String queryID) { |
| return activeQueriesGenerated.containsKey(queryID); |
| } |
| |
| public void addShardLevelActiveQuery(String queryID, CancellableCollector collector) { |
| if (queryID == null) { |
| return; |
| } |
| |
| activeCancellableQueries.put(queryID, collector); |
| } |
| |
| public CancellableCollector getCancellableTask(String queryID) { |
| if (queryID == null) { |
| throw new IllegalArgumentException("Input queryID is null"); |
| } |
| |
| return activeCancellableQueries.get(queryID); |
| } |
| |
| public void removeCancellableQuery(String queryID) { |
| if (queryID == null) { |
| // Some components, such as CaffeineCache, use the searcher to fire internal queries which are |
| // not tracked |
| return; |
| } |
| |
| activeCancellableQueries.remove(queryID); |
| } |
| |
| public Iterator<Map.Entry<String, String>> getActiveQueriesGenerated() { |
| return activeQueriesGenerated.entrySet().iterator(); |
| } |
| } |