| /* |
| * 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.druid.server.router; |
| |
| import com.fasterxml.jackson.annotation.JsonCreator; |
| import com.fasterxml.jackson.annotation.JsonProperty; |
| import com.google.common.annotations.VisibleForTesting; |
| import com.google.common.base.Optional; |
| import org.apache.commons.lang.StringUtils; |
| import org.apache.druid.java.util.common.logger.Logger; |
| import org.apache.druid.query.Query; |
| import org.apache.druid.query.QueryContexts; |
| import org.apache.druid.sql.http.SqlQuery; |
| |
| import javax.annotation.Nullable; |
| import java.util.Map; |
| |
| /** |
| * Implementation of {@link TieredBrokerSelectorStrategy} which uses the parameter |
| * {@link QueryContexts#BROKER_SERVICE_NAME} in the Query context to select the |
| * Broker Service. |
| * <p> |
| * If the {@link #defaultManualBrokerService} is set to a valid Broker Service Name, |
| * then all queries that do not specify a valid value for |
| * {@link QueryContexts#BROKER_SERVICE_NAME} would be directed to the |
| * {@code #defaultManualBrokerService}. Note that the {@code defaultManualBrokerService} |
| * can be different from the {@link TieredBrokerConfig#getDefaultBrokerServiceName()}. |
| */ |
| public class ManualTieredBrokerSelectorStrategy implements TieredBrokerSelectorStrategy |
| { |
| private static final Logger log = new Logger(ManualTieredBrokerSelectorStrategy.class); |
| |
| private final String defaultManualBrokerService; |
| |
| @JsonCreator |
| public ManualTieredBrokerSelectorStrategy( |
| @JsonProperty("defaultManualBrokerService") @Nullable String defaultManualBrokerService |
| ) |
| { |
| this.defaultManualBrokerService = defaultManualBrokerService; |
| } |
| |
| @Override |
| public Optional<String> getBrokerServiceName(TieredBrokerConfig tierConfig, Query query) |
| { |
| return getBrokerServiceName(tierConfig, query.getContext()); |
| } |
| |
| @Override |
| public Optional<String> getBrokerServiceName(TieredBrokerConfig config, SqlQuery sqlQuery) |
| { |
| return getBrokerServiceName(config, sqlQuery.getContext()); |
| } |
| |
| /** |
| * Determines the Broker service name from the given query context. |
| */ |
| private Optional<String> getBrokerServiceName( |
| TieredBrokerConfig tierConfig, |
| Map<String, Object> queryContext |
| ) |
| { |
| try { |
| final String contextBrokerService = QueryContexts.getBrokerServiceName(queryContext); |
| |
| if (isValidBrokerService(contextBrokerService, tierConfig)) { |
| // If the broker service in the query context is valid, use that |
| return Optional.of(contextBrokerService); |
| } else if (isValidBrokerService(defaultManualBrokerService, tierConfig)) { |
| // If the fallbackBrokerService is valid, use that |
| return Optional.of(defaultManualBrokerService); |
| } else { |
| log.warn( |
| "Could not find Broker Service [%s] or default [%s] in TieredBrokerConfig", |
| contextBrokerService, |
| defaultManualBrokerService |
| ); |
| return Optional.absent(); |
| } |
| } |
| catch (Exception e) { |
| log.error(e, "Error getting Broker Service name from Query Context"); |
| return isValidBrokerService(defaultManualBrokerService, tierConfig) |
| ? Optional.of(defaultManualBrokerService) : Optional.absent(); |
| } |
| } |
| |
| private boolean isValidBrokerService(String brokerServiceName, TieredBrokerConfig tierConfig) |
| { |
| return !StringUtils.isEmpty(brokerServiceName) |
| && tierConfig.getTierToBrokerMap().containsValue(brokerServiceName); |
| } |
| |
| @VisibleForTesting |
| String getDefaultManualBrokerService() |
| { |
| return defaultManualBrokerService; |
| } |
| } |