| /* |
| * 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.drill.exec.resourcemgr.config.selectors; |
| |
| import org.apache.drill.exec.ExecConstants; |
| import org.apache.drill.exec.ops.QueryContext; |
| import org.apache.drill.exec.resourcemgr.config.exception.RMConfigException; |
| |
| /** |
| * Simple selector whose value is a string representing a tag. It tries to match it's configured tag with one of |
| * the tags configured for the query using connection/session parameter. If a query posses at least one tag same as |
| * this selector tag then it will be admitted in the respective ResourcePool. |
| * |
| * Example configuration is of form: |
| * <code><pre> |
| * selector: { |
| * tag: "BITool" |
| * } |
| * </pre></code> |
| */ |
| public class TagSelector extends AbstractResourcePoolSelector { |
| private static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(TagSelector.class); |
| |
| private final String configuredTag; |
| |
| TagSelector(String selectorValue) throws RMConfigException { |
| super(SelectorType.TAG); |
| |
| if (selectorValue == null || selectorValue.isEmpty()) { |
| throw new RMConfigException("Tag value of this selector is either null or empty. Please configure a valid tag " + |
| "as string."); |
| } |
| configuredTag = selectorValue; |
| } |
| |
| @Override |
| public SelectorType getSelectorType() { |
| return SELECTOR_TYPE; |
| } |
| |
| @Override |
| public boolean isQuerySelected(QueryContext queryContext) { |
| String[] queryTags = queryContext.getOption(ExecConstants.RM_QUERY_TAGS_KEY).string_val.split(","); |
| for (String queryTag : queryTags) { |
| if (queryTag.equals(configuredTag)) { |
| logger.debug("Query {} tag {} matches the selector tag {}", queryContext.getQueryId(), queryTag, configuredTag); |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| public String getTagValue() { |
| return configuredTag; |
| } |
| |
| @Override |
| public String toString() { |
| return "{ SelectorType: " + super.toString() + ", TagValue: [" + configuredTag + "]}"; |
| } |
| } |