| /** |
| * 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.hadoop.hbase.hbtop.mode; |
| |
| import java.util.List; |
| import java.util.stream.Collectors; |
| import java.util.stream.Stream; |
| |
| import org.apache.hadoop.hbase.hbtop.Record; |
| import org.apache.hadoop.hbase.hbtop.RecordFilter; |
| import org.apache.hadoop.hbase.hbtop.field.Field; |
| |
| public final class ModeStrategyUtils { |
| private ModeStrategyUtils() { |
| |
| } |
| |
| /** |
| * Filter records as per the supplied filters, |
| * @param records records to be processed |
| * @param filters List of filters |
| * @return filtered records |
| */ |
| public static List<Record> applyFilterAndGet(List<Record> records, |
| List<RecordFilter> filters) { |
| if (filters != null && !filters.isEmpty()) { |
| return records.stream().filter(r -> filters.stream().allMatch(f -> f.execute(r))) |
| .collect(Collectors.toList()); |
| } |
| return records; |
| } |
| |
| |
| /** |
| * Group by records on the basis of supplied groupBy field and |
| * Aggregate records using {@link Record#combine(Record)} |
| * |
| * @param records records needs to be processed |
| * @param groupBy Field to be used for group by |
| * @return aggregated records |
| */ |
| public static List<Record> aggregateRecords(List<Record> records, Field groupBy) { |
| return records.stream().collect(Collectors.groupingBy(r -> r.get(groupBy))).entrySet().stream() |
| .flatMap(e -> e.getValue().stream().reduce(Record::combine).map(Stream::of) |
| .orElse(Stream.empty())).collect(Collectors.toList()); |
| } |
| |
| } |