| /* |
| * 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.hudi.common.table; |
| |
| import org.apache.hudi.common.model.TimelineLayoutVersion; |
| import org.apache.hudi.common.table.timeline.HoodieInstant; |
| import org.apache.hudi.common.util.collection.Pair; |
| |
| import java.io.Serializable; |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.stream.Collectors; |
| import java.util.stream.Stream; |
| |
| |
| /** |
| * Timeline Layout responsible for applying specific filters when generating timeline instants. |
| */ |
| public abstract class TimelineLayout implements Serializable { |
| |
| private static final Map<TimelineLayoutVersion, TimelineLayout> LAYOUT_MAP = new HashMap<>(); |
| |
| static { |
| LAYOUT_MAP.put(new TimelineLayoutVersion(TimelineLayoutVersion.VERSION_0), new TimelineLayoutV0()); |
| LAYOUT_MAP.put(new TimelineLayoutVersion(TimelineLayoutVersion.VERSION_1), new TimelineLayoutV1()); |
| } |
| |
| public static TimelineLayout getLayout(TimelineLayoutVersion version) { |
| return LAYOUT_MAP.get(version); |
| } |
| |
| public abstract Stream<HoodieInstant> filterHoodieInstants(Stream<HoodieInstant> instantStream); |
| |
| /** |
| * Table Layout where state transitions are managed by renaming files. |
| */ |
| private static class TimelineLayoutV0 extends TimelineLayout { |
| |
| @Override |
| public Stream<HoodieInstant> filterHoodieInstants(Stream<HoodieInstant> instantStream) { |
| return instantStream; |
| } |
| } |
| |
| /** |
| * Table Layout where state transitions are managed by creating new files. |
| */ |
| private static class TimelineLayoutV1 extends TimelineLayout { |
| |
| @Override |
| public Stream<HoodieInstant> filterHoodieInstants(Stream<HoodieInstant> instantStream) { |
| return instantStream.collect(Collectors.groupingBy(instant -> Pair.of(instant.getTimestamp(), |
| HoodieInstant.getComparableAction(instant.getAction())))).values().stream() |
| .map(hoodieInstants -> hoodieInstants.stream().reduce((x, y) -> { |
| // Pick the one with the highest state |
| if (x.getState().compareTo(y.getState()) >= 0) { |
| return x; |
| } |
| return y; |
| }).get()); |
| } |
| } |
| } |