| /* |
| * 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.rocketmq.flink.common.watermark; |
| |
| import org.apache.flink.streaming.api.functions.AssignerWithPeriodicWatermarks; |
| import org.apache.flink.streaming.api.watermark.Watermark; |
| import org.apache.rocketmq.common.message.MessageExt; |
| |
| public class BoundedOutOfOrdernessGenerator implements AssignerWithPeriodicWatermarks<MessageExt> { |
| |
| private long maxOutOfOrderness = 5000; // 5 seconds |
| |
| private long currentMaxTimestamp; |
| |
| public BoundedOutOfOrdernessGenerator() { |
| } |
| |
| public BoundedOutOfOrdernessGenerator(long maxOutOfOrderness) { |
| this.maxOutOfOrderness = maxOutOfOrderness; |
| } |
| |
| @Override |
| public long extractTimestamp(MessageExt element, long previousElementTimestamp) { |
| long timestamp = element.getBornTimestamp(); |
| currentMaxTimestamp = Math.max(timestamp, currentMaxTimestamp); |
| return timestamp; |
| } |
| |
| @Override |
| public Watermark getCurrentWatermark() { |
| // return the watermark as current highest timestamp minus the out-of-orderness bound |
| return new Watermark(currentMaxTimestamp - maxOutOfOrderness); |
| } |
| |
| @Override |
| public String toString() { |
| return "BoundedOutOfOrdernessGenerator{" + |
| "maxOutOfOrderness=" + maxOutOfOrderness + |
| ", currentMaxTimestamp=" + currentMaxTimestamp + |
| '}'; |
| } |
| } |