| /* |
| * Copyright (c) 2013 DataTorrent, Inc. ALL Rights Reserved. |
| * |
| * Licensed 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 com.datatorrent.contrib.kafka; |
| |
| import java.util.Map; |
| |
| /** |
| * An offset manager interface used by {@link AbstractPartitionableKafkaInputOperator} to define the customized initial offsets and periodically update the current offsets of all the operators |
| * <br> |
| * <br> |
| * Ex. you could write offset to hdfs and load it back when restart the application |
| * |
| * @since 2.0.0 |
| */ |
| public interface OffsetManager |
| { |
| |
| |
| /** |
| * |
| * Load initial offsets for all kafka partition |
| * <br> |
| * The method is called at the first attempt of creating partitions and the return value is used as initial offset for simple consumer |
| * |
| * @return Map of Kafka partition id as key and offset as value |
| */ |
| public Map<Integer, Long> loadInitialOffsets(); |
| |
| |
| /** |
| * @param offsetsOfPartitions offsets for specified partitions, it is reported by individual operator instances |
| * <br> |
| * The method is called every {@link AbstractPartitionableKafkaInputOperator#getRepartitionCheckInterval()} to update the current offset |
| */ |
| public void updateOffsets(Map<Integer, Long> offsetsOfPartitions); |
| |
| } |