/*
* 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.flink.streaming.connectors.kafka.internals;
/**
* Magic values used to represent special offset states before partitions are actually read.
*
* The values are all negative. Negative offsets are not used by Kafka (invalid), so we
* pick a number that is probably (hopefully) not used by Kafka as a magic number for anything else.
*/
public class KafkaTopicPartitionStateSentinel {
/** Magic number that defines an unset offset. */
public static final long OFFSET_NOT_SET = -915623761776L;
/**
* Magic number that defines the partition should start from the earliest offset.
*
* This is used as a placeholder so that the actual earliest offset can be evaluated lazily
* when the partition will actually start to be read by the consumer.
*/
public static final long EARLIEST_OFFSET = -915623761775L;
/**
* Magic number that defines the partition should start from the latest offset.
*
* This is used as a placeholder so that the actual latest offset can be evaluated lazily
* when the partition will actually start to be read by the consumer.
*/
public static final long LATEST_OFFSET = -915623761774L;
/**
* Magic number that defines the partition should start from its committed group offset in Kafka.
*
* This is used as a placeholder so that the actual committed group offset can be evaluated lazily
* when the partition will actually start to be read by the consumer.
*/
public static final long GROUP_OFFSET = -915623761773L;
}