kafka IndexEntry 源码
kafka IndexEntry 代码
文件路径：/core/src/main/scala/kafka/log/IndexEntry.scala
/**
* 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 kafka.log
import org.apache.kafka.common.requests.ListOffsetsResponse
sealed trait IndexEntry {
// We always use Long for both key and value to avoid boxing.
def indexKey: Long
def indexValue: Long
}
/**
* The mapping between a logical log offset and the physical position
* in some log file of the beginning of the message set entry with the
* given offset.
*/
case class OffsetPosition(offset: Long, position: Int) extends IndexEntry {
override def indexKey = offset
override def indexValue = position.toLong
}
/**
* The mapping between a timestamp to a message offset. The entry means that any message whose timestamp is greater
* than that timestamp must be at or after that offset.
* @param timestamp The max timestamp before the given offset.
* @param offset The message offset.
*/
case class TimestampOffset(timestamp: Long, offset: Long) extends IndexEntry {
override def indexKey = timestamp
override def indexValue = offset
}
object TimestampOffset {
val Unknown = TimestampOffset(ListOffsetsResponse.UNKNOWN_TIMESTAMP, ListOffsetsResponse.UNKNOWN_OFFSET)
}
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