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/*
* 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.spark.sql.execution.streaming
/**
* An ordered collection of offsets, used to track the progress of processing data from one or more
* [[Source]]s that are present in a streaming query. This is similar to simplified, single-instance
* vector clock that must progress linearly forward.
*/
case class CompositeOffset(offsets: Seq[Option[Offset]]) extends Offset {
/**
* Unpacks an offset into [[StreamProgress]] by associating each offset with the order list of
* sources.
*
* This method is typically used to associate a serialized offset with actual sources (which
* cannot be serialized).
*/
def toStreamProgress(sources: Seq[Source]): StreamProgress = {
assert(sources.size == offsets.size)
new StreamProgress ++ sources.zip(offsets).collect { case (s, Some(o)) => (s, o) }
}
override def toString: String =
offsets.map(_.map(_.toString).getOrElse("-")).mkString("[", ", ", "]")
}
object CompositeOffset {
/**
* Returns a [[CompositeOffset]] with a variable sequence of offsets.
* `nulls` in the sequence are converted to `None`s.
*/
def fill(offsets: Offset*): CompositeOffset = {
CompositeOffset(offsets.map(Option(_)))
}
}
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