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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
import org.apache.hadoop.fs.{FileStatus, Path}
import org.apache.spark.internal.Logging
import org.apache.spark.sql.SQLContext
import org.apache.spark.sql.catalyst.InternalRow
import org.apache.spark.sql.catalyst.expressions.Expression
import org.apache.spark.sql.execution.datasources.{FileCatalog, Partition, PartitionSpec}
import org.apache.spark.sql.types.StructType
class StreamFileCatalog(sqlContext: SQLContext, path: Path) extends FileCatalog with Logging {
val metadataDirectory = new Path(path, FileStreamSink.metadataDir)
logInfo(s"Reading streaming file log from $metadataDirectory")
val metadataLog = new FileStreamSinkLog(sqlContext, metadataDirectory.toUri.toString)
val fs = path.getFileSystem(sqlContext.sessionState.hadoopConf)
override def paths: Seq[Path] = path :: Nil
override def partitionSpec(): PartitionSpec = PartitionSpec(StructType(Nil), Nil)
/**
* Returns all valid files grouped into partitions when the data is partitioned. If the data is
* unpartitioned, this will return a single partition with not partition values.
*
* @param filters the filters used to prune which partitions are returned. These filters must
* only refer to partition columns and this method will only return files
* where these predicates are guaranteed to evaluate to `true`. Thus, these
* filters will not need to be evaluated again on the returned data.
*/
override def listFiles(filters: Seq[Expression]): Seq[Partition] =
Partition(InternalRow.empty, allFiles()) :: Nil
override def getStatus(path: Path): Array[FileStatus] = fs.listStatus(path)
override def refresh(): Unit = {}
override def allFiles(): Seq[FileStatus] = {
metadataLog.allFiles().map(_.toFileStatus)
}
}
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