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Allow constructing a PailSource from a PailSpec #1424

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Allow constructing a PailSource from a PailSpec #1424

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b684787
Add a PailSource ctor taking a PailSpec arg
Aug 14, 2015
6b43239
Merge remote-tracking branch 'upstream/develop' into develop
Aug 17, 2015
5eeb0bc
Merge remote-tracking branch 'upstream/develop' into develop
Aug 18, 2015
66f8f00
Use an empty array as default value for subpath
Aug 18, 2015
a246e83
Merge remote-tracking branch 'upstream/develop' into develop
Aug 24, 2015
2144b29
Make PailSource a TypeSink
Aug 24, 2015
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31 changes: 23 additions & 8 deletions scalding-commons/src/main/scala/com/twitter/scalding/commons/source/PailSource.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -19,7 +19,7 @@ package com.twitter.scalding.commons.source
import scala.reflect.ClassTag

import com.backtype.cascading.tap.PailTap
import com.backtype.hadoop.pail.PailStructure
import com.backtype.hadoop.pail.{ PailStructure, PailSpec }
import cascading.tap.Tap
import com.twitter.bijection.Injection
import com.twitter.scalding._
Expand Down Expand Up @@ -79,9 +79,16 @@ object PailSource {

/**
* Generic version of Pail sink accepts a PailStructure.
* Prefer the override taking a PailSpec as it gives you finer control over pail configuration (compression for ex)
*/
def sink[T](rootPath: String, structure: PailStructure[T]): PailSource[T] =
new PailSource(rootPath, structure)
sink(rootPath, PailTap.makeSpec(null, structure))

/**
* Generic version of Pail sink accepts a PailSpec.
*/
def sink[T](rootPath: String, spec: PailSpec): PailSource[T] =
new PailSource[T](rootPath, spec)

/**
* A Pail sink can also build its structure on the fly from a
Expand Down Expand Up @@ -113,10 +120,19 @@ object PailSource {

/**
* Generic version of Pail source accepts a PailStructure.
* Prefer the override taking a PailSpec as it gives you finer control over pail configuration (compression for ex)
*/
def source[T](rootPath: String, structure: PailStructure[T], subPaths: Array[List[String]]): PailSource[T] = {
assert(subPaths != null && subPaths.size > 0)
new PailSource(rootPath, structure, subPaths)
new PailSource[T](rootPath, PailTap.makeSpec(null, structure), subPaths)
}

/**
* Generic version of Pail source accepts a PailSpec.
*/
def source[T](rootPath: String, spec: PailSpec, subPaths: Array[List[String]]): PailSource[T] = {
assert(subPaths != null && subPaths.size > 0)
new PailSource[T](rootPath, spec, subPaths)
}

/**
Expand Down Expand Up @@ -145,16 +161,16 @@ object PailSource {
}
}

class PailSource[T] private (rootPath: String, structure: PailStructure[T], subPaths: Array[List[String]] = null)(implicit conv: TupleConverter[T])
extends Source with Mappable[T] {
class PailSource[T] private (rootPath: String, spec: PailSpec, subPaths: Array[List[String]] = Array.empty)(implicit conv: TupleConverter[T], tset: TupleSetter[T])
extends Source with Mappable[T] with TypedSink[T] {
import Dsl._

override def converter[U >: T] = TupleConverter.asSuperConverter[T, U](conv)
override def setter[U <: T]: TupleSetter[U] = TupleSetter.asSubSetter(tset)
val fieldName = "pailItem"

lazy val getTap = {
val spec = PailTap.makeSpec(null, structure)
val javaSubPath = if ((subPaths == null) || (subPaths.size == 0)) null else subPaths map { _.asJava }
val javaSubPath = subPaths map { _.asJava }
val opts = new PailTap.PailTapOptions(spec, fieldName, javaSubPath, null)
new PailTap(rootPath, opts)
}
Expand All @@ -172,7 +188,6 @@ class PailSource[T] private (rootPath: String, structure: PailStructure[T], subP
TestTapFactory(this, tap.getScheme).createTap(readOrWrite)(mode)
}
}

}

/**
Expand Down