Packages

•  package root

  Definition Classes

  root

•  package org

  Definition Classes

  root

•  package apache

  Definition Classes

  org

•  package spark

  Definition Classes

  apache

•  package util

  Definition Classes

  spark

•  trait LexicalThreadLocal[T] extends AnyRef

  Helper trait for defining thread locals with lexical scoping.

  Helper trait for defining thread locals with lexical scoping. With this helper, the thread local is private and can only be set by the Handle. The Handle only exposes the thread local value to functions passed into its runWith method. This pattern allows for the lifetime of the thread local value to be strictly controlled.

  Rather than calling tl.set(...) and tl.remove() you would get a handle and execute your code in handle.runWith { ... }.

  Example:

  object Credentials extends LexicalThreadLocal[Int] {
    def create(creds: Map[String, String]) = new Handle(Some(creds))
  }
  ...
  val handle = Credentials.create(Map("key" -> "value"))
  assert(Credentials.get() == None)
  handle.runWith {
    assert(Credentials.get() == Some(Map("key" -> "value")))
  }

  Definition Classes

  util

• Handle

org.apache.spark.util.LexicalThreadLocal

Handle