org.feijoas.mango.common.hash

Funnel

Related Docs: object Funnel | package hash

trait Funnel[T] extends Serializable

A Funnel is a type class for an object which can send data from an object of type T into a PrimitiveSink.

Note that serialization of a BloomFilter requires the proper serialization of funnels.

From the Guava Funnel tutorial:

// A Funnel describes how to decompose a particular object type into primitive field values.
// For example, if we had
case class Person(id: Integer, firstName: String, lastName: String, birthYear: Int)

// our Funnel might look like
implicit val personFunnel = new Funnel[Person] {
   override def funnel(person: Person, into: PrimitiveSink) = {
      into
      .putInt(person.id)
      .putString(person.firstName, Charsets.UTF_8)
      .putString(person.lastName, Charsets.UTF_8)
      .putInt(person.birthYear)
   }
}
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Since

0.6 (copied from Guava-libraries)

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  1. abstract def funnel(from: T, into: PrimitiveSink): Unit

    Sends a stream of data from the from object into the sink into.

    Sends a stream of data from the from object into the sink into. There is no requirement that this data be complete enough to fully reconstitute the object later.

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  1. final def !=(arg0: Any): Boolean

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