RowCreatorProducer

RowCreatorProducer is used to create different kinds of RowCreator instances.

Classes that extend RowCreatorProducer should (try to) have only zero-argument constructors.

This is because RowCreator instances should ideally only be parametrized by the JSON specification. Otherwise, one JSON specification could produce non-equivalent RowCreator instances in different environments.

This statelessness is a design goal and should only be broken with good reason.

One of the reasons this rule will likely be broken is that things like context bounds on a type parameter to a RowCreatorProducer become constructor arguments. So if a RowCreatorProducer is parametrized by a type that requires a type class to decode the JSON representation, this rule would be broken.

Another example might be in training multi-label models. Whereas in binary classifiers the labels values are known automatically (because they are isomorphic to the set {true, false}), the label set isn't known a priori (because each problem codomain might be different). Therefore, we might ask for the set of labels to expect.

NOTE: com.eharmony.aloha.dataset.RowCreatorProducerTest will be used to control which RowCreatorProducers can accept parameters.

A: type of input passed to the RowCreator.
B: type of output returned from the RowCreator.
Impl: implementation of the RowCreator that is returned by the getRowCreator function.

Linear Supertypes

AnyRef, Any

Known Subclasses

Producer, Producer, Producer, Producer, Producer, Producer, Producer

Type Members

abstract type JsonType

Type of parsed JSON object.

Abstract Value Members

abstract def getRowCreator(semantics: CompiledSemantics[A], jsonSpec: JsonType): Try[Impl]

Attempt to produce a Spec.
Attempt to produce a Spec.
semantics
semantics used to make sense of the features in the JsonSpec
jsonSpec
a JSON specification to transform into a RowCreator.
returns
abstract def name: String

Name of this producer.
Name of this producer.
returns
abstract def parse(json: JsValue): Try[JsonType]

Attempt to parse the JSON AST to an intermediate representation that is used
Attempt to parse the JSON AST to an intermediate representation that is used
json
returns

Concrete Value Members

final def !=(arg0: AnyRef): Boolean

Definition Classes
AnyRef
final def !=(arg0: Any): Boolean

Definition Classes
Any
final def ##(): Int

Definition Classes
AnyRef → Any
final def ==(arg0: AnyRef): Boolean

Definition Classes
AnyRef
final def ==(arg0: Any): Boolean

Definition Classes
Any
final def asInstanceOf[T0]: T0

Definition Classes
Any
def clone(): AnyRef

Attributes
protected[java.lang]
Definition Classes
AnyRef
Annotations
@throws( ... )
final def eq(arg0: AnyRef): Boolean

Definition Classes
AnyRef
def equals(arg0: Any): Boolean

Definition Classes
AnyRef → Any
def finalize(): Unit

Attributes
protected[java.lang]
Definition Classes
AnyRef
Annotations
@throws( classOf[java.lang.Throwable] )
final def getClass(): Class[_]

Definition Classes
AnyRef → Any
def hashCode(): Int

Definition Classes
AnyRef → Any
final def isInstanceOf[T0]: Boolean

Definition Classes
Any
final def ne(arg0: AnyRef): Boolean

Definition Classes
AnyRef
final def notify(): Unit

Definition Classes
AnyRef
final def notifyAll(): Unit

Definition Classes
AnyRef
final def synchronized[T0](arg0: ⇒ T0): T0

Definition Classes
AnyRef
def toString(): String

Definition Classes
AnyRef → Any
final def wait(): Unit

Definition Classes
AnyRef
Annotations
@throws( ... )
final def wait(arg0: Long, arg1: Int): Unit

Definition Classes
AnyRef
Annotations
@throws( ... )
final def wait(arg0: Long): Unit

Definition Classes
AnyRef
Annotations
@throws( ... )

trait RowCreatorProducer[A, +B, +Impl <: RowCreator[A, B]] extends AnyRef

Type Members

abstract type JsonType

Abstract Value Members

abstract def getRowCreator(semantics: CompiledSemantics[A], jsonSpec: JsonType): Try[Impl]

abstract def name: String

abstract def parse(json: JsValue): Try[JsonType]

Concrete Value Members

final def !=(arg0: AnyRef): Boolean

final def !=(arg0: Any): Boolean

final def ##(): Int

final def ==(arg0: AnyRef): Boolean

final def ==(arg0: Any): Boolean

final def asInstanceOf[T0]: T0

def clone(): AnyRef

final def eq(arg0: AnyRef): Boolean

def equals(arg0: Any): Boolean

def finalize(): Unit

final def getClass(): Class[_]

def hashCode(): Int

final def isInstanceOf[T0]: Boolean

final def ne(arg0: AnyRef): Boolean

final def notify(): Unit

final def notifyAll(): Unit

final def synchronized[T0](arg0: ⇒ T0): T0

def toString(): String

final def wait(): Unit

final def wait(arg0: Long, arg1: Int): Unit

final def wait(arg0: Long): Unit

Inherited from AnyRef

Inherited from Any

Ungrouped