com.google.cloud.dataflow.sdk.options

Interface ValueProvider<T>

All Superinterfaces:

Serializable

All Known Implementing Classes:

ValueProvider.NestedValueProvider, ValueProvider.RuntimeValueProvider, ValueProvider.StaticValueProvider

public interface ValueProvider<T>
extends Serializable

ValueProvider is an interface which abstracts the notion of fetching a value that may or may not be currently available. This can be used to parameterize transforms that only read values in at runtime, for example.

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static class	ValueProvider.Deserializer Deserializer for ValueProvider, which handles type marshalling.
static class	ValueProvider.NestedValueProvider<T,X> ValueProvider.NestedValueProvider is an implementation of ValueProvider that allows for wrapping another ValueProvider object.
static class	ValueProvider.RuntimeValueProvider<T> ValueProvider.RuntimeValueProvider is an implementation of ValueProvider that allows for a value to be provided at execution time rather than at graph construction time.
static class	ValueProvider.Serializer Serializer for ValueProvider.
static class	ValueProvider.StaticValueProvider<T> ValueProvider.StaticValueProvider is an implementation of ValueProvider that allows for a static value to be provided.

Method Summary

Modifier and Type	Method and Description
T	get() Return the value wrapped by this ValueProvider.
boolean	isAccessible() Whether the contents of this ValueProvider is available to routines that run at graph construction time.

Method Detail

get

T get()

Return the value wrapped by this ValueProvider.

isAccessible

boolean isAccessible()

Whether the contents of this ValueProvider is available to routines that run at graph construction time.