org.apache.reef.tang

Interface ExternalConstructor<T>

Type Parameters:

T - The type this ExternalConstructor will create.

All Known Implementing Classes:

DefaultClientConstructor, ExecutorServiceConstructor, FSCheckPointServiceConfiguration.FileSystemConstructor, IdentifierParser, InputFormatExternalConstructor, InputSplitExternalConstructor, JobConfExternalConstructor, UnsafeClientConstructor, ValidateConfiguration.FileParser, YarnConfigurationConstructor

public interface ExternalConstructor<T>

This interface allows legacy classes to be injected by ConfigurationBuilderImpl. To be of any use, implementations of this class must have at least one constructor with an @Inject annotation. From ConfigurationBuilderImpl's perspective, an ExternalConstructor class is just a special instance of the class T, except that, after injection an ExternalConstructor, ConfigurationBuilderImpl will call newInstance, and store the resulting object. It will then discard the ExternalConstructor.

Author:

sears

Method Summary

Methods

Modifier and Type	Method and Description
T	newInstance() This method will only be called once.

Method Detail

newInstance

T newInstance()

This method will only be called once.

Returns:

a new, distinct instance of T.