org.apache.reef.tang

Interface ExternalConstructor<T>

Type Parameters:

T - The type this ExternalConstructor will create.

All Known Implementing Classes:

DefaultClientConstructor, ExecutorServiceConstructor, FSCheckPointServiceConfiguration.FileSystemConstructor, HDFSConfigurationConstructor, 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.

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.