io.cdap.cdap.api

Interface TxCallable<V>

Type Parameters:

V - type of the return value from the call(DatasetContext).

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface TxCallable<V>

A callable that provides a DatasetContext to programs which may be used to get access to and use datasets.

Method Summary

Modifier and Type	Method and Description
V	call(DatasetContext context) Provides a DatasetContext to get instances of Datasets.

Method Detail

call

V call(DatasetContext context)
throws Exception

Provides a DatasetContext to get instances of Datasets.

Operations executed on a dataset within the execution of this method are committed as a single transaction. The transaction is started before this method is invoked and is committed upon successful execution. Exceptions thrown while committing the transaction or thrown by user-code result in a rollback of the transaction.

Parameters:

context - to get datasets from

Returns:

return value of the call method

Throws:

Exception