Package org.apache.hadoop.util

Class LambdaUtils

java.lang.Object

org.apache.hadoop.util.LambdaUtils

@Private
@Unstable
public final class LambdaUtils
extends java.lang.Object

Lambda-expression utilities be they generic or specific to Hadoop datatypes.

Method Summary

Modifier and Type	Method	Description
static <T> java.util.concurrent.CompletableFuture<T>	eval(java.util.concurrent.CompletableFuture<T> result, java.util.concurrent.Callable<T> call)	Utility method to evaluate a callable and fill in the future with the result or the exception raised.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

eval

public static <T> java.util.concurrent.CompletableFuture<T> eval(java.util.concurrent.CompletableFuture<T> result,
                                                                 java.util.concurrent.Callable<T> call)

Utility method to evaluate a callable and fill in the future with the result or the exception raised. Once this method returns, the future will have been evaluated to either a return value or an exception.

Type Parameters:

T - type of future

Parameters:

result - future for the result.

call - callable to invoke.

Returns:

the future passed in