org.apache.hadoop.hdfs.util

Class RateLimiter

java.lang.Object

org.apache.hadoop.hdfs.util.RateLimiter

public class RateLimiter
extends Object

A rate limiter which loosely emulates the behavior of Guava's RateLimiter for branches which do not have that class available. The APIs are intended to match RateLimiter's to avoid code changes in calling classes when switching to Guava.

Method Summary

Methods

Modifier and Type	Method and Description
double	acquire() Attempt to acquire a permit to perform an operation.
static RateLimiter	create(double maxOpsPerSecond)

Methods inherited from class java.lang.Object

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

Method Detail

create

public static RateLimiter create(double maxOpsPerSecond)

acquire

public double acquire()

Attempt to acquire a permit to perform an operation. This will block until enough time has elapsed since the last operation to perform another. No fairness is provided; acquisition attempts will be serviced in an arbitrary order rather than FIFO.

Returns:

The time, in seconds, it took to acquire a permit.