TokenBucket

java.lang.Object
- akka.util.TokenBucket

Direct Known Subclasses:

NanoTimeTokenBucket
```
public abstract class TokenBucket
extends java.lang.Object
```
This method must be called before the token bucket can be used.

Constructor Summary

Constructors
Constructor Description

TokenBucket(long capacity, long nanosBetweenTokens)

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`abstract long`	`currentTime()`	The current time in nanos.
`void`	`init()`	This method must be called before the token bucket can be used.
`long`	`offer(long cost)`	Call this (side-effecting) method whenever an element should be passed through the token-bucket.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - TokenBucket
```
public TokenBucket(long capacity,
                   long nanosBetweenTokens)
```
- Method Detail
  - currentTime
```
public abstract long currentTime()
```
    The current time in nanos. The returned value is monotonic, might wrap over and has no relationship with wall-clock.
    
    Returns:
    
    return the current time in nanos as a Long.
  - init
```
public void init()
```
    This method must be called before the token bucket can be used.
  - offer
```
public long offer(long cost)
```
    Call this (side-effecting) method whenever an element should be passed through the token-bucket. This method will return the number of nanoseconds the element needs to be delayed to conform with the token bucket parameters. Returns zero if the element can be emitted immediately. The method does not handle overflow, if an element is to be delayed longer in nanoseconds than what can be represented as a positive Long then an undefined value is returned.
    If a non-zero value is returned, it is the responsibility of the caller to not call this method before the returned delay has been elapsed (but can be called later). This class does not check or protect against early calls.
    
    Parameters:
    
    cost - How many tokens the element costs. Can be larger than the capacity of the bucket.
    
    Returns: