com.dallaway.sloppy
Class Bottleneck

java.lang.Object
  |
  +--com.dallaway.sloppy.Bottleneck

public class Bottleneck

extends java.lang.Object

Mechanism to work out a delay before sending data between client and server.

We make use of a staic hash of Usage objects to record the amount of data sent between a client and a server. The usage is keyed by client_id (such as IP address).

We need to do this because a browser may request multiple files at the same time, and we want to limit overall bandwidth, not just the bandwidth used on each request.

Constructor Summary

Bottleneck(java.lang.String client_id, double bpm)
Construct a new bottleneck for a give client

Method Summary

void	mark() Mark a data event.
long	restrict(int bytes_read) Compute the amount of time to sleep for to keep the client's bandwidth usage inside the BPM measure

Methods inherited from class java.lang.Object

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

Constructor Detail

Bottleneck

public Bottleneck(java.lang.String client_id,
                  double bpm)

Construct a new bottleneck for a give client

Parameters:

client_id - A way to idnetify a client

bpm - Bytes per millisecond

Method Detail

mark

public void mark()

Mark a data event. E.g., client sending data or server sending data. Call this after every receive of data to keep the BPS computation fresh.

restrict

public long restrict(int bytes_read)

Compute the amount of time to sleep for to keep the client's bandwidth usage inside the BPM measure

Returns:

sleep Milliseconds to sleep for; may be -ve indicating no sleep required