edu.harvard.deas.hyperenc
Class VSatRandomSource

java.lang.Object
  edu.harvard.deas.hyperenc.VSatRandomSource

All Implemented Interfaces:

RandomSource, Serializable

public class VSatRandomSource
extends Object
implements RandomSource

The VSatRandomSource, given two 32-bit integers, the PSN selection key and the page request key, obtains a page of random data from a PSN. It selects the PSN from a PSN list specified at construction, and then sends the page request key to the PSN, which replies by sending a page.

See Also:

Serialized Form

Field Summary

static int

DEFAULT_PSN_PORT The port on which PSNs listen by default; connections to PSNs will attempt to connect to this port.

Constructor Summary

VSatRandomSource(NNLookup<String> psnList)
Constructs a new VSatRandomSource.

Method Summary

void	getPage(byte[] block, byte[] page) Gets a page of random bits.

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_PSN_PORT

public static final int DEFAULT_PSN_PORT

The port on which PSNs listen by default; connections to PSNs will attempt to connect to this port.

See Also:

Constant Field Values

Constructor Detail

VSatRandomSource

public VSatRandomSource(NNLookup<String> psnList)

Constructs a new VSatRandomSource.

Parameters:

psnList - a list of PSN hostnames/IPs with associated integer keys. This list will be used to choose PSNs; the PSN with the numerically closest key, per the NNLookup.get(int) method, is used.

Method Detail

getPage

public void getPage(byte[] block,
                    byte[] page)
             throws PageCreationException

Gets a page of random bits.

Specified by:

getPage in interface RandomSource

Parameters:

block - A buffer of random bytes used used to get the PSN info/id from the central server (must be exactly 8 bytes long)

page - An empty array to hold the returned random data

Throws:

PageCreationException