net.i2p.router.networkdb.kademlia

Class FloodfillPeerSelector

java.lang.Object

net.i2p.router.networkdb.kademlia.PeerSelector

net.i2p.router.networkdb.kademlia.FloodfillPeerSelector

class FloodfillPeerSelector
extends PeerSelector

This is where we implement semi-Kademlia with the floodfills, by selecting floodfills closest to a given key for searches and stores. Warning - most methods taking a key as an argument require the routing key, not the original key.

Field Summary

Fields inherited from class net.i2p.router.networkdb.kademlia.PeerSelector

_context, _log

Constructor Summary

Constructors

Constructor and Description
FloodfillPeerSelector(RouterContext ctx)

Method Summary

Modifier and Type	Method and Description
(package private) List<Hash>	selectFloodfillParticipants(Hash key, int maxNumRouters, KBucketSet<Hash> kbuckets) Sort the floodfills.
(package private) List<Hash>	selectFloodfillParticipants(Hash key, int howMany, Set<Hash> toIgnore, KBucketSet<Hash> kbuckets) See above for description List will not include our own hash Returns new list, may be modified.
(package private) List<Hash>	selectFloodfillParticipants(KBucketSet<Hash> kbuckets) List will not include our own hash.
(package private) List<Hash>	selectMostReliablePeers(Hash key, int maxNumRouters, Set<Hash> peersToIgnore, KBucketSet<Hash> kbuckets) Pick out peers with the floodfill capacity set, returning them first, but then after they're complete, sort via kademlia.
(package private) List<Hash>	selectNearest(Hash key, int maxNumRouters, Set<Hash> peersToIgnore, KBucketSet<Hash> kbuckets) Floodfill peers only.
(package private) List<Hash>	selectNearestExplicit(Hash key, int maxNumRouters, Set<Hash> peersToIgnore, KBucketSet<Hash> kbuckets) Pick out peers with the floodfill capacity set, returning them first, but then after they're complete, sort via kademlia.
(package private) List<Hash>	selectNearestExplicitThin(Hash key, int maxNumRouters, Set<Hash> peersToIgnore, KBucketSet<Hash> kbuckets)
(package private) List<Hash>	selectNearestExplicitThin(Hash key, int maxNumRouters, Set<Hash> peersToIgnore, KBucketSet<Hash> kbuckets, boolean preferConnected) Pick out peers with the floodfill capacity set, returning them first, but then after they're complete, sort via kademlia.

Methods inherited from class java.lang.Object

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

Constructor Detail

FloodfillPeerSelector

public FloodfillPeerSelector(RouterContext ctx)

Method Detail

selectFloodfillParticipants

List<Hash> selectFloodfillParticipants(Hash key,
                                       int maxNumRouters,
                                       KBucketSet<Hash> kbuckets)

Sort the floodfills. The challenge here is to keep the good ones at the front and the bad ones at the back. If they are all good or bad, searches and stores won't work well. List will not include our own hash. Returns new list, may be modified.

Parameters:

key - the ROUTING key (NOT the original key)

maxNumRouters - max to return

kbuckets - now unused Sorted by closest to the key if > maxNumRouters, otherwise not The list is in 3 groups - sorted by routing key within each group. Group 1: No store or lookup failure in a long time, and lookup fail rate no more than 1.5 * average Group 2: No store or lookup failure in a little while or success newer than failure Group 3: All others

Returns:

floodfills closest to the key that are not banlisted forever

selectFloodfillParticipants

List<Hash> selectFloodfillParticipants(Hash key,
                                       int howMany,
                                       Set<Hash> toIgnore,
                                       KBucketSet<Hash> kbuckets)

See above for description List will not include our own hash Returns new list, may be modified.

Parameters:

key - the ROUTING key (NOT the original key)

toIgnore - can be null

kbuckets - now unused

selectFloodfillParticipants

List<Hash> selectFloodfillParticipants(KBucketSet<Hash> kbuckets)

List will not include our own hash. List is not sorted and not shuffled. Returns new list, may be modified.

Parameters:

kbuckets - now unused

Returns:

all floodfills not banlisted forever.

selectMostReliablePeers

List<Hash> selectMostReliablePeers(Hash key,
                                   int maxNumRouters,
                                   Set<Hash> peersToIgnore,
                                   KBucketSet<Hash> kbuckets)

Pick out peers with the floodfill capacity set, returning them first, but then after they're complete, sort via kademlia. Puts the floodfill peers that are directly connected first in the list. List will not include our own hash. Returns new list, may be modified.

Specified by:

selectMostReliablePeers in class PeerSelector

Parameters:

key - the ROUTING key (NOT the original key)

peersToIgnore - can be null

Returns:

List of Hash for the peers selected

selectNearest

List<Hash> selectNearest(Hash key,
                         int maxNumRouters,
                         Set<Hash> peersToIgnore,
                         KBucketSet<Hash> kbuckets)

Floodfill peers only. Used only by HandleDatabaseLookupMessageJob to populate the DSRM. UNLESS peersToIgnore contains Hash.FAKE_HASH (all zeros), in which case this is an exploratory lookup, and the response should not include floodfills. List MAY INCLUDE our own router - add to peersToIgnore if you don't want

Specified by:

selectNearest in class PeerSelector

Parameters:

key - the original key (NOT the routing key)

peersToIgnore - can be null

Returns:

List of Hash for the peers selected, ordered

selectNearestExplicit

List<Hash> selectNearestExplicit(Hash key,
                                 int maxNumRouters,
                                 Set<Hash> peersToIgnore,
                                 KBucketSet<Hash> kbuckets)

Pick out peers with the floodfill capacity set, returning them first, but then after they're complete, sort via kademlia. Does not prefer the floodfill peers that are directly connected. List will not include our own hash. Returns new list, may be modified.

Specified by:

selectNearestExplicit in class PeerSelector

Parameters:

key - the ROUTING key (NOT the original key)

peersToIgnore - can be null

Returns:

List of Hash for the peers selected

selectNearestExplicitThin

List<Hash> selectNearestExplicitThin(Hash key,
                                     int maxNumRouters,
                                     Set<Hash> peersToIgnore,
                                     KBucketSet<Hash> kbuckets)

Specified by:

selectNearestExplicitThin in class PeerSelector

selectNearestExplicitThin

List<Hash> selectNearestExplicitThin(Hash key,
                                     int maxNumRouters,
                                     Set<Hash> peersToIgnore,
                                     KBucketSet<Hash> kbuckets,
                                     boolean preferConnected)

Pick out peers with the floodfill capacity set, returning them first, but then after they're complete, sort via kademlia. List will not include our own hash. Returns new list, may be modified.

Parameters:

key - the ROUTING key (NOT the original key)

peersToIgnore - can be null

Returns:

List of Hash for the peers selected