/*
* Copyright (c) [2016] [ <ether.camp> ]
* This file is part of the ethereumJ library.
*
* The ethereumJ library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* The ethereumJ library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the ethereumJ library. If not, see <http://www.gnu.org/licenses/>.
*/
package org.ethereum.net.rlpx.discover.table;
import org.ethereum.net.rlpx.Node;
import java.util.*;
/**
* Created by kest on 5/25/15.
*/
public class NodeTable {
private final Node node; // our node
private transient NodeBucket[] buckets;
private transient List<NodeEntry> nodes;
private Map<Node, Node> evictedCandidates = new HashMap<>();
private Map<Node, Date> expectedPongs = new HashMap<>();
public NodeTable(Node n) {
this(n, true);
}
public NodeTable(Node n, boolean includeHomeNode) {
this.node = n;
initialize();
if (includeHomeNode) {
addNode(this.node);
}
}
public Node getNode() {
return node;
}
public final void initialize()
{
nodes = new ArrayList<>();
buckets = new NodeBucket[KademliaOptions.BINS];
for (int i = 0; i < KademliaOptions.BINS; i++)
{
buckets[i] = new NodeBucket(i);
}
}
public synchronized Node addNode(Node n) {
NodeEntry e = new NodeEntry(node.getId(), n);
NodeEntry lastSeen = buckets[getBucketId(e)].addNode(e);
if (lastSeen != null) {
return lastSeen.getNode();
}
if (!nodes.contains(e)) {
nodes.add(e);
}
return null;
}
public synchronized void dropNode(Node n) {
NodeEntry e = new NodeEntry(node.getId(), n);
buckets[getBucketId(e)].dropNode(e);
nodes.remove(e);
}
public synchronized boolean contains(Node n) {
NodeEntry e = new NodeEntry(node.getId(), n);
for (NodeBucket b : buckets) {
if (b.getNodes().contains(e)) {
return true;
}
}
return false;
}
public synchronized void touchNode(Node n) {
NodeEntry e = new NodeEntry(node.getId(), n);
for (NodeBucket b : buckets) {
if (b.getNodes().contains(e)) {
b.getNodes().get(b.getNodes().indexOf(e)).touch();
break;
}
}
}
public int getBucketsCount() {
int i = 0;
for (NodeBucket b : buckets) {
if (b.getNodesCount() > 0) {
i++;
}
}
return i;
}
public synchronized NodeBucket[] getBuckets() {
return buckets;
}
public int getBucketId(NodeEntry e) {
int id = e.getDistance() - 1;
return id < 0 ? 0 : id;
}
public synchronized int getNodesCount() {
return nodes.size();
}
public synchronized List<NodeEntry> getAllNodes()
{
List<NodeEntry> nodes = new ArrayList<>();
for (NodeBucket b : buckets)
{
// nodes.addAll(b.getNodes());
for (NodeEntry e : b.getNodes())
{
if (!e.getNode().equals(node)) {
nodes.add(e);
}
}
}
// boolean res = nodes.remove(node);
return nodes;
}
public synchronized List<Node> getClosestNodes(byte[] targetId) {
List<NodeEntry> closestEntries = getAllNodes();
List<Node> closestNodes = new ArrayList<>();
Collections.sort(closestEntries, new DistanceComparator(targetId));
if (closestEntries.size() > KademliaOptions.BUCKET_SIZE) {
closestEntries = closestEntries.subList(0, KademliaOptions.BUCKET_SIZE);
}
for (NodeEntry e : closestEntries) {
if (!e.getNode().isDiscoveryNode()) {
closestNodes.add(e.getNode());
}
}
return closestNodes;
}
}