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Added getDistance() method to Number160. Added .gradle to .gitignore

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This commit is contained in:
ChronosX88 2019-04-24 12:42:54 +04:00
parent a598cbb9cb
commit 5b458eff27
3 changed files with 13 additions and 56 deletions
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3
.gitignore vendored
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@ -1,3 +1,4 @@
/.idea
/build
/out
/out
/.gradle

52
src/main/java/io/gitub/chronosx88/influencedht/core/Number160.java
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@ -475,60 +475,16 @@ public final class Number160 extends Number implements Comparable<Number160> {
return Utils.makeSHAHash(string);
}
/**
* Counts the number of leading 0's in this NodeId
*
* @return Integer The number of leading 0's
*/
public int getFirstSetBitIndex()
{
int prefixLength = 0;
for (byte b : this.toByteArray())
{
if (b == 0)
{
prefixLength += 8;
}
else
{
/* If the byte is not 0, we need to count how many MSBs are 0 */
int count = 0;
for (int i = 7; i >= 0; i--)
{
boolean a = (b & (1 << i)) == 0;
if (a)
{
count++;
}
else
{
break; // Reset the count if we encounter a non-zero number
}
}
/* Add the count of MSB 0s to the prefix length */
prefixLength += count;
/* Break here since we've now covered the MSB 0s */
break;
}
}
return prefixLength;
}
/**
* Gets the distance from this ID to another ID
*
* @param to
* @param to Another ID
*
* @return Integer The distance
* @return The distance
*/
public int getDistance(Number160 to)
{
// Compute the xor of this and to
// Get the index i of the first set bit of the xor returned NodeId
// The distance between them is ID_LENGTH - i
return BITS - this.xor(to).getFirstSetBitIndex();
// Compute the xor of this and get bit length
return this.xor(to).bitLength();
}
}

14
src/main/kotlin/io/github/chronosx88/influencedht/core/routing/KademliaRoutingTable.kt
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@ -33,7 +33,7 @@ class KademliaRoutingTable(
@Synchronized get() {
val nodes = ArrayList<PeerAddress>()
for (b in this.buckets!!) {
for (b in this.buckets) {
for (c in b.getContacts()) {
nodes.add(c.getPeerAddress())
}
@ -49,7 +49,7 @@ class KademliaRoutingTable(
get() {
val contacts = ArrayList<PeerContact>()
for (b in this.buckets!!) {
for (b in this.buckets) {
contacts.addAll(b.getContacts())
}
@ -86,7 +86,7 @@ class KademliaRoutingTable(
*/
@Synchronized
fun insert(c: PeerContact) {
this.buckets!![this.getBucketId(c.getPeerAddress().nodeId)].insert(c)
this.buckets[this.getBucketId(c.getPeerAddress().nodeId)].insert(c)
}
/**
@ -96,7 +96,7 @@ class KademliaRoutingTable(
*/
@Synchronized
fun insert(n: PeerAddress) {
this.buckets!![this.getBucketId(n.nodeId)].insert(n)
this.buckets[this.getBucketId(n.nodeId)].insert(n)
}
/**
@ -107,7 +107,7 @@ class KademliaRoutingTable(
* @return Integer The bucket ID in which the given node should be placed.
*/
fun getBucketId(nid: Number160?): Int {
val bId = this.localNode.nodeId!!.xor(nid).bitLength() - 1
val bId = this.localNode.nodeId!!.getDistance(nid) - 1
/* If we are trying to insert a node into it's own routing table, then the bucket ID will be -1, so let's just keep it in bucket 0 */
return if (bId < 0) 0 else bId
@ -163,14 +163,14 @@ class KademliaRoutingTable(
val bucketId = this.getBucketId(n.nodeId)
/* Remove the contact from the bucket */
this.buckets!![bucketId].removeNode(n)
this.buckets[bucketId].removeNode(n)
}
@Synchronized
override fun toString(): String {
val sb = StringBuilder("\n ***************** \n")
var totalContacts = 0
for (b in this.buckets!!) {
for (b in this.buckets) {
if (b.numContacts() > 0) {
totalContacts += b.numContacts()
sb.append("# nodes in Bucket with depth ")