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feat: modify PUT operation to place N (configurable) replicas for DAS DHT #58

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feat: modify PUT operation to place N (configurable) replicas for DAS DHT #58

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1 change: 1 addition & 0 deletions simulator/config/dasprotocoldht1k.cfg
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Original file line number Diff line number Diff line change
Expand Up @@ -59,6 +59,7 @@ protocol.3kademlia.reportMsg true
protocol.3kademlia.BITS 256
protocol.3kademlia.NBUCKETS 17
protocol.3kademlia.FINDMODE 1
protocol.3kademlia.N 1

#Kademlia protocol with 256 bits identifiers and 17 buckets in the routing table.
#Use FINDMODE 1 to send FINDMODE messages looking for distance to specific node instead of sending the id of the node like in DEVP2P
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15 changes: 13 additions & 2 deletions simulator/src/main/java/peersim/kademlia/KademliaProtocol.java
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,7 @@
import java.math.BigInteger;
import java.util.Arrays;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.TreeMap;
import java.util.logging.ConsoleHandler;
import java.util.logging.Level;
Expand Down Expand Up @@ -41,6 +42,8 @@ public class KademliaProtocol implements Cloneable, EDProtocol {
// VARIABLE PARAMETERS
/** The parameter name for K. */
final String PAR_K = "K";
/** The parameter name for N replicas when PUT operation. */
final String PAR_N = "N";
/** The parameter name for ALPHA. */
final String PAR_ALPHA = "ALPHA";
/** The parameter name for BITS. */
Expand Down Expand Up @@ -91,6 +94,7 @@ public class KademliaProtocol implements Cloneable, EDProtocol {

private boolean msgReport;

private int N;
/**
* Replicate this object by returning an identical copy. It is called by the initializer and do
* not fill any particular field.
Expand Down Expand Up @@ -148,6 +152,10 @@ private void _init() {
KademliaCommonConfig.FINDMODE =
Configuration.getInt(prefix + "." + PAR_FINDMODE, KademliaCommonConfig.FINDMODE);

N = Configuration.getInt(prefix + "." + PAR_N, KademliaCommonConfig.K);

// N number of replicas in PUT_OPERATION can not be higher than K closest nodes.
if (N > KademliaCommonConfig.K) N = KademliaCommonConfig.K;
_ALREADY_INSTALLED = true;
}

Expand Down Expand Up @@ -274,8 +282,11 @@ private void handleResponse(Message m, int myPid) {
== KademliaCommonConfig.ALPHA) { // No new neighbor and no outstanding requests
// Search operation finished
if (fop instanceof PutOperation) {
// Create and send a put request to all neighbors in the neighbors list
for (BigInteger id : fop.getNeighboursList()) {
// Create and send a put request to N neighbors from the K closest in the neighbors list
List<BigInteger> kclosest = fop.getNeighboursList();
List<BigInteger> selectedNodes = kclosest.subList(0, N);
for (BigInteger id : selectedNodes) {

// Create a put request
Message request = new Message(Message.MSG_PUT);
request.operationId = m.operationId;
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