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HChord_L.cc
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HChord_L.cc
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#include <cfloat>
#include <assert.h>
#include <GlobalStatistics.h>
#include <Comparator.h>
#include <BootstrapList.h>
#include <HChordFingerTable.h>
#include <HChordSuccessorList.h>
#include "HChord_L.h"
#include "HChord_U.h"
Define_Module(HChord_L);
HChord_L::HChord_L()
{
stabilize_timer = stabilize_timer = NULL;
}
void HChord_L::initializeOverlay(int stage,NodeHandle node)
{
Enter_Method("initializeOverlay");
successorListSize = par("successorListSize");
joinRetry = par("joinRetry");
stabilizeRetry = par("stabilizeRetry");
joinDelay = par("joinDelay");
stabilizeDelay = par("stabilizeDelay");
fixfingersDelay = par("fixfingersDelay");
aggressiveJoinMode = par("aggressiveJoinMode");
extendedFingerTable = par("extendedFingerTable");
numFingerCandidates = par("numFingerCandidates");
keyLength = OverlayKey::getLength();
missingPredecessorStabRequests = 0;
missingSuccessorStabResponses = 0;
thisNode = node;
// statistics
joinCount = 0;
stabilizeCount = 0;
fixfingersCount = 0;
notifyCount = 0;
newsuccessorhintCount = 0;
joinBytesSent = 0;
stabilizeBytesSent = 0;
notifyBytesSent = 0;
fixfingersBytesSent = 0;
newsuccessorhintBytesSent = 0;
// find friend modules
findFriendModules();
// initializeFriendModules();
// add some watches
WATCH(predecessorNode);
WATCH(thisNode);
WATCH(bootstrapNode);
WATCH(joinRetry);
WATCH(SuperPeerNode);
WATCH(SuperPeerPre);
//WATCH(missingPredecessorStabRequests);
//WATCH(missingSuccessorStabResponses);
// self-messages
// join_timer = new cMessage("join_timer");
stabilize_timer= new cMessage("stabilize_timer");
fixfingers_timer = new cMessage("fixfingers_timer");
predecessorNode = NodeHandle::UNSPECIFIED_NODE;
this->state = READY;
//initiate stabilization protocol
cancelEvent(stabilize_timer);
scheduleAt(simulation.simTime() + stabilizeDelay, stabilize_timer);
// initiate finger repair protocol
cancelEvent(fixfingers_timer);
scheduleAt(simulation.simTime() + fixfingersDelay,fixfingers_timer);
}
HChord_L::~HChord_L()
{
// destroy self timer messages
// cancelAndDelete(join_timer);
cancelAndDelete(stabilize_timer);
cancelAndDelete(fixfingers_timer);
}
void HChord_L::handleMessage(cMessage* msg)
{
// catch JOIN timer
//if (msg->isName("join_timer")) {
// handleJoinTimerExpired(msg);
//
// catch STABILIZE timer
if (msg->isName("stabilize_timer")) {
handleStabilizeTimerExpired(msg);
}
// catch FIX_FINGERS timer
else if (msg->isName("fixfingers_timer")) {
handleFixFingersTimerExpired(msg);
}
// unknown self message
else {
handleUDPMessage(msg);
// error("HChord_L::handleTimerEvent(): received self message of "
// "unknown type!");
}
}
void HChord_L::handleUDPMessage(cMessage* msg)
{
HChordMessage* hchordMsg = check_and_cast<HChordMessage*>(msg);
switch(hchordMsg->getMesg_type()) {
case JOIN_REQUEST :
{
HJoinCall * hcjoin = check_and_cast<HJoinCall *>(msg);
handleJoinRequest(hcjoin);
}
break;
case JOIN_RESPONSE :
{
HJoinResponse *hcresp = check_and_cast<HJoinResponse *>(msg);
handleJoinResponse(hcresp);
}
break;
case NEW_SUCCESSOR_HINT :
{
HNewSuccessorHintMsg *newSucc = check_and_cast<HNewSuccessorHintMsg *>(msg);
handleNewSuccessorHint(newSucc);
}
break;
case STABILIZE_CALL :
{
HStabilizeCall *stab = check_and_cast<HStabilizeCall *>(msg);
handleStabilizeCall(stab);
}
break;
case STABILIZE_RESPONSE :
{
HStabilizeResponse *stabr = check_and_cast<HStabilizeResponse *>(msg);
handleStabilizeResponse(stabr);
}
break;
case NOTIFY_CALL :
{
HNotifyCall *call = check_and_cast<HNotifyCall *>(msg);
handleNotifyCall(call);
}
break;
case NOTIFY_RESPONSE :
{
HNotifyResponse *notr = check_and_cast<HNotifyResponse *>(msg);
handleNotifyResponse(notr);
}
break;
case FIXFINGERS_CALL :
{
HFixfingersCall *fix = check_and_cast<HFixfingersCall *>(msg);
handleFixfingersCall(fix);
}
break;
case FIXFINGERS_RESPONSE:
{
HFixfingersResponse *fixr = check_and_cast<HFixfingersResponse *>(msg);
handleFixfingersResponse(fixr);
}
break;
default:
error("handleUDPMessage(): Unknown message type!");
break;
}
//delete chordMsg;
}
int HChord_L::getMaxNumSiblings()
{
return successorListSize;
}
int HChord_L::getMaxNumRedundantNodes()
{
return extendedFingerTable ? numFingerCandidates : 1;
}
bool HChord_L::isSiblingFor(const NodeHandle& node,
const OverlayKey& key,
int numSiblings,
bool* err)
{
EV<<"is sibling for key looking for "<<key<<"num = "<<numSiblings<<"node is "<<node<<endl;
if (key.isUnspecified())
error("HChord_L::isSiblingFor(): key is unspecified!");
if (state != READY)
{
*err = true;
return false;
}
if (numSiblings > getMaxNumSiblings())
{
opp_error("HChord_L::isSiblingFor(): numSiblings too big!");
}
// set default number of siblings to consider
if (numSiblings == -1) numSiblings = getMaxNumSiblings();
// if this is the first and only node on the ring, it is responsible
if ((predecessorNode.isUnspecified()) && (node == thisNode))
{
if(successorList->isEmpty() || (node.key == key))
{
*err = false;
EV<<"issibling pre uns and thisNode and suc empty or key=thiskey ret true "<<endl;
return true;
}
else
{
*err = true;
EV<<"issibling pre uns and thisNode and suc empty or key=thiskey ret false"<<endl;
return false;
}
}
if ((node == thisNode) && (key.isBetweenR(predecessorNode.key, thisNode.key)))
{
*err = false;
EV<<"node is this key btwn pre and this"<<endl;
return true;
}
NodeHandle prevNode = predecessorNode;
NodeHandle curNode;
for (int i = -1; i < (int)successorList->getSize(); i++, prevNode = curNode)
{
if (i < 0)
{
curNode = thisNode;
}
else
{
curNode = successorList->getSuccessor(i);
}
if (node == curNode)
{
// is the message destined for curNode?
if (key.isBetweenR(prevNode.key, curNode.key))
{
if (numSiblings <= ((int)successorList->getSize() - i))
{
*err = false;
EV<<"key btwn suc "<<i<<endl;
return true;
}
else
{
*err = true;
return false;
}
}
else
{
// the key doesn't directly belong to this node, but
// the node could be a sibling for this key
if (numSiblings <= 1)
{
*err = false;
return false;
}
else
{
// In Chord we don't know if we belong to the
// replicaSet of one of our predecessors
*err = true;
return false;
}
}
}
}
// node is not in our neighborSet
*err = true;
return false;
}
NodeHandle HChord_L::findNode_h(const OverlayKey& key,int numSiblings,int numRedundantNodes , BaseOverlayMessage* msg)
{
bool err;
EV<<endl<<"FindNode() called sibligs "<<numSiblings<<" with key "<<key<<endl;
NodeHandle nextHop=NodeHandle::UNSPECIFIED_NODE;
if (state != READY)
return nextHop;
// if key is unspecified, the message is for this node
if (key.isUnspecified())
{
nextHop = thisNode;
}
// the message is destined for this node
else if (isSiblingFor(thisNode, key, 1, &err))
{
nextHop = thisNode;
}
// the message destined for our successor
else if (key.isBetweenR(thisNode.key,successorList->getSuccessor().key))
{
nextHop = successorList->getSuccessor();
}
// find next hop with finger table and/or successor list
else
{
nextHop = closestPreceedingNode(key);
}
return nextHop;
}
NodeHandle HChord_L::closestPreceedingNode(const OverlayKey& key)
{
NodeHandle tempHandle = NodeHandle::UNSPECIFIED_NODE;
EV<<"Closestpreceeding node "<<key<<endl;
// find the closest preceding node in the successor list of upper overlay
for (int j = successorList->getSize() - 1; j >= 0; j--)
{
if(successorList->getSuccessor(j).key.isBetweenR(thisNode.key, key))
{
tempHandle = successorList->getSuccessor(j);
break;
}
}
if(tempHandle.isUnspecified())
{
std::stringstream temp;
temp << "HChord_L::closestPreceedingNode(): Successor list broken "
<< thisNode.key << " " << key;
EV<<"HChord_L::closestPreceedingNode(): Successor list broken "<<thisNode.key<<" "<<key;
throw new cRuntimeError(temp.str().c_str());
}
NodeHandle nextHop;
//look in finger table
for (int i = fingerTable->getSize() - 1; i >= 0; i--)
{
if (fingerTable->getFinger(i).key.isBetweenLR(tempHandle.key, key))
{
if(!extendedFingerTable)
{
//nextHop = new NodeVector();
nextHop=fingerTable->getFinger(i);
EV << "[HChord_L::closestPreceedingNode() @ " << thisNode.ip
<< " (" << thisNode.key.toString(16) << ")]\n"
<< " ClosestPreceedingNode: node " << thisNode
<< " for key " << key << "\n"
<< " finger " << fingerTable->getFinger(i).key
<< " better than \n"
<< " " << tempHandle.key
<< endl;
return nextHop;
}
else
{
//return fingerTable_upper->getFinger(i, key);
}
}
}
EV << "[HChord_L::closestPreceedingNode() @ " << thisNode.ip
<<" (" << thisNode.key.toString(16) << ")]\n"
<< " No finger found"
<< endl;
// if no finger is found lookup the rest of the successor list
for(int i = successorList->getSize() - 1; i >= 0; i--)
{
if(successorList->getSuccessor(i).key.isBetween(thisNode.key, key))
{
nextHop=successorList->getSuccessor(i);
}
}
if(!nextHop.isUnspecified())
return nextHop;
// if this is the first and only node on the ring, it is responsible
if ((predecessorNode.isUnspecified()) &&(successorList->getSuccessor() == thisNode))
{
nextHop=(thisNode);
return nextHop;
}
// if there is still no node found return NodeHandle::UNSPECIFIED_NODE
std::stringstream temp("Error in HChord_L::closestPreceedingNode()!\n");
temp << thisNode.key << " " << key;
error(temp.str().c_str());
nextHop=(NodeHandle::UNSPECIFIED_NODE);
return nextHop;
}
/*void HChord_L::recordOverlaySentStats(BaseOverlayMessage* msg)
{
BaseOverlayMessage* innerMsg;
if (msg->getType() == OVERLAYROUTE)
innerMsg = dynamic_cast<BaseOverlayMessage*>(msg->encapsulatedMsg());
else
innerMsg = msg;
switch (innerMsg->getType()) {
case OVERLAYSIGNALING: {
HChordMessage* chordMsg = dynamic_cast<HChordMessage*>(innerMsg);
switch(chordMsg->getCommand()) {
case NEWSUCCESSORHINT:
RECORD_STATS(newsuccessorhintCount++; newsuccessorhintBytesSent +=
msg->byteLength());
break;
}
break;
}
case RPC: {
if ((dynamic_cast<StabilizeCall*>(innerMsg) != NULL) ||
(dynamic_cast<StabilizeResponse*>(innerMsg) != NULL)) {
RECORD_STATS(stabilizeCount++; stabilizeBytesSent +=
msg->byteLength());
} else if ((dynamic_cast<NotifyCall*>(innerMsg) != NULL) ||
(dynamic_cast<NotifyResponse*>(innerMsg) != NULL)) {
RECORD_STATS(notifyCount++; notifyBytesSent +=
msg->byteLength());
} else if ((dynamic_cast<FixfingersCall*>(innerMsg) != NULL) ||
(dynamic_cast<FixfingersResponse*>(innerMsg) != NULL)) {
RECORD_STATS(fixfingersCount++; fixfingersBytesSent +=
msg->byteLength());
} else if ((dynamic_cast<JoinCall*>(innerMsg) != NULL) ||
(dynamic_cast<JoinResponse*>(innerMsg) != NULL)) {
RECORD_STATS(joinCount++; joinBytesSent += msg->byteLength());
}
break;
}
}
}
*/
void HChord_L::finishOverlay()
{
// remove this node from the bootstrap list
// bootstrapList->removeBootstrapNode(thisNode);
}
/* simtime_t time = globalStatistics->calcMeasuredLifetime(creationTime);
if(time == 0) return;
globalStatistics->addStdDev("HChord: Sent JOIN Messages/s",
joinCount / time);
globalStatistics->addStdDev("HChord: Sent NEWSUCCESSORHINT Messages/s",
newsuccessorhintCount / time);
globalStatistics->addStdDev("HChord: Sent STABILIZE Messages/s",
stabilizeCount / time);
globalStatistics->addStdDev("HChord: Sent NOTIFY Messages/s",
notifyCount / time);
globalStatistics->addStdDev("HChord: Sent FIX_FINGERS Messages/s",
fixfingersCount / time);
globalStatistics->addStdDev("HChord: Sent JOIN Bytes/s",
joinBytesSent / time);
globalStatistics->addStdDev("HChord: Sent NEWSUCCESSORHINT Bytes/s",
newsuccessorhintBytesSent / time);
globalStatistics->addStdDev("HChord: Sent STABILIZE Bytes/s",
stabilizeBytesSent / time);
globalStatistics->addStdDev("HChord: Sent NOTIFY Bytes/s",
notifyBytesSent / time);
globalStatistics->addStdDev("HChord: Sent FIX_FINGERS Bytes/s",
fixfingersBytesSent / time);
}
*/
void HChord_L::handleStabilizeTimerExpired(cMessage* msg)
{
if (state != READY)
return;
if (missingPredecessorStabRequests >= stabilizeRetry) {
// predecessor node seems to be dead
// remove it from the predecessor / successor lists
successorList ->removeSuccessor(predecessorNode);
//predecessorIsDead();
////callUpdate(predecessorNode, false);
predecessorNode = NodeHandle::UNSPECIFIED_NODE;
missingPredecessorStabRequests = 0;
updateTooltip();
}
if (missingSuccessorStabResponses >= stabilizeRetry) {
// successor node seems to be dead
// remove it from the predecessor / successor list
//successorIsDead();
NodeHandle successor = successorList->popSuccessor();
// if we had a ring consisting of 2 nodes and our successor seems
// to be dead. Remove also predecessor because the successor
// and predecessor are the same node
if ((!predecessorNode.isUnspecified()) &&
predecessorNode == successor) {
//predecessorIsDead();
//callUpdate(predecessorNode, false);
predecessorNode = NodeHandle::UNSPECIFIED_NODE;
}
missingSuccessorStabResponses = 0;
updateTooltip();
if (successorList->isEmpty()) {
//changeState(INIT);
//changeState(BOOTSTRAP);
return;
}
}
if (!successorList->isEmpty()) {
// call STABILIZE RPC
HStabilizeCall* call = new HStabilizeCall("HStabilizeCall");
call->setLength(HSTABILIZECALL_L(call));
//call->setOverlay(UPPER_OVERLAY);
call->setMesg_type(STABILIZE_CALL);
call->setSrc(thisNode);
call->setLength(HSTABILIZECALL_L(call));
call->setDest(successorList->getSuccessor());
sendMessageToUDP(successorList->getSuccessor(), call);
missingPredecessorStabRequests++;
missingSuccessorStabResponses++;
}
// check if fingers are still alive and remove unreachable finger nodes
// schedule next stabilization process
cancelEvent(stabilize_timer);
scheduleAt(simulation.simTime() + stabilizeDelay, msg);
}
void HChord_L::handleFixFingersTimerExpired(cMessage* msg)
{
EV<<endl<<endl<<thisNode<<":Fix fingers timer reached "<<endl;
if ((state != READY) || successorList->isEmpty())
return;
OverlayKey offset, lookupKey;
for (uint nextFinger = 0; nextFinger < thisNode.key.getLength()-1;nextFinger++)
{
// calculate "n + 2^(i - 1)"
OverlayKey k=thisNode.key;
offset = OverlayKey::pow2(nextFinger);
lookupKey = k + offset;
// send message only for non-trivial fingers
if (offset > successorList->getSuccessor().key - k)
{
EV<<thisNode<<": lookup key "<<lookupKey<<" sending fix fingers call fingerno "<<nextFinger<<endl;
//if we have offset > super peer then point it to super peer as
//all nodes in sub overlay have less id than sp
//special case is last sp
if(offset>=SuperPeerNode.key&&thisNode.key<=SuperPeerNode.key)
{
fingerTable->setFinger(nextFinger,SuperPeerNode);
EV<<thisNode<<" lookup key "<<lookupKey<<" setting to super peer fingr no "<<nextFinger<<endl;
}
else if(!SuperPeerPre.isUnspecified()&&offset<SuperPeerPre.key &&thisNode.key<=SuperPeerNode.key)//less than the predecessor
{
fingerTable->setFinger(nextFinger,SuperPeerNode);
EV<<thisNode<<" lookup key "<<lookupKey<<" setting to super peer pre finger no "<<nextFinger<<endl;
}
else if(offset<=SuperPeerNode.key && thisNode.key>SuperPeerNode.key)//this is exeption condition
{
fingerTable->setFinger(nextFinger,SuperPeerNode);
EV<<thisNode<<" lookup key "<<lookupKey<<" setting to super peer fingr no "<<nextFinger<<endl;
}
else
{
// call FIXFINGER RPC
HFixfingersCall* call = new HFixfingersCall("HFixfingersCall");
call->setFinger(nextFinger);
call->setSrc(thisNode);
call->setLookupKey(lookupKey);
//call->setOverlay(UPPER_OVERLAY);
call->setMesg_type(FIXFINGERS_CALL);
call->setLength(HFIXFINGERSCALL_L(call));
NodeHandle nextHop = findNode_h(lookupKey,1,1,call);
call->setDest(nextHop);
sendMessageToUDP(nextHop,call);
}
}
else
{
// let trivial fingers point to the successor node
EV<<thisNode<<" lookup key "<<lookupKey<<" setting to successor fingr no "<<nextFinger<<endl;
fingerTable->setFinger(nextFinger, successorList->getSuccessor());
}
}
// schedule next finger repair process
cancelEvent(fixfingers_timer);
scheduleAt(simulation.simTime() + fixfingersDelay, msg);
}
void HChord_L::handleNewSuccessorHint(HNewSuccessorHintMsg* hchordMsg)
{
HNewSuccessorHintMsg* newSuccessorHintMsg =
check_and_cast<HNewSuccessorHintMsg*>(hchordMsg);
// fetch the successor's predecessor
NodeHandle predecessor = newSuccessorHintMsg->getPre();
// is the successor's predecessor a new successor for this node?
// look here
OverlayKey tempkey=successorList->getSuccessor().key;
NodeHandle curr_node=thisNode;
if (predecessor.key.isBetween(curr_node.key,tempkey)||(curr_node.key == tempkey))
{
// add the successor's predecessor to the successor list
successorList->addSuccessor(predecessor);
updateTooltip();
}
delete hchordMsg;
}
void HChord_L::handleJoinRequest(HJoinCall *joinCall )
{
NodeHandle requestor = joinCall->getSrc();
bool err;
if(isSiblingFor(thisNode,requestor.key,1,&err))//message is destined for this node
{
processJoinRequest(joinCall);
}
else
{
//node is destined for anoter node
//find it and send it
NodeHandle nextHop = findNode_h(requestor.key,1,1,joinCall);
if(!nextHop.isUnspecified())
{
joinCall->setDest(nextHop);
sendMessageToUDP(nextHop,joinCall);
}
}
}
void HChord_L::processJoinRequest(HJoinCall *joinCall)
{
//SuperPeerNode = joinCall->getSuperPeerNode();
if(joinCall->getSrc()==thisNode)
{
delete joinCall;
return;
}
HJoinResponse* joinResponse = new HJoinResponse("HJoinResponse");
NodeHandle src = joinCall->getSrc();
joinResponse->setMesg_type(JOIN_RESPONSE);
joinResponse->setSrc(thisNode);
int sucNum = successorList->getSize();
joinResponse->setSucNum(sucNum);
joinResponse->setSucNodeArraySize(sucNum);
joinResponse->setDest(src);
NodeHandle n;
for (int k = 0; k < sucNum; k++)
{
n = successorList->getSuccessor(k);
joinResponse->setSucNode(k,n);
}
// sent our predecessor as hint to the joining node
if (predecessorNode.isUnspecified() && successorList->isEmpty())
{
// we are the only node in the ring
n = thisNode;
joinResponse->setPreNode(n);
}
else
{
joinResponse->setPreNode(predecessorNode);
}
joinResponse->setLength(HJOINRESPONSE_L(joinResponse));
//add super peer
joinResponse->setSuperPeerNode(SuperPeerNode);
sendMessageToUDP(src,joinResponse);
if(aggressiveJoinMode)
{
// aggressiveJoinMode differs from standard join operations:
// 1. set our predecessor pointer to the joining node
// 2. send our old predecessor as hint in JoinResponse msgs
// 3. send a NEWSUCCESSORHINT to our old predecessor to update
// its successor pointer
// send NEWSUCCESSORHINT to our old predecessor
if (!predecessorNode.isUnspecified())
{
HNewSuccessorHintMsg * newSuccessorHintMsg = new HNewSuccessorHintMsg ("NEWSUCCESSORHINT");
newSuccessorHintMsg->setMesg_type(NEW_SUCCESSOR_HINT);
//newSuccessorHintMsg->setOverlay(LOWER_OVERLAY);
n = thisNode;
newSuccessorHintMsg->setSrc(n);
n = src;
newSuccessorHintMsg->setDest(predecessorNode);
newSuccessorHintMsg->setPre(n);
newSuccessorHintMsg->setLength(HNEWSUCCESSORHINT_L(newSuccessorHintMsg));
sendMessageToUDP(predecessorNode, newSuccessorHintMsg);
}
if (predecessorNode.isUnspecified() || (predecessorNode != src ))
{
// send update to application if we've got a new predecessor
if (!predecessorNode.isUnspecified())
{
//callUpdate(predecessorNode, false);
}
//callUpdate(src, true);
// the requestor is our new predecessor
predecessorNode = src;
}
// if we don't have a successor, the requestor is also our new successor
if (successorList->isEmpty())
{
successorList->addSuccessor(src);
}
updateTooltip();
}
delete joinCall;
}
void HChord_L::handleJoinResponse(HJoinResponse* joinResponse)
{
// determine the numer of successor nodes to add
int sucNum = successorListSize - 1;
if (joinResponse->getSucNum() < successorListSize - 1)
{
sucNum = joinResponse->getSucNum();
}
// add successor node(s)
for (int k = 0; k < sucNum; k++)
{
NodeHandle successor = joinResponse->getSucNode(k);
successorList->addSuccessor(successor);
}
// \todo {check commented out addSuccessor (Schenk)}
//successorList->addSuccessor(joinResponse->getSrcNode());
// the sender of this message is our new successor
NodeHandle n = joinResponse->getSrc();
successorList->addSuccessor(n);
SuperPeerNode = joinResponse->getSuperPeerNode();
SuperPeerPre = joinResponse->getSuperPeerPre();
// in aggressiveJoinMode: use hint in JoinResponse
// to set our new predecessor
if (aggressiveJoinMode)
{
// it is possible that the joinResponse doesn't contain a valid
// predecessor especially when merging two partitions
if (!joinResponse->getPreNode().isUnspecified())
{
if (!predecessorNode.isUnspecified())
{
// inform the original predecessor about the new predecessor
/* if (mergeOptimizationL2) {
NewSuccessorHintMessage* newSuccessorHintMsg =
new NewSuccessorHintMessage("NEWSUCCESSORHINT");
newSuccessorHintMsg->setCommand(NEWSUCCESSORHINT);
newSuccessorHintMsg->setSrcNode(thisNode);
newSuccessorHintMsg->setPreNode(joinResponse->getPreNode());
newSuccessorHintMsg->
setLength(NEWSUCCESSORHINT_L(newSuccessorHintMsg));
sendMessageToUDP(predecessorNode, newSuccessorHintMsg);
}*/
}
if (!predecessorNode.isUnspecified() && !joinResponse->getPreNode().isUnspecified()&& predecessorNode!= joinResponse->getPreNode())
{
//callUpdate(predecessorNode, false);
}
predecessorNode = joinResponse->getPreNode();
//callUpdate(predecessorNode, true);
}
}
updateTooltip();
//changeState(READY);
//bootstrapList->removeBootstrapNode(thisNode);
// immediate stabilization protocol
cancelEvent(stabilize_timer);
scheduleAt(simulation.simTime(), stabilize_timer);
// immediate finger repair protocol
cancelEvent(fixfingers_timer);
scheduleAt(simulation.simTime(), fixfingers_timer);
//immidiate stabilize super peer
if(SuperPeerNode == thisNode)
return;
HStabilizeSuperPeerCall *spstab = new HStabilizeSuperPeerCall("StabilizeSuperPeerCall");
spstab->setSrc(thisNode);
spstab->setDest(SuperPeerNode);
spstab->setMesg_type(STABILIZE_SUPER_PEER_CALL);
sendMessageToUDP(SuperPeerNode,spstab);
delete joinResponse;
}
void HChord_L::handleStabilizeCall(HStabilizeCall* call)
{
// our predecessor seems to be alive
missingPredecessorStabRequests = 0;
// reply with StabilizeResponse message
HStabilizeResponse* stabilizeResponse = new HStabilizeResponse("HStabilizeResponse");
stabilizeResponse->setPre(predecessorNode);
stabilizeResponse->setDest(call->getSrc());
stabilizeResponse->setSrc(thisNode);
// stabilizeResponse->setOverlay(UPPER_OVERLAY);
stabilizeResponse->setMesg_type(STABILIZE_RESPONSE);
stabilizeResponse->setLength(HSTABILIZERESPONSE_L(stabilizeResponse));
sendMessageToUDP(call->getSrc(), stabilizeResponse);
delete call;
}
void HChord_L::handleStabilizeResponse(HStabilizeResponse* stabilizeResponse)
{
// our successor seems to be alive
missingSuccessorStabResponses= 0;
// fetch the successor's predecessor
NodeHandle predecessor = stabilizeResponse->getPre();
// is the successor's predecessor a new successor for this node?
if (successorList->isEmpty() || predecessor.key.isBetween(thisNode.key,successorList->getSuccessor().key))
{
// add the successor's predecessor to the successor list
successorList->addSuccessor(predecessor);
updateTooltip();
}
// compile NOTIFY RPC
HNotifyCall* notifyCall = new HNotifyCall("NotifyCall");
notifyCall->setLength(HNOTIFYCALL_L(notifyCall));
notifyCall->setSrc(thisNode);
notifyCall->setDest(successorList->getSuccessor());
notifyCall->setMesg_type(NOTIFY_CALL);
//notifyCall->setOverlay(UPPER_OVERLAY);
sendMessageToUDP(successorList->getSuccessor(), notifyCall);
delete stabilizeResponse;
}
void HChord_L::handleNotifyCall(HNotifyCall* call)
{
// our predecessor seems to be alive
missingPredecessorStabRequests = 0;
bool newPredecessorSet = false;
NodeHandle newPredecessor = call->getSrc();
// is the new predecessor closer than the current one?
if (predecessorNode.isUnspecified() ||newPredecessor.key.isBetween(predecessorNode.key, thisNode.key))
{
if ((predecessorNode.isUnspecified()) ||(newPredecessor != predecessorNode))
{
// send update to application if we've got a new predecessor
if (!predecessorNode.isUnspecified())
{
//callUpdate(predecessorNode, false);
}
//callUpdate(newPredecessor, true);
// inform the original predecessor about the new predecessor
// set up new predecessor
predecessorNode = newPredecessor;
updateTooltip();
newPredecessorSet = true;
}
}
// compile NOTIFY response
HNotifyResponse* notifyResponse = new HNotifyResponse("HNotifyResponse");
if(upper->super_peer||successorList->getSuccessor().key<thisNode.key)//last node special
{
notifyResponse->setSucNum(0);
notifyResponse->setSucNodeArraySize(0);
notifyResponse->setSrcNode(thisNode);
}
else
{
int sucNum = successorList->getSize();
notifyResponse->setSucNum(sucNum);
notifyResponse->setSucNodeArraySize(sucNum);
notifyResponse->setSrcNode(thisNode);
// can't accept the notify sender as predecessor,
// tell it about my correct predecessor
for (int k = 0; k < sucNum; k++)
{
notifyResponse->setSucNode(k, successorList->getSuccessor(k));
}
}
notifyResponse->setSrc(thisNode);
notifyResponse->setDest(call->getSrc());
// notifyResponse->setOverlay(UPPER_OVERLAY);
notifyResponse->setMesg_type(NOTIFY_RESPONSE);
notifyResponse->setLength(HNOTIFYRESPONSE_L(notifyResponse));
sendMessageToUDP(call->getSrc(), notifyResponse);
delete call;
}
void HChord_L::handleNotifyResponse(HNotifyResponse* notifyResponse)
{
if (successorList->getSuccessor() != notifyResponse->getSrc())
{
EV << "[HChord_L::handleRpcNotifyResponse() @ " << thisNode.ip
<< " (" << thisNode.key.toString(16) << ")]\n"
<< " The srcNode of the received NotifyResponse is not our "
<< " current successor"
<< endl;
delete notifyResponse;
return;
}
// if the NotifyResponse sender couldn't accept me as predecessor,