private void askWhoIsTheLeader() {
logger.info("Node " + conf.getNodeId() + " is searching for the leader");
MgmtHeader.Builder mhb = MgmtHeader.newBuilder();
mhb.setOriginator(conf.getNodeId());
mhb.setTime(System.currentTimeMillis());
mhb.setSecurityCode(-999); // TODO add security
VectorClock.Builder rpb = VectorClock.newBuilder();
rpb.setNodeId(conf.getNodeId());
rpb.setTime(mhb.getTime());
rpb.setVersion(termId);
mhb.addPath(rpb);
LeaderElection.Builder elb = LeaderElection.newBuilder();
elb.setTermId(termId);
elb.setLastLogIndex(lastLogIndex);
elb.setAction(ElectAction.WHOISTHELEADER);
elb.setDesc("Node " + this.leaderNode + " is asking who the leader is");
elb.setCandidateId(-1);
elb.setExpires(-1);
Management.Builder mb = Management.newBuilder();
mb.setHeader(mhb.build());
mb.setElection(elb.build());
// now send it to the requester
ConnectionManager.broadcast(mb.build());
}
// gives back the current leader if the node is aware of who the leader is // else responds I do
// not know who the leader is/
private void respondToWhoIsTheLeader(Management mgmt) {
if (this.leaderNode == null) {
logger.info("----> I cannot respond to who the leader is! I don't know!");
return;
}
logger.info(
"Node "
+ conf.getNodeId()
+ " is replying to "
+ mgmt.getHeader().getOriginator()
+ "'s request who the leader is. Its Node "
+ this.leaderNode);
MgmtHeader.Builder mhb = MgmtHeader.newBuilder();
mhb.setOriginator(conf.getNodeId());
mhb.setTime(System.currentTimeMillis());
mhb.setSecurityCode(-999);
VectorClock.Builder rpb = VectorClock.newBuilder();
rpb.setNodeId(conf.getNodeId());
rpb.setTime(mhb.getTime());
rpb.setVersion(termId);
mhb.addPath(rpb);
LeaderElection.Builder elb = LeaderElection.newBuilder();
elb.setTermId(termId);
elb.setLastLogIndex(lastLogIndex);
elb.setAction(ElectAction.THELEADERIS);
elb.setDesc("Node " + this.leaderNode + " is the leader");
elb.setCandidateId(this.leaderNode);
elb.setExpires(-1);
Management.Builder mb = Management.newBuilder();
mb.setHeader(mhb.build());
mb.setElection(elb.build());
// now send it to the requester
try {
ConnectionManager.getConnection(mgmt.getHeader().getOriginator(), true).write(mb.build());
} catch (Exception ex) {
ex.printStackTrace();
}
}
/**
* initiate an election from within the server - most likely scenario is the heart beat manager
* detects a failure of the leader and calls this method.
*
* <p>Depending upon the algo. used (bully, flood, lcr, hs) the manager.startElection() will
* create the algo class instance and forward processing to it. If there was an election in
* progress and the election ID is not the same, the new election will supplant the current
* (older) election. This should only be triggered from nodes that share an edge with the leader.
*/
public void startElection() {
System.out.println("Inside start election");
this.state = RState.Candidate;
this.termId = electionInstance().createTermId();
LeaderElection.Builder elb = LeaderElection.newBuilder();
elb.setTermId(this.termId);
elb.setLastLogIndex(this.lastLogIndex);
elb.setAction(ElectAction.DECLAREELECTION);
elb.setDesc("Node " + conf.getNodeId() + " detects no leader. Election!");
elb.setCandidateId(conf.getNodeId()); // promote self
elb.setExpires(2 * 60 * 1000 + System.currentTimeMillis()); // 1 minute
// bias the voting with my number of votes (for algos that use vote
// counting)
// TODO use voting int votes = conf.getNumberOfElectionVotes();
MgmtHeader.Builder mhb = MgmtHeader.newBuilder();
mhb.setOriginator(conf.getNodeId());
mhb.setTime(System.currentTimeMillis());
mhb.setSecurityCode(-999); // TODO add security
VectorClock.Builder rpb = VectorClock.newBuilder();
rpb.setNodeId(conf.getNodeId());
rpb.setTime(mhb.getTime());
rpb.setVersion(termId);
mhb.addPath(rpb);
Management.Builder mb = Management.newBuilder();
mb.setHeader(mhb.build());
mb.setElection(elb.build());
// now send it out to all my edges
logger.info("Election started by node " + conf.getNodeId());
ConnectionManager.broadcast(mb.build());
}
