@Override
public boolean setMembershipManager(MembershipManager mgr) {
if (services == null || services.isStopped()) {
logger.info("Peer locator is connecting to local membership services");
services = ((GMSMembershipManager) mgr).getServices();
localAddress = services.getMessenger().getMemberID();
services.setLocator(this);
NetView newView = services.getJoinLeave().getView();
if (newView != null) {
this.view = newView;
}
return true;
}
return false;
}
@Override
public Object processRequest(Object request) throws IOException {
Object response = null;
if (logger.isDebugEnabled()) {
logger.debug("Peer locator processing {}", request);
}
if (localAddress == null && services != null) {
localAddress = services.getMessenger().getMemberID();
}
if (request instanceof GetViewRequest) {
if (view != null) {
response = new GetViewResponse(view);
}
} else if (request instanceof FindCoordinatorRequest) {
FindCoordinatorRequest findRequest = (FindCoordinatorRequest) request;
if (findRequest.getMemberID() != null) {
InternalDistributedMember coord = null;
// at this level we want to return the coordinator known to membership services,
// which may be more up-to-date than the one known by the membership manager
if (view == null) {
findServices();
}
boolean fromView = false;
int viewId = -1;
NetView v = this.view;
if (v != null) {
// if the ID of the requester matches an entry in the membership view then remove
// that entry - it's obviously an old member since the ID has been reused
InternalDistributedMember rid = findRequest.getMemberID();
for (InternalDistributedMember id : v.getMembers()) {
if (rid.compareTo(id, false) == 0) {
NetView newView = new NetView(v, v.getViewId());
newView.remove(id);
v = newView;
break;
}
}
viewId = v.getViewId();
if (viewId > findRequest.getLastViewId()) {
// ignore the requests rejectedCoordinators if the view has changed
coord = v.getCoordinator(Collections.<InternalDistributedMember>emptyList());
} else {
coord = v.getCoordinator(findRequest.getRejectedCoordinators());
}
logger.debug("Peer locator: coordinator from view is {}", coord);
fromView = true;
}
if (coord == null) {
// find the "oldest" registrant
Collection<InternalDistributedMember> rejections = findRequest.getRejectedCoordinators();
if (rejections == null) {
rejections = Collections.emptyList();
}
synchronized (registrants) {
registrants.add(findRequest.getMemberID());
if (services != null) {
coord = services.getJoinLeave().getMemberID();
}
for (InternalDistributedMember mbr : registrants) {
if (mbr != coord && (coord == null || mbr.compareTo(coord) < 0)) {
if (!rejections.contains(mbr)
&& (mbr.getNetMember().preferredForCoordinator()
|| !mbr.getNetMember().splitBrainEnabled())) {
coord = mbr;
}
}
}
logger.debug("Peer locator: coordinator from registrations is {}", coord);
}
}
synchronized (registrants) {
response =
new FindCoordinatorResponse(
coord,
localAddress,
fromView,
view,
new HashSet<InternalDistributedMember>(registrants),
this.networkPartitionDetectionEnabled,
this.usePreferredCoordinators);
}
}
}
if (logger.isDebugEnabled()) {
logger.debug("Peer locator returning {}", response);
}
return response;
}
