/**
* Called by join(). Installs the view returned by calling Coord.handleJoin() and becomes
* coordinator.
*/
private boolean installView(View new_view) {
Vector mems = new_view.getMembers();
if (log.isDebugEnabled()) log.debug("new_view=" + new_view);
if (gms.local_addr == null || mems == null || !mems.contains(gms.local_addr)) {
if (log.isErrorEnabled())
log.error(
"I (" + gms.local_addr + ") am not member of " + mems + ", will not install view");
return false;
}
gms.installView(new_view);
gms.becomeParticipant();
gms.passUp(new Event(Event.BECOME_SERVER));
gms.passDown(new Event(Event.BECOME_SERVER));
return true;
}
/**
* GemStoneAddition - new protocol to allow a member to assume the role of coordinator in a system
* that has lost all eligible coordinators
*
* @param mbr the address of this stack
* @param failedCoordinator (optional) the address of the coordinator that held the view
* @return true if able to become coordinator, false if not
*/
boolean becomeGroupCoordinator(Address mbr, Address failedCoordinator) {
int sentRequests = 0;
Digest initial_digest;
ViewId view_id;
Vector mbrs;
Vector imbrs;
synchronized (initial_mbrs) {
imbrs = (Vector) initial_mbrs.clone();
}
// get the current view from one of the members and then
// form a new group
GMS.GmsHeader hdr = new GMS.GmsHeader(GMS.GmsHeader.GET_VIEW);
for (int i = 0; i < imbrs.size(); i++) {
PingRsp rsp = (PingRsp) imbrs.get(i);
Message getView = new Message();
getView.setDest(rsp.getAddress());
getView.putHeader(GMS.name, hdr);
gms.passDown(new Event(Event.MSG, getView));
}
// wait up to ack-collection-time for responses
sentRequests = imbrs.size();
long endTime = System.currentTimeMillis() + gms.view_ack_collection_timeout;
while (true) {
synchronized (this.getViewLock) {
long timeLeft = endTime - System.currentTimeMillis();
if (this.getViewResponses >= sentRequests || timeLeft <= 0) {
break;
}
try {
this.getViewLock.wait(timeLeft);
} catch (InterruptedException ie) {
Thread.currentThread().interrupt();
throw gms.stack.gfBasicFunctions.getSystemConnectException(
ExternalStrings.ClientGmsImpl_INTERRUPTED_WHILE_BECOMING_COORDINATOR_OF_EXISTING_GROUP
.toLocalizedString());
}
}
}
if (this.getViewResponse == null) {
throw gms.stack.gfBasicFunctions.getSystemConnectException(
ExternalStrings
.ClientGmsImpl_UNABLE_TO_BECOME_COORDINATOR_OF_EXISTING_GROUP_BECAUSE_NO_VIEW_RESPONSES_WERE_RECEIVED
.toLocalizedString());
}
View theView = this.getViewResponse.getView();
Address theCreator = theView.getCreator();
if (theCreator != null && theCreator.preferredForCoordinator()) {
if (failedCoordinator == null && theView.containsMember(theCreator)) {
// locator was shut down and restarted. Other members reported no coordinator
// but now there is one, so two eligible coordinators are being started
// simultaneously. Return false to allow the other one to win
// log.getLogWriterI18n().info(JGroupsStrings.ONE_ARG, "DEBUG: failedCoordinator is
// null and view creator is "
// + theCreator);
return false;
}
if (failedCoordinator != null && !theCreator.equals(failedCoordinator)) {
// the locator or its machine failed and this is a new locator starting
// up. Another locator has already installed itself as the coordinator,
// so return false to let it win
// log.getLogWriterI18n().info(JGroupsStrings.ONE_ARG, "DEBUG: failedCoordinator is
// " + failedCoordinator + " and view creator is "
// + theCreator);
return false;
}
}
mbrs = theView.getMembers();
mbrs.add(
mbr); // add myself in (was .add(0, mbr) prior to 2013 cedar release but this caused elder
// init problems with colocated secure locators)
// create the initial digest. it will be filled in with gossip soon enough
initial_digest = this.getViewResponse.getDigest();
initial_digest.add(
gms.local_addr, 0, 0); // initial seqno mcast by me will be 1 (highest seen +1)
gms.setDigest(initial_digest);
view_id =
new ViewId(
mbr, theView.getVid().getId() + 1); // create singleton view with mbr as only member
View new_view = new View(view_id, mbrs);
gms.installView(new_view);
gms.becomeCoordinator(null); // not really necessary - installView() should do it
gms.ucastViewChange(new_view); // tell the world
gms.passUp(new Event(Event.BECOME_SERVER));
gms.passDown(new Event(Event.BECOME_SERVER));
gms.notifyOfCoordinator(gms.local_addr);
log.getLogWriter()
.info(ExternalStrings.ClientGmsImpl_RECREATED_DISTRIBUTED_SYSTEM_GROUP_0, gms.view);
return true;
}
