/** @return the ZooKeeper path used for leadership election by Curator */
private String buildLeaderPath() {
String ns = StringUtils.hasText(namespace) ? namespace : DEFAULT_NAMESPACE;
if (!ns.startsWith("/")) {
ns = "/" + ns;
}
if (!ns.endsWith("/")) {
ns = ns + "/";
}
return String.format(ns + "%s", candidate.getRole());
}
/** Start the registration of the {@link #candidate} for leader election. */
@Override
public synchronized void start() {
if (!running) {
if (client.getState() != CuratorFrameworkState.STARTED) {
// we want to do curator start here because it needs to
// be started before leader selector and it gets a little
// complicated to control ordering via beans so that
// curator is fully started.
client.start();
}
leaderSelector = new LeaderSelector(client, buildLeaderPath(), new LeaderListener());
leaderSelector.setId(candidate.getId());
leaderSelector.autoRequeue();
leaderSelector.start();
running = true;
}
}