Examples with Joiner com.google_voltpatches.common.base.Joiner used on opensource projects

Example 1 with Joiner

use of com.google_voltpatches.common.base.Joiner in project voltdb by VoltDB.

the class MeshProber method considerMeshPlea.

@Override
public JoinAcceptor.PleaDecision considerMeshPlea(ZooKeeper zk, int hostId, JSONObject jo) {
    checkArgument(zk != null, "zookeeper is null");
    checkArgument(jo != null, "json object is null");
    if (!HostCriteria.hasCriteria(jo)) {
        return new JoinAcceptor.PleaDecision(String.format("Joining node version %s is incompatible with this node verion %s", jo.optString(SocketJoiner.VERSION_STRING, "(unknown)"), m_versionChecker.getVersionString()), false, false);
    }
    HostCriteria hc = new HostCriteria(jo);
    Map<Integer, HostCriteria> hostCriteria = m_hostCriteria.get();
    // when the cluster is forming anew)
    if (!getNodeState().operational() && !hostCriteria.values().stream().anyMatch(c -> c.getNodeState().operational())) {
        List<String> incompatibilities = asHostCriteria().listIncompatibilities(hc);
        if (!incompatibilities.isEmpty()) {
            Joiner joiner = Joiner.on("\n    ").skipNulls();
            String error = "Incompatible joining criteria:\n    " + joiner.join(incompatibilities);
            return new JoinAcceptor.PleaDecision(error, false, false);
        }
        return new JoinAcceptor.PleaDecision(null, true, false);
    } else {
        StartAction operationalStartAction = hostCriteria.values().stream().filter(c -> c.getNodeState().operational()).map(c -> c.getStartAction()).findFirst().orElse(getStartAction());
        if (operationalStartAction == StartAction.PROBE && hc.getStartAction() != StartAction.PROBE) {
            String msg = "Invalid VoltDB command. Please use init and start to join this cluster";
            return new JoinAcceptor.PleaDecision(msg, false, false);
        }
    }
    // how many hosts are already in the mesh?
    Stat stat = new Stat();
    try {
        zk.getChildren(CoreZK.hosts, false, stat);
    } catch (InterruptedException e) {
        String msg = "Interrupted while considering mesh plea";
        m_networkLog.error(msg, e);
        return new JoinAcceptor.PleaDecision(msg, false, false);
    } catch (KeeperException e) {
        EnumSet<KeeperException.Code> closing = EnumSet.of(KeeperException.Code.SESSIONEXPIRED, KeeperException.Code.CONNECTIONLOSS);
        if (closing.contains(e.code())) {
            return new JoinAcceptor.PleaDecision("Shutting down", false, false);
        } else {
            String msg = "Failed to list hosts while considering a mesh plea";
            m_networkLog.error(msg, e);
            return new JoinAcceptor.PleaDecision(msg, false, false);
        }
    }
    // connecting to already wholly formed cluster
    if (stat.getNumChildren() >= getHostCount()) {
        return new JoinAcceptor.PleaDecision(hc.isAddAllowed() ? null : "Cluster is already complete", hc.isAddAllowed(), false);
    } else if (stat.getNumChildren() < getHostCount()) {
        // check for concurrent rejoins
        final int rejoiningHost = CoreZK.createRejoinNodeIndicator(zk, hostId);
        if (rejoiningHost == -1) {
            return new JoinAcceptor.PleaDecision(null, true, false);
        } else {
            String msg = "Only one host can rejoin at a time. Host " + rejoiningHost + " is still rejoining.";
            return new JoinAcceptor.PleaDecision(msg, false, true);
        }
    }
    return new JoinAcceptor.PleaDecision(null, true, false);
}