Examples with Membership org.apache.catalina.tribes.membership.Membership used on opensource projects

Example 1 with Membership

use of org.apache.catalina.tribes.membership.Membership in project tomcat70 by apache.

the class NonBlockingCoordinator method startElection.

// ============================================================================================================
// COORDINATION HANDLING
// ============================================================================================================
public void startElection(boolean force) throws ChannelException {
    synchronized (electionMutex) {
        MemberImpl local = (MemberImpl) getLocalMember(false);
        MemberImpl[] others = membership.getMembers();
        fireInterceptorEvent(new CoordinationEvent(CoordinationEvent.EVT_START_ELECT, this, "Election initiated"));
        if (others.length == 0) {
            this.viewId = new UniqueId(UUIDGenerator.randomUUID(false));
            this.view = new Membership(local, AbsoluteOrder.comp, true);
            this.handleViewConf(this.createElectionMsg(local, others, local), local, view);
            // the only member, no need for an election
            return;
        }
        if (suggestedviewId != null) {
            if (view != null && Arrays.diff(view, suggestedView, local).length == 0 && Arrays.diff(suggestedView, view, local).length == 0) {
                suggestedviewId = null;
                suggestedView = null;
                fireInterceptorEvent(new CoordinationEvent(CoordinationEvent.EVT_ELECT_ABANDONED, this, "Election abandoned, running election matches view"));
            } else {
                fireInterceptorEvent(new CoordinationEvent(CoordinationEvent.EVT_ELECT_ABANDONED, this, "Election abandoned, election running"));
            }
            // election already running, I'm not allowed to have two of them
            return;
        }
        if (view != null && Arrays.diff(view, membership, local).length == 0 && Arrays.diff(membership, view, local).length == 0) {
            fireInterceptorEvent(new CoordinationEvent(CoordinationEvent.EVT_ELECT_ABANDONED, this, "Election abandoned, view matches membership"));
            // already have this view installed
            return;
        }
        int prio = AbsoluteOrder.comp.compare(local, others[0]);
        // am I the leader in my view?
        MemberImpl leader = (prio < 0) ? local : others[0];
        if (local.equals(leader) || force) {
            CoordinationMessage msg = createElectionMsg(local, others, leader);
            suggestedviewId = msg.getId();
            suggestedView = new Membership(local, AbsoluteOrder.comp, true);
            Arrays.fill(suggestedView, msg.getMembers());
            fireInterceptorEvent(new CoordinationEvent(CoordinationEvent.EVT_PROCESS_ELECT, this, "Election, sending request"));
            sendElectionMsg(local, others[0], msg);
        } else {
            try {
                coordMsgReceived.set(false);
                fireInterceptorEvent(new CoordinationEvent(CoordinationEvent.EVT_WAIT_FOR_MSG, this, "Election, waiting for request"));
                electionMutex.wait(waitForCoordMsgTimeout);
            } catch (InterruptedException x) {
                Thread.interrupted();
            }
            if (suggestedviewId == null && (!coordMsgReceived.get())) {
                // no message arrived, send the coord msg
                // fireInterceptorEvent(new CoordinationEvent(CoordinationEvent.EVT_WAIT_FOR_MSG,this,"Election, waiting timed out."));
                // startElection(true);
                fireInterceptorEvent(new CoordinationEvent(CoordinationEvent.EVT_ELECT_ABANDONED, this, "Election abandoned, waiting timed out."));
            } else {
                fireInterceptorEvent(new CoordinationEvent(CoordinationEvent.EVT_ELECT_ABANDONED, this, "Election abandoned, received a message"));
            }
        }
    // end if
    }
}

Example 2 with Membership

use of org.apache.catalina.tribes.membership.Membership in project tomcat70 by apache.

the class NonBlockingCoordinator method handleViewConf.

protected void handleViewConf(CoordinationMessage msg, Member sender, Membership merged) throws ChannelException {
    // we already have this view
    if (viewId != null && msg.getId().equals(viewId))
        return;
    view = new Membership((MemberImpl) getLocalMember(false), AbsoluteOrder.comp, true);
    Arrays.fill(view, msg.getMembers());
    viewId = msg.getId();
    if (viewId.equals(suggestedviewId)) {
        suggestedView = null;
        suggestedviewId = null;
    }
    if (suggestedView != null && AbsoluteOrder.comp.compare(suggestedView.getMembers()[0], merged.getMembers()[0]) < 0) {
        suggestedView = null;
        suggestedviewId = null;
    }
    viewChange(viewId, view.getMembers());
    fireInterceptorEvent(new CoordinationEvent(CoordinationEvent.EVT_CONF_RX, this, "Accepted View"));
    if (suggestedviewId == null && hasHigherPriority(merged.getMembers(), membership.getMembers())) {
        startElection(false);
    }
}

Example 3 with Membership

use of org.apache.catalina.tribes.membership.Membership in project tomcat70 by apache.

the class NonBlockingCoordinator method handleMyToken.

protected void handleMyToken(MemberImpl local, CoordinationMessage msg, Member sender, Membership merged) throws ChannelException {
    if (local.equals(msg.getLeader())) {
        // no leadership change
        if (Arrays.sameMembers(msg.getMembers(), merged.getMembers())) {
            msg.type = COORD_CONF;
            super.sendMessage(Arrays.remove(msg.getMembers(), local), createData(msg, local), null);
            handleViewConf(msg, local, merged);
        } else {
            // membership change
            suggestedView = new Membership(local, AbsoluteOrder.comp, true);
            suggestedviewId = msg.getId();
            Arrays.fill(suggestedView, merged.getMembers());
            msg.view = merged.getMembers();
            sendElectionMsgToNextInline(local, msg);
        }
    } else {
        // leadership change
        suggestedView = null;
        suggestedviewId = null;
        msg.view = merged.getMembers();
        sendElectionMsgToNextInline(local, msg);
    }
}

Example 4 with Membership

use of org.apache.catalina.tribes.membership.Membership in project tomcat70 by apache.

the class NonBlockingCoordinator method createElectionMsg.

private CoordinationMessage createElectionMsg(MemberImpl local, MemberImpl[] others, MemberImpl leader) {
    Membership m = new Membership(local, AbsoluteOrder.comp, true);
    Arrays.fill(m, others);
    MemberImpl[] mbrs = m.getMembers();
    m.reset();
    CoordinationMessage msg = new CoordinationMessage(leader, local, mbrs, new UniqueId(UUIDGenerator.randomUUID(true)), COORD_REQUEST);
    return msg;
}

Example 5 with Membership

use of org.apache.catalina.tribes.membership.Membership in project tomcat70 by apache.

the class NonBlockingCoordinator method processCoordMessage.

protected void processCoordMessage(CoordinationMessage msg, Member sender) throws ChannelException {
    if (!coordMsgReceived.get()) {
        coordMsgReceived.set(true);
        synchronized (electionMutex) {
            electionMutex.notifyAll();
        }
    }
    msg.timestamp = System.currentTimeMillis();
    Membership merged = mergeOnArrive(msg, sender);
    if (isViewConf(msg))
        handleViewConf(msg, sender, merged);
    else
        handleToken(msg, sender, merged);
}