/// <summary> If we are leaving, we have to wait for the view change (last msg in the current view) that
/// excludes us before we can leave.
/// </summary>
/// <param name="new_view">The view to be installed
/// </param>
/// <param name="digest"> If view is a MergeView, digest contains the seqno digest of all members and has to
/// be set by GMS
/// </param>
public override void handleViewChange(View new_view, Digest digest)
{
if (gms.Stack.NCacheLog.IsInfoEnabled)
{
gms.Stack.NCacheLog.Info("ParticipentGMSImpl.handleViewChange", "received view");
}
System.Collections.ArrayList mbrs = new_view.Members;
gms.Stack.NCacheLog.Debug("view=");// + new_view);
suspected_mbrs.Clear();
if (leaving && !mbrs.Contains(gms.local_addr))
{
// received a view in which I'm not member: ignore
return;
}
ViewId vid = gms.view_id != null?gms.view_id.Copy() : null;
if (vid != null)
{
int rc = vid.CompareTo(new_view.Vid);
if (rc < 0)
{
isNewMember = false;
if (gms.Stack.NCacheLog.IsInfoEnabled)
{
gms.Stack.NCacheLog.Info("ParticipantGmsImp", "isNewMember : " + isNewMember);
}
}
}
gms.installView(new_view, digest);
}
/// <summary>
/// Sets the new view and sends a VIEW_CHANGE event up and down the stack.
/// </summary>
/// <param name="new_view">New View to install</param>
public void installView(View new_view)
{
Address coord;
int rc;
ViewId vid = new_view.getVid();
ArrayList mbrs = new_view.getMembers();
lock (members)
{ // serialize access to views
ltime = Math.Max(vid.getId(), ltime); // compute Lamport logical time
/* Check for self-inclusion: if I'm not part of the new membership, I just discard it.
* This ensures that messages sent in view V1 are only received by members of V1 */
if (Trace.trace)
{
Trace.info("GMS.installView()", "View to install contains: " + new_view.ToString());
}
if (checkSelfInclusion(mbrs) == false)
{
if (Trace.trace)
{
Trace.warn("GMS.installView()",
"checkSelfInclusion() failed, not a member of view " + mbrs + "; discarding view");
}
if (shun)
{
if (Trace.trace)
{
Trace.warn("GMS.installView()", "I'm being shunned, will leave and rejoin group");
}
passUp(new Event(Event.EXIT));
}
return;
}
// Discards view with id lower than our own. Will be installed without check if first view
if (view_id != null)
{
rc = vid.CompareTo(view_id);
if (rc <= 0)
{
if (Trace.trace)
{
Trace.error("GMS.installView()", "received view <= current view;" +
" discarding it ! (current vid: " + view_id + ", new vid: " + vid + ")");
}
return;
}
}
if (Trace.trace)
{
Trace.info("GMS.installView()", "view is " + new_view);
}
// assign new_view to view_id
view_id = vid.Copy();
// Set the membership. Take into account joining members
if (mbrs != null && mbrs.Count > 0)
{
members.set(mbrs);
tmp_members.set(members);
foreach (Object obj in mbrs)
{
joining.Remove(obj); // remove all members in mbrs from joining
}
tmp_members.add(joining); // adjust temporary membership
}
// Send VIEW_CHANGE event up and down the stack:
Event view_event = new Event(Event.VIEW_CHANGE, (View)new_view.copy());
passDown(view_event); // needed e.g. by failure detector or UDP
passUp(view_event);
coord = determineCoordinator();
if (coord != null && coord.Equals(local_addr) && !(coord.Equals(vid.getCoordAddress())))
{
becomeCoordinator();
}
else
{
if (haveCoordinatorRole() && !local_addr.Equals(coord))
{
becomeParticipant();
}
}
}
}