/// <summary> Sets the new view and sends a VIEW_CHANGE event up and down the stack.</summary>
public virtual void installView(View new_view)
{
Stack.NCacheLog.CriticalInfo("GMS.InstallView", "Installing new View " + local_addr.ToString() + " --> " + new_view);
Address coord = null;
try
{
//Lest inform coordinator about view receiption
SendViewAcknowledgment(new_view.Coordinator);
int rc;
ViewId vid = new_view.Vid;
System.Collections.ArrayList mbrs = new_view.Members;
impl.UniqueId = new_view.BridgeSourceCacheId;
_uniqueID = new_view.BridgeSourceCacheId;
if (Stack.NCacheLog.IsInfoEnabled) Stack.NCacheLog.Info("[local_addr=" + local_addr + "] view is " + new_view);
// 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)
{
Stack.NCacheLog.Error("[" + local_addr + "] received view <= current view;" + " discarding it (current vid: " + view_id + ", new vid: " + vid + ')');
Event viewEvt = new Event(Event.VIEW_CHANGE_OK, null, Priority.Critical);
passDown(viewEvt);
return;
}
Address currentCoodinator = determineCoordinator();
Address newCoordinator = new_view.Coordinator;
Address sender = vid.CoordAddress; // creater of the view
if (!currentCoodinator.Equals(newCoordinator) && !newCoordinator.Equals(local_addr) && !sender.Equals(currentCoodinator))
{
Stack.NCacheLog.CriticalInfo("GMS.InstallView", "Force Join Cluster");
if (!new_view.ForceInstall)
{
if (!VerifySuspect(currentCoodinator))
{
Stack.NCacheLog.Error("GMS.installView", "rejecting the view from " + newCoordinator + " as my own coordinator[" + currentCoodinator + "] is not down");
Event viewEvt = new Event(Event.VIEW_CHANGE_OK, null, Priority.Critical);
passDown(viewEvt);
//we should inform the coordinator of this view that i can't be the member
//of your view as my own coordinator is alive.
Message msg = new Message(new_view.Coordinator, null, new byte[0]);
msg.putHeader(HeaderType.GMS, new GMS.HDR(GMS.HDR.VIEW_REJECTED, local_addr));
passDown(new Event(Event.MSG, msg, Priority.Critical));
return;
}
}
}
}
ltime = System.Math.Max(vid.Id, 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 (checkSelfInclusion(mbrs) == false)
{
Stack.NCacheLog.Error("GMS.InstallView", "CheckSelfInclusion() failed, " + local_addr + " is not a member of view " + new_view + "; discarding view");
// only shun if this member was previously part of the group. avoids problem where multiple
// members (e.g. X,Y,Z) join {A,B} concurrently, X is joined first, and Y and Z get view
// {A,B,X}, which would cause Y and Z to be shunned as they are not part of the membership
// bela Nov 20 2003
if (shun && local_addr != null && prev_members.contains(local_addr))
{
Stack.NCacheLog.CriticalInfo("I (" + local_addr + ") am being shunned, will leave and " + "rejoin group (prev_members are " + prev_members + ')');
passUp(new Event(Event.EXIT));
}
return;
}
lock (members)
{
//@UH Members are same as in the previous view. No need to apply view
if (view_id != null)
{
Membership newMembers = new Membership(mbrs);
if (members.Equals(newMembers) && vid.CoordAddress.Equals(view_id.CoordAddress))
{
Stack.NCacheLog.Error("GMS.InstallView", "[" + local_addr + "] received view has the same members as current view;" + " discarding it (current vid: " + view_id + ", new vid: " + vid + ')');
Event viewEvt = new Event(Event.VIEW_CHANGE_OK, null, Priority.Critical);
//#usama@15-4-2013 joining, leaving and tmp_members are needed to be synchronized even if view is same
Global.ICollectionSupport.RemoveAll(joining, mbrs); // remove all members in mbrs from joining
// remove all elements from 'leaving' that are not in 'mbrs'
Global.ICollectionSupport.RetainAll(leaving, mbrs);
tmp_members.add(joining); // add members that haven't yet shown up in the membership
tmp_members.remove(leaving); // remove members that haven't yet been removed from the membership
passDown(viewEvt);
return;
}
}
//=========================================
//
Stack.NCacheLog.CriticalInfo("GMS.InstallView", "Installing view in gms");
if (Stack.NCacheLog.IsInfoEnabled) Stack.NCacheLog.Info("GMS.InstallView " + new_view.ToString() + "\\n" + "seq tble : " + new_view.SequencerTbl.Count);
this._subGroupMbrsMap = new_view.SequencerTbl.Clone() as System.Collections.Hashtable;
this._mbrSubGroupMap = new_view.MbrsSubgroupMap.Clone() as System.Collections.Hashtable;
//=========================================
// serialize access to views
// assign new_view to view_id
view_id = vid.Copy();
Stack.NCacheLog.CriticalInfo("GMS.InstallView", "=== View ID = " + view_id.ToString());
// Set the membership. Take into account joining members
if (mbrs != null && mbrs.Count > 0)
{
for (int i = 0; i < members.size(); i++)
{
Address mbr = members.elementAt(i);
if (!mbrs.Contains(mbr))
RemoveGmsId(mbr);
}
Hashtable gmsIds = new_view.GmsIds;
if (gmsIds != null)
{
IDictionaryEnumerator ide = gmsIds.GetEnumerator();
while (ide.MoveNext())
{
if(Stack.NCacheLog.IsInfoEnabled) Stack.NCacheLog.Info("GMS.InstallView", "mbr = " + ide.Key + " ; gms_id = " + ide.Value);
AddGmsId((Address)ide.Key, (string)ide.Value);
}
}
for (int i = 0; i < mbrs.Count; i++)
{
Stack.NCacheLog.CriticalInfo("GMS.InstallView", "Members.set = " + mbrs[i] != null ? mbrs[i].ToString() : null);
}
members.set(mbrs);
tmp_members.set(members);
Global.ICollectionSupport.RemoveAll(joining, mbrs); // remove all members in mbrs from joining
// remove all elements from 'leaving' that are not in 'mbrs'
Global.ICollectionSupport.RetainAll(leaving, mbrs);
tmp_members.add(joining); // add members that haven't yet shown up in the membership
tmp_members.remove(leaving); // remove members that haven't yet been removed from the membership
// add to prev_members
for (System.Collections.IEnumerator it = mbrs.GetEnumerator(); it.MoveNext(); )
{
Address addr = (Address)it.Current;
if (!prev_members.contains(addr))
prev_members.add(addr);
}
}
// Send VIEW_CHANGE event up and down the stack:
if (Stack.NCacheLog.IsInfoEnabled) Stack.NCacheLog.Info("GMS.installView", "broadcasting view change within stack");
coord = determineCoordinator();
// changed on suggestion by yaronr and Nicolas Piedeloupe
if (coord != null && coord.Equals(local_addr) && !haveCoordinatorRole())
{
becomeCoordinator();
}
else
{
if (haveCoordinatorRole() && !local_addr.Equals(coord))
becomeParticipant();
}
if (string.IsNullOrEmpty(new_view.BridgeSourceCacheId))
new_view.BridgeSourceCacheId = impl.UniqueId;
MarkStateTransferInProcess();
Event view_event = new Event(Event.VIEW_CHANGE, new_view.Clone(), Priority.Critical);
passDown(view_event); // needed e.g. by failure detector or UDP
}
}
finally
{
}
}
