/// <summary> Runs the merge protocol as a leader</summary>
public virtual void Run()
{
MergeData combined_merge_data = null;
if (Enclosing_Instance.merging == true)
{
Enclosing_Instance.gms.Stack.NCacheLog.Warn("CoordGmsImpl.Run()", "merge is already in progress, terminating");
return;
}
Enclosing_Instance.gms.Stack.NCacheLog.Debug("CoordGmsImpl.Run()", "merge task started");
try
{
/* 1. Generate a merge_id that uniquely identifies the merge in progress */
Enclosing_Instance.merge_id = Enclosing_Instance.generateMergeId();
/* 2. Fetch the current Views/Digests from all subgroup coordinators */
Enclosing_Instance.getMergeDataFromSubgroupCoordinators(coords, Enclosing_Instance.gms.merge_timeout);
/* 3. Remove rejected MergeData elements from merge_rsp and coords (so we'll send the new view only
to members who accepted the merge request) */
Enclosing_Instance.removeRejectedMergeRequests(coords);
if (Enclosing_Instance.merge_rsps.Count <= 1)
{
Enclosing_Instance.gms.Stack.NCacheLog.Warn("CoordGmsImpl.Run()", "merge responses from subgroup coordinators <= 1 (" + Global.CollectionToString(Enclosing_Instance.merge_rsps) + "). Cancelling merge");
Enclosing_Instance.sendMergeCancelledMessage(coords, Enclosing_Instance.merge_id);
return;
}
/* 4. Combine all views and digests into 1 View/1 Digest */
combined_merge_data = Enclosing_Instance.consolidateMergeData(Enclosing_Instance.merge_rsps);
if (combined_merge_data == null)
{
Enclosing_Instance.gms.Stack.NCacheLog.Error("CoordGmsImpl.Run()", "combined_merge_data == null");
Enclosing_Instance.sendMergeCancelledMessage(coords, Enclosing_Instance.merge_id);
return;
}
/* 5. Send the new View/Digest to all coordinators (including myself). On reception, they will
install the digest and view in all of their subgroup members */
Enclosing_Instance.sendMergeView(coords, combined_merge_data);
}
catch (System.Exception ex)
{
Enclosing_Instance.gms.Stack.NCacheLog.Error("MergeTask.Run()", ex.ToString());
}
finally
{
Enclosing_Instance.merging = false;
Enclosing_Instance.gms.Stack.NCacheLog.Debug("CoordGmsImpl.Run()", "merge task terminated");
t = null;
}
}
internal System.Collections.ArrayList coords = null; // list of subgroup coordinators to be contacted
public virtual void start(System.Collections.ArrayList coords)
{
if (t == null)
{
this.coords = coords;
t = new ThreadClass(new System.Threading.ThreadStart(this.Run), "MergeTask thread");
t.IsBackground = true;
t.Start();
}
}
public virtual void stop()
{
ThreadClass tmp = t;
if (Running)
{
t = null;
tmp.Interrupt();
}
t = null;
coords = null;
}
/// <summary>
/// Gets the currently running thread
/// </summary>
/// <returns>The currently running thread</returns>
public static ThreadClass Current()
{
ThreadClass CurrentThread = new ThreadClass();
CurrentThread.threadField = Thread.CurrentThread;
return CurrentThread;
}
