code: protected synchronized void join(SIXAResource resource)
     {
        if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled()) SibTr.entry(this, tc, "join", resource);
        resourcesJoinedToThisResource.add(resource);
        if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled()) SibTr.exit(this, tc, "join");
     }
docs: Called when another XAResource is joining to us.
  @param resource