docs: @Override
      public byte[] getGlobalId() {
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
              Tr.entry(tc, "getGlobalId");
  
          byte[] globalId = null;
  
          final TransactionImpl tran = ((TranManagerSet) TransactionManagerFactory.getTransactionManager()).getTransactionImpl();
  
          if (tran != null) {
              globalId = tran.getTID();
          }
  
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
              Tr.exit(tc, "getGlobalId", globalId);
          return globalId;
      }