add ghosts update skip flag for custom operators.

hysop/operator/base/custom.py

@@ -28,42 +28,21 @@ from hysop.core.graph.graph import op_apply
 class CustomOperatorBase:
 
     @debug
-    def __new__(
-        cls,
-        func,
-        invars=None,
-        outvars=None,
-        extra_args=None,
-        variables=None,
-        ghosts=None,
-        **kwds,
-    ):
-        return super().__new__(
-            cls,
-            input_fields=None,
-            output_fields=None,
-            input_params=None,
-            output_params=None,
-            **kwds,
-        )
+    def __new__(cls, func, invars=None, outvars=None,
+                extra_args=None, variables=None, ghosts=None,
+                do_update_ghosts=True, **kwds):
+        return super().__new__(cls,
+                               input_fields=None, output_fields=None,
+                               input_params=None, output_params=None,
+                               **kwds)
 
     @debug
-    def __init__(
-        self,
-        func,
-        invars=None,
-        outvars=None,
-        extra_args=None,
-        variables=None,
-        ghosts=None,
-        **kwds,
-    ):
-        check_instance(
-            invars, (tuple, list), values=(Field, Parameter), allow_none=True
-        )
-        check_instance(
-            outvars, (tuple, list), values=(Field, Parameter), allow_none=True
-        )
+    def __init__(self, func, invars=None, outvars=None,
+                 extra_args=None, variables=None, ghosts=None, do_update_ghosts=True, **kwds):
+        check_instance(invars, (tuple, list), values=(Field, Parameter),
+                       allow_none=True)
+        check_instance(outvars, (tuple, list), values=(Field, Parameter),
+                       allow_none=True)
         check_instance(extra_args, tuple, allow_none=True)
         check_instance(
             variables,
@@ -73,6 +52,7 @@ class CustomOperatorBase:
             allow_none=True,
         )
         check_instance(ghosts, int, allow_none=True)
+        check_instance(do_update_ghosts, bool,)
         input_fields, output_fields = {}, {}
         input_params, output_params = {}, {}
         if invars is not None:
@@ -93,6 +73,7 @@ class CustomOperatorBase:
         if not extra_args is None:
             self.extra_args = extra_args
         self._ghosts = ghosts
+        self._do_update_ghosts = do_update_ghosts
         super().__init__(
             input_fields=input_fields,
             output_fields=output_fields,
@@ -138,7 +119,7 @@ class CustomOperatorBase:
                         for vd in self.output_discrete_fields[_v]:
                             doutvar.append(vd)
                         gh = self.output_discrete_fields[_v].build_ghost_exchanger()
-                        if gh is not None:
+                        if gh is not None and self._do_update_ghosts:
                             self.ghost_exchanger.append(gh)
                 elif isinstance(v, Parameter):
                     doutparam.append(v)