add HasScanMetadataExclusive: same as HasScanMetadata, but indicates that...

add HasScanMetadataExclusive: same as HasScanMetadata, but indicates that metadata is only useful when the controller is involved in a scan

bliss/common/protocols.py

@@ -165,3 +165,7 @@ class HasMetadataForScan(ABC):
             return self.name
         except AttributeError:
             return None
+
+
+class HasMetadataForScanExclusive(HasMetadataForScan):
+    pass

bliss/controllers/lima/lima_base.py

@@ -15,7 +15,7 @@ from bliss.common.tango import DeviceProxy, DevFailed, Database, DevState
 from bliss.config import settings
 from bliss.config.beacon_object import BeaconObject
 from bliss.common.logtools import log_debug
-from bliss.common.protocols import HasMetadataForScan
+from bliss.common.protocols import HasMetadataForScanExclusive
 
 from bliss.controllers.counter import CounterController, counter_namespace
 from bliss import current_session
@@ -81,7 +81,7 @@ class ChangeTangoTimeout(object):
         self.__device.set_timeout_millis(self.__back_timeout)
 
 
-class Lima(CounterController, HasMetadataForScan):
+class Lima(CounterController, HasMetadataForScanExclusive):
     """
     Lima controller.
     Basic configuration:

bliss/controllers/mca/base.py

@@ -22,7 +22,7 @@ import gevent
 from bliss import global_map
 from bliss.controllers.mca.roi import RoiConfig
 from bliss.common.logtools import log_debug
-from bliss.common.protocols import HasMetadataForScan
+from bliss.common.protocols import HasMetadataForScanExclusive
 from bliss.common.utils import autocomplete_property
 from bliss.config.beacon_object import BeaconObject
 from bliss.controllers.counter import CounterController
@@ -98,7 +98,7 @@ class MCABeaconObject(BeaconObject):
 
 
 # Base class
-class BaseMCA(CounterController, HasMetadataForScan):
+class BaseMCA(CounterController, HasMetadataForScanExclusive):
     """Generic MCA controller."""
 
     # Life cycle

bliss/scanning/scan_meta.py

@@ -18,7 +18,7 @@ import pprint
 import weakref
 
 from bliss import global_map
-from bliss.common.protocols import HasMetadataForScan
+from bliss.common.protocols import HasMetadataForScan, HasMetadataForScanExclusive
 from bliss.common.logtools import user_warning
 
 
@@ -140,6 +140,9 @@ def get_controllers_scan_meta(filtered_names=None):
 
     for obj in global_map.instance_iter("controllers"):
         if isinstance(obj, HasMetadataForScan):
+            if isinstance(obj, HasMetadataForScanExclusive):
+                # metadata for this controller has to be gathered by acq. chain
+                continue
             if not obj.scan_metadata_enabled:
                 continue
             if filtered_names and obj.scan_metadata_name in filtered_names: