more support on memory_backend and storage

Parts of ensuring these can be used independently for testing.
dwhswenson · Mar 1, 2021 · Feb 25, 2021 · Feb 26, 2021 · Feb 26, 2021 · Feb 26, 2021
commit 151b3a688d2a0f8d56d5b766890e5e911827d136
diff --git a/openpathsampling/experimental/simstore/__init__.py b/openpathsampling/experimental/simstore/__init__.py
@@ -4,6 +4,7 @@
 )
 from .class_info import ClassInfoContainer, ClassInfo
 from .sql_backend import SQLStorageBackend
+from .memory_backend import MemoryStorageBackend
 from . import dict_serialization_helpers
 from .storable_functions import (
     Processor, StorableFunctionConfig, StorableFunctionResults,

diff --git a/openpathsampling/experimental/simstore/memory_backend.py b/openpathsampling/experimental/simstore/memory_backend.py
@@ -79,9 +79,16 @@ def __init__(self, mode='w'):
         self.uuid_table = {}  # maps UUID to table name
         self._table_to_class = {}
 
+    @property
+    def identifier(self):
+        return hex(id(self))
+
     def close(self):
         pass  # no such thing as closing here, but may be needed for API
 
+    def register_type(self, type_str, backend_type):
+        pass  # no need to do anything here?
+
     def register_schema(self, schema, table_to_class, metadata=None):
         for table_name, schema_entries in schema.items():
             logger.debug("Registering table: %s" % table_name)

diff --git a/openpathsampling/experimental/simstore/storage.py b/openpathsampling/experimental/simstore/storage.py
@@ -138,6 +138,10 @@ def _load_missing_info_tables(self, table_to_class):
             raise RuntimeError("Unable to register existing database "
                                + "tables: " + str(missing_info_tables))
 
+    def register_from_tables(self, table_names, classes):
+        # override in subclass to handle special lookups
+        pass
+
     def stash(self, objects):
         objects = tools.listify(objects)
         self._stashed.extend(objects)