Improve loading speed of the database description

doc/news/describe-perfromance.rst

@@ -0,0 +1,3 @@
+**Performance:**
+
+* Improved speed to return the echemdb description by caching the bibliography data.

unitpackage/database/echemdb.py

@@ -149,24 +149,24 @@ def bibliography(self):
             ''
 
         """
-        from pybtex.database import BibliographyData
-
-        bib_data = BibliographyData(
-            {
-                entry.bibliography.key: entry.bibliography
-                for entry in self
-                if entry.bibliography
-            }
-        )
+        from pybtex.database import BibliographyData, parse_string
 
-        if isinstance(bib_data, str):
-            return bib_data
+        # Parse each unique bibdata string only once; many entries share a publication.
+        seen_citations = {}
+        for entry in self:
+            try:
+                citation = entry.source.bibdata
+            except AttributeError:
+                citation = ""
+            if citation and citation not in seen_citations:
+                seen_citations[citation] = parse_string(citation, "bibtex")
 
-        # Remove duplicates from the bibliography
-        bib_data_ = BibliographyData()
+        if not seen_citations:
+            return ""
 
-        for key, entry in bib_data.entries.items():
-            if key not in bib_data_.entries:
-                bib_data_.add_entry(key, entry)
+        bib_data_ = BibliographyData()
+        for parsed in seen_citations.values():
+            for key, bib_entry in parsed.entries.items():
+                bib_data_.add_entry(key, bib_entry)
 
         return bib_data_

unitpackage/database/echemdb_entry.py

@@ -65,6 +65,7 @@
 #  along with unitpackage. If not, see <https://www.gnu.org/licenses/>.
 # ********************************************************************
 import logging
+from functools import cached_property
 
 from unitpackage.entry import Entry
 
@@ -174,7 +175,7 @@ def from_mpt(cls, csvname, encoding=None):
 
         return entry
 
-    @property
+    @cached_property
     def bibliography(self):
         r"""
         Return a pybtex bibliography object associated with this entry.