From ae8991618927f81343038f235c3e3f76932f80ea Mon Sep 17 00:00:00 2001
From: Peter Amstutz
Date: Wed, 8 Jul 2020 16:17:09 -0400
Subject: Avoid redundant loading of schema

---
 bh20sequploader/qc_metadata.py | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/bh20sequploader/qc_metadata.py b/bh20sequploader/qc_metadata.py
index 3e1e471..0a0c780 100644
--- a/bh20sequploader/qc_metadata.py
+++ b/bh20sequploader/qc_metadata.py
@@ -8,15 +8,20 @@ import traceback
 from rdflib import Graph, Namespace
 from pyshex.evaluate import evaluate
 
+metadata_schema = None
 
 def qc_metadata(metadatafile):
+    global metadata_schema
     log = logging.getLogger(__name__ )
-    schema_resource = pkg_resources.resource_stream(__name__, "bh20seq-schema.yml")
-    cache = {"https://raw.githubusercontent.com/arvados/bh20-seq-resource/master/bh20sequploader/bh20seq-schema.yml": schema_resource.read().decode("utf-8")}
-    (document_loader,
-     avsc_names,
-     schema_metadata,
-     metaschema_loader) = schema_salad.schema.load_schema("https://raw.githubusercontent.com/arvados/bh20-seq-resource/master/bh20sequploader/bh20seq-schema.yml", cache=cache)
+    if metadata_schema is None:
+        schema_resource = pkg_resources.resource_stream(__name__, "bh20seq-schema.yml")
+        cache = {"https://raw.githubusercontent.com/arvados/bh20-seq-resource/master/bh20sequploader/bh20seq-schema.yml": schema_resource.read().decode("utf-8")}
+         metadata_schema = schema_salad.schema.load_schema("https://raw.githubusercontent.com/arvados/bh20-seq-resource/master/bh20sequploader/bh20seq-schema.yml", cache=cache)
+
+     (document_loader,
+      avsc_names,
+      schema_metadata,
+      metaschema_loader) = metadata_schema
 
     shex = pkg_resources.resource_stream(__name__, "bh20seq-shex.rdf").read().decode("utf-8")
 
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