From 010f8cd42a97ba869abed521025d12c05b7d2b29 Mon Sep 17 00:00:00 2001
From: Bill Hlavacek <hlavacek@lanl.gov>
Date: Mon, 11 May 2026 14:23:37 -0600
Subject: [PATCH 1/2] Add cached app/config accessors in bionetgen.main

---
 bionetgen/main.py            | 20 ++++++++++++++++
 tests/test_main_accessors.py | 45 ++++++++++++++++++++++++++++++++++++
 2 files changed, 65 insertions(+)
 create mode 100644 tests/test_main_accessors.py

diff --git a/bionetgen/main.py b/bionetgen/main.py
index 2d8be05d..56fbbeee 100644
--- a/bionetgen/main.py
+++ b/bionetgen/main.py
@@ -1,3 +1,5 @@
+import functools
+
 import cement
 import bionetgen as bng
 from cement.core.exc import CaughtSignal
@@ -625,6 +627,24 @@ class Meta:
         label = "bionetgen"
 
 
+@functools.cache
+def get_default_app():
+    """Return a configured BioNetGen cement app, initialized once per process."""
+    app = BioNetGen()
+    app.setup()
+    return app
+
+
+def get_conf():
+    """Return the bionetgen config section from the shared app."""
+    return get_default_app().config["bionetgen"]
+
+
+def get_default_bng_path():
+    """Return the default BNG2.pl path from config."""
+    return get_conf()["bngpath"]
+
+
 def main():
     with BioNetGen() as app:
         try:
diff --git a/tests/test_main_accessors.py b/tests/test_main_accessors.py
new file mode 100644
index 00000000..73aa17f8
--- /dev/null
+++ b/tests/test_main_accessors.py
@@ -0,0 +1,45 @@
+from unittest.mock import MagicMock, patch
+
+
+def test_get_default_app_is_cached():
+    from bionetgen import main as main_module
+
+    main_module.get_default_app.cache_clear()
+    fake_app = MagicMock()
+
+    with patch.object(main_module, "BioNetGen", return_value=fake_app) as mock_app_cls:
+        app1 = main_module.get_default_app()
+        app2 = main_module.get_default_app()
+
+    assert app1 is fake_app
+    assert app2 is fake_app
+    mock_app_cls.assert_called_once_with()
+    fake_app.setup.assert_called_once_with()
+    main_module.get_default_app.cache_clear()
+
+
+def test_get_conf_uses_cached_default_app():
+    from bionetgen import main as main_module
+
+    main_module.get_default_app.cache_clear()
+    fake_app = MagicMock()
+    fake_app.config = {"bionetgen": {"bngpath": "/fake/BNG2.pl", "other": "value"}}
+
+    with patch.object(main_module, "BioNetGen", return_value=fake_app) as mock_app_cls:
+        conf1 = main_module.get_conf()
+        conf2 = main_module.get_conf()
+
+    assert conf1 == {"bngpath": "/fake/BNG2.pl", "other": "value"}
+    assert conf2 is conf1
+    mock_app_cls.assert_called_once_with()
+    fake_app.setup.assert_called_once_with()
+    main_module.get_default_app.cache_clear()
+
+
+def test_get_default_bng_path_reads_bngpath_from_config():
+    from bionetgen import main as main_module
+
+    with patch.object(
+        main_module, "get_conf", return_value={"bngpath": "/tmp/BNG2.pl"}
+    ):
+        assert main_module.get_default_bng_path() == "/tmp/BNG2.pl"

From cdf979ef0950fb10dd44b346e302d40ed5f1219c Mon Sep 17 00:00:00 2001
From: Bill Hlavacek <hlavacek@lanl.gov>
Date: Mon, 11 May 2026 15:26:51 -0600
Subject: [PATCH 2/2] Use lru_cache for Python 3.8 compatibility

---
 bionetgen/main.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/bionetgen/main.py b/bionetgen/main.py
index 56fbbeee..51c58f07 100644
--- a/bionetgen/main.py
+++ b/bionetgen/main.py
@@ -627,7 +627,7 @@ class Meta:
         label = "bionetgen"
 
 
-@functools.cache
+@functools.lru_cache(maxsize=None)
 def get_default_app():
     """Return a configured BioNetGen cement app, initialized once per process."""
     app = BioNetGen()