feat: speed up requires_package using caching (#3705)

* test: refactor check_stds and post_mortem_checks

* test: backing off algorithm

* chore: adding changelog file 3703.added.md [dependabot-skip]

* fix: codacity warnings

* feat: using get_value to obtain the n elements

* revert: revert "feat: using get_value to obtain the n elements"
Performance is not as go

This reverts commit 877f803.

* feat: using get_value to obtain the n elements

* revert: revert "feat: using get_value to obtain the n elements"
Performance is not as go

This reverts commit 877f803.

* feat: using mapdl.exit when raising final error.

* test: fix test by avoiding killing mapdl.

* fix: test

* fix: test

* feat: adding warnings when restarting MAPDL during testing

* fix: test

* feat: caching requires_package

* test: adding more tests

* chore: adding changelog file 3705.added.md [dependabot-skip]

* chore: adding changelog file 3705.added.md [dependabot-skip]

* fix: warnings import

---------

Co-authored-by: pyansys-ci-bot <[email protected]>

Author: germa89

doc/changelog.d/3705.added.md

@@ -0,0 +1 @@
+feat: speed up `requires_package` using caching

src/ansys/mapdl/core/misc.py

@@ -22,7 +22,7 @@
 
 """Module for miscellaneous functions and methods"""
 from enum import Enum
-from functools import wraps
+from functools import cache, wraps
 import importlib
 import inspect
 import os
@@ -415,6 +415,16 @@ def write_array(filename: Union[str, bytes], array: np.ndarray) -> None:
     np.savetxt(filename, array, fmt="%20.12f")
 
 
+@cache
+def is_package_installed_cached(package_name):
+    try:
+        importlib.import_module(package_name)
+        return True
+
+    except ModuleNotFoundError:
+        return False
+
+
 def requires_package(package_name: str, softerror: bool = False) -> Callable:
     """
     Decorator check whether a package is installed or not.
@@ -430,11 +440,11 @@ def requires_package(package_name: str, softerror: bool = False) -> Callable:
     def decorator(function):
         @wraps(function)
         def wrapper(self, *args, **kwargs):
-            try:
-                importlib.import_module(package_name)
+
+            if is_package_installed_cached(package_name):
                 return function(self, *args, **kwargs)
 
-            except ModuleNotFoundError:
+            else:
                 msg = (
                     f"To use the method '{function.__name__}', "
                     f"the package '{package_name}' is required.\n"

tests/common.py

@@ -26,6 +26,7 @@
 import subprocess
 import time
 from typing import Dict, List
+from warnings import warn
 
 import psutil
 

tests/test_mapdl.py

@@ -2836,3 +2836,14 @@ def test_none_on_selecting(mapdl, cleared, func):
 
     assert len(selfunc("all")) > 0
     assert len(selfunc(None)) == 0
+
+
+def test_requires_package_speed():
+    from ansys.mapdl.core.misc import requires_package
+
+    @requires_package("pyvista")
+    def my_func(i):
+        return i + 1
+
+    for i in range(1_000_000):
+        my_func(i)