From 158c52a4673230f27a1f2608087ccfb7d1df8644 Mon Sep 17 00:00:00 2001
From: Jerome Kieffer <jerome.kieffer@esrf.fr>
Date: Fri, 2 Feb 2024 09:23:00 +0100
Subject: [PATCH] close #2072

---
 src/pyFAI/diffmap.py                  | 21 ++++++++++++---------
 src/pyFAI/test/test_bug_regression.py |  7 ++++++-
 2 files changed, 18 insertions(+), 10 deletions(-)

diff --git a/src/pyFAI/diffmap.py b/src/pyFAI/diffmap.py
index ee8fd36a6..6bb0dcb2a 100644
--- a/src/pyFAI/diffmap.py
+++ b/src/pyFAI/diffmap.py
@@ -3,7 +3,7 @@
 #    Project: Azimuthal integration
 #             https://github.com/silx-kit/pyFAI
 #
-#    Copyright (C) 2015-2023 European Synchrotron Radiation Facility, Grenoble, France
+#    Copyright (C) 2015-2024 European Synchrotron Radiation Facility, Grenoble, France
 #
 #    Principal author:       Jérôme Kieffer (Jerome.Kieffer@ESRF.eu)
 #
@@ -31,7 +31,7 @@
 __contact__ = "Jerome.Kieffer@ESRF.eu"
 __license__ = "MIT"
 __copyright__ = "European Synchrotron Radiation Facility, Grenoble, France"
-__date__ = "28/08/2023"
+__date__ = "02/02/2024"
 __status__ = "development"
 __docformat__ = 'restructuredtext'
 
@@ -48,9 +48,10 @@
 import json
 import __main__ as main
 from .opencl import ocl
-from . import version as PyFAI_VERSION, date as PyFAI_DATE, load
+from . import version as PyFAI_VERSION, date as PyFAI_DATE, load, load_integrators
 from .io import Nexus, get_isotime, h5py
 from .worker import Worker, _reduce_images
+from .method_registry import Method, IntegrationMethod
 
 DIGITS = [str(i) for i in range(10)]
 Position = collections.namedtuple('Position', 'index, rot, trans')
@@ -96,6 +97,7 @@ def __init__(self, npt_fast=0, npt_slow=1, npt_rad=1000, npt_azim=None):
         self.nxs = None
         self.entry_grp = None
         self.experiment_title = "Diffraction Mapping"
+        # method is a property from worker
 
     def __repr__(self):
         return "%s experiment with ntp_slow: %s ntp_fast: %s, npt_diff: %s" % \
@@ -604,14 +606,15 @@ def process(self):
         self.nxs.close()
 
     def get_use_gpu(self):
-        return self.method.impl_lower == "opencl"
+        return self.worker._method.impl_lower == "opencl"
 
     def set_use_gpu(self, value):
-        if value:
-            method = self.method.method.fixed("opencl")
-        else:
-            method = self.method.method.fixed("cython")
-        self.method = method
+        if self.worker:
+            if value:
+                method = self.worker._method.method.fixed("opencl")
+            else:
+                method = self.worker._method.method.fixed("cython")
+            self.worker.set_method(method)
 
     use_gpu = property(get_use_gpu, set_use_gpu)
 
diff --git a/src/pyFAI/test/test_bug_regression.py b/src/pyFAI/test/test_bug_regression.py
index 76da958ec..6c7af339f 100644
--- a/src/pyFAI/test/test_bug_regression.py
+++ b/src/pyFAI/test/test_bug_regression.py
@@ -36,7 +36,7 @@
 __contact__ = "Jerome.Kieffer@esrf.fr"
 __license__ = "MIT"
 __copyright__ = "2015-2024 European Synchrotron Radiation Facility, Grenoble, France"
-__date__ = "30/01/2024"
+__date__ = "02/02/2024"
 
 import sys
 import os
@@ -585,6 +585,11 @@ def test_bug_1946(self):
         res = IntegrationMethod.select_method(dim=1, split="full", algo="csc", impl="python", degradable=False)
         self.assertGreater(len(res), 0, "method actually exists")
 
+    def test_bug_2072(self):
+        from ..diffmap import DiffMap
+        d = DiffMap()
+        d.use_gpu # used to raise AttributeError
+        d.use_gpu = True # used to raise AttributeError
 
 class TestBug1703(unittest.TestCase):
     """