FormatNXmx: open NeXus HDF5 files in SWMR mode (#478)

cctbx · Feb 8, 2022 · 6fdca14 · 6fdca14
1 parent 42b1945
commit 6fdca14
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Showing 2 changed files with 4 additions and 3 deletions.
diff --git a/newsfragments/478.bugfix b/newsfragments/478.bugfix
@@ -0,0 +1 @@
+FormatNXmx: Open nexus files in SWMR mode.
diff --git a/src/dxtbx/format/FormatNXmx.py b/src/dxtbx/format/FormatNXmx.py
@@ -12,7 +12,7 @@ class FormatNXmx(FormatNexus):
 
     @staticmethod
     def understand(image_file):
-        with h5py.File(image_file, "r") as handle:
+        with h5py.File(image_file, "r", swmr=True) as handle:
             name = dxtbx.nexus.nxmx.h5str(FormatNXmx.get_instrument_name(handle))
         # Temporarily restrict this to I19-2 while developing
         if name and "I19-2" in name:
@@ -26,7 +26,7 @@ def __init__(self, image_file, **kwargs):
     def _start(self):
         self._static_mask = None
 
-        with h5py.File(self._image_file, "r") as fh:
+        with h5py.File(self._image_file, "r", swmr=True) as fh:
             nxmx = dxtbx.nexus.nxmx.NXmx(fh)
             nxsample = nxmx.entries[0].samples[0]
             nxinstrument = nxmx.entries[0].instruments[0]
@@ -61,7 +61,7 @@ def get_static_mask(self, index=None, goniometer=None):
 
     def get_raw_data(self, index):
         if self._cached_file_handle is None:
-            self._cached_file_handle = h5py.File(self._image_file, "r")
+            self._cached_file_handle = h5py.File(self._image_file, "r", swmr=True)
 
         nxmx = dxtbx.nexus.nxmx.NXmx(self._cached_file_handle)
         nxdata = nxmx.entries[0].data[0]