Copy tilesource instances to add styles

Instead of reopening a tilesource when adding a style, copy the unstyled
class and add the style information.

large_image/cache_util/cache.py

@@ -1,3 +1,4 @@
+import copy
 import functools
 import threading
 
@@ -193,6 +194,17 @@ def __call__(cls, *args, **kwargs):  # noqa - N805
                         return result
                 except KeyError:
                     pass
+            # This conditionally copies a non-styled class and add a style.
+            if kwargs.get('style') and hasattr(cls, '_setStyle'):
+                subkwargs = kwargs.copy()
+                subkwargs.pop('style')
+                subresult = cls(*args, **subkwargs)
+                result = copy.copy(subresult)
+                result._setStyle(kwargs['style'])
+                result._classkey = key
+                with cacheLock:
+                    cache[key] = result
+                    return result
             try:
                 instance = super().__call__(*args, **kwargs)
             except Exception as exc:

large_image/tilesource/base.py

@@ -127,7 +127,6 @@ def __init__(self, encoding='JPEG', jpegQuality=95, jpegSubsampling=0,
         self.sizeX = None
         self.sizeY = None
         self._styleLock = threading.RLock()
-        self._bandRanges = {}
 
         if encoding not in TileOutputMimeTypes:
             raise ValueError('Invalid encoding "%s"' % encoding)
@@ -137,6 +136,15 @@ def __init__(self, encoding='JPEG', jpegQuality=95, jpegSubsampling=0,
         self.jpegSubsampling = int(jpegSubsampling)
         self.tiffCompression = tiffCompression
         self.edge = edge
+        self._setStyle(style)
+
+    def _setStyle(self, style):
+        """
+        Check and set the specified style from a json string or a dictionary.
+
+        :param style: The new style.
+        """
+        self._bandRanges = {}
         self._jsonstyle = style
         if style:
             if isinstance(style, dict):

sources/gdal/large_image_source_gdal/__init__.py

@@ -183,6 +183,16 @@ def __init__(self, path, projection=None, unitsPerPixel=None, **kwargs):
         self._getTileLock = threading.Lock()
         self._setDefaultStyle()
 
+    def _setStyle(self, style):
+        """
+        Check and set the specified style from a json string or a dictionary.
+
+        :param style: The new style.
+        """
+        super()._setStyle(style)
+        if hasattr(self, '_getTileLock'):
+            self._setDefaultStyle()
+
     def _getLargeImagePath(self):
         """Get GDAL-compatible image path.
 

sources/mapnik/large_image_source_mapnik/__init__.py

@@ -177,7 +177,9 @@ def _checkNetCDF(self):
 
     def _setDefaultStyle(self):
         """Don't inherit from GDAL tilesource."""
-        pass
+        with self._getTileLock:
+            if hasattr(self, '_mapnikMap'):
+                del self._mapnikMap
 
     @staticmethod
     def interpolateMinMax(start, stop, count):