angstwad · December 2, 2024 22:37 · Dec 2, 2024 · Dec 2, 2024 · Dec 2, 2024 · Dec 2, 2024
diff --git a/LICENSE → z_LICENSE b/LICENSE → z_LICENSE
diff --git a/LICENSE b/LICENSE
@@ -0,0 +1,13 @@
+# Copyright 2024 Paul Durivage <pauldurivage+github@gmail.com>
+
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+
+#    http://www.apache.org/licenses/LICENSE-2.0
+
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
diff --git a/singleton-LICENSE b/singleton-LICENSE
@@ -1,13 +0,0 @@
-# Copyright 2024 Paul Durivage <pauldurivage+github@gmail.com>
-
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-
-#    http://www.apache.org/licenses/LICENSE-2.0
-
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.

diff --git a/singleton LICENSE → singleton-LICENSE b/singleton LICENSE → singleton-LICENSE
diff --git a/LICENSE → singleton LICENSE b/LICENSE → singleton LICENSE
diff --git a/LICENSE b/LICENSE
@@ -0,0 +1,13 @@
+# Copyright 2024 Paul Durivage <pauldurivage+github@gmail.com>
+
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+
+#    http://www.apache.org/licenses/LICENSE-2.0
+
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
diff --git a/singleton.py b/singleton.py
@@ -0,0 +1,26 @@
+class SingletonMixin:
+    """ Threading safe singleton mixin class.  Will run __init__ on subclasses for every
+    invocation, so check self._initialized from __init__ to get around this if not desired.
+
+    Use:
+    class MyClass(SingletonMixin):
+        def __init__(self):
+          if not self._initialized:
+             # initialize here
+             self.foo = 'bar'
+             # when done, set initialized to True
+             self._initialized = True
+    """
+    _instances: dict[type, Any] = {}
+    _lock = threading.Lock()
+    _initialized: bool
+
+    def __new__(cls):
+        with SingletonMixin._lock:
+            if cls not in SingletonMixin._instances:
+                # Create instance
+                instance = super().__new__(cls)
+                SingletonMixin._instances[cls] = instance
+                instance._initialized = False
+        # Return existing instance
+        return SingletonMixin._instances[cls]
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