venv added, updated

myenv/lib/python3.12/site-packages/reactivex/disposable/singleassignmentdisposable.py

@@ -0,0 +1,53 @@
+from threading import RLock
+from typing import Optional
+
+from reactivex.abc import DisposableBase
+
+
+class SingleAssignmentDisposable(DisposableBase):
+    """Single assignment disposable.
+
+    Represents a disposable resource which only allows a single
+    assignment of its underlying disposable resource. If an underlying
+    disposable resource has already been set, future attempts to set the
+    underlying disposable resource will throw an Error."""
+
+    def __init__(self) -> None:
+        """Initializes a new instance of the SingleAssignmentDisposable
+        class.
+        """
+        self.is_disposed: bool = False
+        self.current: Optional[DisposableBase] = None
+        self.lock = RLock()
+
+        super().__init__()
+
+    def get_disposable(self) -> Optional[DisposableBase]:
+        return self.current
+
+    def set_disposable(self, value: DisposableBase) -> None:
+        if self.current:
+            raise Exception("Disposable has already been assigned")
+
+        with self.lock:
+            should_dispose = self.is_disposed
+            if not should_dispose:
+                self.current = value
+
+        if self.is_disposed and value:
+            value.dispose()
+
+    disposable = property(get_disposable, set_disposable)
+
+    def dispose(self) -> None:
+        """Sets the status to disposed"""
+        old: Optional[DisposableBase] = None
+
+        with self.lock:
+            if not self.is_disposed:
+                self.is_disposed = True
+                old = self.current
+                self.current = None
+
+        if old is not None:
+            old.dispose()