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Dagster/API_R&D/api/assets.py

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+from typing import Any, Dict, Optional
+from copy import deepcopy
+from api.io_port import DType
+
+
+class Asset:
+    """
+    Represents the output of a Task.
+
+    Stores:
+    - data: actual payload
+    - dtype: semantic type (DType instance)
+    - metadata: optional dictionary
+    """
+
+    def __init__(self, data: Any, dtype: Optional[DType] = None, metadata: Optional[Dict[str, Any]] = None):
+        self.data = data
+        self.dtype = dtype              # DO NOT deepcopy dtype
+        self.metadata = metadata or {}
+
+        # Whether this asset should be preserved after workflow execution
+        self.preserved = True
+
+    # Lifecycle
+    def dismiss(self):
+        """Mark asset as disposable."""
+        self.preserved = False
+
+    # Utility
+    def clone(self) -> "Asset":
+        """
+        Create a deep copy of the asset.
+        dtype is NOT deepcopied because DType objects are not deepcopy-safe.
+        """
+        return Asset(
+            data=deepcopy(self.data),
+            dtype=self.dtype,                     # keep reference
+            metadata=deepcopy(self.metadata)
+        )
+
+    # Representation
+    def __repr__(self):
+        # Avoid printing full dtype object (may contain nested structures)
+        dtype_name = self.dtype.__class__.__name__ if self.dtype else "None"
+        return f"<Asset dtype={dtype_name} preserved={self.preserved}>"