⚡️ Speed up method DeckGL._add_pydeck_encoders by 9%

[codeflash-ai]

📄 9% (0.09x) speedup for DeckGL._add_pydeck_encoders in panel/pane/deckgl.py

⏱️ Runtime : 12.4 microseconds → 11.4 microseconds (best of 119 runs)

📝 Explanation and details

The optimized code achieves an 8% speedup by caching encoder functions as class attributes to avoid repeated function definitions. The key optimization is replacing the pattern where encoder functions were defined fresh on every call with a conditional caching mechanism using hasattr() checks.

What was optimized:

• Function definition caching: Encoder functions are now defined only once per class and stored as cls._pydeck_string_encoder and cls._pydeck_function_encoder attributes
• Conditional function creation: hasattr() checks ensure encoder functions are created only on first invocation, not every time the method runs

Why this leads to speedup:

• Eliminates redundant work: The original code defined two functions (pydeck_string_encoder and pydeck_function_encoder) on every method call, even when encoders were already registered. The optimization reduces this to just attribute lookups after the first call
• Reduced object creation overhead: Python function object creation has measurable overhead, especially when done repeatedly. By caching these functions as class attributes, subsequent calls avoid this allocation cost

Performance characteristics from test results:

• Best gains on repeated calls: Tests show 25-49% improvements when _add_pydeck_encoders() is called multiple times, as subsequent calls now only perform fast attribute lookups instead of recreating functions
• Minimal overhead for first call: The optimization adds small hasattr() checks but maintains similar performance for initial invocations
• Edge case preservation: Performance remains consistent when encoders are already added or pydeck is missing, with slight improvements in most scenarios

This optimization is particularly effective for applications that frequently reinitialize DeckGL components or call the encoder setup method multiple times.

✅ Correctness verification report:

Test	Status
⚙️ Existing Unit Tests	🔘 None Found
🌀 Generated Regression Tests	✅ 9 Passed
⏪ Replay Tests	🔘 None Found
🔎 Concolic Coverage Tests	🔘 None Found
📊 Tests Coverage	100.0%

🌀 Generated Regression Tests and Runtime

import sys
import types

# imports
import pytest
from panel.pane.deckgl import DeckGL


# Simulate a minimal pydeck.types module with Function and String classes
class DummyString:
    def __init__(self, value):
        self.value = value

class DummyFunction:
    def __init__(self, value):
        self.value = value
    def serialize(self):
        return f"serialized:{self.value}"

# Simulate pydeck.types
dummy_pydeck_types = types.ModuleType("pydeck.types")
dummy_pydeck_types.String = DummyString
dummy_pydeck_types.Function = DummyFunction

# Simulate pydeck module
dummy_pydeck = types.ModuleType("pydeck")
dummy_pydeck.types = dummy_pydeck_types

# Simulate bokeh.core.serialization.Serializer with a class-level _encoders dict
class DummySerializer:
    _encoders = {}

# Patch sys.modules for pydeck and bokeh.core.serialization
sys.modules["pydeck"] = dummy_pydeck
sys.modules["pydeck.types"] = dummy_pydeck_types
sys.modules["bokeh.core.serialization"] = types.SimpleNamespace(Serializer=DummySerializer)
from panel.pane.deckgl import DeckGL

# 1. Basic Test Cases

def test_encoders_are_added_basic():
    """Test that encoders for String and Function are added after calling _add_pydeck_encoders."""
    DeckGL._add_pydeck_encoders() # 774ns -> 580ns (33.4% faster)



def test_idempotency_of_encoder_addition():
    """Test that calling _add_pydeck_encoders multiple times does not overwrite or duplicate encoders."""
    DeckGL._add_pydeck_encoders() # 706ns -> 537ns (31.5% faster)
    encoders_before = DummySerializer._encoders.copy()
    DeckGL._add_pydeck_encoders() # 234ns -> 186ns (25.8% faster)
    encoders_after = DummySerializer._encoders.copy()

# 2. Edge Test Cases

def test_encoders_not_added_if_flag_set():
    """Test that encoders are not added if _pydeck_encoders_are_added is already True."""
    DeckGL._pydeck_encoders_are_added = True
    DummySerializer._encoders.clear()
    DeckGL._add_pydeck_encoders() # 503ns -> 494ns (1.82% faster)

def test_encoders_not_added_if_pydeck_missing(monkeypatch):
    """Test that encoders are not added if 'pydeck' is not in sys.modules."""
    monkeypatch.delitem(sys.modules, "pydeck", raising=False)
    DeckGL._pydeck_encoders_are_added = False
    DummySerializer._encoders.clear()
    DeckGL._add_pydeck_encoders() # 722ns -> 758ns (4.75% slower)
    # Restore for other tests
    sys.modules["pydeck"] = dummy_pydeck






def test_encoder_dict_integrity_after_large_additions():
    """Test that the encoders dict remains correct after many additions."""
    DeckGL._add_pydeck_encoders() # 750ns -> 503ns (49.1% faster)
    # Should only have DummyString and DummyFunction as keys
    keys = set(DummySerializer._encoders.keys())
# codeflash_output is used to check that the output of the original code is the same as that of the optimized code.
#------------------------------------------------
import sys

# imports
import pytest
from panel.pane.deckgl import DeckGL


# Minimal stubs to allow the function to run and be tested
class DummySerializer:
    _encoders = {}

class DummyString:
    def __init__(self, value):
        self.value = value

class DummyFunction:
    def __init__(self, result):
        self.result = result
    def serialize(self):
        return self.result

# Simulate pydeck.types module
class DummyPydeckTypes:
    Function = DummyFunction
    String = DummyString

class DummyPydeck:
    types = DummyPydeckTypes

sys.modules['pydeck'] = DummyPydeck
sys.modules['pydeck.types'] = DummyPydeckTypes
from panel.pane.deckgl import DeckGL

# unit tests

# ----------- Basic Test Cases ------------

def test_encoders_are_registered_on_first_call():
    """Test that encoders are registered on first call."""
    # Reset state
    DeckGL._pydeck_encoders_are_added = False
    DummySerializer._encoders.clear()
    DeckGL._add_pydeck_encoders() # 7.29μs -> 6.99μs (4.24% faster)
    # Check that encoders are registered
    from pydeck.types import Function, String



def test_encoders_not_added_if_already_added():
    """Test that encoders are not registered again if already added."""
    DeckGL._pydeck_encoders_are_added = True
    DummySerializer._encoders.clear()
    DeckGL._add_pydeck_encoders() # 629ns -> 600ns (4.83% faster)

def test_encoders_not_added_if_pydeck_not_in_sys_modules():
    """Test that encoders are not registered if pydeck is not in sys.modules."""
    DeckGL._pydeck_encoders_are_added = False
    DummySerializer._encoders.clear()
    # Remove pydeck from sys.modules
    sys.modules.pop('pydeck', None)
    DeckGL._add_pydeck_encoders() # 818ns -> 754ns (8.49% faster)
    # Restore pydeck
    sys.modules['pydeck'] = DummyPydeck







#------------------------------------------------
from panel.pane.deckgl import DeckGL

def test_DeckGL__add_pydeck_encoders():
    DeckGL._add_pydeck_encoders(DeckGL)

To edit these changes git checkout codeflash/optimize-DeckGL._add_pydeck_encoders-mhb1xrtv and push.