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7 changes: 4 additions & 3 deletions debug_toolbar/apps.py
Original file line number Diff line number Diff line change
Expand Up @@ -17,9 +17,10 @@ class DebugToolbarConfig(AppConfig):
def ready(self):
from debug_toolbar.toolbar import DebugToolbar

# Import the panels when the app is ready. This allows panels
# like CachePanel to enable the instrumentation immediately.
DebugToolbar.get_panel_classes()
# Import the panels when the app is ready and call their ready() methods. This
# allows panels like CachePanel to enable their instrumentation immediately.
for cls in DebugToolbar.get_panel_classes():
cls.ready()


def check_template_config(config):
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13 changes: 13 additions & 0 deletions debug_toolbar/panels/__init__.py
Original file line number Diff line number Diff line change
Expand Up @@ -114,6 +114,19 @@ def scripts(self):
"""
return []

# Panel early initialization

@classmethod
def ready(cls):
"""
Perform early initialization for the panel.

This should only include initialization or instrumentation that needs to
be done unconditionally for the panel regardless of whether it is
enabled for a particular request. It should be idempotent.
"""
pass

# URLs for panel-specific views

@classmethod
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