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62 lines
2.1 KiB
Markdown
62 lines
2.1 KiB
Markdown
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---
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sidebar_position: 2
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---
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# Logging
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CherryPick lets you log all dependency injection (DI) events and errors using a flexible observer mechanism.
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## Custom Observers
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You can pass any implementation of `CherryPickObserver` to your root scope or any sub-scope.
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This allows centralized and extensible logging, which you can direct to print, files, visualization frameworks, external loggers, or systems like [Talker](https://pub.dev/packages/talker).
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### Example: Printing All Events
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```dart
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import 'package:cherrypick/cherrypick.dart';
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void main() {
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// Use the built-in PrintCherryPickObserver for console logs
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final observer = PrintCherryPickObserver();
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final scope = CherryPick.openRootScope(observer: observer);
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// All DI actions and errors will now be printed!
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}
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```
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### Example: Advanced Logging with Talker
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For richer logging, analytics, or UI overlays, use an advanced observer such as [talker_cherrypick_logger](../talker_cherrypick_logger):
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```dart
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import 'package:cherrypick/cherrypick.dart';
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import 'package:talker/talker.dart';
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import 'package:talker_cherrypick_logger/talker_cherrypick_logger.dart';
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void main() {
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final talker = Talker();
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final observer = TalkerCherryPickObserver(talker);
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CherryPick.openRootScope(observer: observer);
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// All container events go to the Talker log system!
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}
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```
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## Default Behavior
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- By default, logging is silent (`SilentCherryPickObserver`) for production, with no output unless you supply an observer.
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- You can configure observers **per scope** for isolated, test-specific, or feature-specific logging.
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## Observer Capabilities
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Events you can observe and log:
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- Dependency registration
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- Instance requests, creations, disposals
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- Module installs/removals
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- Scope opening/closing
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- Cache hits/misses
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- Cycle detection
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- Diagnostics, warnings, errors
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Just implement or extend `CherryPickObserver` and direct messages anywhere you want!
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## When to Use
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- Enable verbose logging and debugging in development or test builds.
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- Route logs to your main log system or analytics.
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- Hook into DI lifecycle for profiling or monitoring.
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