Reduce allocations in ShellScope

[sebastienros]

While debugging the concurrency issues I noticed most of these collections were mostly unused and could be initialized only when necessary.

Summary by CodeRabbit

• Refactor
  • Improved the robustness of ShellScope handling by enhancing the initialization and nullability of internal structures to better manage shared items and callbacks.

[coderabbitai]

Walkthrough

Walkthrough

The recent update focuses on enhancing the ShellScope class in OrchardCore by making initialization of private fields lazy and nullable. This change improves null safety and robustness in handling shared items and callbacks. The modifications are geared towards better management of scope lifecycle events and error handling.

Changes

File Path	Change Summary
.../Shell/Scope/ShellScope.cs	Updated private fields to be nullable and uninitialized by default. Adjusted methods to handle potential null references more robustly, enhancing the management of shared items, callbacks, and lifecycle events.

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Recent Review Details

Configuration used: CodeRabbit UI
Review profile: CHILL

Commits

Files that changed from the base of the PR and between 7bff0b9 and 7139171.

Files selected for processing (1)

• src/OrchardCore/OrchardCore.Abstractions/Shell/Scope/ShellScope.cs (7 hunks)

Additional comments not posted (10)

src/OrchardCore/OrchardCore.Abstractions/Shell/Scope/ShellScope.cs (10)

22-26: Ensure that all methods accessing these fields handle their potential null values correctly to avoid null reference exceptions.

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87-93: Correct implementation of lazy initialization in Set method. Ensure that all similar methods follow this pattern to maintain consistency.

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100-112: Correct implementation of lazy initialization in Get method. Ensure that all similar methods follow this pattern to maintain consistency.

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117-129: Correct implementation of lazy initialization in Get<T> method. Ensure that all similar methods follow this pattern to maintain consistency.

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136-148: Correct implementation of lazy initialization in GetOrCreate<T> method. Ensure that all similar methods follow this pattern to maintain consistency.

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159-171: Correct implementation of lazy initialization in GetOrCreate<T> method for class types. Ensure that all similar methods follow this pattern to maintain consistency.

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379-379: Correct implementation of lazy initialization in BeforeDispose method. Ensure that all similar methods follow this pattern to maintain consistency.

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384-384: Correct implementation of lazy initialization in DeferredSignal method. Ensure that all similar methods follow this pattern to maintain consistency.

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389-389: Correct implementation of lazy initialization in DeferredTask method. Ensure that all similar methods follow this pattern to maintain consistency.

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394-394: Correct implementation of lazy initialization in ExceptionHandler method. Ensure that all similar methods follow this pattern to maintain consistency.

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[sebastienros]

Improved the robustness of ShellScope handling by enhancing the initialization and nullability of internal structures to better manage shared items and callbacks.

Nope!