refactor(INetworkMonitorService): add reuse state function

[ArgoZhang]

Link issues

fixes #6408

Summary By Copilot

Regression?

• Yes
• No

Risk

• High
• Medium
• Low

Verification

• Manual (required)
• Automated

Packaging changes reviewed?

• Yes
• No
• N/A

☑️ Self Check before Merge

⚠️ Please check all items below before review. ⚠️

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• Merge the latest code from the main branch

Summary by Sourcery

Refactor DefaultNetworkMonitorService to persist and reuse the latest network state for late-registered callbacks, introduce a timeout for semaphore acquisition, and update the sample component to safely handle a nullable logger

New Features:

• Cache and immediately replay the last network monitor state to new subscribers

Bug Fixes:

• Make ConsoleLogger nullable and use a null-conditional log call in the NetworkMonitors sample to avoid null reference

Enhancements:

• Add a 3000ms timeout to the initialization semaphore in DefaultNetworkMonitorService

[sourcery-ai]

Reviewer's Guide

This refactor adds a reuse mechanism for the last known network state in DefaultNetworkMonitorService—caching incoming states, immediately invoking newly registered callbacks with the cached state, and introducing a semaphore timeout—while also updating the sample component for nullable logging.

Sequence diagram for RegisterStateChangedCallback with state reuse

sequenceDiagram
    participant Component
    participant DefaultNetowrkMonitorService
    participant Callback

    Component->>DefaultNetowrkMonitorService: RegisterStateChangedCallback(callback)
    DefaultNetowrkMonitorService->>DefaultNetowrkMonitorService: Add or update callback in _callbacks
    alt _state is not null
        DefaultNetowrkMonitorService->>Callback: Invoke callback(_state)
    end
    alt !_init
        DefaultNetowrkMonitorService->>DefaultNetowrkMonitorService: Wait on _semaphoreSlim (timeout 3000ms)
        DefaultNetowrkMonitorService->>DefaultNetowrkMonitorService: Set _init = true (if not already)
    end

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Class diagram for DefaultNetowrkMonitorService state reuse refactor

classDiagram
    class DefaultNetowrkMonitorService {
        - ConcurrentDictionary<IComponent, Func<NetworkMonitorState, Task>> _callbacks
        - bool _init
        - SemaphoreSlim _semaphoreSlim
        - NetworkMonitorState? _state
        + DefaultNetowrkMonitorService(IJSRuntime jsRuntime)
        + Task<NetworkMonitorState> GetNetworkMonitorState(CancellationToken token)
        + Task RegisterStateChangedCallback(IComponent component, Func<NetworkMonitorState, Task> callback)
        + void UnregisterStateChangedCallback(IComponent component)
        + Task TriggerNetworkStateChanged(NetworkMonitorState state)
    }

    DefaultNetowrkMonitorService --> IJSRuntime
    DefaultNetowrkMonitorService --> IComponent
    DefaultNetowrkMonitorService --> NetworkMonitorState
    DefaultNetowrkMonitorService --> SemaphoreSlim

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Class diagram for NetworkMonitors sample component logger update

classDiagram
    class NetworkMonitors {
        - ConsoleLogger? _logger
        + Task OnNetworkStateChanged(NetworkMonitorState state)
    }
    NetworkMonitors --> ConsoleLogger
    NetworkMonitors --> NetworkMonitorState

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File-Level Changes

Change	Details	Files
Implement state caching and reuse in network monitor service	Added private _state field to store last NetworkMonitorState Stored state in TriggerNetworkStateChanged before dispatching callbacks Immediately invoked new callbacks with cached state in RegisterStateChangedCallback	src/BootstrapBlazor/Services/DefaultNetworkMonitorService.cs
Introduce timeout for initialization semaphore	Updated semaphore WaitAsync call to include a 3000ms timeout	src/BootstrapBlazor/Services/DefaultNetworkMonitorService.cs
Update sample component to handle nullable logger	Changed ConsoleLogger field to nullable Used null-conditional operator when logging network state	src/BootstrapBlazor.Server/Components/Samples/NetworkMonitors.razor.cs

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#6408	Add a reuse state function to INetworkMonitorService.	✅

Possibly linked issues

• refactor(INetworkMonitorService): add reuse state function #6408: The PR adds a state field and reuses it for new callbacks, addressing the issue's request to add a reuse state function.

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[sourcery-ai]

Hey @ArgoZhang - I've reviewed your changes and they look great!

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