daniel-c-harvey
77 lines
3.4 KiB
C#
77 lines
3.4 KiB
C#
using DeepDrftModels.DTOs;
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using DeepDrftPublic.Client.ViewModels;
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using Microsoft.AspNetCore.Components;
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namespace DeepDrftPublic.Client.Pages;
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/// <summary>
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/// Shared load + prerender-bridge logic for the single-release detail pages (Session, Mix).
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/// Subclasses supply only their markup; this base loads the release through
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/// <see cref="ReleaseDetailViewModel"/> and bridges the prerendered release across the prerender ->
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/// WASM seam so the WASM pass does not re-fetch (see the TracksView seam). The playable track is
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/// re-resolved on a restore miss only.
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/// </summary>
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public abstract class ReleaseDetailBase : ComponentBase, IDisposable
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{
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[Parameter] public long Id { get; set; }
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[Inject] public required ReleaseDetailViewModel ViewModel { get; set; }
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[Inject] public required PersistentComponentState PersistentState { get; set; }
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private PersistingComponentStateSubscription _persistingSubscription;
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// The release id the ViewModel currently holds. Tracks param-only navigations (e.g.
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// /mixes/5 -> /mixes/8) which reuse this component instance and fire OnParametersSet
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// without re-running OnInitialized — without this, the page would keep the prior
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// release's track and Play would stream the wrong audio.
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private long _loadedId;
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private bool _loaded;
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// Distinct keys per medium so a Session restore never lands on a Mix page.
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protected abstract string PersistKey { get; }
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protected override void OnInitialized()
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=> _persistingSubscription = PersistentState.RegisterOnPersisting(Persist);
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protected override async Task OnParametersSetAsync()
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{
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// Re-run whenever the route id changes. Component instances are reused across
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// same-template navigations, so the load decision must live here, not in
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// OnInitialized (which fires once per instance).
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if (_loaded && _loadedId == Id) return;
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// Capture the id synchronously before any await so that a re-entrant call
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// (rapid navigation or a re-render that changes Id while Load is in flight)
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// sees the correct guard state. Without this, a second OnParametersSetAsync
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// for the same Id would bypass the guard above and start a second Load,
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// causing two ViewModel.Load calls to race on the single scoped instance.
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_loadedId = Id;
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_loaded = true;
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// The bridged payload carries both the release and its resolved track so the interactive
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// pass renders identically without a second round-trip. Guard on the id: a payload for a
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// different release must not seed this page (stale-bridge bleed across navigation).
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if (PersistentState.TryTakeFromJson<BridgedDetail>(PersistKey, out var restored)
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&& restored?.Release is not null
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&& restored.Release.Id == Id)
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{
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ViewModel.Restore(restored.Release, restored.Track);
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}
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else
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{
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await ViewModel.Load(Id);
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}
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}
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private Task Persist()
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{
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if (ViewModel.Release is not null)
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PersistentState.PersistAsJson(PersistKey, new BridgedDetail(ViewModel.Release, ViewModel.Track));
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return Task.CompletedTask;
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}
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public void Dispose() => _persistingSubscription.Dispose();
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// JSON-serializable bridge payload. Round-trips through PersistentComponentState's serializer.
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protected sealed record BridgedDetail(ReleaseDto Release, TrackDto? Track);
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}
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