miao-moe/LanMountainDesktop
1
0
Fork 0
mirror of https://github.com/wwiinnddyy/LanMountainDesktop.git synced 2026-06-22 00:54:26 +08:00
Code Issues Packages Projects Releases Wiki Activity

0.3.14

Browse Source
This commit is contained in:
lincube
2026-03-05 14:34:33 +08:00
parent d182925b58
commit f3e7f88a39
15 changed files with 205 additions and 23 deletions
Download Patch File Download Diff File Expand all files Collapse all files

100
LanMountainDesktop/Services/AppSettingsService.cs
View File

@@ -11,6 +11,13 @@ public sealed class AppSettingsService
{
WriteIndented = true
};
private static readonly object CacheGate = new();
private static readonly TimeSpan CacheProbeInterval = TimeSpan.FromMilliseconds(400);
private static string? _cachedPath;
private static AppSettingsSnapshot? _cachedSnapshot;
private static DateTime _cachedWriteTimeUtc = DateTime.MinValue;
private static DateTime _lastProbeUtc = DateTime.MinValue;
private readonly string _settingsPath;
@@ -25,14 +32,32 @@ public sealed class AppSettingsService
{
try
{
if (!File.Exists(_settingsPath))
lock (CacheGate)
{
return new AppSettingsSnapshot();
}
var nowUtc = DateTime.UtcNow;
if (TryGetCachedWithoutProbe(nowUtc, out var cached))
{
return cached;
}
var json = File.ReadAllText(_settingsPath);
var snapshot = JsonSerializer.Deserialize<AppSettingsSnapshot>(json, SerializerOptions);
return snapshot ?? new AppSettingsSnapshot();
var hasFile = File.Exists(_settingsPath);
var writeTimeUtc = hasFile
? File.GetLastWriteTimeUtc(_settingsPath)
: DateTime.MinValue;
_lastProbeUtc = nowUtc;
if (TryGetCachedAfterProbe(writeTimeUtc, out cached))
{
return cached;
}
var loadedSnapshot = hasFile
? LoadSnapshotFromDisk()
: new AppSettingsSnapshot();
UpdateCache(loadedSnapshot, writeTimeUtc, nowUtc);
return loadedSnapshot.Clone();
}
}
catch
{
@@ -42,6 +67,8 @@ public sealed class AppSettingsService
public void Save(AppSettingsSnapshot snapshot)
{
var snapshotToPersist = snapshot?.Clone() ?? new AppSettingsSnapshot();
try
{
var directory = Path.GetDirectoryName(_settingsPath);
@@ -50,13 +77,70 @@ public sealed class AppSettingsService
Directory.CreateDirectory(directory);
}
var json = JsonSerializer.Serialize(snapshot, SerializerOptions);
var json = JsonSerializer.Serialize(snapshotToPersist, SerializerOptions);
File.WriteAllText(_settingsPath, json);
var writeTimeUtc = File.Exists(_settingsPath)
? File.GetLastWriteTimeUtc(_settingsPath)
: DateTime.UtcNow;
lock (CacheGate)
{
UpdateCache(snapshotToPersist, writeTimeUtc, DateTime.UtcNow);
}
}
catch
{
// Swallow persistence errors to keep UI interactions uninterrupted.
}
}
}
private bool TryGetCachedWithoutProbe(DateTime nowUtc, out AppSettingsSnapshot snapshot)
{
if (string.Equals(_cachedPath, _settingsPath, StringComparison.Ordinal) &&
_cachedSnapshot is not null &&
nowUtc - _lastProbeUtc < CacheProbeInterval)
{
snapshot = _cachedSnapshot.Clone();
return true;
}
snapshot = null!;
return false;
}
private bool TryGetCachedAfterProbe(DateTime writeTimeUtc, out AppSettingsSnapshot snapshot)
{
if (string.Equals(_cachedPath, _settingsPath, StringComparison.Ordinal) &&
_cachedSnapshot is not null &&
writeTimeUtc == _cachedWriteTimeUtc)
{
snapshot = _cachedSnapshot.Clone();
return true;
}
snapshot = null!;
return false;
}
private AppSettingsSnapshot LoadSnapshotFromDisk()
{
try
{
var json = File.ReadAllText(_settingsPath);
return JsonSerializer.Deserialize<AppSettingsSnapshot>(json, SerializerOptions) ?? new AppSettingsSnapshot();
}
catch
{
return new AppSettingsSnapshot();
}
}
private void UpdateCache(AppSettingsSnapshot snapshot, DateTime writeTimeUtc, DateTime probeTimeUtc)
{
_cachedPath = _settingsPath;
_cachedSnapshot = snapshot.Clone();
_cachedWriteTimeUtc = writeTimeUtc;
_lastProbeUtc = probeTimeUtc;
}
}