46 lines
1.5 KiB
C#
46 lines
1.5 KiB
C#
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using System;
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namespace SharpChat.Configuration {
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public class CachedValue<T> {
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private IConfig Config { get; }
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private string Name { get; }
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private TimeSpan Lifetime { get; }
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private T Fallback { get; }
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private object Sync { get; } = new();
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private object CurrentValue { get; set; }
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private DateTimeOffset LastRead { get; set; }
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public T Value {
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get {
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lock(Sync) {
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DateTimeOffset now = DateTimeOffset.Now;
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if((now - LastRead) >= Lifetime) {
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LastRead = now;
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CurrentValue = Config.ReadValue(Name, Fallback);
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Logger.Debug($@"Read {Name} ({CurrentValue})");
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}
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}
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return (T)CurrentValue;
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}
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}
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public static implicit operator T(CachedValue<T> val) => val.Value;
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public CachedValue(IConfig config, string name, TimeSpan lifetime, T fallback) {
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Config = config ?? throw new ArgumentNullException(nameof(config));
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Name = name ?? throw new ArgumentNullException(nameof(name));
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Lifetime = lifetime;
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Fallback = fallback;
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if(string.IsNullOrWhiteSpace(name))
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throw new ArgumentException(@"Name cannot be empty.", nameof(name));
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}
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public void Refresh() {
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lock(Sync) {
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LastRead = DateTimeOffset.MinValue;
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}
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}
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}
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}
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