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