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namespace HyperBooru.Util;
public static class Extensions {
public static readonly string[] MagnitudeOrders = new[] {
"K", "M", "G", "T", "P", "E", "Z", "Y", "R", "Q"
};
public static string? NullIfEmpty(this string s) {
s = s.Trim();
return string.IsNullOrEmpty(s) ? null : s;
}
public static DateTime? TryParseDateTimeUtc(this string s) {
bool success = DateTime.TryParse(s, out var dateTime);
return success ? DateTime.SpecifyKind(dateTime, DateTimeKind.Utc) : null;
}
public static string ToBytesSI(this long x) {
var exp = (int) Math.Log10(x);
var suffix = MagnitudeOrders.ElementAtOrDefault(exp / 3 - 1);
if(suffix is null)
return x.ToString();
double n = x / Math.Pow(10, exp / 3 * 3);
return $"{Math.Round(n, 2 - (exp % 3))} {suffix}B";
}
public static string ToStringHumanReadable(this TimeSpan t) {
if(t.TotalMilliseconds < 1000)
return string.Format("{0:0}ms", t.TotalMilliseconds);
if(t.TotalSeconds < 60)
return string.Format("{0:0.00}s", t.TotalSeconds);
if(t.TotalMinutes < 60)
return string.Format("{0:0}m{0:0}s", t.TotalMinutes, t.Seconds);
if(t.TotalHours < 24)
return string.Format("{0:0}h{0:0}m", t.TotalHours, t.Minutes);
return string.Format("{0:0.00}d", t.TotalDays);
}
public static int GetRoundedHashCode(this DateTime dt) {
var t = dt.ToUniversalTime();
return HashCode.Combine(t.Year, t.Month, t.Date, t.Hour, t.Minute, t.Second);
}
}
public class LimitedConcurrencyTaskScheduler : TaskScheduler {
public sealed override int MaximumConcurrencyLevel =>
maxConcurrency;
private int maxConcurrency;
[ThreadStatic]
private static bool threadIsProcessingItems;
private readonly LinkedList<Task> tasks = new();
private int delegatesQueuedOrRunning = 0;
public LimitedConcurrencyTaskScheduler() {
maxConcurrency = Environment.ProcessorCount;
}
public LimitedConcurrencyTaskScheduler(int maxConcurrency) {
if(maxConcurrency < 1)
throw new ArgumentOutOfRangeException("maxConcurrency must be greater than 0");
this.maxConcurrency = (int) maxConcurrency;
}
protected sealed override void QueueTask(Task task) {
lock(tasks) {
tasks.AddLast(task);
if(delegatesQueuedOrRunning < maxConcurrency) {
delegatesQueuedOrRunning++;
NotifyThreadPoolOfPendingWork();
}
}
}
private void NotifyThreadPoolOfPendingWork() {
ThreadPool.UnsafeQueueUserWorkItem(_ => {
threadIsProcessingItems = true;
try {
while(true) {
Task item;
lock(tasks) {
if(tasks.Count == 0) {
delegatesQueuedOrRunning--;
break;
} else {
item = tasks.First.Value;
tasks.RemoveFirst();
}
}
TryExecuteTask(item);
}
} finally {
threadIsProcessingItems = false;
}
}, null);
}
protected sealed override bool TryExecuteTaskInline(Task task, bool taskWasPreviouslyQueued) {
if(!threadIsProcessingItems)
return false;
if(taskWasPreviouslyQueued)
return TryDequeue(task) ? TryExecuteTask(task) : false;
else
return TryExecuteTask(task);
}
protected sealed override bool TryDequeue(Task task) {
lock(tasks) {
return tasks.Remove(task);
}
}
protected sealed override IEnumerable<Task> GetScheduledTasks() {
bool lockTaken = false;
try {
Monitor.TryEnter(tasks, ref lockTaken);
if(lockTaken)
return tasks;
else
throw new NotSupportedException();
} finally {
if(lockTaken)
Monitor.Exit(tasks);
}
}
}
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