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CausalClock.cs
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CausalClock.cs
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using System;
namespace Orleans.Transactions
{
public class CausalClock
{
private readonly object lockable = new object();
private readonly IClock clock;
private long previous;
public CausalClock(IClock clock)
{
this.clock = clock ?? throw new ArgumentNullException(nameof(clock));
}
public DateTime UtcNow()
{
lock (this.lockable)
{
var ticks = previous = Math.Max(previous + 1, this.clock.UtcNow().Ticks);
return new DateTime(ticks, DateTimeKind.Utc);
}
}
public DateTime Merge(DateTime timestamp)
{
lock (this.lockable)
{
var ticks = previous = Math.Max(previous, timestamp.Ticks);
return new DateTime(ticks, DateTimeKind.Utc);
}
}
public DateTime MergeUtcNow(DateTime timestamp)
{
lock (this.lockable)
{
var ticks = previous = Math.Max(Math.Max(previous + 1, timestamp.Ticks + 1), this.clock.UtcNow().Ticks);
return new DateTime(ticks, DateTimeKind.Utc);
}
}
}
}