UtcUIDGrain.cs
1.92 KB
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using Orleans;
using Orleans.Concurrency;
using System;
using System.Threading;
using System.Threading.Tasks;
namespace Pole.Core.Services
{
[Reentrant]
public class UtcUIDGrain : Grain, IUtcUID
{
int start_id = 1;
string start_string;
long start_long;
const int length = 19;
public UtcUIDGrain()
{
start_string = DateTimeOffset.UtcNow.ToString("yyyyMMddHHmmss");
start_long = long.Parse(start_string);
}
public Task<string> NewID()
{
return Task.FromResult(GenerateUtcId());
string GenerateUtcId()
{
var now_string = DateTimeOffset.UtcNow.ToString("yyyyMMddHHmmss");
var now_Long = long.Parse(now_string);
if (now_Long > start_long)
{
Interlocked.Exchange(ref start_string, now_string);
Interlocked.Exchange(ref start_long, now_Long);
Interlocked.Exchange(ref start_id, 0);
}
var builder = new Span<char>(new char[length]);
var newTimes = Interlocked.Increment(ref start_id);
if (newTimes <= 99999)
{
start_string.AsSpan().CopyTo(builder);
var timesString = newTimes.ToString();
for (int i = start_string.Length; i < length - timesString.Length; i++)
{
builder[i] = '0';
}
var span = length - timesString.Length;
for (int i = span; i < length; i++)
{
builder[i] = timesString[i - span];
}
return builder.ToString();
}
else
{
return GenerateUtcId();
}
}
}
}
}