41 lines
1.3 KiB
C#
41 lines
1.3 KiB
C#
//-----------------------------------------------------------------------------
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//-----------------------------------------------------------------------------
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namespace System.Activities.DurableInstancing
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{
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using System;
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class LoadRetryExponentialBackoffStrategy : ILoadRetryStrategy
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{
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readonly TimeSpan DefaultBackoffLimit = TimeSpan.FromSeconds(10);
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readonly TimeSpan DefaultBackoffMultiplier = TimeSpan.FromMilliseconds(100);
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readonly int expLimit = (int)(Math.Log(Int32.MaxValue, 2)) - 1;
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readonly TimeSpan multiplier;
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readonly TimeSpan maxDelay;
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Random random = new Random(DateTime.Now.Millisecond);
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public LoadRetryExponentialBackoffStrategy()
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{
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this.multiplier = DefaultBackoffMultiplier;
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this.maxDelay = DefaultBackoffLimit;
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}
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public TimeSpan RetryDelay(int retryAttempt)
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{
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int power = Math.Min(retryAttempt, this.expLimit);
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return TimeSpan.FromMilliseconds
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(
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Math.Min
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(
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this.maxDelay.TotalMilliseconds,
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this.multiplier.TotalMilliseconds * random.Next(1, ((2 << power) - 1))
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)
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);
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}
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}
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}
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