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using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;
namespace System.Workflow.Runtime
{
internal class DbRetry
{
private const short _defaultMaxRetries = 20;
private const int _defaultRetrySleep = 2000;
private const short _spinCount = 3;
private short _maxRetries = _defaultMaxRetries;
private int _retrySleep = _defaultRetrySleep;
private bool _enableRetries = false;
protected DbRetry()
{
}
internal DbRetry(bool enableRetries)
{
_enableRetries = enableRetries;
}
internal short MaxRetries
{
get { return _maxRetries; }
}
internal bool TryDoRetry(ref short retryCount)
{
if (CanRetry(retryCount++))
{
RetrySleep(retryCount);
return true;
}
else
return false;
}
internal bool CanRetry(short retryCount)
{
if (!_enableRetries)
return false;
if (retryCount < _maxRetries)
return true;
else
return false;
}
internal void RetrySleep(short retryCount)
{
//
// For the first couple of retries just spin
// If we fail _spinCount times start then introduce a sleep
if (retryCount <= _spinCount)
return;
int sleep = _retrySleep * retryCount;
Thread.Sleep(sleep);
}
}
}
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