Hi,
I would like to implement an application wide retry system for all entity SaveChanges method calls.
Technologies:
Entity framework 4.0
.Net 4.0
namespace Sample.Data.Store.Entities {
public partial class StoreDB
{
public override int SaveChanges(System.Data.Objects.SaveOptions options)
{
for (Int32 attempt = 1; ; )
{
try
{
return base.SaveChanges(options);
}
catch (SqlException sqlException)
{
// Increment Trys
attempt++;
// Find Maximum Trys
Int32 maxRetryCount = 5;
// Throw Error if we have reach the maximum number of retries
if (attempt == maxRetryCount)
throw;
// Determine if we should retry or abort.
if (!RetryLitmus(sqlException))
throw;
else
Thread.Sleep(ConnectionRetryWaitSeconds(attempt));
}
}
}
static Int32 ConnectionRetryWaitSeconds(Int32 attempt)
{
Int32 connectionRetryWaitSeconds = 2000;
// Backoff Throttling
connectionRetryWaitSeconds = connectionRetryWaitSeconds *
(Int32)Math.Pow(2, attempt);
return (connectionRetryWaitSeconds);
}
/// <summary>
/// Determine from the exception if the execution
/// of the
connection should Be attempted again
/// </summary>
/// <param name="exception">Generic Exception</param>
/// <returns>True if a a retry is needed, false if not</returns>
static Boolean RetryLitmus(SqlException sqlException)
{
switch (sqlException.Number)
{
// The service has encountered an error
// processing your request. Please try again.
// Error code %d.
case 40197:
// The service is currently busy. Retry
// the request after 10 seconds. Code: %d.
case 40501:
//A transport-level error has occurred when
// receiving results from the server. (provider:
// TCP Provider, error: 0 - An established
connection
// was aborted by the software in your host machine.)
case 10053:
return (true);
}
return (false);
}
}
}
The problem:
How can I run the StoreDB.SaveChanges to retry on a new DB context after an error occured?
Something simular to Detach/Attach might come in handy.
Thanks in advance!
Bart
