/// <summary>
/// Retry a function n times or until successful.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="function"></param>
/// <param name="config"></param>
/// <returns></returns>
static RetryResult <T> RetryFunc <T>(Func <T> function, RetryConfig config)
{
var retryInfo = new RetryInfo();
var result = new RetryResult <T>(default(T), retryInfo);
var isOk = false;
var retriesRemaining = config.MaxRetries;
var timeoutAt = DateTime.Now.Add(config.TotalTimeout);
bool hasTimeout = config.HasTimeout;
while (!isOk && (retriesRemaining >= 0 || config.RetryForever) &&
(!hasTimeout || (config.HasTimeout && DateTime.Now < timeoutAt)))
{
result.RetryInfo.Executions++;
try
{
result.Result = function();
isOk = true;
}
catch (Exception ex)
{
result.RetryInfo.Exceptions.Add(ex);
// Wait before retrying.
if (config.WaitBetweenRetries > TimeSpan.Zero)
{
Thread.Sleep(config.WaitBetweenRetries);
}
}
retriesRemaining--;
}
return(result);
}
/// <summary>
/// Configure a maximum retry time.
/// </summary>
/// <returns>The after.</returns>
/// <param name="retryConfig">Retry config.</param>
/// <param name="timeout">Timeout.</param>
public static RetryConfig TimeoutAfter(this RetryConfig retryConfig, TimeSpan timeout)
{
retryConfig.TotalTimeout = timeout;
return(retryConfig);
}
/// <summary>
/// Retry until it's succesful.
/// </summary>
/// <param name="retryConfig"></param>
/// <returns></returns>
public static RetryConfig RetryUntilSuccessful(this RetryConfig retryConfig)
{
retryConfig.RetryForever = true;
return(retryConfig);
}
/// <summary>
/// Specify the number of retries.
/// </summary>
/// <param name="retryConfig"></param>
/// <param name="retries"></param>
/// <returns></returns>
public static RetryConfig WithNumberOfRetries(this RetryConfig retryConfig, int retries)
{
retryConfig.MaxRetries = retries;
return(retryConfig);
}
/// <summary>
/// Wait command for an specified timespan duration between retries.
/// </summary>
/// <param name="retryConfig"></param>
/// <param name="wait"></param>
/// <returns></returns>
public static RetryConfig WithWaitOf(this RetryConfig retryConfig, TimeSpan wait)
{
retryConfig.WaitBetweenRetries = wait;
return(retryConfig);
}
/// <summary>
/// Wait command n milliseconds between retries.
/// </summary>
/// <param name="retryConfig"></param>
/// <param name="msWait"></param>
/// <returns></returns>
public static RetryConfig WithMsWaitOf(this RetryConfig retryConfig, int msWait)
{
retryConfig.WaitBetweenRetries = TimeSpan.FromMilliseconds(msWait);
return(retryConfig);
}
/// <summary>
/// Initialize the retrier.
/// </summary>
/// <param name="retryConfig"></param>
public static RetryConfig Init(RetryConfig retryConfig)
{
return(retryConfig);
}
