/// <summary>
/// Executes the specified operation with the specified retry policy.
/// </summary>
/// <typeparam name="T">Returns an arbitrary type.</typeparam>
/// <param name="function">The function to execute.</param>
/// <param name="policy">The retry policy to apply to the function.</param>
/// <param name="context">The abstraction context to use.</param>
/// <param name="logger">An ILogger object to log retry attempts.</param>
/// <returns>
/// Returns the value received from the execution of the function.
/// </returns>
public static async Task <OperationExecutionResult <T> > ExecuteOperationWithRetry <T>(Func <Task <T> > function, IRetryPolicy policy, IAbstractionContext context, ILogger logger)
{
Stopwatch stopwatch = new Stopwatch();
stopwatch.Start();
for (int attempt = 0; attempt < policy.MaxAttemptCount;)
{
try
{
if (attempt > 0)
{
logger.LogMessage(string.Format(CultureInfo.InvariantCulture, "\r\nRetrying Operation because previous attempt resulted in error. Current Retry attempt: {0}\r\n\r\n", attempt),
Severity.Informational,
Verbosity.Detailed);
}
context.CancellationToken.ThrowIfCancellationRequested();
T result = await function();
attempt++;
return(new OperationExecutionResult <T>(result, stopwatch.Elapsed, attempt));
}
catch (Exception e)
{
attempt++;
var retryParams = policy.GetRetryParameters(attempt, e);
//Log
if (retryParams.ShouldRetry)
{
context.CancellationToken.WaitForInterval(retryParams.WaitTime);
}
else
{
logger.LogMessage(string.Format(CultureInfo.InvariantCulture, "\r\nOperation attempt failed because of the following error:: {0}\r\n\r\n", e.Message),
Severity.Informational,
Verbosity.Detailed);
return(new OperationExecutionResult <T>(e, stopwatch.Elapsed, attempt));
}
}
}
throw new InvalidOperationException("Should not reach here. Bug in retry policy implementation");
}