public static async Task InvokeAsync(RetryPolicy retryPolicy, Action action)
{
if (action == null)
{
throw new ArgumentNullException(nameof(action));
}
if (retryPolicy == null)
{
throw new ArgumentNullException(nameof(retryPolicy));
}
var session = new RetrySession(retryPolicy);
session.Begin();
Exception exception = null;
var complete = false;
while (!complete)
{
try
{
action();
complete = true;
}
//todo: test if the three catch methods are required to correctly resolve the exception.
catch (TargetInvocationException ex)
{
exception = ex.GetPrimaryException();
}
catch (AggregateException ex)
{
exception = ex.GetPrimaryException();
}
catch (Exception ex)
{
exception = ex.GetPrimaryException();
}
// test the exception for can retry, exceeded max retry, and timeout
if (exception != null)
{
var retryException = session.CheckException(exception);
if (retryException != null)
{
Debug.WriteLine($"{nameof(WithRetry)}.{nameof(InvokeAsync)} encountered exception '{exception.GetType().Name}' with message '{exception.Message}' - CAN'T RETRY");
throw retryException;
}
// wait a bit before trying again
Debug.WriteLine($"{nameof(WithRetry)}.{nameof(InvokeAsync)} encountered exception '{exception.GetType().Name}' with message '{exception.Message}' - CAN RETRY AFTER SLEEP");
await session.SleepAsync();
//reset exception for next attempt
exception = null;
}
} // while (!complete)
}
protected override object Invoke(MethodInfo targetMethod, object[] args)
{
object result = null;
var session = new RetrySession(_retryPolicy)
.Begin();
Exception exception = null;
var complete = false;
while (!complete)
{
try
{
var isAwaitable = targetMethod.ReturnType.GetMethod(nameof(Task.GetAwaiter)) != null;
result = isAwaitable ? InvokeAsynchronous(targetMethod, args) : InvokeSynchronous(targetMethod, args);
//result = targetMethod.Invoke(_instance, args);
complete = true;
}
catch (TargetInvocationException ex)
{
exception = ex.GetPrimaryException();
}
catch (AggregateException ex)
{
exception = ex.GetPrimaryException();
}
catch (Exception ex)
{
throw new RetryException(session, $"Unexpected exception type '{ex.GetType().FullName}'. See inner exception for details.", ex);
}
// test the exception for can retry, exceeded max retry, and timeout
if (exception != null)
{
var retryException = session.CheckException(exception);
if (retryException != null)
{
throw retryException;
}
// wait a bit before trying again
session.Sleep();
//reset exception for next attempt
exception = null;
}
} // while (!complete)
session.End();
return(result);
}
public RetryException(RetrySession retrySession) : base()
{
RetrySession = retrySession ?? throw new ArgumentNullException(nameof(retrySession));
RetrySession.End();
}
public ExceededMaxWaitTimeException(RetrySession retrySession, RetryPolicy retryPolicy, Exception innerException) : base(retrySession, retryPolicy, innerException)
{
}
public ExceededMaxWaitTimeException(RetrySession retrySession, RetryPolicy retryPolicy) : base(retrySession, retryPolicy)
{
}
public ExceededMaxAttemptsException(RetrySession retrySession, RetryPolicy retryPolicy, Exception innerException) : base(retrySession, retryPolicy, innerException)
{
}
public ExceededMaxAttemptsException(RetrySession retrySession, RetryPolicy retryPolicy) : base(retrySession, retryPolicy)
{
}
public RetryNotAllowedException(RetrySession retrySession, RetryPolicy retryPolicy, Exception innerException) : base(retrySession, innerException)
{
RetryPolicy = retryPolicy ?? throw new ArgumentNullException(nameof(retryPolicy));
}
public RetryException(RetrySession retrySession, Exception innerException) : this(retrySession, string.Empty, innerException)
{
}
public RetryException(RetrySession retrySession, string message, Exception innerException) : base(message, innerException)
{
RetrySession = retrySession ?? throw new ArgumentNullException(nameof(retrySession));
RetrySession.End();
}
internal RetrySession(RetrySession retrySession) : this(retrySession._retryPolicy)
{
Attempts = retrySession.Attempts;
ElapsedTime = TimeSpan.FromTicks(retrySession.ElapsedTime.Ticks);
Exceptions.AddRange(retrySession.Exceptions);
}