I suggest you make use of a saga and Rebus' timeout service to implement a retry strategy that fits your needs. This way, in your Rebus-enabled web service facade, you could do something like this:
public void Handle(TryMakeWebServiceCall message)
{
try
{
var result = client.MakeWebServiceCall(whatever);
bus.Reply(new ResponseWithTheResult{ ... });
}
catch(Exception e)
{
Data.FailedAttempts++;
if (Data.FailedAttempts < 10)
{
bus.Defer(TimeSpan.FromSeconds(1), message);
return;
}
// oh no! we failed 10 times... this is probably where we'd
// go and do something like this:
emailService.NotifyAdministrator("Something went wrong!");
}
}
where Data
is the saga data that is made magically available to you and persisted between calls.
For inspiration on how to create a saga, check out the wiki page on coordinating stuff that happens over time where you can see an example on how a service might have some state (i.e. number of failed attempts in your case) stored locally that is made available between handling messages.
When the time comes to make bus.Defer
work, you have two options: 1) use an external timeout service (which I usually have installed one of on each server), or 2) just use "yourself" as a timeout service.
At configuration time, you go
Configure.With(...)
.(...)
.Timeouts(t => // configure it here)
where you can either StoreInMemory
, StoreInSqlServer
, StoreInMongoDb
, StoreInRavenDb
, or UseExternalTimeoutManager
.
If you choose (1), you need to check out the Rebus code and build Rebus.Timeout yourself - it's basically just a configurable, Topshelf-enabled console application that has a Rebus endpoint inside.
Please let me know if you need more help making this work - bus.Defer
is where your system becomes awesome, and will be capable of overcoming all of the little glitches that make all others' go down :)