Hello,

I need to integrate a Java library that is used to collects lot's of runtime 
information about errors, failures, etc.
It has many data collectors. There may be better ways to do this but I need to 
use this library for current projects.

The collectors should exist once per JVM (we are not using Akka cluster right 
now). If the JVM crashes, the data can be lost.
Everything is in memory.

How would I use such a singleton in the best way within an Akka/Spray service?

I had the following ideas:

1) Just use a global singleton and something like a getInstance method which 
can be called form everywhere incl. each actor

2) Hide the singleton within an actor as a private member. Create only one such 
Actor and pass it around. Send messages to that actor and translate the message 
to calls to the data collector. This is ugly as I have to pass around the actor.

3) Use a trait similar ActorLogging which I can add to each Actor that needs 
those collectors and guarantee within the trait that there is only once 
instance.



Are there any other options? Who has had to deal with a similar problem? Any 
recomendations for how to do this the Akka way?

The old Java applications just use Spring and Singleton scop but the Scala/Akka 
services don't use Spring.


Cheers,

Markus

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