Hi,

Assuming I have an actor which hold a map M

And I will possibly do:

1, send message A to the actor
2. send message B to the actor


When receiving messages,  A will possibly be executed in thread 1 and B 
will possibly be executed in thread 2.
Although A is triggered earlier than B ( sequence delivery is for sure), 
but B might be finished executing prior to A, right?


Assuming in the receive method, I'll try to do something like "find an 
entry from the map M, if not exist, then create one".

Will I see any possible concurrent issues? should I use a thread safe map 
impl like TrieMap or ConcurrentHashMap to make sure the put operation is 
atomic like putIfAbsent?



Thanks

Leon




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