OneToThreeDiamondSequencedThroughputTest event data structure usage clarification

[Dmitry Zagorulkin]

Hello folks!

I'm trying to understand does is safe to use consecutive data structure (List, Map) in diamond like scenario? 

*           +-----+
*    +----->| EP1 |------+
*    |      +-----+      |
*    |                   v
* +----+              +-----+
* | P1 |              | EP3 |
* +----+              +-----+
*    |                   ^
*    |      +-----+      |
*    +----->| EP2 |------+
*           +-----+

When P1 produces some data e.g., List then EP1 and EP2 adds to this list something. Does it possible to get ConcurrentModificationException? 

Should i use any concurrent data structure for this purpose? 

[Olivier Coanet]

Hello.

It would not be thread-safe to add elements to the list from both EP1 and EP2. You could use a concurrent list, but in my view it would be simpler to produce data in two distinct lists, and then process those lists in EP3.

I hope this will help.

[Dmitry Zagorulkin]

Thank you, Olivier.

It really helps.