How to handle race condition in Observable.java?

[ilyash-b]

https://github.com/eclipse-dataspaceconnector/DataSpaceConnector/blob/84bb9597b4ed18ad177fe82e475661a53000d762/spi/src/main/java/org/eclipse/dataspaceconnector/spi/Observable.java#L35-L36

Imagine two threads registering same listener. Both get into if, then both register.

Not 100% sure. Can somebody take a look?

[jimmarino]

This would likely not happen:

(1) Runtime bootstrap is single-threaded

(2) If a listener was registered after runtime boot, the same object instance would need to be registered from two different threads, which would have to be intentionally done (since it is the same object instance or a poor implementation of .equals()).