Provide examples of Isolates i.e. don't do everything on the main thread

[Buggaboo]

TODO

• free datastructures when exiting
• message passing, e.g. ReceivePort, SendPort
• transactions, atomicity guarantee etc.

[vaind]

Also, we should have test cases covering this usecase to make sure the native interactions work as expected (e.g. transactions/locking)

[greenrobot]

For me as a Dart noob, it would be really interesting to see a minimal Isolate example. E.g. can we pass a Box into another Isolate? If so, we should be able to get some data objects there and copy those over into the main Isolate?

[Buggaboo]

I was playing with isolates here

It's not possible to pass around boxes, stores, or anything related to ffi.

The isolate can receive TestEntity objects, but vice versa the main terminates before receiving a TestEntity object from the isolate. I used to solve this with a completer, but since the isolate is in its own world...

[vaind]

OK, so the observers issue prompted me to look into this...

Yes, multiple isolates can be used, the changes necessary are very simple: just allow creating Store from an existing C-API OBX_Store pointer. I've done so in this PR draft: #145

[vaind]

implemented by #145