------=_Part_22230002_1751095465.1384256418493 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Forwarding this email to engine-devel so that backend maintainers are aware of this issue. Looking at the code: - MultipleActionsRunner#Execute first creates and "validates" all commands: A. the "for" block which iterates over getParameters() 1-> validate correlation ID, if OK create and add command, otherwise add returnValue B the "if" block which tests getCommands().size() 1-> if single command to execute, add its "canDoActionOnly" returnValue, which is returnValue with canDoAction but without actual result object 2-> if multi commands to execute, execute chunks of max. 10 threads (sequentially, ThreadPoolUtil.invokeAll returns after all threads complete), same returnValue as above C. the "if" block which tests canRunActions 1-> all commands are executed within SINGLE THREAD due to ThreadPoolUtil.execute(Runnable), which is kind of weird comapred to how returnValues are prepared (see B2) 2-> when executing command, code DOES NOT CARE about its returnValue, i.e. returnValue was already prepared (see B) and command execution should just update it The problem (I think) is that C1 starts a different thread (to execute all commands) and immediately returns, i.e. code doesn't wait for thread to complete. This is why returnValues are observed on frontend as inconsistent. Additionally, we're also mixing of two different things: canDoAction processing and returnValues processing. IMHO this should be refactored to make code easier to read. Changes done by Alex (patch attached): X1. returnValues changed to Collections.synchronizedList -> this means all access to returnValues is now serial -> iteration over synchronizedList should also be enclosed in "synchronized (list)" block, so this: for (VdcReturnValueBase value : returnValues) ... should be this: synchronized (returnValues) { for (VdcReturnValueBase value : returnValues) ... } X2. commented-out original command execution via ThreadPoolUtil.execute(Runnable) -> new RunCommands method invokes all commands each in separate thread via ThreadPoolUtil.invokeAll -> returnValues list is explicitly updated Guys, what do you think? Vojtech ----- Original Message ----- ------=_Part_22230002_1751095465.1384256418493 Content-Type: text/x-patch; name=thread_wait.patch Content-Disposition: attachment; filename=thread_wait.patch Content-Transfer-Encoding: base64 ZGlmZiAtLWdpdCBhL2JhY2tlbmQvbWFuYWdlci9tb2R1bGVzL2JsbC9zcmMvbWFpbi9qYXZhL29y Zy9vdmlydC9lbmdpbmUvY29yZS9ibGwvTXVsdGlwbGVBY3Rpb25zUnVubmVyLmphdmEgYi9iYWNr ZW5kL21hbmFnZXIvbW9kdWxlcy9ibGwvc3JjL21haW4vamF2YS9vcmcvb3ZpcnQvZW5naW5lL2Nv cmUvYmxsL011bHRpcGxlQWN0aW9uc1J1bm5lci5qYXZhDQppbmRleCBhNzJmYmQ5Li4xYjRmNGRh IDEwMDY0NA0KLS0tIGEvYmFja2VuZC9tYW5hZ2VyL21vZHVsZXMvYmxsL3NyYy9tYWluL2phdmEv b3JnL292aXJ0L2VuZ2luZS9jb3JlL2JsbC9NdWx0aXBsZUFjdGlvbnNSdW5uZXIuamF2YQ0KKysr IGIvYmFja2VuZC9tYW5hZ2VyL21vZHVsZXMvYmxsL3NyYy9tYWluL2phdmEvb3JnL292aXJ0L2Vu Z2luZS9jb3JlL2JsbC9NdWx0aXBsZUFjdGlvbnNSdW5uZXIuamF2YQ0KQEAgLTEsNiArMSw3IEBA DQogcGFja2FnZSBvcmcub3ZpcnQuZW5naW5lLmNvcmUuYmxsOw0KIA0KIGltcG9ydCBqYXZhLnV0 aWwuQXJyYXlMaXN0Ow0KK2ltcG9ydCBqYXZhLnV0aWwuQ29sbGVjdGlvbnM7DQogaW1wb3J0IGph 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