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Is the new KieSession thread safe?

We used Drools kieSessions in our project. Many threads can create new kieSessions. Sometimes the thread can hang while creating a session. Hence the question:

Firstly,

  • is kieContainer.newKieSession safe operation?
  • Could the reason for the hang be dirty writing or reading a collection of kie sessions or something like that?
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2 answers


As I tested in practice

newKieSession


does not work in streaming mode.

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I couldn't find any explicit instruction in the descent documentation, but I understand that it KieContainer

is thread safe and even smart enough to (somewhat quietly / magically) update itself (or rather the KieBases it contains).

I think that all methods for all practical purposes (debugging / source code reading) KieContainer.newStatelessKieSession()

and KieContainer.newKieSession()

are thread safe.



I'm not 100% sure about the methods updateToVersion()

and updateDependencyToVersion()

and whether I change the kie container through those that work in parallel with the methods KieContainer.newStatelessKieSession()

and newKieSession()

.

In our application, we managed to separate the logic for changing your rules (and modules, bases, sessions and their configuration) from the rule evaluation (which uses methods newKieSession

, etc.), and so far everything seems fine, but I would like to understand how you came to concluding that it is not thread safe.

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