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Is Parser generated by XText thread safe? [message #1763673]

Thu, 18 May 2017 09:28

Eclipse User

Hello, does anybody know - is the Parser, generated by XText, thread safe and reusable?

I have MyDslParser extends AbstractAntlrParser, so I create the instance like this:

MyDslParser parser = new MyDslParser ();
new DslStandaloneSetup()
     .createInjectorAndDoEMFRegistration()
     .injectMembers(parser);

Can I reuse this instance in many threads?

Re: Is Parser generated by XText thread safe? [message #1763907 is a reply to message #1763673]

Mon, 22 May 2017 14:46

Eclipse User

No it is not thread safe, since it is building an EMF AST and EMF itself is not thread safe.

Re: Is Parser generated by XText thread safe? [message #1763910 is a reply to message #1763907]

Mon, 22 May 2017 15:40

Eclipse User

Hi

EMF is thread safe provided you warm up properly and use it right.

What do you really want to do on multiple threads?

If you want a single parse wrapped up in an IUnitOfWork on an indeterminate thread, it should work, though I'd be inclined to serialize all parses through a dedicated Parser thread.

If you want to re-use the parser many times for independent parses on different threads, who knows? My instinct is that there is too much clever declarative stuff going on to be sure that caches are not going to evolve.

If you want to throw multiple threads at the parser to accelerate it. No chance.

Regards

Ed Willink

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