Initialize objects on different threads for flask server

Question

I am running a flask server and would like to initialize one complicated object for each thread at startup. The initialization is slow but only needs to be done once. After the initialization, speed is not an issue. The operations on the objects are no thread safe, but their contents do not change between requests.

How do I do something like this with flask? How can I perform an initialization task on a per thread basis (rather than a per request basis)?

Eugene Soldatov · Accepted Answer · 2015-02-02 10:07:39Z

1

You can store your object in memory. Flask app is right place for such objects, which you want to store.

class FlaskApp(Flask):

    def __init__(self, *args, **kwargs):
        super(FlaskApp, self).__init__(*args, **kwargs)
        self.complex_object = create_my_object()

app = FlaskApp(__name__)

if __name__ == '__main__':
    app.run(debug=True)

answered Feb 2, 2015 at 10:07

Eugene Soldatov

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2 Comments

hanno Over a year ago

But wouldn't that give me one object per app rather than one object per thread?

Eugene Soldatov Over a year ago

As I understand, each thread has one flask app instance. You can check it by printing something to the log on FlaskApp init.

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