Applications

Reboot applications are defined using an instance of Application, and launched from the file configured as your --application in .rbtrc.

Application

Your entrypoint will construct an Application and then run it:

Python

async def main():
    await Application(
        servicers=[HelloServicer],
        initialize=initialize,
    ).run()


if __name__ == '__main__':
    asyncio.run(main())

TypeScript

new Application({
  servicers: [HelloServicer],
  initialize,
}).run();

initialize functions

The optional initialize argument to the Application constructor is a function that runs every time your application starts up.

Initializers can be used to create any initial state that your application needs. In particular, they are usually where any singleton states used by your application are created.

Python

async def initialize(context: InitializeContext):
    hello = Hello.ref(EXAMPLE_STATE_MACHINE_ID)

    # Implicitly construct state machine upon first write.
    await hello.Send(
        context,
        message="Hello, World!",
    )

TypeScript

const initialize = async (context) => {
  const hello = Hello.ref("hello-nodejs");
  await hello.send(context, { message: "Hello, World!" });
};

If you have declared an initialize function, then you can additionally pass an initialize_bearer_token (initializeBearerToken in TypeScript) which the initialize method should use to authenticate itself to your application.