string|array argument(string $key = null) Get the value of a command argument

void error(string $string) Write a string as error output.

void question(string $string) Write a string as question output.

bool isDeletedOrReleased() Determine if the job has been deleted or released

void error(string $string, null|int|string $verbosity = null) Write a string

int callSilent(string $command, array $arguments = array()) Call another

void warn(string $string, null|int|string $verbosity = null) Write a string

int run(InputInterface $input, OutputInterface $output) Run the console

SubscribeCommand deprecated class SubscribeCommand extends

void release(int $delay) Release the job back into the queue.