Function pulsar_sys::pulsar_reader_configuration_set_reader_listener

pub unsafe extern "C" fn pulsar_reader_configuration_set_reader_listener(
    configuration: *mut pulsar_reader_configuration_t, 
    listener: pulsar_reader_listener, 
    ctx: *mut c_void
)

A message listener enables your application to configure how to process messages. A listener will be called in order for every message received.