Custom backends

apns-worker is designed to support pluggable backends that can implement different concurrency models. The default backend uses Python threads to manage connections, but it should be possible to implement other backends, such as one based on gevent. Note that this has not been tested, so there may still be some rough edges in the API.

To write your own backend, just subclass apns_worker.backend.base.Backend and fill in all of the abstract methods. The backend will be responsible for starting and stopping asynchronous network operations as well as providing queue synchronization, if necessary. apns_worker.backend.threaded.Backend can serve as a reference implementation.