NYBus | sub library for Android and Java applications | Reactive Programming library

I'm writing a listener for messages using the Rx framework.

The problem I'm facing is that the library I'm using uses a consumer that publishes events whenever a message has arrived.

I've managed to consume the incoming messages via Observable.FromEventPattern but I have a problem with the messages that are already in the server.

At the moment I have the following chain of commands

1. Create a consumer
2. Create an observable sequence with FromEventPattern and apply needed transformations
3. Tell the consumer to start
4. Subscribe to the sequence

The easiest solution would be to swap steps 3. and 4. but since they happen in different components of the system, it's very hard for me to do so.

Ideally I would like to execute step 3 when step 4 happens (like a OnSubscribe method).

Thanks for your help :)

PS: to add more details, the events are coming from a RabbitMQ queue and I am using the EventingBasicConsumer class found in the RabbitMQ.Client package.

Here you can find the library I am working on. Specifically, this is the class/method giving me problems.

Edit

Here is a stripped version of the problematic code