aeron-archive/src/main/java/io/aeron/archive/client/ControlResponsePoller.java
public int poll()
    {
        controlSessionId = -1;
        correlationId = -1;
        relevantId = -1;
        templateId = -1;
        errorMessage = null;
        pollComplete = false;

        return subscription.controlledPoll(fragmentAssembler, fragmentLimit);
    }
public int poll()
    {
        controlSessionId = -1;
        correlationId = -1;
        relevantId = -1;
        templateId = -1;
        errorMessage = null;
        pollComplete = false;

        return subscription.controlledPoll(fragmentAssembler, fragmentLimit);
    }
Poll for control response events.

@return the number of fragments read during the operation. Zero if no events are available.