Create a new subscription.
First subscription is connected.
Create a new subscription.
The changed number of connected subscription is 1 and current number of connected subscription is 2.
Destroy a subscription.
The changed number of connected subscription is -1 and current number of connected subscription is 1.
Destroy a subscription.
Last subscription is disconnected.
Create a new publisher.
First publisher is connected.
Create a new publisher.
The changed number of connected publisher is 1 and current number of connected publisher is 2.
Destroy a publisher.
The changed number of connected publisher is -1 and current number of connected publisher is 1.
Destroy a publisher.
Last publisher is disconnected.