/**
* Updates the output meter.
*
* <p>Stages that want to meter their output must call this each time an event is output.
*/
protected void afterOnNext() {
outMeter.mark(1);
}
/**
* Updates the input meter.
*
* <p>Stages that want to meter their input must call this each time an event is input.
*/
protected void beforeOnNext() {
inMeter.mark(1);
}