code: protected void setProbeListeners(ProbeImpl probe, Collection<ProbeListener> listeners) {
          Set<ProbeListener> enabled = enabledProbes.get(probe);
          if (enabled == null) {
              enabled = new HashSet<ProbeListener>();
              enabledProbes.put(probe, enabled);
          }
          enabled.addAll(listeners);
      }
docs: Associate a collection of listeners with the specified probe.
  
  @param probe the injected probe
  @param listeners the listeners that will receive events from the
  injected probe