jill/src/main/java/io/github/agentsoz/jill/core/IntentionSelector.java
private void addActiveAgents() {
    synchronized (extToAdd) {
      if (!extToAdd.isEmpty()) {
        for (int i : extToAdd) {
          activeAgents.add(i);
        }
        extToAdd.clear();
      }
    }
  }
private void addActiveAgents() {
    synchronized (extToAdd) {
      if (!extToAdd.isEmpty()) {
        for (int i : extToAdd) {
          activeAgents.add(i);
        }
        extToAdd.clear();
      }
    }
  }
Adds to {@link #activeAgents} all agents flagged by external events as having become active.