Examples of org.jvnet.hk2.component.RunLevelService

org.jvnet.hk2.component.InhabitantListener
Implementations of this contract are responsible for orchestration lifecycle events (i.e., start levels) in Hk2.
Each resident run level service is responsible for a particular class of RunLevel that is identified by an environment value.
Implementations of this service are responsible for orchestrating lifecycle events for services annotated with RunLevel. This consists of inhabitant activations (i.e., get) and deactivations (i.e., release).
The default RunLevelService uses T==Void.class, and is registered in the habitat with the name "default" and is the primary service instance responsible for the "platform".
Third parties (or otherwise any sub-component) may choose to define other implementation variations of this contract for other specific needs.
RunLevelServices are special in that they are constructed early on in habitat creation lifecycle. As a result, they should not rely on the Habitat being fully initialized in any PostConstruct call. Alternatively, they should implement HabitatListener, and wait for a habitat initialization event before doing any initialization work.
Each implementation of the RunLevelService may vary, but in general it is encouraged that the implementation use habitat resident {@link RunLevelListener}(s) for event notification, habitat resident {@link InhabitantSorter}(s) for arranging the order of inhabitants to be activated at a given {@link RunLevel}, and finally habitat resident {@link InhabitantActivator}(s) for the activation (i.e. get) and deactivation (i.e., release) of the sorted inhabitants. @see DefaultRunLevelService @see RunLevelListener @see InhabitantSorter @see InhabitantActivator @author Jeff Trent @since 3.1

                Type genericType,
                Class<V> type) throws ComponentException {
        Inhabitant<?> lead = onBehalfOf.lead();
        if (lead==null) {
            // TODO: we should be able to check this error at APT, too.
            throw new ComponentException(component.getClass()+" requested @Lead injection but this is not a companion");
        }
        
        if(type==Inhabitant.class) {
            return type.cast(lead);
        }

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    public T create(Inhabitant onBehalfOf) throws ComponentException {
        try {
            return type.newInstance();
        } catch (InstantiationException e) {
            throw new ComponentException("Failed to create "+type,e);
        } catch (IllegalAccessException e) {
            throw new ComponentException("Failed to create "+type,e);
        } catch (LinkageError e) {
            throw new ComponentException("Failed to create "+type,e);
        } catch (RuntimeException e) {
            throw new ComponentException("Failed to create "+type,e);
        }
    }

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      }
  
      // other general case
      Scope scope = habitat.getByType(scopeClass);
      if (scope==null) {
          throw new ComponentException("Failed to look up %s", scopeClass);
      }
  
      return new ScopedInhabitant<T>(creator,scope);
  }

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  static void validate(Object target, Object injectedVal) {
      if (null != injectedVal) {
          RunLevel targetRL = AbstractInhabitantImpl.getAnnotation(target.getClass(), RunLevel.class, false);
          RunLevel injectedValRL = AbstractInhabitantImpl.getAnnotation(injectedVal.getClass(), RunLevel.class, false);
          if (null == targetRL && null != injectedValRL) {
              throw new ComponentException("invalid dependency from a non-RunLevel instance " +
                  target + " to a RunLevel instance " + injectedVal);
        }
    }
  }

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      Integer planned = state.getPlannedRunLevel();
      planned = (null == planned) ? DefaultRunLevelService.KERNEL_RUNLEVEL : planned;
      Integer current = state.getCurrentRunLevel();
      current = (null == current) ? DefaultRunLevelService.KERNEL_RUNLEVEL : current;
      if (null == planned || runLevel > planned || runLevel > current + 1) {
        throw new ComponentException("unable to activate " + this + "; minimum expected RunLevel is: " + runLevel +
            "; planned is: " + planned + "; current is: " + current);
      }
    }
  }

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    public WonderlandAppServer(Server server) {
        this.server = server;


        // add a module to properly specify the classpath
        Habitat h = server.getHabitat();
        ModulesRegistry mr = h.getComponent(ModulesRegistry.class);
        mr.add(new ClasspathModuleDefinition(WebServerLauncher.getClassLoader()));
    }

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    public Habitat createHabitat() throws ComponentException {
        if (null != habitatFactory) {
          return habitatFactory.newHabitat();
        }
        
        return new Habitat(); 
    }

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            if (replacements.containsKey(typeName)) {
                // create a replacement instead
                Class<?> target = replacements.get(typeName);
                if(target!=null) {
                    inhabitantParser.setImplName(target.getName());
                    Inhabitant i = null;
                    try {
                      i = Inhabitants.create(target,habitat,inhabitantParser.getMetaData());
                    } catch (Exception e) {
                      log(typeName, e);
                    }

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      assert(null != rl) : typeName + " is a problem; " + i + " has no RunLevel annotation";
      assert(!i.isInstantiated()) : "inhabitant should not be active: " + i;


      // get the appropriate RLS for this RunLevel
      RunLevelService<?> rls = runLevelServices.get(habitat, rl);
      InhabitantListener listener = InhabitantListener.class.isInstance(rls) ?
          InhabitantListener.class.cast(rls) : null;


      // wrap the inhabitant with a RunLevelInhabitant
      int runLevel = rl.value();

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  protected void notify(InhabitantListener.EventType eventType) {
    if (null != listeners) {
      Iterator<InhabitantListener> iter = listeners.iterator();
      while (iter.hasNext()) {
        InhabitantListener listener = iter.next();
        try {
          boolean keepListening = listener.inhabitantChanged(eventType, this);
          if (!keepListening) {
            removeInhabitantListener(listener);
          }
        } catch (Exception e) {
          // don't percolate the exception since it may negatively impact processing

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