[jboss-dev-forums] [Design the new POJO MicroContainer] - Re: Install Items

[adrian@jboss.org]

You still don't understand.

The callback is a generic thing.

It's also an implementation detail handled internally by the controller,
so you don't need anything on the controller itself.

e.g. something like


  | public interface InstallItem<T>
  | {
  |    ControllerState whenRequired();
  |    ControllerState requiredState();
  |    int getCardinality();
  |    Class<T> getItemType();
  | }
  | 
  | public interface SingleInstallItem<T> extends InstallItem<T>
  | {
  |    add(T item);
  |   remove(T item);
  | }
  | 
  | 
  | public interface CollectionInstallItem<T> extends InstallItem<T>
  | {
  |    set(Collection<? extends T> items);
  | }
  | 

And then in the controller (pseudo code):


  | protected void install(ControllerContext context, ControllerState toState)
  | {
  |    // do it (what it does now)
  | 
  |   Collection<InstallItem> installs = context.getDependencyInfo().getInstallItems();
  |   if (installs != null && installs.isEmpty() == false)
  |   {
  |        for (InstallItem install : installs)
  |        {
  |           if (install.getWhenRequired().equals(toState)
  |           {
  |               addToIndex(install.getItemItype(), install);
  |               // also install what already exists
  |           }
  |        }
  |   }
  | 
  |   Collection<Class<?> implements = getClassesImplemented(context.getTarget());
  |   if (implements != null && implements.isEmpty() == false)
  |   {
  |        for (Class implement : implements)
  |        {
  |           Set<InstallItem> installs = getFromIndex(implement);
  |           // Do the installs if we are at the required state
  |           {
  |             //  eventually leading to something like
  |             InstallItem install = // from installs
  |             if (toState.equals(install.getRequiredState))
  |                install.add(context.getTarget());
  |           }
  |        }
  |   }
  | }
  | 

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