Hooks

Hook<FastInventoryBeforeOpenEvent> hook = event -> {
    System.out.println("Hook called before opening the inventory");
};

public class CustomInventoryDescriptor implements InventoryDescriptor {
    
    ...
    
    @Override
    public void addHooks(HookManager manager) {

        manager.addHook("before-open", FastInventoryBeforeOpenEvent.class, event -> {
            System.out.println("Hook called before opening the inventory.");
        });

        manager.addHook("after-open", FastInventoryAfterOpenEvent.class, event -> {
            System.out.println("Hook called after the inventory has been opened.");
        });

        manager.addHook("close", FastInventoryCloseEvent.class, event -> {
            System.out.println("Hook called when the inventory is closed.");
        });

        manager.addHook("click", FastInventoryClickEvent.class, event -> {
            System.out.println("Hook called when the inventory viewer clicks on an item in the inventory.");
        });
    }
    
    ...

}