Groovy components coming in grails 3 plugin

gistfile1.groovy

//Define your component in a groovy class
package foo.bar

class Counter {
    static renderAfter = ['inc', 'dec']
    static style = 'button { background-color: red; }'
    
    int value = 0
    void inc() {
        value++
    }
    void dec() {
        value--
    }
    void render() { //Markup template engine
        h1 value.toString()
        p {
            button(onclick: 'dec', '-')
            button(onclick: 'inc', '+')
        }
    }
}

//Add to your gsp's with:
<grooscript:component src='foo.bar.Counter'/>

//And then use in your gsp
<counter></counter>
<counter value="5"></counter>

//Not using implementations as React or Polymer. Just using custom components and shadow dom (http://webcomponents.org/)
//The idea, is the component renders when you change something visual or important