Service components using lax

gistfile1.txt

<aura:component controller="FooService">
    <c:lax context="{!this}" />
    <aura:method name="getByAppName">
        <aura:attribute name="AppName" type="string" />
    </aura:method>
</aura:component>
({
    getByAppName : function(component, event, helper) {
        return component.lax.enqueue('c.GetByAppName', event.getParam('arguments'))
    }
})
<c:FooService aura:id="FooService" />
component
  .find("FooService")
  .getByAppName('baz')
  .then(helper.getSuccess.bind(null, component, helper))
  .then(helper.getFail.bind(null, component, helper))