javascript - Angularjs chaining promises: propagation of notify vs resolve -

i trying chain 3 promises. find if resolve promise1, result in promise2's success callback , can control what , if need send promise3.
if issue notify in promise1, not matter in promise2, promise3's notifycallback triggered immediately. how can prevent , make conditional based on business rules in promise2 ?

here simple example in jsfiddle: http://jsfiddle.net/deepfiddle/rxv8322s/

if issue .notify() instead of .resolve() (uncomment/comment line in promise1), see promise3 gets notified immediately. here relevant code:

var myapp = angular.module('myapp', []);  myapp.controller('myctrl', function($scope, $q, $timeout) { console.log("--app controller");  var p0 = $q.when(); p0 .then( //promise: p1     function(result) {         console.log("p1", result);         var deferred = $q.defer();         $timeout(function() {             console.log("in timeout of p1");             //note1: propagation of resolve can controlled not notify             //       uncomment notify instead see difference on console             deferred.resolve("p1 resolved timeout 2000");             //deferred.notify("p1 notified timeout 2000");         }, 2000);         return deferred.promise;     } ) .then(//promise: p2     function(result) {         console.log("p2-onsuccess:", result);         var deferred = $q.defer();          $timeout(function() {             console.log("in timeout of p2");             deferred.resolve("p2 resolved timeout 2000");         }, 2000);                    return deferred.promise;     },      null,     function(result) {         //note2: unable prevent propagation of p1.notify() p3         console.log("p2-onnotify:", result);         var deferred = $q.defer();         $timeout(function() {             console.log("in timeout of p2");             deferred.notify("p2 notified timeout 2000");         }, 2000);                     return deferred.promise;     } ) .then(//promise:p3     function(result) {         console.log("p3-onsuccess:", result);     },     null,     function(result) {         console.log("p3-onnotify:", result);                 } ) });