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more experimenting with async APIs...

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Signed-off-by: Alex A. Naanou <alex.nanou@gmail.com>
This commit is contained in:
Alex A. Naanou 2016-10-01 08:27:17 +03:00
parent 9f37a2f3e2
commit dac806cbd1
1 changed files with 36 additions and 5 deletions
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41
pwiki.js
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@ -1064,11 +1064,28 @@ module.hiddenPromise = {
then: function(func){
var that = this
// trigger lazy functions if present...
if(this.__lazy != null){
var lazy = this.__lazy
delete this.__lazy
return this
.then(lazy)
.then(func)
// clear any lazy stuff queued by the above to avoid any
// side-effects...
delete this.__lazy
}
// no promise...
if(this.__promise == null){
this.__promise = new Promise(function(resolve, reject){
resolve(func.call(that))
})
// existing promise...
} else {
this.__promise = this.__promise.then(function(){
return func.apply(that, [].slice.call(arguments))
@ -1077,6 +1094,18 @@ module.hiddenPromise = {
return this
},
// Like then, but the function will get called only if a .then(..) is
// called right after...
//
// NOTE: only the last lazy function is stored, the rest are discarded.
lazy: function(func){
this.__lazy = func
return this
},
clearLazy: function(){
delete this.__lazy
return this
},
// example method (sync)...
//
@ -1101,13 +1130,12 @@ module.hiddenPromise = {
// .data()
// .then(function(value){ console.log(value) })
//
// XXX would be nice to be able to make the getter lazy, i.e. do
// nothing unless a .then(..) is called right after...
//
sdata: function(d){
this.clearLazy()
// get...
if(arguments.length == 0){
this.then(function(){ return this.__data })
this.lazy(function(){ return this.__data })
// set...
} else {
@ -1126,9 +1154,12 @@ module.hiddenPromise = {
// a second)...
data: function(d){
var that = this
this.clearLazy()
// get...
if(arguments.length == 0){
this.then(function(){
//this.then(function(){
this.lazy(function(){
return new Promise(function(r){
setTimeout(function(){ r(that.__data) }, 1000)
})