let flushQueue = {
items: [],
getChangeHandler: function(service){
return {
set: (obj, prop, newval) => {
obj[prop] = newval;
service.consume(false);
}
}
},
consumer: null, //user function
onEmpty: null, //user function
validator: null, //user function
validate: function() {
let result = true;
this.items.forEach((item) => {
if(!this.validator(item)) {
console.log(item);
result = false;
}
});
return result && this.items.length > 0;
},
consume: function(tested) {
if(tested || this.validate()) {
var item = this.items.shift();
if(this.consumer){
try{
this.consumer(item);
}
catch(e){
}
}

if(this.items.length > 0) {
this.consume(true);
}
else if(item && this.onEmpty) {
this.onEmpty();
}
}
},
add: function(itemIn) {
let item = new Proxy(itemIn, this.getChangeHandler(this));
this.items.push(item);
this.consume(false);
return item;
},
addAll: function(items) {
let out = [];
items.forEach((itemIn, key) => {
let item = new Proxy(itemIn, this.getChangeHandler(this));
this.items.push(item);
out[key] = item;
});
this.consume(false);
return out;
}
};

flushQueue.validator = (item) => {
return item.checked;
};
flushQueue.onEmpty = () => {
console.log("flushed!");
};
flushQueue.consumer = (item) => {
console.log("consumed -> " + item.id);
return true;
}

let items = [
{id: 1, checked: true},
{id: 2, checked: true},
{id: 3, checked: true},
{id: 4, checked: true},
{id: 5, checked: true},
{id: 6, checked: true},
{id: 7, checked: false},
];

let itemsP = flushQueue.addAll(items);
console.log("add all");
console.log("pre change");
itemsP[6].checked = true;
console.log("post change");