Created
February 2, 2014 07:42
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Javascript data synchronization
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/** | |
Used to synchronize multiple types of storage and their timestamps. | |
options{ | |
data : {}, the state that all storage should take. | |
date: int, the modified date that all storage should take | |
interval : int, sync interval in milliseconds. | |
callbacks : [], an ARRAY of callback functions which are to each be executed with data | |
and date as params. Each callback should be used to update a single storage medium. | |
} | |
*/ | |
function Synchronize(options) { | |
var that = this, | |
timer = false, | |
interval = options.interval || 1000, | |
callbacks = options.callbacks || []; | |
this.mem = options.data; | |
//This is to keep the changes in data from differing between syncs | |
this.startSync = function() { | |
if (timer) { | |
(function() {})(); | |
} else { | |
timer = setInterval(function() { | |
var dataCopy = JSON.parse(JSON.stringify(that.mem)); | |
var _date = options.date || new Date().getTime(); | |
that.sync({ | |
data: dataCopy, | |
date: _date | |
}); | |
}, interval); | |
} | |
}; | |
this.stopSync = function() { | |
if (timer) { | |
clearInterval(timer); | |
timer = false; | |
} | |
}; | |
/** sync | |
opt{ | |
data: data to call callbacks with. | |
modifiedDate : set modifiedDate to same date on all callbacks | |
} | |
*/ | |
this.sync = function(opt) { | |
try { | |
var option = opt || {}; | |
var _date = option.date || new Date().getTime(); | |
var _data = option.data || JSON.parse(JSON.stringify(that.mem)); | |
var callparam = { | |
date: _date, | |
data: _data | |
}; | |
if (callbacks && callbacks.push) { | |
for (var i = 0; i < callbacks.length; i++) { | |
callbacks[i](callparam); | |
} | |
} else { | |
throw "Synchronize: callbacks not passed as array."; | |
} | |
} catch (e) { | |
console.log(e.message); | |
console.log(e.stack); | |
} | |
}; | |
} | |
//Example Usage | |
var sync, | |
local = {}, | |
remote = {}, | |
mem = { | |
'name': 'alex', | |
'age': '21' | |
}; | |
sync = new Synchronize({ | |
data: mem, | |
date: "23:42", | |
interval: 1000, | |
callbacks: [ | |
function() { | |
var opt = arguments[0]; | |
var date = opt.date, | |
data = opt.data; | |
local = opt; | |
}, | |
function() { | |
var opt = arguments[0]; | |
var date = opt.date, | |
data = opt.data; | |
remote = opt; | |
} | |
] | |
}); | |
sync.startSync(); | |
mem.name = 'woah'; | |
mem.age = '21'; | |
mem.nestedObject = { | |
'properties': { | |
width: 25, | |
date: 'february 2nd' | |
}, | |
'type': 'nested' | |
}; | |
window.setTimeout(function() { | |
console.log(memory); | |
console.log(remote); | |
console.log(local) | |
}, 1000) | |
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