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jquery.dash.js
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jquery.dash.js
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(function($) {
var dashListeners = {};
var defaults = function() {
return {
token: '',
metric: '',
window: 0,
dashHost: 'http://dash-api.fiveruns.com'
};
};
var apiUrl = function(options) {
return options.dashHost +
'/apps/' +
options.token +
'/data-v1.js';
};
var extractParams = function(options) {
params = {callback: '$.dashRouter'};
for (name in options) {
switch (name) {
case 'window':
params['window'] = options['window'];
break;
case 'metric':
params['metric_name'] = options['metric'];
default:
// Skip it
break;
}
}
return params;
};
var cacheKey = function(token, metric, window) {
return token + "-" + metric + "-" + window;
};
var cacheKeyPending = function(params) {
var key = cacheKey(params.token, params.metric, params.window);
return dashListeners.hasOwnProperty(key) && dashListeners[key].length > 1;
};
var addListener = function(params, callback) {
var key = cacheKey(params.token, params.metric, params.window);
if (dashListeners[key] != null) {
dashListeners[key].push(callback);
} else {
dashListeners[key] = [callback];
}
};
$.dashRouter = function(obj) {
var key = cacheKey(obj.token, obj.metricName, obj.window);
$.each(dashListeners[key], function(_, callback) { callback(obj); });
dashListeners[key] = [];
};
$.fn.dash = function(options, callback) {
var options = $.extend(defaults(), options ? options : {});
var el = this;
var params = extractParams(options);
var handler = function(obj) {
switch (options.fetch) {
case "all":
callback.apply(el, [obj]);
break;
case "series":
var datum = $.map(obj.data, function(i) { return i[1]; });
callback.apply(el, [datum]);
break;
case "latest":
var value = obj.data.reverse().pop().pop();
callback.apply(el, [value]);
break;
default:
throw "Invalid Dash fetch option";
break;
};
};
addListener(options, handler);
this.each(function() {
if (!cacheKeyPending(options)) {
$.ajax({type: 'GET',
url: apiUrl(options),
data: params,
dataType: 'script',
cache: true});
}
});
return this;
};
})(jQuery);