--- /dev/null
+var RetryOperation = require('./retry_operation');
+
+exports.operation = function(options) {
+ var timeouts = exports.timeouts(options);
+ return new RetryOperation(timeouts);
+};
+
+exports.timeouts = function(options) {
+ if (options instanceof Array) {
+ return [].concat(options);
+ }
+
+ var opts = {
+ retries: 10,
+ factor: 2,
+ minTimeout: 1 * 1000,
+ maxTimeout: Infinity,
+ randomize: false
+ };
+ for (var key in options) {
+ opts[key] = options[key];
+ }
+
+ if (opts.minTimeout > opts.maxTimeout) {
+ throw new Error('minTimeout is greater than maxTimeout');
+ }
+
+ var timeouts = [];
+ for (var i = 0; i < opts.retries; i++) {
+ timeouts.push(this._createTimeout(i, opts));
+ }
+
+ // sort the array numerically ascending
+ timeouts.sort(function(a,b) {
+ return a - b;
+ });
+
+ return timeouts;
+};
+
+exports._createTimeout = function(attempt, opts) {
+ var random = (opts.randomize)
+ ? (Math.random() + 1)
+ : 1;
+
+ var timeout = Math.round(random * opts.minTimeout * Math.pow(opts.factor, attempt));
+ timeout = Math.min(timeout, opts.maxTimeout);
+
+ return timeout;
+};
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