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function RetryOperation(timeouts) {
  this._timeouts = timeouts;
  this._fn = null;
  this._errors = [];
  this._attempts = 1;
  this._operationTimeout = null;
  this._operationTimeoutCb = null;
  this._timeout = null;
}
module.exports = RetryOperation;
RetryOperation.prototype.retry = function(err) {
  if (this._timeout) {
    clearTimeout(this._timeout);
  }
  if (!err) {
    return false;
  }
  this._errors.push(err);
  var timeout = this._timeouts.shift();
  if (timeout === undefined) {
    return false;
  }
  this._attempts++;
  var self = this;
  setTimeout(function() {
    self._fn(self._attempts);
    if (self._operationTimeoutCb) {
      self._timeout = setTimeout(function() {
        self._operationTimeoutCb(self._attempts);
      }, self._operationTimeout);
    }
  }, timeout);
  return true;
};
RetryOperation.prototype.attempt = function(fn, timeoutOps) {
  this._fn = fn;
  if (timeoutOps) {
    if (timeoutOps.timeout) {
      this._operationTimeout = timeoutOps.timeout;
    }
    if (timeoutOps.cb) {
      this._operationTimeoutCb = timeoutOps.cb;
    }
  }
  this._fn(this._attempts);
  var self = this;
  if (this._operationTimeoutCb) {
    this._timeout = setTimeout(function() {
      self._operationTimeoutCb();
    }, self._operationTimeout);
  }
};
RetryOperation.prototype.try = function(fn) {
  console.log('Using RetryOperation.try() is deprecated');
  this.attempt(fn);
};
RetryOperation.prototype.start = function(fn) {
  console.log('Using RetryOperation.start() is deprecated');
  this.attempt(fn);
};
RetryOperation.prototype.start = RetryOperation.prototype.try;
RetryOperation.prototype.errors = function() {
  return this._errors;
};
RetryOperation.prototype.attempts = function() {
  return this._attempts;
};
RetryOperation.prototype.mainError = function() {
  if (this._errors.length === 0) {
    return null;
  }
  var counts = {};
  var mainError = null;
  var mainErrorCount = 0;
  for (var i = 0; i < this._errors.length; i++) {
    var error = this._errors[i];
    var message = error.message;
    var count = (counts[message] || 0) + 1;
    counts[message] = count;
    if (count >= mainErrorCount) {
      mainError = error;
      mainErrorCount = count;
    }
  }
  return mainError;
};