push_order: function(order) {

            var self = this;

            if(order){

                this.proxy.log('push_order',order.export_as_JSON());

                this.db.add_order(order.export_as_JSON());

            }

            var pushed = new $.Deferred();

            this.flush_mutex.exec(function(){

                var flushed = self._flush_orders(self.db.get_orders());

                flushed.always(function(ids){

                    pushed.resolve();

                });

            });

            return pushed;

        },