A method, computer program product, and computer system for updating observable values for multiple user-interface components. A computer system reads first values indexed by keys from a cache, in response to receiving a request from the multiple user-interface components. The computer system reads second values, which are indexed by the keys, from persistent storage. The computer system compares the first values and the second values based on the keys. The computer system writes the second values as new values of the first values in the cache. The computer system notifies one or more observers for respective ones of the first values, wherein the respective ones of the first values are changed. And, the computer system notifies the one or more observers for the first values that reading and writing operations are finished.