UNIFIED AND EXTENSIBLE IMPLEMENTATION OF A CHANGE STATE ID FOR UPDATE SERVICES BASED ON A HASH CALCULATION

摘要

In a method and system for updating data in a distributed system, a server receives a request to read data stored in the server. A data structure is populated with the requested data, and a first unique identifier is generated by applying a hash function to the data stored in the data structure. The data and the first unique identifier are transmitted to the requesting client. From the client system, the server receives the first unique identifier and changes to the requested data performed on the client system through a web service application. The changes include an extension to the requested application data to include customer-specific data. Following receipt of the changed data and the first unique identifier, a second data structure is populated with the requested data. A second unique identifier is generated by applying a hash function to the data stored in the second data structure. The server compares the first and the second unique identifiers, and if the identifiers are identical, the requested data is replaced by the changed data. If the identifiers are not identical, the changed data is discarded.