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Data Mapping Extension

Definition:

Mapping data between Provider Objects and a Domain Object.

  • Data Mapping should also be able to reverse, from the Domain Object to the Provider Object.

Reason:

A clear statement on how data should be mapped will ease the implementation of EDR. This statement will also simplify the transition from basic to advanced mapping strategies.

Enforcement:

We recommend using data mapping. Data Mapping is a extension to EDR, not mandatory.

Strategies:

  • Objects dedicated for Mapping
  • XSLT - Using XML and XSL to transform data from one object to the other
  • External tool to perform the mapping.
  • Mapping service (advanced mapping)

We do not recommend that the Service Factory or Repository Controller contains the code to perform the Data Mapping for the following reasons:

  • Cluttering of concerns
  • Harder to let the code evolve as experience with the functionality is gained.

Mapping service

Why:

  • Handle advanced mappings of datatypes.
  • Handle that one or more sub systems are unavailable for read and update.
  • Decision rules for update.
  • Detect inconsistency in the same data, in different subsystems.
  • Automatically update or report findings of inconsistent data.
  • Single point of entry for all data mappings, regardless of service used.