Implementing Domain-Driven Design

Another Bounded Context Assigns Identity

When another Bounded Context assigns identity, we need to integrate to find, match, and assign each identity. DDD integrations are explained in Context Maps (3) and Integrating Bounded Contexts (13).

Making an exact match is the most desirable. Users need to provide one or more attributes, such as an account number, username, e-mail address, or other unique symbol, to pinpoint the intended result.

Often, matching involves fuzzy input, resulting in multiple search results, along with some human user selection. Figure 5.2 illustrates this. The user enters the “like search” (wildcard) criterion for the sought-after Entity. We access the API of the external Bounded Context, which resolves the search to zero, ...