Grokking Microservices Design Patterns
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API Gateway Pattern: An Example

Let us go through a Java code example that shows the API Gateway pattern in use.

The Example System

Consider a library system. Its clients are library users, staff, and management, and they interact with several microservices: the Catalogue Service, the User Service, and the Inventory Service. We'll implement the API Gateway pattern in this scenario to handle and route client requests efficiently.

Defining the Services

Let's first define our microsrvices, each service corresponds to a distinct area of the library's functionality. For instance, the `CatalogueService

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