docs: add diagrams for marker interface, master-worker, mediator, memento, metadata mapping, microservices api gateway, microservices log aggregation, monad, monitor, monostate, multiton, mute idiom

2026-08-21 08:26:16 +00:00 · 2025-04-07 22:14:20 +03:00
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 > API Gateway is a server that acts as an API front-end, receives API requests, enforces throttling and security policies, passes requests to the back-end service and then passes the response back to the requester. A gateway often includes a transformation engine to orchestrate and modify the requests and responses on the fly. A gateway can also provide functionality such as collecting analytics data and providing caching. The gateway can provide functionality to support authentication, authorization, security, audit and regulatory compliance.

+Sequence diagram
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+![Microservices API Gateway sequence diagram](./etc/microservices-api-gateway-sequence-diagram.png)
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 ## Programmatic Example of Microservice API Gateway in Java

 This implementation shows what the API Gateway pattern could look like for an e-commerce site. The`ApiGateway` makes calls to the Image and Price microservices using the `ImageClientImpl` and `PriceClientImpl` respectively. Customers viewing the site on a desktop device can see both price information and an image of a product, so the `ApiGateway` calls both of the microservices and aggregates the data in the `DesktopProduct` model. However, mobile users only see price information; they do not see a product image. For mobile users, the `ApiGateway` only retrieves price information, which it uses to populate the `MobileProduct`.