93 lines
6.3 KiB
Plaintext
93 lines
6.3 KiB
Plaintext
export const metadata = {
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title: `${pageNumber} Medusa's Architecture`,
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}
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# {metadata.title}
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In this chapter, you'll learn about the architectural layers in Medusa.
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<Note title="Tip">
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Find the full architectural diagram at the [end of this chapter](#full-diagram-of-medusas-architecture).
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</Note>
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## HTTP, Workflow, and Module Layers
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Medusa is a headless commerce platform. So, storefronts, admin dashboards, and other clients consume Medusa's functionalities through its API routes.
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In a common Medusa application, requests go through four layers in the stack. In order of entry, those are:
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1. API Routes (HTTP): Our API Routes are the typical entry point. The Medusa server is based on Express.js, which handles incoming requests. It can also connect to a Redis database that stores the server session data.
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2. Workflows: API Routes consume workflows that hold the opinionated business logic of your application.
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3. Modules: Workflows use domain-specific modules for resource management.
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3. Data store: Modules query the underlying datastore, which is a PostgreSQL database in common cases.
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<Note>
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These layers of stack can be implemented within [plugins](../../fundamentals/plugins/page.mdx).
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</Note>
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---
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## Database Layer
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The Medusa application injects into each module, including your [custom modules](../../fundamentals/modules/page.mdx), a connection to the configured PostgreSQL database. Modules use that connection to read and write data to the database.
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<Note>
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Modules can be implemented within [plugins](../../fundamentals/plugins/page.mdx).
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</Note>
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---
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## Third-Party Integrations Layer
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Third-party services and systems are integrated through Medusa's Commerce and Infrastructure Modules. You also create custom third-party integrations through a [custom module](../../fundamentals/modules/page.mdx).
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<Note>
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Modules can be implemented within [plugins](../../fundamentals/plugins/page.mdx).
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</Note>
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### Commerce Modules
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[Commerce Modules](!resources!/commerce-modules) integrate third-party services relevant for commerce or user-facing features. For example, you can integrate [Stripe](!resources!/commerce-modules/payment/payment-provider/stripe) through a Payment Module Provider, or [ShipStation](!resources!/integrations/guides/shipstation) through a Fulfillment Module Provider.
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You can also integrate third-party services for custom functionalities. For example, you can integrate [Sanity](!resources!/integrations/guides/sanity) for rich CMS capabilities, or [Odoo](!resources!/recipes/erp/odoo) to sync your Medusa application with your ERP system.
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You can replace any of the third-party services mentioned above to build your preferred commerce ecosystem.
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### Infrastructure Modules
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[Infrastructure Modules](!resources!/infrastructure-modules) integrate third-party services and systems that customize Medusa's infrastructure. Medusa has the following Infrastructure Modules:
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- [Analytics Module](!resources!/infrastructure-modules/analytics): Tracks and analyzes user interactions and system events with third-party analytic providers. You can integrate [PostHog](!resources!/infrastructure-modules/analytics/posthog) as the analytics provider.
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- [Cache Module](!resources!/infrastructure-modules/cache): Caches data that require heavy computation. You can integrate a custom module to handle the caching with services like Memcached, or use the existing [Redis Cache Module](!resources!/infrastructure-modules/cache/redis).
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- [Event Module](!resources!/infrastructure-modules/event): A pub/sub system that allows you to subscribe to events and trigger them. You can integrate [Redis](!resources!/infrastructure-modules/event/redis) as the pub/sub system.
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- [File Module](!resources!/infrastructure-modules/file): Manages file uploads and storage, such as upload of product images. You can integrate [AWS S3](!resources!/infrastructure-modules/file/s3) for file storage.
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- [Locking Module](!resources!/infrastructure-modules/locking): Manages access to shared resources by multiple processes or threads, preventing conflict between processes and ensuring data consistency. You can integrate [Redis](!resources!/infrastructure-modules/locking/redis) for locking.
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- [Notification Module](!resources!/infrastructure-modules/notification): Sends notifications to customers and users, such as for order updates or newsletters. You can integrate [SendGrid](!resources!/infrastructure-modules/notification/sendgrid) for sending emails.
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- [Workflow Engine Module](!resources!/infrastructure-modules/workflow-engine): Orchestrates workflows that hold the business logic of your application. You can integrate [Redis](!resources!/infrastructure-modules/workflow-engine/redis) to orchestrate workflows.
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All of the third-party services mentioned above can be replaced to help you build your preferred architecture and ecosystem.
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---
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## Full Diagram of Medusa's Architecture
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The following diagram illustrates Medusa's architecture including all its layers.
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