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Infrastructure layer that mediates and integrates between applications, platforms and services.
Middleware connects distributed system components, abstracts communication and provides shared services such as messaging, transaction and identity management. It facilitates integration, scalability and evolution of complex architectures by standardizing interfaces and cross-platform capabilities; common forms include message brokers, API gateways and application servers. Deployment decisions weigh latency, reliability, operational complexity and security requirements.
Time from sending to receiving a message including middleware processing time.
Share of lost or undelivered messages during communication.
Frequency of errors and repeated delivery attempts as an indicator of stability.
Kafka as an event log to decouple producers and consumers in a scalable system.
An API gateway aggregates different backend APIs, centralizes authentication and monitoring.
Traditional application servers provide runtime services like transaction and session management for enterprise apps.
Analyze integration requirements and select appropriate patterns
Introduce a middleware component prototypically and validate
Migrate incrementally, define monitoring and establish SLAs