# apache/eventmesh

EventMesh is a new generation serverless event middleware for building distributed event-driven applications.

Repository: https://github.com/apache/eventmesh
Canonical: https://ross.abutalabs.com/products/eventmesh
Homepage: https://eventmesh.apache.org/
Language: Java
License: Apache-2.0
License Family: permissive
Topics: esb, event-driven, event-mesh, event-governance, cloud-native, serverless, message-bus, event-gateway, event-streaming, event-sourcing, serverless-workflow, cqrs, multi-runtime, pubsub, microservice, hacktoberfest, event-connector
Last push: 2026-08-20T03:40:23+00:00

## Health v2 (maintenance only)
Score: 75/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 98, release rhythm 31, longevity 100
- inputs: {"age_days": 2543, "days_push": 13, "days_rel": 246, "gap_med": 372, "n_releases_24m": 2}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1746, forks 654 (observed 2026-08-28T04:05:30.720345+00:00)

## What it is
Apache EventMesh is a cloud-native, serverless event middleware for building distributed event-driven applications. It provides a unified CloudEvents-based event bus with multi-protocol gateways (HTTP, gRPC, TCP, WebSocket), pluggable event stores like RocketMQ and Kafka, and a Serverless Workflow orchestration engine.

## Use cases
- decouple microservices with a pub/sub event bus
- route events between services and external systems via CloudEvents
- build event-driven applications with at-least-once delivery guarantees
- orchestrate event workflows with declarative YAML
- bridge Kafka, RocketMQ, Pulsar, and RabbitMQ behind one gateway
- connect AI agents through a unified agent message bus
- translate between HTTP, gRPC, TCP, and WebSocket protocols
- manage event schemas across a distributed system

## When to choose
- you need a vendor-neutral event backbone built on the CloudEvents standard
- you want to unify multiple message queues behind a single event gateway
- you need event routing, filtering, transformation, and workflow orchestration in one platform
- you are building multi-cloud or widely distributed event-driven topologies
- you want protocol translation between HTTP, gRPC, TCP, and WebSocket without code changes

## When to avoid
- you only need simple point-to-point messaging that a single broker like Kafka or RabbitMQ already covers
- you want a lightweight in-process message bus inside a single application
- your team cannot operate an additional Java-based middleware layer
- you need strict exactly-once semantics in every scenario despite the advertised support

## Facets
- artifact type: service
- maturity: active
- function: message-queue, middleware, api-gateway, workflow-automation, webhook, rpc, http-server, sdk
- domain: microservices, cloud-computing, backend, apis
- platform: jvm, cloud, self-hosted, cross-platform
- tags: event-driven-architecture, cloudevents, event-mesh, event-gateway, event-streaming, event-sourcing, cqrs, pubsub, serverless-workflow, esb, event-connector, a2a-protocol, schema-registry, messaging, ai-agents, docker, kubernetes

## Member repositories
- apache/eventmesh (main) score 75

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:30.720345+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T03:29:11.315464+00:00, confidence not recorded.
  - readme: https://github.com/apache/eventmesh (fetched 2026-08-28T04:05:30.720345+00:00, sha bab6dfdd81a7)
  - homepage: https://eventmesh.apache.org/ (fetched 2026-08-29T11:07:04.364340+00:00, sha adf4ebe73d6d)
  - site_page: https://eventmesh.apache.org/docs/introduction (fetched 2026-08-29T11:07:04.367916+00:00, sha 2518bf3aff05)
  - site_page: https://eventmesh.apache.org/docs/next/introduction (fetched 2026-08-29T11:07:04.370407+00:00, sha 328c4bfba5b2)
  - site_page: https://eventmesh.apache.org/docs/v1.11.0/introduction (fetched 2026-08-29T11:07:04.372887+00:00, sha 9c9e18b97472)
  - site_page: https://eventmesh.apache.org/docs/v1.10.0/introduction (fetched 2026-08-29T11:07:04.375039+00:00, sha 32a79a8387cf)
  - site_page: https://eventmesh.apache.org/docs/v1.9.0/introduction (fetched 2026-08-29T11:07:04.377104+00:00, sha f69dc11cd01c)
  - site_page: https://eventmesh.apache.org/docs/v1.8.0/introduction (fetched 2026-08-29T11:07:04.379089+00:00, sha d73825bc52d3)
  - site_page: https://eventmesh.apache.org/docs/v1.7.0/introduction (fetched 2026-08-29T11:07:04.381117+00:00, sha f4138243cca0)
  - site_page: https://eventmesh.apache.org/docs/v1.6.0/introduction (fetched 2026-08-29T11:07:04.383238+00:00, sha 58e819484477)
- Data as of 2026-08-30T08:39:29.467469+00:00.