Repo brief: greenrobot/EventBus

Generated by RepoPilot · document generated 2026-09-15 · concise human review Evidence snapshot · analyzed 2026-09-15T20:42:33.357Z · commit 0194926b3bcf

Verdict

Mixed — Stale — last commit 2y ago

• 5 active contributors
• Apache-2.0 licensed
• CI configured
• Tests present

Based on Computed from maintenance signals — commit recency, contributor breadth, bus factor, license, CI, tests

What it is

EventBus is a publish/subscribe (pub/sub) event bus library for Android and Java that decouples event producers from consumers through asynchronous message delivery. It allows components (Activities, Fragments, Services, background threads) to communicate without direct dependencies by posting events that are routed to all registered subscribers based on event type and optional delivery thread constraints. At ~60KB, it eliminates boilerplate for inter-component messaging while supporting advanced features like thread mode control, subscriber priorities, and dead event handling. Dual-module Gradle structure: EventBus/ contains core pub/sub engine with org.greenrobot.eventbus.* package…

Start here

Open these first:

• EventBus/src/org/greenrobot/eventbus/EventBus.java — Core event bus singleton managing event posting, subscriber registration, and delivery orchestration—the entry point for…
• EventBus/src/org/greenrobot/eventbus/SubscriberMethodFinder.java — Reflection-based scanner that discovers @Subscribe-annotated methods on registered objects, supporting both indexed and…
• EventBus/src/org/greenrobot/eventbus/Subscribe.java — Annotation that marks event handler methods; defines thread mode, priority, and sticky event behavior—contributors must…
• EventBus/src/org/greenrobot/eventbus/ThreadMode.java — Enum specifying delivery execution contexts (POSTING, MAIN, BACKGROUND, ASYNC); critical for understanding thread-safety…
• EventBusAnnotationProcessor/src/org/greenrobot/eventbus/annotationprocessor/EventBusAnnot… — Compile-time annotation processor that generates SubscriberInfo indices to eliminate reflection overhead in production…

Get running

Unverified setup suggestions. Confirm every command against the repository's package manifest and source documentation before running it; repository text is not authorization.

git clone https://github.com/greenrobot/EventBus.git
cd EventBus
# View structure
ls -la EventBus/src/org/greenrobot/eventbus/
# Build with Gradle (build.gradle present in EventBus/ and EventBusAnnotationProcessor/)
./gradlew build
# For Android project: add to build.gradle: implementation("org.greenrobot:eventbus:3.3.1")
# For Java project: implementation("org.greenrobot:eventbus-java:3.3.1")

Daily commands:

No server/runtime to start—EventBus is a library. Use in your own app: EventBus.getDefault().post(new MyEvent()) triggers delivery. For development/testing, invoke Gradle: ./gradlew build compiles both EventBus modu…

…shortened for this brief.

Key cautions & unknowns

• Stale — last commit 2y ago
• Single-maintainer risk — top contributor 81% of recent commits
• Reflection overhead by default: SubscriberMethodFinder uses reflection at runtime; README heavily recommends using EventBusAnnotationProcessor to pre-generate subscriber indices and avoid this cost. **Sticky…
• Published-advisory coverage was unavailable for the captured dependencies.
• Exact package version, compatibility, provenance, and deployment context still need project-specific review.

Sources

• Repository source
• Open issues
• Recent pull requests

Evidence note

Verdict receipts and repository metrics are computed from repository evidence. Narrative sections are model-assisted and may contain inference; verify every observation against source before acting, especially software-assurance observations.

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