Lifecycle Hooks

Execution Workflow

1. Choose the exact lifecycle stage needed for behavior injection.
2. Keep hook logic deterministic and focused on cross-cutting concerns.
3. Compose hook behavior with middleware order and exception handling.
4. Verify hook side effects are observable and testable.

Implementation Rules

• Keep hooks lightweight to avoid latency inflation.
• Avoid embedding domain business rules in hooks.
• Make ordering dependencies explicit when multiple hooks interact.
• Ensure hook errors are handled without masking root cause.
• Do not substitute hooks for event emission when multiple decoupled side effects should react to one domain action.

Example Pattern

# Pseudocode pattern: attach lifecycle hooks for cross-cutting behavior.
from litestar import Litestar

app = Litestar(
    route_handlers=[...],
    before_send=[...],
    after_exception=[...],
)

Validation Checklist

• Confirm hook execution order matches design.
• Confirm hooks run for both success and error paths where intended.
• Confirm instrumentation and policy side effects are deterministic.

Cross-Skill Handoffs

• Use litestar-app-setup for startup/shutdown hooks, lifespan, and application resource ownership.
• Use litestar-events for decoupled in-process side effects with listeners and app.emit(...).
• Use litestar-middleware for ASGI-wide policies that should wrap the whole pipeline.

Litestar References

• https://docs.litestar.dev/latest/usage/lifecycle-hooks.html
• https://docs.litestar.dev/latest/usage/middleware/index.html