Framework lifecycle business function: context + environment -> shared instance

Dependency Injection with Generated Maker Functions

The generated dependency-injection boundary for functions, endpoints, clients, servers, serializers, and infrastructure.

When to use

Use this page when implementing maker hooks, owning resources, or diagnosing startup and shutdown.

Generated defaults map graph elements to concrete framework constructors.
The custom maker hook runs before invocation and may replace selected defaults.
Independent makers run concurrently with shared cancellation after the first failure.
Each business-function result is stored once per service and shared by all referencing streams for the service lifetime. Infrastructure makers retain their typed configuration. Endpoint-handler makers receive context and environment only.

GeneratedInstall defaultsAssign every required factory.

User hookOverride makersReplace only selected factories.

StartupInvoke in parallelCreate one long-lived instance.

RunningReuse instanceMany messages call the stored object.

ShutdownRelease after drainOwnership ends after dependent work.

Create dependency clients and immutable collaborators.
Business-function makers receive context and environment, not a stream or stream configuration. Endpoint-handler makers also receive no endpoint configuration. Infrastructure makers validate their own typed configuration.
Return a function object whose hooks create per-request state.
Leave activation and shutdown to runtime lifecycle methods.

Generated extension points and runtime-owned lifecycle boundaries.

PropertyTypeDescription

contextcancellation/deadline

Cancels sibling initialization after a failure.

environmentServiceEnvironment

Logging, metrics, serde, callers, and runtime configuration.

configtyped graph config

Only infrastructure makers receive typed configuration. Business-function and endpoint-handler makers receive context and environment only.

resultowned instance

Long-lived function or infrastructure object.

customMakersInit(ctx) {
  makers.<function_name> = async (ctx, env) => new CustomFunction(...);
}