# Host

### What it is responsible for

Host manages the entry points represented by `HostController` and `HostModule`, including `greeting`, `asyncGreeting`, `streamGreeting`, and `localPipe`. It also owns named services and classes including `HostService`, `UsersService`, `UserByIdPipe`, and `TestDto`. The evidence does not identify endpoint-to-service links, configuration, inputs, outputs, or execution order explicitly here.

### What it needs, and who needs it

Host needs no dependencies from elsewhere in this repository. `Integration` needs Host: it is listed as depending on this subsystem. Without Host, [Integration](subsystem-integration) would lack that declared dependency, and `HostController`, `HostModule`, and `HostService` would not be available from it.

10 entities in `integration/hello-world/src/host`. **1 other subsystem depends on it**, which makes it the 5th most depended-upon part of this codebase.

## What it is made of

Its 10 entities sit in 6 files under `integration/hello-world/src/host`: 4 HTTP endpoints, 3 services, 1 controller, 1 module and 1 more.
`host.controller.ts` holds 5 of them — more than any other file here.

## Where work enters

1 controller publishes 4 `GET` endpoints. None of them declares a guard.

- `HostController` — `integration/hello-world/src/host/host.controller.ts`:6
- `greeting` — `integration/hello-world/src/host/host.controller.ts`:13
- `asyncGreeting` — `integration/hello-world/src/host/host.controller.ts`:19
- `streamGreeting` — `integration/hello-world/src/host/host.controller.ts`:24
- `localPipe` — `integration/hello-world/src/host/host.controller.ts`:29
- `HostModule` — `integration/hello-world/src/host/host.module.ts`:6

## Boundaries

**1 other subsystem depends on this one** — `Integration`. Changing what it exposes changes them.

They hold 1 edge into it between them. What they reach is narrower than the folder: 1 of its 10 members carries every inbound edge — `HostModule` (1).

**It depends on no other subsystem in this repository** — it is a leaf.