# `Anubis.Server.Transport.StreamableHTTP.EventStore.InMemory`

In-memory `Anubis.Server.Transport.StreamableHTTP.EventStore` adapter backed by
a single GenServer.

Each session keeps a bounded ring of the most recent `{event_id, data}` pairs.
Event ids are drawn from a single store-wide monotonic counter, so they never
restart at `1` for a session that was evicted and later reappears — a
reconnect carrying an old higher `Last-Event-ID` therefore never filters out
genuinely newer events. This is the default adapter and is suitable for
single-node HTTP deployments: it makes short reconnect gaps seamless without
any external dependency.

## Bounds

  * `:history_size` — events retained per session (default `100`). Older events
    are evicted; a client whose `Last-Event-ID` predates the ring recovers only
    the events still held (see the `EventStore` behaviour on gaps).
  * `:max_sessions` — sessions retained before the least-recently-appended one
    is evicted (default `1_000`, or `:infinity` to disable). This bounds memory
    for servers that churn sessions without an explicit `DELETE`. Sessions are
    also dropped promptly on `delete/2`. Because ids come from the store-wide
    counter, an evicted session that reappends resumes with strictly larger
    ids.

Events are lost on process restart. Recovery across restarts is a host-level
concern (e.g. a durable journal), by design: the transport ring exists to make
live reconnects seamless, not to be a system of record.

# `child_spec`

Returns a specification to start this module under a supervisor.

See `Supervisor`.

# `get_schema`

# `parse_options`

# `parse_options!`

# `start_link`

```elixir
@spec start_link(keyword()) :: GenServer.on_start()
```

Starts the in-memory event store.

## Options

  * `:name` — registered process name (required)
  * `:history_size` — events retained per session (default `100`)
  * `:max_sessions` — sessions retained before LRU eviction, or `:infinity`
    (default `1000`)

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*Consult [api-reference.md](api-reference.md) for complete listing*