Struct AimDb

Source

pub struct AimDb<R: Spawn + 'static> { /* private fields */ }

Expand description

Producer-consumer database

A database instance with type-safe record registration and cross-record communication via the Emitter pattern. The type parameter R represents the runtime adapter (e.g., TokioAdapter, EmbassyAdapter).

See examples/ for usage.

§Examples

use aimdb_tokio_adapter::TokioAdapter;

let runtime = Arc::new(TokioAdapter);
let db: AimDb<TokioAdapter> = AimDbBuilder::new()
    .runtime(runtime)
    .register_record::<Temperature>(&TemperatureConfig)
    .build()?;

Implementations§

Source §

impl<R: Spawn + 'static> AimDb<R>

Source

pub async fn build_with( rt: Arc<R>, f: impl FnOnce(&mut AimDbBuilder<R>), ) -> DbResult<()>

Builds a database with a closure-based builder pattern

Source

pub fn spawn_task<F>(&self, future: F) -> DbResult<()>
where F: Future<Output = ()> + Send + 'static,

Spawns a task using the database’s runtime adapter

This method provides direct access to the runtime’s spawn capability.

§Arguments

future - The future to spawn

§Returns

DbResult<()> - Ok if the task was spawned successfully

Source

pub async fn produce<T>(&self, value: T) -> DbResult<()>
where T: Send + 'static + Debug + Clone,

Produces a value for a record type

Writes the value to the record’s buffer and triggers all consumers.

Subscribes to a record type’s buffer

Creates a subscription to the configured buffer for the given record type. Returns a boxed reader for receiving values asynchronously.

§Example

let mut reader = db.subscribe::<Temperature>()?;

loop {
    match reader.recv().await {
        Ok(temp) => println!("Temperature: {:.1}°C", temp.celsius),
        Err(_) => break,
    }
}

Source

pub fn producer<T>(&self) -> Producer<T, R>
where T: Send + 'static + Debug + Clone,

Creates a type-safe producer for a specific record type

Returns a Producer<T, R> that can only produce values of type T. This is the recommended way to pass database access to producer services, following the principle of least privilege.

§Example

let db = builder.build()?;
let temp_producer = db.producer::<Temperature>();

// Pass to service - it can only produce Temperature values
runtime.spawn(temperature_service(ctx, temp_producer)).unwrap();

Source

pub fn consumer<T>(&self) -> Consumer<T, R>
where T: Send + Sync + 'static + Debug + Clone,

Creates a type-safe consumer for a specific record type

Returns a Consumer<T, R> that can only subscribe to values of type T. This is the recommended way to pass database access to consumer services, following the principle of least privilege.

§Example

let db = builder.build()?;
let temp_consumer = db.consumer::<Temperature>();

// Pass to service - it can only consume Temperature values
runtime.spawn(temperature_monitor(ctx, temp_consumer)).unwrap();

Source

pub fn runtime(&self) -> &R

Returns a reference to the runtime adapter

Provides direct access to the concrete runtime type.

Source

pub fn list_records(&self) -> Vec<RecordMetadata>

Lists all registered records (std only)

Returns metadata for all registered records, useful for remote access introspection. Available only when the std feature is enabled.

§Example

let records = db.list_records();
for record in records {
    println!("Record: {} ({})", record.name, record.type_id);
}

Source

pub fn try_latest_as_json(&self, record_name: &str) -> Option<Value>

Try to get record’s latest value as JSON by name (std only)

Convenience wrapper around AimDbInner::try_latest_as_json().

§Arguments

record_name - The full Rust type name (e.g., “server::Temperature”)

§Returns

Some(JsonValue) with current value, or None if unavailable

Source

pub fn set_record_from_json( &self, record_name: &str, json_value: Value, ) -> DbResult<()>

Sets a record value from JSON (remote access API)

Deserializes JSON and produces the value to the record’s buffer.

SAFETY: Enforces “No Producer Override” rule - only works for configuration records without active producers.

§Arguments

record_name - Full Rust type name
json_value - JSON value to set

§Returns

Ok(()) on success, error if record not found, has producers, or deserialization fails

§Example (internal use)

db.set_record_from_json("AppConfig", json!({"debug": true}))?;

Source

pub fn subscribe_record_updates( &self, type_id: TypeId, queue_size: usize, ) -> DbResult<(Receiver<Value>, Sender<()>)>

Subscribe to record updates as JSON stream (std only)

Creates a subscription to a record’s buffer and forwards updates as JSON to a bounded channel. This is used internally by the remote access protocol for implementing record.subscribe.

§Architecture

Spawns a consumer task that:

Subscribes to the record’s buffer using the existing buffer API
Reads values as they arrive
Serializes each value to JSON
Sends JSON values to a bounded channel (with backpressure handling)
Terminates when either:
- The cancel signal is received (unsubscribe)
- The channel receiver is dropped (client disconnected)

§Arguments

type_id - TypeId of the record to subscribe to
queue_size - Size of the bounded channel for this subscription

§Returns

Ok((receiver, cancel_tx)) where:

receiver: Bounded channel receiver for JSON values
cancel_tx: One-shot sender to cancel the subscription

Err if:

Record not found for the given TypeId
Record not configured with .with_serialization()
Failed to subscribe to buffer

§Example (internal use)

let type_id = TypeId::of::<Temperature>();
let (mut rx, cancel_tx) = db.subscribe_record_updates(type_id, 100)?;

// Read events
while let Some(json_value) = rx.recv().await {
    // Forward to client...
}

// Cancel subscription
let _ = cancel_tx.send(());

Source

pub fn collect_inbound_routes( &self, scheme: &str, ) -> Vec<(String, Box<dyn ProducerTrait>, DeserializerFn)>

Collects inbound connector routes for automatic router construction (std only)

Iterates all records, filters their inbound_connectors by scheme, and returns routes with producer creation callbacks.

§Arguments

scheme - URL scheme to filter by (e.g., “mqtt”, “kafka”)

§Returns

Vector of tuples: (topic, producer_trait, deserializer)

§Example

// In MqttConnector after db.build()
let routes = db.collect_inbound_routes("mqtt");
let router = RouterBuilder::from_routes(routes).build();
connector.set_router(router).await?;

Source

pub fn collect_outbound_routes( &self, scheme: &str, ) -> Vec<(String, Box<dyn ConsumerTrait>, SerializerFn, Vec<(String, String)>)>

Collects outbound routes for a specific protocol scheme

Mirrors collect_inbound_routes() for symmetry. Iterates all records, filters their outbound_connectors by scheme, and returns routes with consumer creation callbacks.

This method is called by connectors during their build() phase to collect all configured outbound routes and spawn publisher tasks.

§Arguments

scheme - URL scheme to filter by (e.g., “mqtt”, “kafka”)

§Returns

Vector of tuples: (destination, consumer_trait, serializer, config)

The config Vec contains protocol-specific options (e.g., qos, retain).

§Example

// In MqttConnector::build()
let routes = db.collect_outbound_routes("mqtt");
for (topic, consumer, serializer, config) in routes {
    connector.spawn_publisher(topic, consumer, serializer, config)?;
}