Trait DataLayer 

pub trait DataLayer<R: Resource>:
    Debug
    + Send
    + Sync
    + 'static {
    // Required methods
    fn create(
        &self,
        resource: R,
    ) -> impl Future<Output = Result<R, CreateError>> + Send;
    fn read(
        &self,
        primary_key: &R::PrimaryKey,
    ) -> impl Future<Output = Result<R, ReadError>> + Send;
    fn update(
        &self,
        resource: R,
    ) -> impl Future<Output = Result<(), UpdateError>> + Send;
    fn destroy(
        &self,
        primary_key: &R::PrimaryKey,
    ) -> impl Future<Output = Result<R, DestroyError>> + Send;
}

Persistence backend for a specific resource type.

The trait is parameterized on R so that different data layers can impose different bounds on the resources they support. For example, InMemoryDataLayer has a blanket impl for all R: Resource, while a SQLite data layer can additionally require R: SqlResource.

Required Methods

fn create( &self, resource: R, ) -> impl Future<Output = Result<R, CreateError>> + Send

Persist a new resource and return the stored version.

The returned resource may differ from the input when the data layer provides server-generated values (e.g. autoincrement primary keys).

fn read( &self, primary_key: &R::PrimaryKey, ) -> impl Future<Output = Result<R, ReadError>> + Send

fn update( &self, resource: R, ) -> impl Future<Output = Result<(), UpdateError>> + Send

fn destroy( &self, primary_key: &R::PrimaryKey, ) -> impl Future<Output = Result<R, DestroyError>> + Send

Remove a resource by primary key, returning the deleted resource.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors

impl<R: Resource + 'static> DataLayer<R> for InMemoryDataLayer