Trait ExternalAdapter 

pub trait ExternalAdapter {
    // Required methods
    fn setup(&mut self, configuration: &Value) -> Result<()>;
    fn read(
        &mut self,
        schema: &Schema,
        types: &[TypeName],
        state: &StateData,
    ) -> Result<Vec<ExternalObject>>;
    fn write(
        &mut self,
        schema: &Schema,
        ops: &[Op],
        state: &StateData,
    ) -> Result<ApplyReport>;

    // Provided methods
    fn ensure_schema(&mut self, schema: &Schema) -> Result<ProvisionReport> { ... }
    fn preview_schema(
        &mut self,
        schema: &Schema,
    ) -> Result<Option<ProvisionReport>> { ... }
}

external adapter helper trait.

Required Methods

fn setup(&mut self, configuration: &Value) -> Result<()>

initial configuration of the adapter

fn read( &mut self, schema: &Schema, types: &[TypeName], state: &StateData, ) -> Result<Vec<ExternalObject>>

read objects from the backend.

fn write( &mut self, schema: &Schema, ops: &[Op], state: &StateData, ) -> Result<ApplyReport>

apply operations to the backend.

Provided Methods

fn ensure_schema(&mut self, schema: &Schema) -> Result<ProvisionReport>

provision backend schema elements.

fn preview_schema(&mut self, schema: &Schema) -> Result<Option<ProvisionReport>>

preview schema provisioning, writing nothing. None (the default) means this adapter cannot preview schema; Some(report) is what ExternalAdapter::ensure_schema would provision.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors