Trait Extension 

pub trait Extension: Send + 'static {
    // Required methods
    fn as_mut_any(&mut self) -> &mut dyn Any;
    fn type_id(&self) -> TypeId;

    // Provided methods
    fn start_transaction(&mut self, ty: TransactionType) { ... }
    fn commit_transaction(&mut self, ty: TransactionType) { ... }
    fn rollback_transaction(&mut self, ty: TransactionType) { ... }
}

Marker trait for types that should be registered as Externalities extension.

As extensions are stored as Box<Any>, this trait should give more confidence that the correct type is registered and requested.

Required Methods

fn as_mut_any(&mut self) -> &mut dyn Any

Return the extension as &mut dyn Any.

This is a trick to make the trait type castable into an Any.

fn type_id(&self) -> TypeId

Get the TypeId of this Extension.

Provided Methods

fn start_transaction(&mut self, ty: TransactionType)

Start a transaction of type ty.

fn commit_transaction(&mut self, ty: TransactionType)

Commit a transaction of type ty.

fn rollback_transaction(&mut self, ty: TransactionType)

Rollback a transaction of type ty.

Trait Implementations

impl Extension for Box<dyn Extension>

fn as_mut_any(&mut self) -> &mut dyn Any

Return the extension as &mut dyn Any.

fn type_id(&self) -> TypeId

Get the TypeId of this Extension.

fn start_transaction(&mut self, ty: TransactionType)

Start a transaction of type ty.

fn commit_transaction(&mut self, ty: TransactionType)

Commit a transaction of type ty.

fn rollback_transaction(&mut self, ty: TransactionType)

Rollback a transaction of type ty.

Dyn Compatibility

This trait is dyn compatible.

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

Implementations on Foreign Types

impl Extension for Box<dyn Extension>

fn as_mut_any(&mut self) -> &mut dyn Any

fn type_id(&self) -> TypeId

fn start_transaction(&mut self, ty: TransactionType)

fn commit_transaction(&mut self, ty: TransactionType)

fn rollback_transaction(&mut self, ty: TransactionType)

Implementors