Module command 

CQRS Command Pattern

Provides traits for implementing the Command side of CQRS. Commands represent intentions to change state in the system.

Example

use backbone_core::{Command, CommandHandler};

// Define a command
pub struct CreateUserCommand {
    pub email: String,
    pub name: String,
}

impl Command for CreateUserCommand {
    type Result = UserId;
}

// Implement the handler
pub struct CreateUserHandler {
    user_repository: Arc<dyn UserRepository>,
}

#[async_trait::async_trait]
impl CommandHandler<CreateUserCommand> for CreateUserHandler {
    type Error = UserError;

    async fn handle(&self, command: CreateUserCommand) -> Result<UserId, Self::Error> {
        let user = User::new(command.email, command.name)?;
        self.user_repository.create(user).await
    }
}

Traits

Command

Marker trait for CQRS commands.

CommandDispatcher

Command dispatcher for routing commands to their handlers.

CommandHandler

Handler for executing commands.

ValidatableCommand

Trait for commands that can be validated before execution.

ValidatingCommandHandler

Extension trait for handlers that support validated commands.