CommandValidator

Functional interface for validating command payloads before execution.

Commands implementing this interface can perform custom validation logic on their payload data. Validation ensures that commands contain valid, consistent data before being processed by aggregates, preventing invalid state changes and improving system reliability.

The validation is typically executed early in the command processing pipeline, allowing for fast failure of invalid commands.

See also

data class CreateUserCommand(
    val email: String,
    val password: String
) : CommandValidator {

    override fun validate() {
        require(email.isNotBlank()) { "Email cannot be blank" }
        require(password.length >= 8) { "Password must be at least 8 characters" }
        require(email.contains("@")) { "Email must be valid format" }
    }
}

Throws