Struct MigrationRegistry 

pub struct MigrationRegistry { /* private fields */ }

Registry of schema migrations.

Stores migrations between schema versions and provides path-finding for multi-hop migrations (e.g., v1 → v2 → v3).

Implementations

impl MigrationRegistry

pub fn new() -> Self

Create a new empty migration registry.

pub fn register(&self, migration: Migration) -> Result<()>

Register a migration.

If a migration between the same schemas already exists, it is replaced.

pub fn unregister(&self, from_hash: u64, to_hash: u64) -> Option<Migration>

Unregister a migration.

pub fn find_direct(&self, from_hash: u64, to_hash: u64) -> Option<Migration>

Find a direct migration from one schema to another.

pub fn find_path(&self, from_hash: u64, to_hash: u64) -> Option<Vec<Migration>>

Find the migration path from one schema to another.

Returns the migrations in order, or None if no path exists.

pub fn has_path(&self, from_hash: u64, to_hash: u64) -> bool

Check if a migration path exists.

pub fn migrate( &self, arena: &Arena, offset: ArenaOffset, from_hash: u64, to_hash: u64, ) -> Result<ArenaOffset>

Apply migration to arena data.

Finds the migration path and applies each migration in sequence.

pub fn list(&self) -> Vec<Migration>

Get all registered migrations.

pub fn len(&self) -> usize

Get the number of registered migrations.

pub fn is_empty(&self) -> bool

Check if the registry is empty.

pub fn migrations_from(&self, from_hash: u64) -> Vec<Migration>

Get migrations from a specific schema.

pub fn migrations_to(&self, to_hash: u64) -> Vec<Migration>

Get migrations to a specific schema.

Trait Implementations

impl Default for MigrationRegistry

fn default() -> Self

Returns the “default value” for a type.