Struct MemoryStorageSnapshot 

pub struct MemoryStorageSnapshot { /* private fields */ }

A snapshot of all in-memory state that can be restored later.

This enables rollback functionality similar to SQLite savepoints, allowing you to:

1. Create a snapshot before an operation
2. Attempt the operation
3. Restore the snapshot if the operation fails or needs to be undone

Concurrency

Snapshot creation and restoration are atomic. create_snapshot() acquires a global read lock and restore_snapshot() acquires a global write lock, ensuring consistency in multi-threaded environments.

Example

let storage = MdkMemoryStorage::default();

// Make some changes
storage.save_group(group)?;

// Create a snapshot (ensure no concurrent operations)
let snapshot = storage.create_snapshot();

// Try an operation that might need rollback
storage.save_message(message)?;

// If we need to undo (ensure no concurrent operations):
storage.restore_snapshot(snapshot);

Trait Implementations

impl Clone for MemoryStorageSnapshot

fn clone(&self) -> MemoryStorageSnapshot

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.