Concurrency and State Management

[StefanSchade]

Mutex Overhead:

Using Mutex<HashMap<...>> for state management is straightforward but might become a bottleneck under high load due to lock contention. If performance under concurrency is critical, consider using concurrent collections like those in the dashmap crate.

Immutable Data Structures:

For read-heavy workloads, immutable data structures can reduce lock contention. Libraries like im provide such data structures.

[StefanSchade]

Your in-memory repositories use Mutex<HashMap<>> for thread safety. Consider using RwLock instead if reads are more frequent than writes, as it allows multiple readers simultaneously.