Module traits 

Cache Backend Traits

This module defines the trait abstractions that allow users to implement custom cache backends for both L1 (in-memory) and L2 (distributed) caches.

Architecture

• CacheBackend: Core trait for all cache implementations
• L2CacheBackend: Extended trait for L2 caches with TTL introspection
• StreamingBackend: Optional trait for event streaming capabilities

Example: Custom L1 Backend

use multi_tier_cache::{CacheBackend, async_trait};
use std::time::Duration;
use anyhow::Result;

struct MyCustomCache {
    // Your implementation
}

#[async_trait]
impl CacheBackend for MyCustomCache {
    async fn get(&self, key: &str) -> Option<serde_json::Value> {
        // Your implementation
    }

    async fn set_with_ttl(&self, key: &str, value: serde_json::Value, ttl: Duration) -> Result<()> {
        // Your implementation
    }

    async fn remove(&self, key: &str) -> Result<()> {
        // Your implementation
    }

    async fn health_check(&self) -> bool {
        // Your implementation
    }
}

Traits

CacheBackend

Core cache backend trait for both L1 and L2 caches

L2CacheBackend

Extended trait for L2 cache backends with TTL introspection

StreamingBackend

Optional trait for cache backends that support event streaming