# foyer
[](https://github.com/MrCroxx/foyer/actions/workflows/main.yml)
[](https://github.com/MrCroxx/foyer/actions/workflows/license_check.yml)
[](https://codecov.io/github/MrCroxx/foyer)
*foyer* aims to be a user-friendly hybrid cache lib in Rust.
*foyer* is inspired by [Facebook/CacheLib](https://github.com/facebook/cachelib), [ben-manes/caffeine](https://github.com/ben-manes/caffeine), and other projects, which is an excellent hybrid cache lib in C++. *foyer* is not only a 'rewrite in Rust project', but provide some features that *CacheLib* doesn't have for now.
## Features
- **Hybrid Cache**: Seamlessly integrates both in-memory and disk-based caching for optimal performance and flexibility.
- **Plug-and-Play Algorithms**: Empowers users with easily replaceable caching algorithms, ensuring adaptability to diverse use cases.
- **Thread Safety**: Built to handle high concurrency with robust thread-safe mechanisms, guaranteeing reliable performance under heavy loads.
- **User-Friendly Interface**: Offers a simple and intuitive API, making cache integration effortless and accessible for developers of all levels.
## Examples
### Out-of-the-box In-memory Cache
```rust
use foyer::{Cache, CacheBuilder};
fn main() {
let cache: Cache<String, String> = CacheBuilder::new(16).build();
let entry = cache.insert("hello".to_string(), "world".to_string());
let e = cache.get("hello").unwrap();
assert_eq!(entry.value(), e.value());
}
```
### Easy-to-use Hybrid Cache
```rust
use foyer::{FsDeviceConfigBuilder, HybridCache, HybridCacheBuilder};
#[tokio::main]
async fn main() -> anyhow::Result<()> {
let dir = tempfile::tempdir()?;
let hybrid: HybridCache<u64, String> = HybridCacheBuilder::new()
.memory(64 * 1024 * 1024)
.storage()
.with_device_config(
FsDeviceConfigBuilder::new(dir.path())
.with_capacity(256 * 1024 * 1024)
.build(),
)
.build()
.await?;
hybrid.insert(42, "The answer to life, the universe, and everything.".to_string());
assert_eq!(
hybrid.get(&42).await?.unwrap().value(),
"The answer to life, the universe, and everything."
);
Ok(())
}
```
### Fully Configured Hybrid Cache
```rust
use std::sync::Arc;
use anyhow::Result;
use chrono::Datelike;
use foyer::{
CacheContext, FsDeviceConfigBuilder, HybridCache, HybridCacheBuilder, LfuConfig, LruConfig,
RatedTicketAdmissionPolicy, RatedTicketReinsertionPolicy, RuntimeConfigBuilder,
};
use tempfile::tempdir;
#[tokio::main]
async fn main() -> Result<()> {
let dir = tempdir()?;
let hybrid: HybridCache<u64, String> = HybridCacheBuilder::new()
.memory(1024)
.with_shards(4)
.with_eviction_config(LruConfig {
high_priority_pool_ratio: 0.1,
})
.with_object_pool_capacity(1024)
.with_hash_builder(ahash::RandomState::default())
.with_weighter(|_key, value: &String| value.len())
.storage()
.with_name("foyer")
.with_eviction_config(LfuConfig {
window_capacity_ratio: 0.1,
protected_capacity_ratio: 0.8,
cmsketch_eps: 0.001,
cmsketch_confidence: 0.9,
})
.with_device_config(
FsDeviceConfigBuilder::new(dir.path())
.with_capacity(64 * 1024 * 1024)
.with_file_size(4 * 1024 * 1024)
.with_align(4 * 1024)
.with_io_size(16 * 1024)
.build(),
)
.with_catalog_shards(4)
.with_admission_policy(Arc::new(RatedTicketAdmissionPolicy::new(10 * 1024 * 1024)))
.with_reinsertion_policy(Arc::new(RatedTicketReinsertionPolicy::new(10 * 1024 * 1024)))
.with_flushers(2)
.with_reclaimers(2)
.with_clean_region_threshold(2)
.with_recover_concurrency(4)
.with_compression(foyer::Compression::Lz4)
.with_runtime_config(
RuntimeConfigBuilder::new()
.with_thread_name("foyer")
.with_worker_threads(4)
.build(),
)
.with_lazy(true)
.build()
.await?;
hybrid.insert(42, "The answer to life, the universe, and everything.".to_string());
assert_eq!(
hybrid.get(&42).await?.unwrap().value(),
"The answer to life, the universe, and everything."
);
let e = hybrid
.entry(20230512, || async {
let value = fetch().await?;
Ok((value, CacheContext::default()))
})
.await?;
assert_eq!(e.key(), &20230512);
assert_eq!(e.value(), "Hello, foyer.");
Ok(())
}
async fn fetch() -> Result<String> {
let now = chrono::Utc::now();
if format!("{}{}{}", now.year(), now.month(), now.day()) == "20230512" {
return Err(anyhow::anyhow!("Hi, time traveler!"));
}
Ok("Hello, foyer.".to_string())
}
```
### Other Cases
More examples and details can be found [here](https://github.com/MrCroxx/foyer/tree/main/examples).
## Supported Rust Versions
*foyer* is built against the latest stable release. The minimum supported version is 1.77.2. The current *foyer* version is not guaranteed to build on Rust versions earlier than the minimum supported version.
## Development state & Roadmap
Currently, *foyer* is still under heavy development.
The development state and the roadmap can be found [here](https://github.com/users/MrCroxx/projects/4).
## Contributing
Contributions for *foyer* are warmly welcomed! 🥰
Don't forget to pass `make check` and `make test` locally before submitting a PR. 🚀
If the `hakari` check failed on CI, please remove the local `Cargo.lock` file and run `make fast` again. 🙏