**DarkBird is a Document oriented, high concurrency in-memory Storage,
also persist data to disk to avoid loss any data**
The darkbird provides the following:
* **Persistent** - use **Non-Blocking** wal engine for persist data,
also store data to multiple pages by total_page_size
* **In-memory** - whole data stored in-memory
with two mode ( **DiskCopies** , **RamCopies** )
both stored in-memory but DiskCopies persist data to disk and
after restart, darkbird **load whole data to memory**
* **Concurrency** - darkbird use one of best high-concurrent HashMap (DashMap)[https://github.com/xacrimon/conc-map-bench]
and **you don't need use Mutex/RwLock for sync between thread,
storage is complete safe to shared between thread**
* **Migration** - Darkbird storage model is (Key, Document)
if you want change Document Model, can use `migration::run`
for **change all (Key, Document) already exist in disk**
this module should be use before storage opened
* **Event Handling** - can subscribe any channel you want to storage, they
get storage event (```RQuery<Key, Document>, Subscribed(tokio::mpsc::Sender(Event<key, document>))```)
Examples
=============
The complete Examples on [Link](https://github.com/Rustixir/darkbird/tree/main/example).
Crate
=============
```
darkbird = "1.1.1"
```
