Expand description
jsave
Persistent storage copy in JSON format for serializable in-memory data
Design
Just like RwLock, jsave is a reader-writer lock, but serializes and saves data to a file in json format on every writing operation finish
Do not use it unless you only want to persist a tiny amount of data
Usage
use serde_derive::{Deserialize, Serialize};
use std::collections::HashMap;
// Data to be persisted. Needs to be serializable and deserializable
#[derive(Debug, Serialize, Deserialize)]
struct Data {
data: HashMap<String, usize>,
}
let data = Data {
data: HashMap::new(),
};
use std::fs::File;
// Create the file for storing the data
File::create("db_file").unwrap();
use jsave::Jsave;
// Initialize a new Jsave instance with the given data. Note that the file will be truncated
let db = Jsave::init_with(data, "db_file").unwrap();
{
// Read data
let db_read = db.read();
println!("{:?}", *db_read);
}
{
// Read and write data
let mut db_write = db.write();
db_write.data.insert("foo".to_owned(), 114514);
println!("{:?}", *db_write);
// Automatically saving data to file when the `JsaveWriteGuard` is dropped
}
drop(db);
// Initialize a new Jsave instance from a file
let db = Jsave::<Data>::init("db_file").unwrap();
let db_read = db.read();
println!("{:?}", *db_read);License
GNU General Public License v3.0