Struct qstorage::QStorage

pub struct QStorage {
    pub path_name: String,
    pub chunk_size: u64,
    pub block_size: u64,
    pub engine: Engine,
    pub path: &'static str,
    pub db_path: &'static str,
    pub drop_path: &'static str,
}

Object storage instance.

• path_name Storage root directory.
• chunk_size Slice file size.
• block_size Block size.
• context Options file descriptor.
• db_context Indexs file descriptor.
• drop_context Drop indexs file descriptor.

Fields

path_name: String

chunk_size: u64

block_size: u64

engine: Engine

path: &'static str

db_path: &'static str

drop_path: &'static str

Methods

impl QStorage

pub fn new(
    dirname: String,
    chunk_size: u64,
    block_size: u64
) -> Result<Self, Error>

Create an object storage instance.

Initialize an instance with the given configuration.

example

let dirname = String::from("./storage");
QStorage::new(dirname, 10737418240, 1048576)?;

pub fn ready(&mut self) -> Result<&mut Self, Error>

Initialization instance.

Preparation before work.

example

let dirname = String::from("./storage");
QStorage::new(dirname, 10737418240, 1048576)?.ready()?;

pub fn closed(&mut self) -> Result<(), Error>

Turn off the storage system.

Used for shutdown processing.

• This is a required operation. You must do the final cleanup before each shutdown, save the state, you can also call this function each time you need to save the state.
• This operation will write the memory data to the file system.
• For example, listen to the exit event of the process, and then call this function.

example

let dirname = String::from("./storage");
QStorage::new(dirname, 10737418240, 1048576)?.ready()?.closed()?;

pub fn insert(&mut self, key: String, value: Vec<u8>) -> Result<(), Error>

Write data to file storage.

Write key pair data to the file system.

example

let dirname = String::from("./storage");
let mut qstorage = QStorage::new(dirname, 10737418240, 1048576)?.ready()?;
qstorage.insert(String::from("hello"), "word".as_bytes().to_vec())?;

pub fn get(&mut self, key: String) -> Result<Option<Vec<u8>>, Error>

Retrieve data.

Get data based on the specified key.

example

let dirname = String::from("./storage");
let mut qstorage = QStorage::new(dirname, 10737418240, 1048576)?.ready()?;
qstorage.insert(String::from("hello"), "word".as_bytes().to_vec())?;
qstorage.get(String::from("hello"))?;

pub fn remove(&mut self, key: String) -> bool

Delete data.

Remove data based on the specified key.

example

let dirname = String::from("./storage");
let mut qstorage = QStorage::new(dirname, 10737418240, 1048576)?.ready()?;
qstorage.insert(String::from("hello"), "word".as_bytes().to_vec())?;
qstorage.remove(String::from("hello"))?;