Census

该crate允许创建一个跟踪给定类型实例的库存对象。

它在tantivy中用于获取所有仍在索引中使用的文件的准确列表，并避免对它们进行垃圾回收。

此 TrackedObject<T> 实例包含一些引用计数逻辑，以确保对象在最后一个实例被丢弃时从库存中删除。

示例

extern crate census;

use census::{Inventory, TrackedObject};

fn main() {
    let inventory = Inventory::new();

    //  Each object tracked needs to be registered explicitely in the Inventory.
    //  A `TrackedObject<T>` wrapper is then returned.
    let one = inventory.track("one".to_string());
    let two = inventory.track("two".to_string());

    // A snapshot  of the list of living instances can be obtained...
    // (no guarantee on their order)
    let living_instances: Vec<TrackedObject<String>> = inventory.list();
    assert_eq!(living_instances.len(), 2);
}