1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36

use std::sync::atomic::{AtomicUsize, Ordering};
use crate::config::MemoryOptions;

/// Dvm memory limits checker.
pub struct MemoryChecker {
    counter: AtomicUsize,
    check_interval: usize,
}

impl MemoryChecker {
    /// Constructor.
    pub fn new(options: MemoryOptions) -> MemoryChecker {
        MemoryChecker {
            counter: Default::default(),
            check_interval: options.memory_check_period(),
        }
    }

    /// Returns `true` if the amount of memory exceeds the limit.
    pub fn is_limit_exceeded(&self) -> bool {
        let count = self.counter.fetch_add(1, Ordering::SeqCst);

        if count >= self.check_interval {
            self.counter.store(1, Ordering::SeqCst);
            true
        } else {
            false
        }
    }
}

/// Provide cache size function.
pub trait CacheSize {
    /// Returns cache size.
    fn size(&self) -> usize;
}