infinitree 0.11.0

Embedded, encrypted database with tiered cache
Documentation 
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
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152

use super::{ObjectError, Result};
use flume as mpsc;
use std::{
    num::NonZeroUsize,
    ops::{Deref, DerefMut},
    sync::Arc,
};

pub(crate) mod buffer;
pub(crate) mod reader;
pub(crate) mod writer;

pub struct Pool<O> {
    enqueue: mpsc::Sender<O>,
    dequeue: mpsc::Receiver<O>,
    count: usize,
    constructor: Option<Arc<dyn Fn() -> O + Send + Sync>>,
}

impl<O> Clone for Pool<O> {
    fn clone(&self) -> Self {
        Self {
            enqueue: self.enqueue.clone(),
            dequeue: self.dequeue.clone(),
            count: self.count,
            constructor: self.constructor.clone(),
        }
    }
}

impl<O: 'static + Clone> Pool<O> {
    pub fn new(items: NonZeroUsize, instance: O) -> Result<Self> {
        let count = items.get();
        let (enqueue, dequeue) = mpsc::bounded(count);

        for _ in 0..(count - 1) {
            enqueue
                .send(instance.clone())
                .map_err(|_| ObjectError::Fatal)?;
        }
        enqueue.send(instance).map_err(|_| ObjectError::Fatal)?;

        Ok(Self {
            enqueue,
            dequeue,
            count,
            constructor: None,
        })
    }
}

impl<O: 'static> Pool<O> {
    pub fn with_constructor(
        count: usize,
        constructor: impl Fn() -> O + Send + Sync + 'static,
    ) -> Self {
        let (enqueue, dequeue) = mpsc::bounded(count);

        for _ in 0..count {
            enqueue.send(constructor()).unwrap();
        }

        Self {
            enqueue,
            dequeue,
            count,
            constructor: Some(Arc::new(constructor)),
        }
    }

    pub fn lease(&self) -> Result<PoolRef<O>> {
        if self.count == 0 {
            Ok(PoolRef {
                instance: Some(self.constructor.as_ref().unwrap()()),
                enqueue: None,
            })
        } else {
            let instance = Some(self.dequeue.recv().map_err(|_| ObjectError::Fatal)?);
            Ok(PoolRef {
                enqueue: Some(self.enqueue.clone()),
                instance,
            })
        }
    }

    pub fn count(&self) -> usize {
        self.count
    }
}

pub struct PoolRef<O> {
    enqueue: Option<mpsc::Sender<O>>,
    instance: Option<O>,
}

impl<O> PoolRef<O> {
    pub(crate) fn without_pool(instance: O) -> Self {
        Self {
            enqueue: None,
            instance: Some(instance),
        }
    }
}

impl<O> Drop for PoolRef<O> {
    #[inline(always)]
    fn drop(&mut self) {
        self.enqueue
            .take()
            .map(|e| e.send(self.instance.take().unwrap()));
    }
}

impl<O> Deref for PoolRef<O> {
    type Target = O;

    #[inline(always)]
    fn deref(&self) -> &Self::Target {
        self.instance.as_ref().unwrap()
    }
}

impl<O> DerefMut for PoolRef<O> {
    #[inline(always)]
    fn deref_mut(&mut self) -> &mut Self::Target {
        self.instance.as_mut().unwrap()
    }
}

impl<O> AsRef<O> for PoolRef<O> {
    #[inline(always)]
    fn as_ref(&self) -> &O {
        self.instance.as_ref().unwrap()
    }
}

impl<O> AsMut<O> for PoolRef<O> {
    #[inline(always)]
    fn as_mut(&mut self) -> &mut O {
        self.instance.as_mut().unwrap()
    }
}

impl<O> From<O> for PoolRef<O> {
    #[inline(always)]
    fn from(instance: O) -> Self {
        Self {
            instance: Some(instance),
            enqueue: None,
        }
    }
}