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

use std::{fmt, time::Duration};

use super::BuildError;

/// [`Pool`] configuration.
///
/// [`Pool`]: super::Pool
#[derive(Clone, Copy, Debug)]
#[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
pub struct PoolConfig {
    /// Maximum size of the [`Pool`].
    ///
    /// [`Pool`]: super::Pool
    pub max_size: usize,

    /// Timeouts of the [`Pool`].
    ///
    /// [`Pool`]: super::Pool
    #[cfg_attr(feature = "serde", serde(default))]
    pub timeouts: Timeouts,
}

impl PoolConfig {
    /// Creates a new [`PoolConfig`] without any timeouts and with the provided
    /// `max_size`.
    #[must_use]
    pub fn new(max_size: usize) -> Self {
        Self {
            max_size,
            timeouts: Timeouts::default(),
        }
    }
}

impl Default for PoolConfig {
    /// Creates a new [`PoolConfig`] with the `max_size` being set to
    /// `cpu_count * 4` ignoring any logical CPUs (Hyper-Threading).
    fn default() -> Self {
        Self::new(num_cpus::get_physical() * 4)
    }
}

/// Timeouts when getting [`Object`]s from a [`Pool`].
///
/// [`Object`]: super::Object
/// [`Pool`]: super::Pool
#[derive(Clone, Copy, Debug)]
#[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
pub struct Timeouts {
    /// Timeout when waiting for a slot to become available.
    pub wait: Option<Duration>,

    /// Timeout when creating a new object.
    pub create: Option<Duration>,

    /// Timeout when recycling an object.
    pub recycle: Option<Duration>,
}

impl Timeouts {
    /// Create an empty [`Timeouts`] config (no timeouts set).
    #[must_use]
    pub fn new() -> Self {
        Self::default()
    }

    /// Creates a new [`Timeouts`] config with only the `wait` timeout being
    /// set.
    #[must_use]
    pub fn wait_millis(wait: u64) -> Self {
        Self {
            create: None,
            wait: Some(Duration::from_millis(wait)),
            recycle: None,
        }
    }
}

// Implemented manually to provide a custom documentation.
impl Default for Timeouts {
    /// Creates an empty [`Timeouts`] config (no timeouts set).
    fn default() -> Self {
        Self {
            create: None,
            wait: None,
            recycle: None,
        }
    }
}

/// This error is used when building pools via the config `create_pool`
/// methods.
#[derive(Debug)]
pub enum CreatePoolError<C, B> {
    /// This variant is used for configuration errors
    Config(C),
    /// This variant is used for errors while building the pool
    Build(BuildError<B>),
}

impl<C, B> fmt::Display for CreatePoolError<C, B>
where
    C: fmt::Display,
    B: fmt::Display,
{
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            Self::Config(e) => write!(f, "Config: {}", e),
            Self::Build(e) => write!(f, "Build: {}", e),
        }
    }
}

impl<C, B> std::error::Error for CreatePoolError<C, B>
where
    C: std::error::Error,
    B: std::error::Error,
{
}