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

use super::resource_id::{ResourceId, ResourceType, ResourceIdGenerator};

use mio::{Poll as MioPoll, Interest, Token, Events, Registry, Waker};
use mio::event::{Source};

use std::time::{Duration};
use std::sync::{Arc};
use std::io::{ErrorKind};

pub enum PollEvent {
    Network(ResourceId),
    Waker,
}

impl From<Token> for ResourceId {
    fn from(token: Token) -> Self {
        Self::from(token.0 >> Poll::RESERVED_BITS)
    }
}

impl From<ResourceId> for Token {
    fn from(id: ResourceId) -> Self {
        Token((id.raw() << Poll::RESERVED_BITS) | 1)
    }
}

pub struct Poll {
    mio_poll: MioPoll,
    events: Events,
    #[allow(dead_code)] //TODO: remove it with poll native event support
    waker: Arc<Waker>,
}

impl Default for Poll {
    fn default() -> Self {
        let mio_poll = MioPoll::new().unwrap();
        Self {
            waker: Arc::new(Waker::new(&mio_poll.registry(), Self::WAKER_TOKEN).unwrap()),
            mio_poll,
            events: Events::with_capacity(Self::EVENTS_SIZE),
        }
    }
}

impl Poll {
    const EVENTS_SIZE: usize = 1024;
    const RESERVED_BITS: usize = 1;
    const WAKER_TOKEN: Token = Token(0);

    pub fn process_event<C>(&mut self, timeout: Option<Duration>, mut event_callback: C)
    where C: FnMut(PollEvent) {
        loop {
            match self.mio_poll.poll(&mut self.events, timeout) {
                Ok(_) => {
                    for mio_event in &self.events {
                        let poll_event = match mio_event.token() {
                            Self::WAKER_TOKEN => {
                                log::trace!("POLL EVENT: waker");
                                PollEvent::Waker
                            }
                            token => {
                                let resource_id = ResourceId::from(token);
                                log::trace!("POLL EVENT: {}", resource_id);
                                PollEvent::Network(resource_id)
                            }
                        };

                        event_callback(poll_event);
                    }
                    break
                }
                Err(ref err) if err.kind() == ErrorKind::Interrupted => continue,
                Err(ref err) => Err(err).expect("No error here"),
            }
        }
    }

    pub fn create_registry(&mut self, adapter_id: u8, resource_type: ResourceType) -> PollRegistry {
        PollRegistry::new(adapter_id, resource_type, self.mio_poll.registry().try_clone().unwrap())
    }

    #[allow(dead_code)] //TODO: remove it with poll native event support
    pub fn create_waker(&mut self) -> PollWaker {
        PollWaker::new(self.waker.clone())
    }
}

pub struct PollRegistry {
    id_generator: Arc<ResourceIdGenerator>,
    registry: Registry,
}

impl PollRegistry {
    fn new(adapter_id: u8, resource_type: ResourceType, registry: Registry) -> Self {
        Self {
            id_generator: Arc::new(ResourceIdGenerator::new(adapter_id, resource_type)),
            registry,
        }
    }

    pub fn add(&self, source: &mut dyn Source) -> ResourceId {
        let id = self.id_generator.generate();
        self.registry.register(source, id.into(), Interest::READABLE).unwrap();
        log::trace!("Register to poll: {}", id);
        id
    }

    pub fn remove(&self, source: &mut dyn Source) {
        self.registry.deregister(source).unwrap()
    }
}

impl Clone for PollRegistry {
    fn clone(&self) -> Self {
        Self {
            id_generator: self.id_generator.clone(),
            registry: self.registry.try_clone().unwrap(),
        }
    }
}

#[allow(dead_code)] //TODO: remove it with poll native event support
pub struct PollWaker {
    waker: Arc<Waker>,
}

impl PollWaker {
    #[allow(dead_code)] //TODO: remove it with poll native event support
    fn new(waker: Arc<Waker>) -> Self {
        Self { waker }
    }

    #[allow(dead_code)] //TODO: remove it with poll native event support
    pub fn wake(&self) {
        self.waker.wake().unwrap();
        log::trace!("Wake poll...");
    }
}