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
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170

//! Broadcasts progress information among workers.

use std::rc::Rc;
use crate::progress::{ChangeBatch, Timestamp};
use crate::progress::{Location, Port};
use crate::communication::{Push, Pull};
use crate::logging::TimelyLogger as Logger;
use crate::logging::TimelyProgressLogger as ProgressLogger;
use crate::Message;

/// A list of progress updates corresponding to `((child_scope, [in/out]_port, timestamp), delta)`
pub type ProgressVec<T> = Vec<((Location, T), i64)>;
/// A progress update message consisting of source worker id, sequence number and lists of
/// message and internal updates
pub type ProgressMsg<T> = Message<(usize, usize, ProgressVec<T>)>;

/// Manages broadcasting of progress updates to and receiving updates from workers.
pub struct Progcaster<T:Timestamp> {
    to_push: Option<ProgressMsg<T>>,
    pushers: Vec<Box<dyn Push<ProgressMsg<T>>>>,
    puller: Box<dyn Pull<ProgressMsg<T>>>,
    /// Source worker index
    source: usize,
    /// Sequence number counter
    counter: usize,
    /// Sequence of nested scope identifiers indicating the path from the root to this subgraph
    addr: Rc<[usize]>,
    /// Communication channel identifier
    channel_identifier: usize,

    progress_logging: Option<ProgressLogger>,
}

impl<T:Timestamp+Send> Progcaster<T> {
    /// Creates a new `Progcaster` using a channel from the supplied worker.
    pub fn new<A: crate::worker::AsWorker>(worker: &mut A, addr: Rc<[usize]>, mut logging: Option<Logger>, progress_logging: Option<ProgressLogger>) -> Progcaster<T> {

        let channel_identifier = worker.new_identifier();
        let (pushers, puller) = worker.allocate(channel_identifier, addr.clone());
        logging.as_mut().map(|l| l.log(crate::logging::CommChannelsEvent {
            identifier: channel_identifier,
            kind: crate::logging::CommChannelKind::Progress,
        }));
        let worker_index = worker.index();
        Progcaster {
            to_push: None,
            pushers,
            puller,
            source: worker_index,
            counter: 0,
            addr,
            channel_identifier,
            progress_logging,
        }
    }

    /// Sends pointstamp changes to all workers.
    pub fn send(&mut self, changes: &mut ChangeBatch<(Location, T)>) {

        changes.compact();
        if !changes.is_empty() {

            self.progress_logging.as_ref().map(|l| {

                // Pre-allocate enough space; we transfer ownership, so there is not
                // an opportunity to re-use allocations (w/o changing the logging
                // interface to accept references).
                let mut messages = Box::new(Vec::with_capacity(changes.len()));
                let mut internal = Box::new(Vec::with_capacity(changes.len()));

                for ((location, time), diff) in changes.iter() {
                    match location.port {
                        Port::Target(port) => {
                            messages.push((location.node, port, time.clone(), *diff))
                        },
                        Port::Source(port) => {
                            internal.push((location.node, port, time.clone(), *diff))
                        }
                    }
                }

                l.log(crate::logging::TimelyProgressEvent {
                    is_send: true,
                    source: self.source,
                    channel: self.channel_identifier,
                    seq_no: self.counter,
                    addr: self.addr.to_vec(),
                    messages,
                    internal,
                });
            });

            for pusher in self.pushers.iter_mut() {

                // Attempt to reuse allocations, if possible.
                if let Some(tuple) = &mut self.to_push {
                    tuple.payload.0 = self.source;
                    tuple.payload.1 = self.counter;
                    tuple.payload.2.clear(); 
                    tuple.payload.2.extend(changes.iter().cloned());
                }
                // If we don't have an allocation ...
                if self.to_push.is_none() {
                    self.to_push = Some(Message::from_typed((
                        self.source,
                        self.counter,
                        changes.clone().into_inner().to_vec(),
                    )));
                }

                // TODO: This should probably use a broadcast channel.
                pusher.push(&mut self.to_push);
                pusher.done();
            }

            self.counter += 1;
            changes.clear();
        }
    }

    /// Receives pointstamp changes from all workers.
    pub fn recv(&mut self, changes: &mut ChangeBatch<(Location, T)>) {

        while let Some(message) = self.puller.pull() {

            let source = message.0;
            let counter = message.1;
            let recv_changes = &message.2;

            let addr = &mut self.addr;
            let channel = self.channel_identifier;

            // See comments above about the relatively high cost of this logging, and our
            // options for improving it if performance limits users who want other logging.
            self.progress_logging.as_ref().map(|l| {

                let mut messages = Box::new(Vec::with_capacity(changes.len()));
                let mut internal = Box::new(Vec::with_capacity(changes.len()));

                for ((location, time), diff) in recv_changes.iter() {

                    match location.port {
                        Port::Target(port) => {
                            messages.push((location.node, port, time.clone(), *diff))
                        },
                        Port::Source(port) => {
                            internal.push((location.node, port, time.clone(), *diff))
                        }
                    }
                }

                l.log(crate::logging::TimelyProgressEvent {
                    is_send: false,
                    source: source,
                    seq_no: counter,
                    channel,
                    addr: addr.to_vec(),
                    messages,
                    internal,
                });
            });

            // We clone rather than drain to avoid deserialization.
            for &(ref update, delta) in recv_changes.iter() {
                changes.update(update.clone(), delta);
            }
        }

    }
}