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

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

use std::time::Duration;

pub enum RocketMQRuntime {
    Multi(tokio::runtime::Runtime),
}

impl RocketMQRuntime {
    pub fn new_multi(threads: usize, name: &str) -> Self {
        Self::Multi(
            tokio::runtime::Builder::new_multi_thread()
                .worker_threads(threads)
                .thread_name(name)
                .enable_all()
                .build()
                .unwrap(),
        )
    }
}

impl RocketMQRuntime {
    pub fn get_handle(&self) -> &tokio::runtime::Handle {
        match self {
            Self::Multi(runtime) => runtime.handle(),
        }
    }

    pub fn get_runtime(&self) -> &tokio::runtime::Runtime {
        match self {
            Self::Multi(runtime) => runtime,
        }
    }

    pub fn shutdown(self) {
        match self {
            Self::Multi(runtime) => runtime.shutdown_background(),
        }
    }

    pub fn schedule_at_fixed_rate<F>(
        &self,
        task: F,
        initial_delay: Option<Duration>,
        period: Duration,
    ) where
        F: Fn() + Send + 'static,
    {
        match self {
            RocketMQRuntime::Multi(runtime) => {
                runtime.handle().spawn(async move {
                    // initial delay
                    if let Some(initial_delay_inner) = initial_delay {
                        tokio::time::sleep(initial_delay_inner).await;
                    }

                    loop {
                        // record current execution time
                        let current_execution_time = tokio::time::Instant::now();
                        // execute task
                        task();
                        // Calculate the time of the next execution
                        let next_execution_time = current_execution_time + period;

                        // Wait until the next execution
                        let delay = next_execution_time
                            .saturating_duration_since(tokio::time::Instant::now());
                        tokio::time::sleep(delay).await;
                    }
                });
            }
        }
    }
}