1 /*
2  * Copyright (c) 2024 Huawei Device Co., Ltd.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at
6  *
7  *     http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 
16 //! This module is used to Asset service unload handler.
17 
18 /// Manages the unload request.
19 use std::sync::{Arc, Mutex};
20 
21 use ylong_runtime::task::JoinHandle;
22 
23 pub(crate) struct UnloadHandler {
24     task: Option<JoinHandle<()>>,
25 }
26 
27 pub(crate) static DELAYED_UNLOAD_TIME_IN_SEC: i32 = 20;
28 pub(crate) static SEC_TO_MILLISEC: i32 = 1000;
29 
30 impl UnloadHandler {
new() -> Self31     fn new() -> Self {
32         Self { task: None }
33     }
34 
35     /// Get the single instance of UnloadHandler.
get_instance() -> Arc<Mutex<UnloadHandler>>36     pub(crate) fn get_instance() -> Arc<Mutex<UnloadHandler>> {
37         static mut INSTANCE: Option<Arc<Mutex<UnloadHandler>>> = None;
38         unsafe { INSTANCE.get_or_insert_with(|| Arc::new(Mutex::new(UnloadHandler::new()))).clone() }
39     }
40 
41     /// update task in unload handler
update_task(&mut self, new_task: JoinHandle<()>)42     pub(crate) fn update_task(&mut self, new_task: JoinHandle<()>) {
43         if let Some(t) = &self.task {
44             t.cancel();
45         };
46         self.task = Some(new_task);
47     }
48 }
49