1 /* This Source Code Form is subject to the terms of the Mozilla Public
2  * License, v. 2.0. If a copy of the MPL was not distributed with this
3  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
4 
5 use dom::domexception::DOMErrorName;
6 use dom::filereader::{FileReader, TrustedFileReader, GenerationId, ReadMetaData};
7 use msg::constellation_msg::PipelineId;
8 use script_runtime::{CommonScriptMsg, ScriptThreadEventCategory, ScriptChan};
9 use std::sync::Arc;
10 use task::{TaskCanceller, TaskOnce};
11 use task_source::TaskSource;
12 
13 #[derive(JSTraceable)]
14 pub struct FileReadingTaskSource(pub Box<ScriptChan + Send + 'static>, pub PipelineId);
15 
16 impl Clone for FileReadingTaskSource {
clone(&self) -> FileReadingTaskSource17     fn clone(&self) -> FileReadingTaskSource {
18         FileReadingTaskSource(self.0.clone(), self.1.clone())
19     }
20 }
21 
22 impl TaskSource for FileReadingTaskSource {
queue_with_canceller<T>( &self, task: T, canceller: &TaskCanceller, ) -> Result<(), ()> where T: TaskOnce + 'static,23     fn queue_with_canceller<T>(
24         &self,
25         task: T,
26         canceller: &TaskCanceller,
27     ) -> Result<(), ()>
28     where
29         T: TaskOnce + 'static,
30     {
31         self.0.send(CommonScriptMsg::Task(
32             ScriptThreadEventCategory::FileRead,
33             Box::new(canceller.wrap_task(task)),
34             Some(self.1),
35         ))
36     }
37 }
38 
39 impl TaskOnce for FileReadingTask {
run_once(self)40     fn run_once(self) {
41         self.handle_task();
42     }
43 }
44 
45 #[allow(dead_code)]
46 pub enum FileReadingTask {
47     ProcessRead(TrustedFileReader, GenerationId),
48     ProcessReadData(TrustedFileReader, GenerationId),
49     ProcessReadError(TrustedFileReader, GenerationId, DOMErrorName),
50     ProcessReadEOF(TrustedFileReader, GenerationId, ReadMetaData, Arc<Vec<u8>>),
51 }
52 
53 impl FileReadingTask {
handle_task(self)54     pub fn handle_task(self) {
55         use self::FileReadingTask::*;
56 
57         match self {
58             ProcessRead(reader, gen_id) =>
59                 FileReader::process_read(reader, gen_id),
60             ProcessReadData(reader, gen_id) =>
61                 FileReader::process_read_data(reader, gen_id),
62             ProcessReadError(reader, gen_id, error) =>
63                 FileReader::process_read_error(reader, gen_id, error),
64             ProcessReadEOF(reader, gen_id, metadata, blob_contents) =>
65                 FileReader::process_read_eof(reader, gen_id, metadata, blob_contents),
66         }
67     }
68 }
69