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| 1 | +use std::collections::HashMap; |
| 2 | +use std::path::PathBuf; |
| 3 | +use std::process::{Child, Command, Stdio}; |
| 4 | +use std::sync::Mutex; |
| 5 | + |
| 6 | +use tauri::AppHandle; |
| 7 | + |
| 8 | +use crate::widget_registry::get_widget_by_type; |
| 9 | + |
| 10 | +#[derive(Default)] |
| 11 | +pub struct JvmRuntimeManager { |
| 12 | + processes: Mutex<HashMap<String, Child>>, |
| 13 | +} |
| 14 | + |
| 15 | +impl JvmRuntimeManager { |
| 16 | + fn runtime_jar(app: &AppHandle, widget_type: &str) -> Result<PathBuf, String> { |
| 17 | + let item = get_widget_by_type(app, widget_type) |
| 18 | + .ok_or_else(|| format!("widget type not found in registry: {widget_type}"))?; |
| 19 | + if !item |
| 20 | + .runtime_language |
| 21 | + .as_deref() |
| 22 | + .is_some_and(|language| language.eq_ignore_ascii_case("java")) |
| 23 | + { |
| 24 | + return Err(format!("widget is not a Java runtime: {widget_type}")); |
| 25 | + } |
| 26 | + let entry = item |
| 27 | + .runtime_entry |
| 28 | + .ok_or_else(|| "Java runtime entry is missing".to_string())?; |
| 29 | + let manifest_entry = item |
| 30 | + .entry |
| 31 | + .ok_or_else(|| "widget manifest entry is missing".to_string())?; |
| 32 | + let parent = PathBuf::from(manifest_entry) |
| 33 | + .parent() |
| 34 | + .map(PathBuf::from) |
| 35 | + .ok_or_else(|| "widget manifest has no parent directory".to_string())?; |
| 36 | + let jar = parent.join(entry); |
| 37 | + if !jar.is_file() { |
| 38 | + return Err(format!("Java runtime JAR not found: {}", jar.display())); |
| 39 | + } |
| 40 | + Ok(jar) |
| 41 | + } |
| 42 | + |
| 43 | + pub fn start(&self, app: &AppHandle, widget_id: &str, widget_type: &str) -> Result<(), String> { |
| 44 | + self.stop(widget_id)?; |
| 45 | + let jar = Self::runtime_jar(app, widget_type)?; |
| 46 | + let mut command = Command::new("java"); |
| 47 | + command |
| 48 | + .arg("-jar") |
| 49 | + .arg(&jar) |
| 50 | + .current_dir(jar.parent().unwrap_or_else(|| std::path::Path::new("."))) |
| 51 | + .stdin(Stdio::null()) |
| 52 | + .stdout(Stdio::null()) |
| 53 | + .stderr(Stdio::null()); |
| 54 | + let child = command.spawn().map_err(|error| { |
| 55 | + format!( |
| 56 | + "failed to start JVM host; install Java {}: {error}", |
| 57 | + "runtime" |
| 58 | + ) |
| 59 | + })?; |
| 60 | + self.processes |
| 61 | + .lock() |
| 62 | + .map_err(|error| error.to_string())? |
| 63 | + .insert(widget_id.to_string(), child); |
| 64 | + Ok(()) |
| 65 | + } |
| 66 | + |
| 67 | + pub fn stop(&self, widget_id: &str) -> Result<(), String> { |
| 68 | + let mut processes = self.processes.lock().map_err(|error| error.to_string())?; |
| 69 | + if let Some(mut child) = processes.remove(widget_id) { |
| 70 | + let _ = child.kill(); |
| 71 | + let _ = child.wait(); |
| 72 | + } |
| 73 | + Ok(()) |
| 74 | + } |
| 75 | +} |
| 76 | + |
| 77 | +impl Drop for JvmRuntimeManager { |
| 78 | + fn drop(&mut self) { |
| 79 | + if let Ok(processes) = self.processes.get_mut() { |
| 80 | + for (_, mut child) in processes.drain() { |
| 81 | + let _ = child.kill(); |
| 82 | + let _ = child.wait(); |
| 83 | + } |
| 84 | + } |
| 85 | + } |
| 86 | +} |
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