第一篇: vscode源码分析【一】从源码运行vscode
第二篇:vscode源码分析【二】程序的启动逻辑,第一个窗口是如何创建的
启动追踪
代码文件:src\main.js
如果指定了特定的启动参数:trace
vscode会在启动之初,执行下面的代码:
const contentTracing = require(‘electron‘).contentTracing;
const traceOptions = {
categoryFilter: args[‘trace-category-filter‘] || ‘*‘,
traceOptions: args[‘trace-options‘] || ‘record-until-full,enable-sampling‘
};
contentTracing.startRecording(traceOptions, () => onReady());
这段代码的主要目的是:从Chromium的内容模块收集跟踪数据,以查找性能瓶颈和程序执行缓慢的操作。
注意,这个操作只能在app.ready事件触发之后才能执行; startRecoding会异步请求所有子进程开始执行追踪操作;
一旦所有子进程都确认了主进程的请求,主进程就会执行startRecoding的回调方法;
结束追踪
在窗口成功启动之后,vscode结束了性能问题的追踪(如果30秒窗口还没启动,那么也会结束性能问题的追踪)
代码文件:vs\code\electron-main\app.ts
stopTracingEventually方法的代码为:
private stopTracingEventually(windows: ICodeWindow[]): void {
this.logService.info(`Tracing: waiting for windows to get ready...`);
let recordingStopped = false;
const stopRecording = (timeout: boolean) => {
if (recordingStopped) {
return;
}
recordingStopped = true; // only once
contentTracing.stopRecording(join(homedir(), `${product.applicationName}-${Math.random().toString(16).slice(-4)}.trace.txt`), path => {
if (!timeout) {
if (this.windowsMainService) {
this.windowsMainService.showMessageBox({
type: ‘info‘,
message: localize(‘trace.message‘, "Successfully created trace."),
detail: localize(‘trace.detail‘, "Please create an issue and manually attach the following file:\n{0}", path),
buttons: [localize(‘trace.ok‘, "Ok")]
}, this.windowsMainService.getLastActiveWindow());
}
} else {
this.logService.info(`Tracing: data recorded (after 30s timeout) to ${path}`);
}
});
};
// Wait up to 30s before creating the trace anyways
const timeoutHandle = setTimeout(() => stopRecording(true), 30000);
// Wait for all windows to get ready and stop tracing then
Promise.all(windows.map(window => window.ready())).then(() => {
clearTimeout(timeoutHandle);
stopRecording(false);
});
}
子进程会缓存跟踪数据,一般不会把跟踪数据发送给主进程(避免发送数据再造成性能消耗),
所以,结束跟踪也是主进程异步地要求所有子进程持久化跟踪数据的。
跟踪结束后,会执行stopRecording的回调函数。
在这里会显示一个提示框,提示用户性能追踪的结果;(如果超了30秒,那么久只记日志了)
原文地址:https://www.cnblogs.com/liulun/p/11044738.html
时间: 2024-10-09 08:54:04