dispatcher | 易学教程

Dispatcher xps memory leak

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问题 I'm call a .net 4.0 dll from a vb6 app using com interop. In .net I create an xps document, via a xaml fixed document and save it to disk. This causes and memory leak and I've found a great solution here. Saving a FixedDocument to an XPS file causes memory leak The solution above, that worked for me, involves this line of code: Dispatcher.CurrentDispatcher.Invoke(DispatcherPriority.SystemIdle, new DispatcherOperationCallback(delegate { return null; }), null); What exactly is happening with

OKHttp源码解读

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> OKHttp源码解读本次分享主要目标 1.大概流程解读，同步流程，异步流程 2.Interceptor简读一、OKHttp的简单使用 private String get(String url) throws IOException { Request request = new Request.Builder() .url(url) .build(); Response response = client.newCall(request).execute(); return response.body().string(); } private void useOkHttp() throws IOException { //1.创建OkHttpClient对象 OkHttpClient okhttp = new OkHttpClient.Builder() .readTimeout(15, TimeUnit.SECONDS) .writeTimeout(15, TimeUnit.SECONDS) .build(); //2.创建请求对象Request Request request = new Request.Builder() .url("url") .addHeader("key","value")

Cannot use a DependencyObject that belongs to a different thread than its parent Freezable

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问题 WPF - I'm using BackgroundWorker to create a Model3D object, but when I want to add it to a Model3DGroup that is defined in the XAML, I get exception: Cannot use a DependencyObject that belongs to a different thread than its parent Freezable. This is the whole code behind: public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); BackgroundWorker bw = new BackgroundWorker(); bw.DoWork += bw_DoWork; bw.RunWorkerCompleted += bw_RunWorkerCompleted; bw.RunWorkerAsync

Akka messaging mechanisms by example

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问题 I have a fair amount of Apache Camel (routing/mediation/orchestation engine; lightweight ESB) experience and am racking my brain trying to understand the difference between Akka: Dispatchers ( Dispatcher , PinnedDispatcher , CallingThreadDispatcher ) Routers Pools Groups Event Buses According to the docs: Dispatchers are: ...is what makes Akka Actors “tick”, it is the engine of the machine so to speak. But that doesn't really explain what a dispatcher is or what it's relationship to an actor

又耗时6天-解决JNOJ(江南OJ)判题机dispatcher在Ubuntu18.04.3中不能自动启动的问题

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 环境 Windows server 2019 中的 Ubuntu server 18.04.3LTS 是VM 虚拟机 JNOJ搭建安装记录见: 耗时6天-JNOJ(江南OJ)搭建、安装记录问题现象 : 重启系统后终端提交后一直显示“等待测评” 重新启动服务器系统后，终端提交代码一直“等待测评”(pending)中当时临时的解决方法：每次系统启动后，手动运行判题机一次。如下2条命令： cd /home/judge/jnoj/judge sudo ./dispatcher 又经过6天的折腾终于找到了一种解决方法经过6天的折腾，安装了好多次JNOJ后，在网上文章的启发下终于解决了这个问题。解决步骤如下： samxiao@JNOJ:/home/judge/jnoj/judge$ sudo vi jnoj-judge.service samxiao@JNOJ:/home/judge/jnoj/judge$ sudo vi jnoj-start-judge.sh samxiao@JNOJ:/home/judge/jnoj/judge$ sudo chmod +x jnoj-start-judge.sh samxiao@JNOJ:/home/judge/jnoj/judge$ sudo systemctl

Dispatcher.BeginInvoke: Cannot convert lambda to System.Delegate

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问题 I'm trying to call System.Windows.Threading.Dispatcher.BeginInvoke . The signature of the method is this: BeginInvoke(Delegate method, params object[] args) I'm trying to pass it a Lambda instead of having to create a Delegate. _dispatcher.BeginInvoke((sender) => { DoSomething(); }, new object[] { this } ); It's giving me a compiler error saying that I can't convert the lambda to a System.Delegate. The signature of the delegate takes an object as a parameter and returns void. My lambda

No mapping found for HTTP request with URI?

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问题 Hi I have the following code: Controller: @Controller public class HelloWorldController { @RequestMapping("/hello") public ModelAndView HelloWorld() { String message = "My First SpringMVC Program "; return new ModelAndView("hello","message",message); } web.xml <servlet>  <servlet-name>spring</servlet-name> <servlet-class>org

Why is my asynchronous task freezing AI animations in the GUI?

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问题 My code looks pretty much like the following: namespace CloudKey { /// <summary> /// Interaction logic for Page1.xaml /// </summary> public partial class Page1 : Page { public Page1() { InitializeComponent(); } private async void button_Click(object sender, RoutedEventArgs e) { //Begin Loading animation Loading.Visibility = Visibility.Visible; //Run Task await Task.Run(() => LoginCheck()); } async void LoginCheck() { await Dispatcher.InvokeAsync( () => { InitialSessionState iss =

Calling the pose triggered event using Myo arm band

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问题 I'm developing a project in WPF using a Myo arm band which works so far in recognizing the device has connected and updates info to the textbox, but when I set up the event handler for recognizing if a pose is triggered the event never fires. I debugged this by making poses with the device and holding them, also I set a break point on this line pose.Triggered += Pose_Triggered; and the start of the pose triggered event. The break point triggers on the first line where the but it doesn't

Clever event accessors - to fire handlers on the thread they were registered?

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问题 Have just had an idea, I haven't seen it before, wondering if you guys thought it was a good idea, if it exists, any common pitfalls etc. - and also how to implement it. There are several times I've found myself subscribing to an event from the UI thread that will be called from a different thread - for example, notification of a service call completing. 'My' idea would be to store the current Dispatcher in the add block along with the handler delegate, then when the event is 'fired', perform