dispatcher | 易学教程

Error in C#: “An object reference is required for the non-static field, method, or property”

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问题 I wrote code in WPF. Firstly, I wrote a separate project to test work with a COM port device, and it worked well. Next I decided to integrate it in another project, but I get an error. I didn't change the code; I am just copied it into a new code file. This code works well: using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Windows; using System.Windows.Controls; using System.Windows.Data; using System.Windows.Documents; using System.Windows

聊聊dubbo的ExecutionDispatcher

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序本文主要研究一下dubbo的ExecutionDispatcher ExecutionDispatcher dubbo-2.7.3/dubbo-remoting/dubbo-remoting-api/src/main/java/org/apache/dubbo/remoting/transport/dispatcher/execution/ExecutionDispatcher.java public class ExecutionDispatcher implements Dispatcher { public static final String NAME = "execution"; @Override public ChannelHandler dispatch(ChannelHandler handler, URL url) { return new ExecutionChannelHandler(handler, url); } } ExecutionDispatcher实现了Dispatcher接口，其dispatch方法返回的是ExecutionChannelHandler ExecutionChannelHandler dubbo-2.7.3/dubbo-remoting/dubbo-remoting-api/src/main/java/org/apache

聊聊dubbo的AllDispatcher

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序本文主要研究一下dubbo的AllDispatcher Dispatcher dubbo-2.7.3/dubbo-remoting/dubbo-remoting-api/src/main/java/org/apache/dubbo/remoting/Dispatcher.java @SPI(AllDispatcher.NAME) public interface Dispatcher { /** * dispatch the message to threadpool. * * @param handler * @param url * @return channel handler */ @Adaptive({Constants.DISPATCHER_KEY, "dispather", "channel.handler"}) // The last two parameters are reserved for compatibility with the old configuration ChannelHandler dispatch(ChannelHandler handler, URL url); } Dispatcher接口定义了dispatch方法，返回ChannelHandler AllDispatcher dubbo-2.7.3/dubbo-remoting

Understanding the Silverlight Dispatcher

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I had a Invalid Cross Thread access issue, but a little research and I managed to fix it by using the Dispatcher. Now in my app I have objects with lazy loading. I'd make an Async call using WCF and as usual I use the Dispatcher to update my objects DataContext, however it didn't work for this scenario. I did however find a solution here . Here's what I don't understand. In my UserControl I have code to call an Toggle method on my object. The call to this method is within a Dispatcher like so. Dispatcher.BeginInvoke( () => _CurrentPin.ToggleInfoPanel() ); As I mentioned before this was not

[学习微服务-第3天] ServiceComb内置高性能网关服务

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Edge Service是ServiceComb提供的JAVA网关服务。Edge Service作为整个微服务系统对外的接口，向最终用户提供服务，接入RESTful请求，转发给内部微服务。Edge Service以开发框架的形式提供，开发者可以非常简单的搭建一个Edge Service服务，通过简单的配置就可以定义路由转发规则。同时Edge Service支持强大的扩展能力，服务映射、请求解析、加密解密、鉴权等逻辑都可以通过扩展实现。 Edge Service本身也是一个微服务，需遵守所有微服务开发的规则。其本身可以部署为多实例，前端使用负载均衡装置进行负载分发；也可以部署为主备，直接接入用户请求。开发者可以根据Edge Service承载的逻辑和业务访问量、组网情况来规划。开发微服务网关搭建框架使用ServiceComb的内置Edge Service边缘服务 3步完成搭建微服务网关 ↓↓↓ •配置依赖关系在项目中加入edge-core的依赖，就可以启动Edge Service的功能。Edge Service在请求转发的时候，会经过处理链，因此还可以加入相关的处理链的模块的依赖，下面的实例增加的负载均衡的处理链，这个是必须的。 •定义启动类和开发普通微服务一样，可以通过加载Spring的方式将服务拉起来。 •增加配置文件microservie.yaml Edge

?为什么要学这个技术（有什么优秀的地方，可以解决哪些问题？

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今天来总结一下Struts2的知识点，学习编程我的思路一般是这样的: 　　　　① why ?为什么要学这个技术（有什么优秀的地方，可以解决哪些问题？）。　　　　②what ? 这个技术是什么玩意？有什么牛逼的地方值得我们学习，这个技术的核心是什么。　　　　③How ？怎么学？基本技术都是自己自学的，我的学习思路就是，看视频，拿例子来学习知识，在敲代码的过程中理解问题。在此期间如果遇到不懂得或者是感觉很模糊的地方，及时的上网找相应的博客进行理解。基本上就是在敲代码中学习技术。并且对技术要及时的进行总结，但是我不推荐一个知识点总结一次，这样根本没有那么多的时间，最好的是看完之后，从全局出发，对整个知识进行积累和总结，在总结的过程中，多看一下其他人的博客，集思广益，收获会很大。　　　　④Do ！做！做是什么？是理论到实践的必经之路，是你成为大牛的必经之路，找个项目，认真的做完，对一些常用的技巧和方法进行归纳整理，发布到自己的博客上，在做项目的时候，有很多的途径，我最喜欢的是看视频了，只要你前面没偷懒，认真的学习了，在这个时候你就会发现都是so easy的事情。在做项目的时候，要注意的是，遇到不会的，或者是有新的理解一定要去探索，这样会知道的越来越多，同时为了防止遗忘，及时的对博客进行更新，或许你遇到的问题也可能是别人遇到的，这样你的人气值就上来了！　　比如对Struts2

How to return a value with Dispatcher.Invoke?

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问题 Anyone knows how to return a value from Dispatcher.Invoke in wpf? I want to return the selected index for a ComboBox. Thanks! 回答1: There's another way that returns value from Invoke(): object oIsLoaded = container.Dispatcher.Invoke( new Func<bool> ( () => { return container.IsLoaded; }) ); And by the way, chances are that the initial code (which is working with delegate) won't modify oIsLoaded at all; So I'd rather use a Func<> for returning a value from that kind of function. 回答2: int result

Dispatcher to Thread relationships in WPF

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It is not entirely clear to me how many Dispatchers there are in an application and how they are related to, or referenced from Threads. As I understand it, a WPF application has 2 threads (one for input, the other for UI) and 1 dispatcher (associated to the UI-Thread). What if I create another thread - let's call it "worker thread" - when I call Dispatcher.CurrentDispatcher on the worker thread, which dispatcher will i get? Another case: Assume a console application with 2 threads - the main thread, and an input-thread. On the main thread, I first create the input-thread and then i call

Deadlock when thread uses dispatcher and the main thread is waiting for thread to finish

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问题 Can someone please explain why this creates a deadlock, and how to solve it? txtLog.AppendText("We are starting the thread" + Environment.NewLine); var th = new Thread(() => { Application.Current.Dispatcher.Invoke(new Action(() => // causes deadlock { txtLog.AppendText("We are inside the thread" + Environment.NewLine); // never gets printed // compute some result... })); }); th.Start(); th.Join(); // causes deadlock // ... retrieve the result computed by the thread Explanation : I need my

How to update ObservableCollection from inside a BackgroundWorker using MVVM?

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问题 since two days I am trying to solve the following problem: I have a WPF control where a WrapPanel is bound to an ObservableCollection. An action changes the content of the ObservableCollection. The content is loaded in a BackgroundWorker. Immediately after the action that caused the content change, the new content is needed in a foreach-loop. The problem is that the loading of the content is slow, so it needs a bit to get ready. My first attempt was to wait for the backgroundworker until the

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