handler | 易学教程

Calling Looper more than once causes “sending message to a Handler on a dead thread”

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问题 I am using an Executor [fixed thread pool] with my own ThreadFactory that adds a Looper: Handler HANDLER = new Handler(); Executor THREADS = Executors.newFixedThreadPool(THREAD_POOL_SIZE, new ThreadFactory() { @Override public Thread newThread(Runnable runnable) { return new MyThread(new Runnable() { @Override public void run() { Looper.prepare(); runnable.run(); } }); } }); private static class MyHandler extends Handler { public boolean fail; public void handleMessage(Message msg) { switch

removing object from game in Java (eclipse)

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问题 lets get right into it, i have a 'handler' class which is full of getters and setters and it includes in it code which adds and removes object, it looks like this: public void addObject(GameObject object){ this.object.add(object); } public void removeObject(GameObject object){ this.object.remove(object); Note that 'GameObject' is a class and all objects extend that class And then i create an object here, if(mouseOver(mx, my, 840/2-100, 149, 200, 64)){ game.gameState = STATE.Game; handler

SpringMVC执行流程

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参考文章: https://www.cnblogs.com/gxc6/p/9544563.html 一个请求发送到前端控制器，前端控制器把url给处理器映射器，让他匹配出一条handler的执行链，并返回给前端控制器。前端控制器拿到执行链后发送给处理器适配器让他去找可以处理此任务的后端处理器handler，被handler处理完后的视图模型再交给前端控制器，前端控制器把它交给视图解析器，来解析成视图。然后返回给用户。来源： https://www.cnblogs.com/macht/p/11831585.html

Does the memory get released when I throw an exception?

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I was debating with some colleagues about what happens when you throw an exception in a dynamically allocated class. I know that malloc gets called, and then the constructor of the class. The constructor never returns, so what happens to the malloc ? Consider the following example: class B { public: B() { cout << "B::B()" << endl; throw "B::exception"; } ~B() { cout << "B::~B()" << endl; } }; void main() { B *o = 0; try { o = new B; } catch(const char *) { cout << "ouch!" << endl; } } What happens to the malloced memory o , does it leak? Does the CRT catch the exception of the constructor and

Add/Remove handler to textbox

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I am adding a handler to textbox using the following code: private void frmLogin_Load(object sender, EventArgs e) { foreach (Control tb in this.Controls) { if (tb is TextBox) { TextBox tb1 = (TextBox)tb; tb1.KeyDown += new KeyEventHandler(TextBox_KeyDown); } } } I am also removing handler using the following code: private void frmLogin_FormClosed(object sender, FormClosedEventArgs e) { foreach (Control tb in this.Controls) { if (tb is TextBox) { TextBox tb1 = (TextBox)tb; tb1.KeyDown -= new KeyEventHandler(TextBox_KeyDown); } } } Is the correct way or is there a better alternative? It is good,

python中ProxyHandler处理器（代理）

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ProxyHandler处理器（代理）： 1.代理的原理：在请求目的网站之前，先请求代理服务器，然后让代理服务器去请求目的网站，代理服务器拿到目的网站的数据后，再发给我们的代码。 2. http://httpbin.org:这个网站可以方便的查看http请求的一些参数。 3.在代码中使用代理： *使用"urllib.request.ProxyHandler", 传入一个代理，这个代理是一个字典，字典的key是“http”或者“https”，字典的key依赖于代理服务器能够接收的类型,值是‘ip:port’*使用上一步创建的‘handler’,以及'request.bulid_opener'创建一个‘opener’ *使用上一步创建的'opener',调用‘open’函数，发起请求。实例代码如下： from urllib import request url=' http://www.httpbin.org/ip ' #1.使用proxyHanler,传入代理构建一个handler handler=request.ProxyHandler({"http":'39.137.2.242:8080'}) #2.使用上面创建的handler构建一个opener opener=request.build_opener(handler) #3.使用opener去发送一个请求 resp

android handler loop

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问题 can any one please tell me what is the problem with this logcat please 06-23 11:09:12.060: ERROR/AndroidRuntime(1116): FATAL EXCEPTION: Speedometer 06-23 11:09:12.060: ERROR/AndroidRuntime(1116): java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare() 06-23 11:09:12.060: ERROR/AndroidRuntime(1116): at android.os.Handler.<init>(Handler.java:121) 06-23 11:09:12.060: ERROR/AndroidRuntime(1116): at android.widget.Toast.<init>(Toast.java:68) 06-23 11:09

SpringMVC执行流程及底层剖析

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SpringMVC流程图如上面所示，根据上图，串联一下底层源码：　　1.在DispatcherServlet中找到doDisPatch 　　　　2.观察方法体，然后找到getHandler方法　　　　 3.点进方法，发现也是调用另一个getHandler方法　　　　 4.点进方法，发现是一个接口，然后我们进入其抽象类的 AbstractHandlerMapping 的 getHandler 方法：　　　　　　5.查看getHandlerExecutionChain方法　 protected HandlerExecutionChain getHandlerExecutionChain(Object handler, HttpServletRequest request) { //如果不是chain类型，将handler作为构造函数创建一个chain实例 HandlerExecutionChain chain = (handler instanceof HandlerExecutionChain ? (HandlerExecutionChain) handler : new HandlerExecutionChain(handler)); //获得有效url路径，用于匹配拦截器规则 String lookupPath = this.urlPathHelper

SpringMVC----执行流程+底层解析

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SpringMVC----执行流程+底层解析

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SpringMVC流程图如上面所示，根据上图，串联一下底层源码：　　1.在DispatcherServlet中找到doDisPatch 　　2.观察方法体，然后找到getHandler方法　　 3.点进方法，发现也是调用另一个getHandler方法　　 4.点进方法，发现是一个接口，然后我们进入其抽象类的 AbstractHandlerMapping 的 getHandler 方法：　　5.查看getHandlerExecutionChain方法　 protected HandlerExecutionChain getHandlerExecutionChain(Object handler, HttpServletRequest request) { //如果不是chain类型，将handler作为构造函数创建一个chain实例 HandlerExecutionChain chain = (handler instanceof HandlerExecutionChain ? (HandlerExecutionChain) handler : new HandlerExecutionChain(handler)); //获得有效url路径，用于匹配拦截器规则 String lookupPath = this.urlPathHelper

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