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为AppInventor2开发拓展(Extension) · App Inventor 2 中文网

...环境配置 源码下载 代码编写 拓展编译 拓展导入,测试验证 « 返回首页 为什么需要开发拓展? App Inventor 2 是积木式在线安卓开发环境,利用拖拽式的方式实现代码块堆叠,从而完成相应的逻辑。 上手很容易,但是由...
https://www.tsingfun.com/it/tech/1102.html 

Java 反射最佳实践 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...主要是基于jOOR行编写的,如果想了解更多请查看这里的测试代码。 一、需求 今天一个“懒”程序员突然跑过来说:“反射好麻烦,我要提点需求。”听到这句话后我就知道,今天一定不好过了,奇葩需求又来了。 我们之前...
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Increasing the maximum number of TCP/IP connections in Linux

...se for the application that needs these sockets. Make sure to read post "Coping with the TCP TIME-WAIT" from Vincent Bernat to understand the implications. The net.ipv4.tcp_tw_recycle option is quite problematic for public-facing servers as it won’t handle connections from two different computers ...
https://www.tsingfun.com/it/tech/1087.html 

Http长连接200万尝试及调优 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...核来维护这相当大的数据结构,也是一种考验。 要完成测试,我们需要有一个服务端,还有大量的客户端。所以需要服务端程序与客户端程序。为达到目标,我的想法是这样的:客户端产生一个连接,向服务端发起一个请求,...
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数据存储组件 · App Inventor 2 中文网

...法删除会报错。 是否存在(作用域,路径) 测试在指定作用域内给出的路径是否存在。 是否是目录(作用域,路径) 测试在指定作用域内给出的路径是否是目录。 列出目录(作用域,目录名称) 获取给定目录中的文...
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Why must a lambda expression be cast when supplied as a plain Delegate parameter

...w = 5; string ip = UIF<string>(() => this.GetIp(row)); bool r = GoPingIt(ip); UIA(() => this.SetPing(i, r)); Maybe a bit lazy, but i don't have to setup worker done functions, which comes in super handy in cases such as this private void Ping_DoWork(object sender, System.ComponentMod...
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Display open transactions in MySQL

...tomatic reconnection does occur (for example, as a result of calling mysql_ping()), there is no explicit indication of it. To check for reconnection, call mysql_thread_id() to get the original connection identifier before calling mysql_ping(), then call mysql_thread_id() again to see whether the ide...
https://www.tsingfun.com/it/bigdata_ai/1073.html 

初窥InnoDB的Memcached插件 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术

...导入了一个名为innodb_memcached_config.sql的脚本,它除了导入测试数据外,还创建了Memcached插件所需要的配置信息: mysql> USE innodb_memcache mysql> SHOW TABLES; +---------------------------+ | Tables_in_innodb_memcache | +---------------------------+ | cache...
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What are the security risks of setting Access-Control-Allow-Origin?

...er directly as a DDoS node. (Most routers have test pages which allow for pings or simple HTTP server checks. These can be abused en masse.) – Brad Oct 31 '16 at 0:12 ...
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移动前端开发之viewport的深入理解 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...个东西,具体的情况可以看下这篇文章。 devicePixelRatio的测试结果: 三、PPK的关于三个viewport的理论 ppk大神对于移动设备上的viewport有着非常多的研究(第一篇,第二篇,第三篇),有兴趣的同学可以去看一下,本文中有...