小结: 1. When a goroutine sends a value to a channel, we can view the goroutine releases the ownership of some values. When a goroutine receives a value from a channel, we can view the goroutine acquires the ownerships of some values. Surely, there may…

How to Gracefully Close Channels,这篇博客讲了如何优雅的关闭channel的技巧,好好研读,收获良多. 众所周知,在golang中,关闭或者向已关闭的channel发送数据都会引发panic. 谨遵优雅关闭channel的原则 不要在接受一端关闭channel 不要在有多个并发的senders中关闭channel.反过来说,如果只有一个协程充当sender,那么我们可以在这个sender协程内关闭掉channel. 一个简单的方法 SafeClose type M…

一.为什么要使用Channels 在Django中,默认使用的是HTTP通信,不过这种通信方式有个很大的缺陷,就是不能很好的支持实时通信.如果硬是要使用HTTP做实时通信的话只能在客户端进行轮询了,不过这样做的开销太大了. 因此,在1.9版本之后,Django实现了对Channels的支持,他所使用的是WebSocket通信,解决了实时通信的问题,而且在使用WebSocket进行通信的同时依旧能够支持HTTP通信. 二.创建一个Django Channels样例的完整流程 1. 首先下载相应插件…

有人把Go比作21世纪的C语言,第一是因为Go语言设计简单,第二,21世纪最重要的就是并行程序设计,而Go从语言层面就支持了并行. goroutine goroutine是Go并行设计的核心.goroutine说到底其实就是线程,但是它比线程更小,十几个goroutine可能体现在底层就是五六个线程,Go语言内部帮你实现了这些goroutine之间的内存共享.执行goroutine只需极少的栈内存(大概是4~5KB),当然会根据相应的数据伸缩.也正因为如此,可同时运行成千上万个并发任务.goro…

前言 Channels和Buffers是JAVA NIO里面比较重要的两个概念,NIO正是基于Channels和Buffers进行数据操作,且数据总是从Channels读取到Buffers,或者从Buffers写入到Channels. 通道(Channel) NIO中的通道与IO中的流类似,不过流是单向的,而通道是双向的.例如InputStream.OutputStream等都是单向的,一个流只能进行读数据或写数据:而FileChannel.SocketChannel等是双向的,既可以从中读数据…

[FROM:http://blog.mastykarz.nl/device-channels-sharepoint-2013/] One of the new features of SharePoint 2013 are Device Channels. Find out what they are, how they work and how you can leverage them in your solutions. Channels – it's all about the expe…

refer http://blogs.msdn.com/b/rds/archive/2007/09/20/dynamic-virtual-channels.aspx An important goal of the Terminal Services (TS) team is to provide a product that can easily be extended by third parties to better meet their needs.  While TS has alw…

如何取消图片透明度  本文永久地址为 http://www.cnblogs.com/ChenYilong/p/3989954.html,转载请注明出处. 当你试图通过<预览>进行"导出"操作时 (比如把jpg图片通过<预览>"导出"为png, 或者将png图片"导出"为png图片)时, 导出的图片默认包含透明度,这就会导致以下错误, (images contain alpha channels or transparenc…

Channels can be buffered. Provide the buffer length as the second argument to make to initialize a buffered channel: ch := make(chan int, 100) Sends to a buffered channel block only when the buffer is full. Receives block when the buffer is empty. Mo…

Channels are a typed conduit through which you can send and receive values with the channel operator, <-. ch <- v // Send v to channel ch. v := <-ch // Receive from ch, and // assign value to v. (The data flows in the direction of the arrow.) Lik…