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分布式系统的事务处理 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...指示这些节点是否要把操作结果进行真正的提交(比如将更新后的数据写入磁盘等等)。 两阶段提交的算法如下：
第一阶段：
协调者会问所有的参与者结点，是否可以执行提交操作。
各个参与者开始事务执行的准备工作：如...
StatusbarTools 扩展 - 状态栏自定义工具 · App Inventor 2 中文网
...源状态: 已开源
许可证: 开源许可证
注意: 此扩展不再更新，源代码已公开供开发者参考和修改。
相关资源
MIT App Inventor官方文档
扩展开发指南
其他状态栏扩展
本文档基于StatusbarTools扩展的论坛发布...
What is the strict aliasing rule?
...an example that should not be surprising (live example):
int x = 10;
int *ip = &x;
std::cout << *ip << "\n";
*ip = 12;
std::cout << x << "\n";
We have a int* pointing to memory occupied by an int and this is a valid aliasing. The optimizer must assume that assignments...
Net::SMTPAuthenticationError when sending email from Rails app (on staging environment)
...ethod = :smtp
config.action_mailer.default_url_options = { :host => "my.ip.addr.here" }
config.action_mailer.smtp_settings = {
:address => "smtp.gmail.com",
:port => 587,
:domain => 'my.ip.addr.here:80',
:user_name => "my_email_name@gmail.com",
:password ...
What are the Ruby Gotchas a newbie should be warned about? [closed]
...
Wikipedia Ruby gotchas
From the article:
Names which begin with a capital letter are treated as constants, so local variables should begin with a lowercase letter.
The characters $ and @ do not indicate variable data type as ...
How to write a scalable Tcp/Ip based server
...design phase of writing a new Windows Service application that accepts TCP/IP connections for long running connections (i.e. this is not like HTTP where there are many short connections, but rather a client connects and stays connected for hours or days or even weeks).
...
Difference between @import and link in CSS
...
The <link> directive can allow for multiple css be loaded and interpreted asyncronously.
the @import directive forces the browser* to wait until the imported script is loaded inline to the parent script before it can be correctly processed by it's engine, since t...
从网购到火车票，对比淘宝12306网为何如此烂？ - 大数据 & AI - 清泛网 - ...
...难度大得多，属于世界级难题。
3) 火车票的信息是实时更新的。网民的每次操作都必须到后台查询，实时生成新的火车票的状态信息。淘宝商品库存信息在促销期间不准确，这是服务端为了关键性能做妥协;但订火车票，库存信...
TCP loopback connection vs Unix Domain Socket performance
... the overhead of TCP (congestion control, flow control, stream management (IP packet ordering, retransmission, etc) ). Unix domain sockets do not do any of the above because it was designed from the ground up to be ran locally, meaning no congestion issues, no speed differences between server/client...
ADB Shell Input Events
...t; Developer Options > Check the option POINTER SLOCATION
..
Swipe X1 Y1 X2 Y2 [duration(ms)]:
adb shell input swipe 100 500 100 1450 100
in this example X1=100, Y1=500, X2=100, Y2=1450, Duration = 100ms
..
LongPress X Y:
adb shell input swipe 100 500 100 500 250
...