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How do servlets work? Instantiation, sessions, shared variables and multithreading
...tainer (like Apache Tomcat) starts up, it will deploy and load all its web applications. When a web application is loaded, the servlet container creates the ServletContext once and keeps it in the server's memory. The web app's web.xml and all of included web-fragment.xml files is parsed, and each &...
Where does the iPhone Simulator store its data?
I have a SQLite DB that I'm using to store app data, and I could do with taking a look inside it to debug a problem I'm having - but where does the iPhone Simulator store its data, typically?
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String concatenation in Ruby
... the usual way
With string interpolation
source = "#{ROOT_DIR}/#{project}/App.config"
with +
source = "#{ROOT_DIR}/" + project + "/App.config"
The second method seems to be more efficient in term of memory/speed from what I've seen (not measured though). All three methods will throw an uniniti...
Difference between add(), replace(), and addToBackStack()
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I think one approach could be to process the event in the top most fragment and call cancelEventDelivery() after processing is complete. You can find more about the cancelEventDelivery() methods here github.com/greenrobot/EventBus/blob/m...
When to call activity context OR application context?
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getApplicationContext() is almost always wrong. Ms. Hackborn (among others) have been very explicit that you only use getApplicationContext() when you know why you are using getApplicationContext() and only when you need to use ...
Microsoft Web API: How do you do a Server.MapPath?
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You can use HostingEnvironment.MapPath in any context where System.Web objects like HttpContext.Current are not available (e.g also from a static method).
var mappedPath = System.Web.Hosting.HostingEnvironment.MapPath("~/SomePath");
See also What is the ...
不同品牌的防火墙组成高可靠性集群 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...y
定义访问控制列表，permit选项为需要重定向的数据包
access-list 100 permit ip 172.16.100.0 0.0.0.255 any
access-list 110 permit ip 172.16.110.0 0.0.0.255 any
定义策略路由
route-map rs permit 10
match ip address 100
set ip next-hop verify-availabilit...
How to resize the iPhone/iPad Simulator?
...or using terminal commands
Close/Quit simulator. (if open)
Open Terminal app (using Spotlight search, Press ⌘ + SPACE to open spotlight search)
Copy following text and paste it next to terminal cursor.
defaults write ~/Library/Preferences/com.apple.iphonesimulator SimulatorWindowLastScale "0.3...
Real world use of JMS/message queues? [closed]
... access from a C#/Java/Ruby client.
A real world example is that of a web application that is used to place an order for a particular customer. As part of placing that order (and storing it in a database) you may wish to carry a number of additional tasks:
Store the order in some sort of third p...
How do you update Xcode on OSX to the latest version?
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Open up App Store
Look in the top right for the updates section (may also be in lefthand column "Updates"..)
Find Xcode & click Update
share
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