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  • Sharing business logic between server-side and client-side of web application?

    - by thoughtpunch
    Quick question concerning shared code/logic in back and front ends of a web application. I have a web application (Rails + heavy JS) that parses metadata from HTML pages fetched via a user supplied URL (think Pinterest or Instapaper). Currently this processing takes place exclusively on the client-side. The code that fetches the URL and parses the DOM is in a fairly large set of JS scripts in our Rails app. Occasionally want to do this processing on the server-side of the app. For example, what if a user supplied a URL but they have JS disabled or have a non-standard compliant browser, etc. Ideally I'd like to be able to process these URLS in Ruby on the back-end (in asynchronous background jobs perhaps) using the same logic that our JS parsers use WITHOUT porting the JS to Ruby. I've looked at systems that allow you to execute JS scripts in the backend like execjs as well as Ruby-to-Javascript compilers like OpalRB that would hopefully allow "write-once, execute many", but I'm not sure that either is the right decision. Whats the best way to avoid business logic duplication for apps that need to do both client-side and server-side processing of similar data?

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  • Breaking up classes and methods into smaller units

    - by micahhoover
    During code reviews a couple devs have recommended I break up my methods into smaller methods. Their justification was (1) increased readability and (2) the back trace that comes back from production showing the method name is more specific to the line of code that failed. There may have also been some colorful words about functional programming. Additionally I think I may have failed an interview a while back because I didn't give an acceptable answer about when to break things up. My inclination is that when I see a bunch of methods in a class or across a bunch of files, it isn't clear to me how they flow together, and how many times each one gets called. I don't really have a good feel for the linearity of it as quickly just by eye-balling it. The other thing is a lot of people seem to place a premium of organization over content (e.g. 'Look at how organized my sock drawer is!' Me: 'Overall, I think I can get to my socks faster if you count the time it took to organize them'). Our business requirements are not very stable. I'm afraid that if the classes/methods are very granular it will take longer to refactor to requirement changes. I'm not sure how much of a factor this should be. Anyway, computer science is part art / part science, but I'm not sure how much this applies to this issue.

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  • A generic Re-usable C# Property Parser utility [on hold]

    - by Shyam K Pananghat
    This is about a utility i have happened to write which can parse through the properties of a data contracts at runtime using reflection. The input required is a look like XPath string. since this is using reflection, you dont have to add the reference to any of your data contracts thus making pure generic and re- usable.. you can read about this and get the full c# sourcecode here. Property-Parser-A-C-utility-to-retrieve-values-from-any-Net-Data-contracts-at-runtime Now about the doubts which i have about this utility. i am using this utility enormously i many places of my code I am using Regex repeatedly inside a recursion method. does this affect the memmory usage or GC collection badly ?do i have to dispose this manually. if yes how ?. The statements like obj.GetType().GetProperty() and obj.GetType().GetField() returns .net "object" which makes difficult or imposible to introduce generics here. Does this cause to have any overheads like boxing ? on an overall, please suggest to make this utility performance efficient and more light weight on memmory

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  • What's the best way to manage reusable classes/libraries separately?

    - by Tom
    When coding, I naturally often come up with classes or a set of classes with a high reusability. I'm looking for an easy, straight-forward way to work on them separately. I'd like to be able to easily integrate them into any project; it also should be possible to switch to a different version with as few commands as possible. Am I right with the assumption that git (or another VCS) is best suited for this? I thought of setting up local repositories for each class/project/library/plugin and then just cloning/pulling them. It would be great if I could reference those projects by name, not by the full path. Like git clone someproject. edit: To clarify, I know what VCS are about and I do use them. I'm just looking for a comfortable way to store and edit some reusable pieces of code (including unit tests) separately and to be able to include them (without the unit tests) in other projects, without having to manually copy files. Apache Maven is a good example, but I'm looking for a language-independent solution, optimally command-line-based.

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  • Reuse an MVC area in multiple MVC applications?

    - by James Newton-King
    I have some common web pages that will be in multiple MVC applications. For those pages I'd like to reuse the same source code (controllers + views) between the different MVC web sites. What is the best way to go about doing this? ASP.NET MVC areas seem like one possibility but they just a sub directory of the website project. Is it possible to reuse an MVC area in multiple MVC applications?

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  • how to configure Firefox to automatically reuse the login credentials like IE

    - by Black Eagle
    Multiple HTTP Authentication Prompts in Firefox We are currently working on porting our application from Internet Explorer to Firefox and the application currently uses HTTP Digest Authentication. In case of Internet Explorer, the popup dialog to enter the Username/password appears only once and the entered login credentials are reused for subsequent HTTP requests to the web server. However in case of Firefox, the Authentication popups appears whenever the request is made to the Web Server. The Web Server used is Emweb Server. We would like to know how to configure Firefox to automatically reuse the login credentials like IE.

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  • Excel - Reuse a trend line to apply to other data

    - by milko
    I've obtained a trend line from a particular set of data. What I'd like to do now is to reuse this trend line to predict values from a given pair (x,y) of coordinates. To put it another way, I have one pair (x,y) that I know is correct for sure. I don't know any other point. Let's assume the behavior of this new set is similar to the one I've got the trend line from. Is there any way Excel could compute other points following this trend line?

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  • CUDA: How to reuse kernels in multiple files (for unit testing)

    - by zenna
    How can I go about reusing the same kernel without getting fatal linking errors due to defining the symbol multiple times In Visual Studio I get "fatal error LNK1169: one or more multiply defined symbols found" My current structure is as follows: Interface.h has an extern interface to a C function: myCfunction() (ala the C++ integration SDK example) Kernel.cu contains the actual __global__ kernels and is NOT included in the build: __global__ my_kernel() Wrapper.cu inlcudes Kernel.cu and Interface.h and calls my_kernel<<<...>>> This all works fine. But if I add another C function in another file which also includes Kernel.cu and uses those kernels, I get the errors. So how can I reuse the kernels in Kernel.cu among many C functions in different files. The purpose of this by the way is unit testing, and integrating my kernels with CPP unit, if there is no way to reuse kernels (there must be!) then other suggestions for unit testing kernels within my existing CPP unit framework would be appreciate. Thanks Zenna

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  • Why should I reuse XmlHttpRequest objects?

    - by Xavi
    From what I understand, it's a best practice to reuse XmlHttpRequest objects whenever possible. Unfortunately, I'm having a hard time understanding why. It seems like trying to reuse XHR objects can increase code complexity, introduce possible browser incompatibilities, and lead to other subtle bugs. After researching this question for a while, I did come up with a list of possible explanations: Fewer objects created means less garbage collecting Reusing XHR objects reduces the chance of memory leaks The overhead of creating a new XHR object is high The browser is able to perform some sort of network optimization under hood But I'm not sure if any of these reasons are actually valid. Any light you can shed on this question would be much appreciated.

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  • Remembering state: content offset and table cell reuse.

    - by Attacus
    I have a tableview with cells that have a scrollview in them. The scrollview is paged, 2 pages to be exact, and is meant to be able to quickly compare two small blocks of text. I'm trying to find a way to remember what the content offset of the scrollview is. Cell reuse is killing me. I've tried resetting the offset in prepareForReuse or directly in the cellForRowAtIndexPath, but it seems to give me exactly what you'd expect: Randomly offset tablecells after reuse. Anyone have any ideas?

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  • Best way to reuse a Runnable

    - by Gandalf
    I have a class that implements Runnable and am currently using an Executor as my thread pool to run tasks (indexing documents into Lucene). executor.execute(new LuceneDocIndexer(doc, writer)); My issue is that my Runnable class creates many Lucene Field objects and I would rather reuse them then create new ones every call. What's the best way to reuse these objects (Field objects are not thread safe so I cannot simple make them static) - should I create my own ThreadFactory? I notice that after a while the program starts to degrade drastically and the only thing I can think of is it's GC overhead. I am currently trying to profile the project to be sure this is even an issue - but for now lets just assume it is.

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  • Create div tag template and reuse

    - by user1683645
    Is it possible to create a template e.g with lots of other elements inside it with proper attribute "tagging" and reuse it with jquery? For instance when you want to display user submitted comments without refreshing the page. The reason I ask this is because the code between the div tags are rather long. So using for instance prepend() would be to long to rewrite. Whats the best approach for larger manipulations? Create a separate html? Im pretty new to manipulation, but since I have a programming background i would expect that there is an efficient way to reuse already existing HTML instead of redefining it in jquery.

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  • Using Diskpart in a PowerShell script won't allow script to reuse drive letter

    - by Kyle
    I built a script that mounts (attach) a VHD using Diskpart, cleans out some system files and then unmounts (detach) it. It uses a foreach loop and is suppose to clean multiple VHD using the same drive letter. However, after the 1st VHD it fails. I also noticed that when I try to manually attach a VHD with diskpart, diskpart succeeds, the Disk Manager shows the disk with the correct drive letter, but within the same PoSH instance I can not connect (set-location) to that drive. If I do a manual diskpart when I 1st open PoSH I can attach and detach all I want and I get the drive letter every time. Is there something I need to do to reset diskpart in the script? Here's a snippet of the script I'm using. function Mount-VHD { [CmdletBinding()] param ( [Parameter(Position=0,Mandatory=$true,ValueFromPipeline=$false)] [string]$Path, [Parameter(Position=1,Mandatory=$false,ValueFromPipeline=$false)] [string]$DL, [string]$DiskpartScript = "$env:SystemDrive\DiskpartScript.txt", [switch]$Rescan ) begin { function InvokeDiskpart { Diskpart.exe /s $DiskpartScript } ## Validate Operating System Version ## if (Get-WmiObject win32_OperatingSystem -Filter "Version < '6.1'") {throw "The script operation requires at least Windows 7 or Windows Server 2008 R2."} } process{ ## Diskpart Script Content ## Here-String statement purposefully not indented ## @" $(if ($Rescan) {'Rescan'}) Select VDisk File="$Path" `nAttach VDisk Exit "@ | Out-File -FilePath $DiskpartScript -Encoding ASCII -Force InvokeDiskpart Start-Sleep -Seconds 3 @" Select VDisk File="$Path"`nSelect partition 1 `nAssign Letter="$DL" Exit "@ | Out-File -FilePath $DiskpartScript -Encoding ASCII -Force InvokeDiskpart } end { Remove-Item -Path $DiskpartScript -Force ; "" Write-Host "The VHD ""$Path"" has been successfully mounted." ; "" } } function Dismount-VHD { [CmdletBinding()] param ( [Parameter(Position=0,Mandatory=$true,ValueFromPipeline=$false)] [string]$Path, [switch]$Remove, [switch]$NoConfirm, [string]$DiskpartScript = "$env:SystemDrive\DiskpartScript.txt", [switch]$Rescan ) begin { function InvokeDiskpart { Diskpart.exe /s $DiskpartScript } function RemoveVHD { switch ($NoConfirm) { $false { ## Prompt for confirmation to delete the VHD file ## "" ; Write-Warning "Are you sure you want to delete the file ""$Path""?" $Prompt = Read-Host "Type ""YES"" to continue or anything else to break" if ($Prompt -ceq 'YES') { Remove-Item -Path $Path -Force "" ; Write-Host "VHD ""$Path"" deleted!" ; "" } else { "" ; Write-Host "Script terminated without deleting the VHD file." ; "" } } $true { ## Confirmation prompt suppressed ## Remove-Item -Path $Path -Force "" ; Write-Host "VHD ""$Path"" deleted!" ; "" } } } ## Validate Operating System Version ## if (Get-WmiObject win32_OperatingSystem -Filter "Version < '6.1'") {throw "The script operation requires at least Windows 7 or Windows Server 2008 R2."} } process{ ## DiskPart Script Content ## Here-String statement purposefully not indented ## @" $(if ($Rescan) {'Rescan'}) Select VDisk File="$Path"`nDetach VDisk Exit "@ | Out-File -FilePath $DiskpartScript -Encoding ASCII -Force InvokeDiskpart Start-Sleep -Seconds 10 } end { if ($Remove) {RemoveVHD} Remove-Item -Path $DiskpartScript -Force ; "" } }

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  • IP address reuse on macvlan devices

    - by Alex Bubnoff
    I'm trying to create easy to use and possibly simple testing environment for some product and got some strange behaviour of macvlan's. What I'm trying to achieve: make a toolset for one-line start/stop of lxc containers(via docker) bound to external ip(I have enough of it on host machine). So, I'm doing something like this: docker run -d -name=container_name container_image pipework eth1 container_name ip/prefix_len@gateway and pipework here does this: GUEST_IFNAME=ph$NSPID$eth1 ip link add link eth1 dev $GUEST_IFNAME type macvlan mode bridge ip link set eth1 up ip link set $GUEST_IFNAME netns $NSPID ip netns exec $NSPID ip link set $GUEST_IFNAME name eth1 ip netns exec $NSPID ip addr add $IPADDR dev eth1 ip netns exec $NSPID ip route delete default ip netns exec $NSPID ip link set eth1 up ip netns exec $NSPID ip route replace default via $GATEWAY ip netns exec $NSPID arping -c 1 -A -I eth1 $IPADDR And it works for first time per IP. But for second time and later packets for containers IP isn't getting into container, while all configuration seem fine. So it looks like this: External machine ? ping 212.76.131.212 ....silence.... Host machine root@ubuntu:~# ip link show eth1 2: eth1: mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:15:17:c9:e1:c9 brd ff:ff:ff:ff:ff:ff root@ubuntu:~# ip addr show eth1 2: eth1: mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:15:17:c9:e1:c9 brd ff:ff:ff:ff:ff:ff root@ubuntu:~# tcpdump -v -i eth1 icmp tcpdump: WARNING: eth1: no IPv4 address assigned tcpdump: listening on eth1, link-type EN10MB (Ethernet), capture size 65535 bytes 00:00:46.542042 IP (tos 0x0, ttl 60, id 9623, offset 0, flags [DF], proto ICMP (1), length 84) 5.134.221.98 212.76.131.212: ICMP echo request, id 6718, seq 2345, length 64 00:00:47.549969 IP (tos 0x0, ttl 60, id 9624, offset 0, flags [DF], proto ICMP (1), length 84) 5.134.221.98 212.76.131.212: ICMP echo request, id 6718, seq 2346, length 64 00:00:48.558143 IP (tos 0x0, ttl 60, id 9625, offset 0, flags [DF], proto ICMP (1), length 84) 5.134.221.98 212.76.131.212: ICMP echo request, id 6718, seq 2347, length 64 00:00:49.566319 IP (tos 0x0, ttl 60, id 9626, offset 0, flags [DF], proto ICMP (1), length 84) 5.134.221.98 212.76.131.212: ICMP echo request, id 6718, seq 2348, length 64 00:00:50.573999 IP (tos 0x0, ttl 60, id 9627, offset 0, flags [DF], proto ICMP (1), length 84) 5.134.221.98 212.76.131.212: ICMP echo request, id 6718, seq 2349, length 64 ^C 5 packets captured 5 packets received by filter 0 packets dropped by kernel 1 packet dropped by interface Host machine, netns of container root@ubuntu:~# ip netns exec 32053 ip link show eth1 48: eth1@if2: mtu 1500 qdisc noqueue state UNKNOWN link/ether b2:12:f7:cc:a1:9d brd ff:ff:ff:ff:ff:ff root@ubuntu:~# ip netns exec 32053 ip addr show eth1 48: eth1@if2: mtu 1500 qdisc noqueue state UNKNOWN link/ether b2:12:f7:cc:a1:9d brd ff:ff:ff:ff:ff:ff inet 212.76.131.212/29 scope global eth1 inet6 fe80::b012:f7ff:fecc:a19d/64 scope link valid_lft forever preferred_lft forever root@ubuntu:~# ip netns exec 32053 tcpdump -v -i eth1 icmp tcpdump: listening on eth1, link-type EN10MB (Ethernet), capture size 65535 bytes ....silence.... ^C 0 packets captured 0 packets received by filter 0 packets dropped by kernel So, can anyone say, what can it be? Can this be caused by not a bug in macvlan implementation? Is there any tools I can use to debug that configuration?

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  • Storing Windows Updates for reuse

    - by Saiyine
    At work we update lots of computers using Windows Update. Windows XP and 7 all day long, rarely some Vista. We do it through a corporate proxy, as connecting them to a domain to build a Wsus server is out of the question, so we download about two gigabytes a day of the very same updates everyday. I've tried WSUS Offline. It's pretty complete but when it finishes it's common to be still missing hundreds of megabytes of updates, because its intention is not to fully update a system but to install the critical updates, as the developers explain in the forums. Now I'm trying with Autoupdater. It's far worse, with poor capabilities for non-English Windows XP, but at least it gives the option to install non critical updates in Windows 7. It still misses hundres of megabytes of updates after fully updating the system. And finally, both doesn't install the driver related updates of Windows 7, so they at most save us a couple of hundreds of megabytes and a reboot (with the associated login to the computer and to the proxy) out of three or four. So, is it possible to somewhat extract the installed updates in a Windows 7 system and not having to download the same updates again and again at least with machines with the same hardware? Or even better, a generic package with all the updates?

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  • Cut and Paste Code Reuse - JavaScript and C#

    - by tyndall
    What is the best tool(s) for tracking down "cut and paste reuse" of code in JavaScript and C#? I've inherited a really big project and the amount of code that is repeated throughout the app is 'epic'. I need some help getting handle on all the stuff that can be refactored to base classes, reusable js libs, etc... If it can plug into Visual Studio 2010, that would be an added bonus.

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  • Is there a way to reuse an XmlReader?

    - by uriDium
    I have a process that uses an XmlReader. I have already done a lot to squeeze maximum performance out of it. So far we have had huge gains from using the Reader as opposed to XmlDoc or DataSet.GetXml(). We expect to get XML many times a second and I would like to avoid the overhead of recreating the reader every time. I have already cached the XmlReaderSettings but is there anyway to reuse the XmlReader or do I need to recreate it every time?

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  • How to reuse layouts in WPF

    - by Ingó Vals
    I'm trying to create a application that will be tabbed where each tab will have a button area and a view area. Now each tab will essentially have the same layout just different things in the layout and I wanted to be able to reuse the same layout so that I won't have to change at many places ( it's just not good programming ). Can I accomplish this using resources or perhaps Styles. Please supply a light code example if possible.

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  • store everything only once, smarter

    - by hsmit
    In the digital world a lot is stored multiple times. As a thought experiment or creative challenge I want you to think about making this more efficient and maybe reuse more. Think of the following cases: an mp3 track is downloaded multiple times, copied over various devices on website a login form is often rebuild many times, why not reuse more code? words themselves are used many times questions and answers are accidentally saved at many places in parallel images or photos often describe the same data (Eiffel tower, Golden gate, Taj Mahal) etc etc Are you aware of solutions? Or are you thinking about similar topics? Ideas? Blueprints? I'd love to hear from you!

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  • extjs reuse object

    - by hafizan
    If I had: var x = new Ext.form.formPanel({ }); I wanted to reuse in two places, e.g.: var panel1 = new Ext.panel({ items:[x] }); var panel2 = new Ext.panel({ items:[x] }); Have try method Ext.extend but it did not work. If I do that it only renders one time on the page.

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  • javascript source code reuse

    - by vbNewbie
    I am not familiar with javascript and I have had some exposure to java but I found a web application that fits the goals of my app perfectly. The owner has provided the source by viewing the source in the html and I was wondering how hard it would be to reuse the code to deploy a similar app.

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