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• What are the responsibilities of the data layer?

  - by alimac83

  I'm working on a project where I had to add a data layer to my application. I've always thought that the data layer is purely responsible for CRUD functions ie. shouldn't really contain any logic but should simply retrieve data for the business layer to manipulate. However I'm a little confused with my project because I'm not sure whether I've structured my app correctly for this scenario. Basically I'm trying to retrieve a list of products from the database that fall within a certain pricing threshold. At the moment I have a function in my data layer that basically returns all products where price min threshold and price < max threshold. But it got me thinking that maybe this is incorrect. Should the data layer simply return a list of ALL products and then the business logic do the filtering? I'm pretty confused over whether the data layer should simply provide methods that allow the business layer to get raw data or whether it should be responsible for getting filtered data too? If anyone has an article or something explaining this in detail it'd be very helpful. Thanks

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• How does one implement storage/retrieval of smart-search/mailbox features?

  - by humble_coder

  Hi All, I have a question regarding implementation of smart-search features. For example, consider something like "smart mailboxes" in various email applications. Let's assume you have your data (emails) stored in a database and, depending on the field for which the query will be created, you present different options to the end user. At the moment let's assume the Subject, Verb, Object approach… For instance, say you have the following: SUBJECTs: message, to_address, from_address, subject, date_received VERBs: contains, does_not_contain, is_equal_to, greater_than, less_than OBJECTs: ??????? Now, in case it isn't clear, I want a table structure (although I'm not opposed to an external XMLesque file of some sort) to store (and later retrieve/present) my criteria for smart searches/mailboxes for later use. As an example, using SVO I could easily store then reconstruct a query for "date between two dates" -- simply use "date greater than" AND "date less than". However, what if, in the same smart search, I wanted a "between" OR'ed with another criterion? You can see that it might get out of hand -- not necessarily in the query creation (as that is rather simplistic), but in the option presentation and storage mechanism. Perhaps I need to think more on a more granular level. Perhaps I need to simply allow the user to select AND or OR for each entry independently instead of making it an ALL OR NOTHING type smart search (i.e. instead of MATCH ALL or MATCH ANY, I need to simply allow them to select -- I just don't want it to turn into a Hydra). Any input would be most appreciated. My apologies if the question is a bit incoherent. It is late, and I my brain is toast. Best.

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• Ajax and JSF 1.1 using hidden iframe with "proxy forms", what do you think about this development st

  - by Steel Plume

  Hi, currently I am using yet 1.1 specs, so I am trying to make simple what is too complex for me :p, managing backing beans with conflicting navigation rules, external params breaking rules and so on... for example when I need a backing bean used by other "views" simply I call it using FacesContext inside other backing beans, but often it's too wired up to JSF navigation/initialization rules to be really usable, and of course more simple is more useful become the FacesContext. So with only a bit of cross browser Javascript (simply a form copy and a read-write on a "proxy" form), I create a sort of proxy form inside the main user page (totally disassociated from JSF navigation rules, but using JSF taglibs). Ajax gives me flexibility on the user interaction, but data is always managed by JSF. Pratically I demand all "fictious" user actions to an hidden "iframe" which build up all needed forms according JSF rules, then a javascript simply clone its form output and put it into the user view level (CSS for showing/hiding real command buttons and making pretty), the user plays around and when he click submit, a script copies all "proxied" form values into the real JSF form inside the "iframe" that invokes the real submit of the form, what it returns is obviously dependent by your choice. Now JSF is really a pleasure :-p My real interest is to know what are your alternative strategy for using pure Ajax and JSF 1.1 without adopting middle layer like ajax4jsf and others, all good choices but too much "plugins" than specs.

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• Best way to import a pack or "system" of new classes??

  - by Joe Blow

  Here's an Advanced question for Advanced developers. So I've written a largish "subsystem". It is essentially a UIViewController called CleverViewController which is a UIViewController. Now, there are a large number of supporting classes (about ten) that do the hard work: perform math functions, image processing, purely logical functions, build images or what have you with thousands of lines of code. (To do this, I simply started a new XCode project / app "Scratchpad" which does little other than load and launch the CleverViewController. So currently it works as an app, which launches CleverViewController. The ten or so classes I mention that are part of the "subsystem" simply sit there in that project/app.) So now, we will use CleverViewController, the new technology generally, in various apps. (Or perhaps friends would want to use it, etc.) What's the best way to "do" this? Have I screwed everything up, and really it should just be ONE (pretty big) class rather than a dozen classes? (I could understand that then as I would simply add that new (big) class where needed, like adding any other class.) Do I have to make a "framework" like the Apple frameworks? (If so, what the hell are they, how do you do it, etc?!?) In fact, do you just have to lamely include all of the dozen classes and that's that (obviously perhaps putting them in a grouped subfolder). What about all the headers and so on? (Currently I just have the dozen includes in the pch file of the scratchpad project.) Shouldn't it be easy to "maintain" this "subsystem" separately and so on? I'm afraid I know nothing about this: if the answer is obvious, hit me over the head and let me know. Thank you for any info on this !

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• rails route question

  - by badnaam

  I am trying to build a search functionality which at a high level works like this. 1 - I have a Search model, controller with a search_set action and search views/partial to render the search. 2 - At the home page a serach form is loaded with an empty search object or a search object initialized with session[:search] (which contains user search preferences, zip code, proximity, sort order, per page etc). This form has a post(:put) action to search_set. 3 - When a registered user performs a set the params of the search form are collected and a search record is saved against that user. If a unregistered user performs a search then the search set action simply stores the params in the session[:search]. In either case, the search is executed with the given params and the results are displayed. At this point the url of in the location bar is something like.. http://localhost:3000/searches/search_set?stype=1 At this point if the user simply hits enter on the location bar, I get an error that says "No action responded to show" I am guessing because the URL contains search_set which uses a put method and even though I have a search_show (:get) action (which simply reruns the search in the session or saved in the database) does not get called. How can I handle this situation where I can route a user hitting enter into the location bar to a get method? If this does not explain the problem , please let me know I can share more details/code etc. Thanks!

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• PERC H710 mini raid controller advanced settings (BIOS)

  - by gregg

  I upgraded from a PERC h310 to an H710 controller on my Dell R620 but didnt get any increase in performance. This is a ESXi host with a 5 disk RAID 5. I noticed when going to the RAID BIOS that the advanced settings section was not activated/checked off. In that section is the strip element size: 64kb (default) read policy: no read ahead and the write policy: write-through. Will checking that section do any harm to the existing raid array or will it simply enable those policies and hopefully boost performance? Or, lastly, is it already using those policies and the checkmark is simply to activate them for changes

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• Simple Backup Strategy for Amazon EC2 instances / volumes?

  - by minerj

  You have entered Introductory Backups for Amazon EC2 EBS-backed Windows Images 010... I have been browsing my brains out to find a simple backup strategy for our single windows 2008 server running SharePoint Services. This is an EBS-backed image of one server with one data volume. I don’t need anything exotic. I only need a “daily” backup (losing a day’s worth of data is not catastrophic). We have created and saved an EBS backed AMI image (Windows 2008) we are comfortable using. We started off making backups by simply creating a new EBS AMI image. This is really simple, but the running server is put offline during the first 10 – 15 minutes of creating the image – not ideal. The standard way of creating backups would seem to be creating snapshots of volumes attached to a running instance. Again it’s pretty simple and the server remains usable during the snapshot generation. The apparent Catch-22 is that you can’t simply launch a new instance directly from a snapshot. I know how to bundle a running instance to S3 storage and then register the AMI from the S3 bucket. This does allow me to capture a backup of a running instance and, if the running instance is lost, register the AMI from the S3 bucket and launch the new AMI to recover the instance, but this seems really convoluted and it seems ridiculous to have to juggle back and forth between the AWS Console and the S3 Organizer plug-in for Firefox to get this accomplished. (Please don't mention the command line approach, this is an 010 level course). From playing around with EBS-backed images, the following approach appears to work for me (all done within the AWS Console): 1.For your backups, simply snapshot the system volume (/dev/sda1) as needed. 2.If you lose your running instance, do the following: a.Create a new volume from your last snapshot backup b.Launch another instance of your starting AMI (must be EBS-backed) c.Stop this instance. d.Detach the existing system volume from the new stopped instance and discard. e.Attach the newly created volume as system volume (/dev/sda1) to the stopped instance. f.Re-start the new instance. I have tested this out a couple of times and it seems to work for me. Question: Is there anything wrong with this approach?

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• Grep a strange acirc character

  - by John Hunt

  I have this character appearing in places in some files I have:  (if you can't see it or it looks like a question mark it's the Acirc character (capital A with a circumflex over it)) I simply want to grep replace this char with a space, however when I do this: grep --color -ri  myproject.php Putty gets very confused, as does grep. As I understand it there's probably a way to use an escaped hex code with grep.. does anyone know how? EDIT: The character is showing up on my web page as a weird <?>. The http headers for the page specify utf-8 as does the meta character set and I still see the strange character. In putty it appears as a space (putty also set to utf-8.) When I copy from vim and paste into grep it simply doesn't find it. Cheers, John

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• How do I make Chrome's Omnibar behave more like the Firefox Awesome bar?

  - by Agnel Kurian

  One of my favorite features of the Firefox awesome bar is that I can simply type a substring of any URL or page title in my history and it finds all matches sorted by how frequently they were accessed. Example: I simply type "ask" when I want to ask something on stackoverflow.com., "inbox" goes to my GMail Inbox and so on because the substring matches any part of the URL or the page title. Chrome's Omnibar is quite frustrating in this area. I am not able to predict what it's gonna fetch and I seem to have no way to train the thing to do my bidding. I have turned unchecked the option that says: "Use a suggestion service to help complete searches and URLs typed..." but there has been no noticeable improvement. Any clues how I can make the Omnibar behave?

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• Eee PC - Create USB Recovery Drive w/ Files Copied From Recovery Partition

  - by nedm

  I have an Eee PC 1005HAB whose hard disk has failed. I have no recovery CD/DVD, but I did previously back up the contents of the recovery partition, and would like to use them to create a bootable USB to reinstall the factory settings on the new hard drive. Since I simply copied all the files in the recovery partition, rather than hitting F9 during boot and running through the process to create a recovery disk or drive, how do I now use the files to create a bootable USB drive that will do the recovery? In the BIOS I have disabled boot booster and set external drives to the top of the boot priority, but simply copying all the recovery partion files to a usb doesn't allow it to be booted from. I've downloaded the HP utility for creating bootable USB drives and have tried using it to make the USB drive bootable, but I'm not sure what to do with the ghost image and utilities from the recovery partition to get the process to start properly. Thanks in advance for any help.

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• Linux: Simulate Serial Connection from Arduino

  - by shanet

  I'm trying to simulate the serial connection from an Arduino into a Processing applet since I don't have an Arduino at the moment. Simply, I'm trying to just send bytes from Bash to a serial connection (on /dev/ttyS0) which the Processing applet will pick up like it would from an Arduino. I tried the answer to this question: How can I send data to the serial port from a Linux shell?, but it's simply not working and I don't know how to go about debugging something like this since I've never played with serial connections before. Any advice? Thanks much.

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• Make Chrome's Omnibar behave more like the Firefox AwesomeBar

  - by Agnel Kurian

  One of my favorite features of the Firefox AwesomeBar is that I can simply type a substring of any URL or page title in my history and it finds all matches sorted by how frequently they were accessed. Example: I simply type "ask" when I want to ask something on stackoverflow.com., "inbox" goes to my GMail Inbox and so on because the substring matches any part of the URL or the page title. Chrome's Omnibar is quite frustrating in this area. I am not able to predict what it's gonna fetch and I seem to have no way to train the thing to do my bidding. I have unchecked the option that says: "Use a suggestion service to help complete searches and URLs typed..." but there has been no noticeable improvement. Any clues how I can make the Omnibar behave?

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• Dialog box keeps asking for password

  - by hossam-khalili

  I am running Windows 7, Outlook 2007 (Office 2007 pro) and I'm connecting to our Exchange Server 2007 which is part of Small Business Server 2008. Outlook 2007 on one client keeps asking for the password to the remote access URL. If I simply click cancel it's OK for a few minutes. Entering the password and clicking the save PW box does no good. Sometimes clicking cancel results in another dilog box asking the same thing and I may have to click cancel several times to get it to go away for a while. Occasionally Outlook may actually go into a mode where it says it needs the password typed so I click the link which brings the dialog back but simply clicking cancel will make Outlook connect again. Can anyone help me? Thanks!

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• sharepoint administrative server not started causing sharepoint deployment instability

  - by Nathan

  When i deploy anything to a variety of sharepoint servers i get problems with some packages failing, from what i can see the only error given is as below. The timer job for this operation has been created, but it will fail because the administrative service for this server is not enabled. If the timer job is sched uled to run at a later time, you can run the jobs all at once using stsadm.exe - o execadmsvcjobs. To avoid this problem in the future, enable the Windows ShareP oint Services administrative service, or run your operation through the STSADM.e xe command line utility. Is this a known problem? I googled for the text but got only one other person with the problem who simply worked round it. I'm trying to batch deploy solutions programmatically and so these errors render the whole code worthless if you have to go back and redo bits by hand afterwards. Is batch deployment simply not possible? Thanks!

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• Combine Multiple Audio Files into a single higher-quality audio File

  - by namenlos

  BACKGROUND My team gave a demo to a large audience - we recorded the audio of the demo in multiple locations in the room (3) the audio was recorded using cheap laptop microphones I was not involved in the recording of the audio or the demo Both audio files suck in some form the first one is of a recording near the speaker - which clearly gets his voice but the the audience is audience is muffled - also this one is slightly noisy The second recording was done in the middle of the audience - it gets the audience questions clearly but actually gets the speaker rather sometimes well and sometimes poorly (not all the speakers spoke loudly enough to be heard) MY QUESTION Is there any techinque or software which can be used to merge these audio files in such a way that the best qualities of each are preserved. I am NOT asking now to simply merge them together in one track - I've already done that in Audacity and it is certainly better - what I am looking for could be considered closer to how HDR images are created - multiple exposures combined into an enhanced new version which is not simply an average of the inputs. NOTE Am not an "Audio" guy - just a normal user

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• dilog box keep asking for password

  - by hossam-khalili

  I'm having the exact same problem. I am running Windows 7, Outlook 2007 (Office 2007 pro) and I'm connecting to our Exchange Server 2007 which is part of Small Business Server 2008 Outlook 2007 on a client keeps asking for the password to the remote access URL. If I simply click cancel it's OK for a few minutes. Entering the password and clicking the save PW box does no good. Sometimes clicking cancel results in another dilog box asking the same thing and I may have to click cancel several times to get it to go away for a while. Occasionally Outlook may actually go into a mode where it says it needs the password typed so I click the link which brings the dilog back but simply clicking cancel will make Outlook connect again. can anyone help me thanks

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• Removing Exchange 2010 and SBS2011 gracefully after migration to Server 2008 Std R2

  - by user145275

  We have recently completed a server replacement for a customer. They had SBS2011 using Exchange 2010. They now have Server 2008 Std R2 and Google Apps email. We have migrated the DHCP, DNS, Filserver and all 5 FSMO roles to the new 2008 R2 server (today). During the grace period for SBS2011 we intend to decomission the old server completely. Previous experience would suggest uninstalling Exchange 2010 then demote SBS2011 then remove from the domain and switch off. Can I simply demote SBS2011 without removing Exchange? Can't really find any walkthroughs on this. My concern is that if we simply turn off SBS2011 the AD is left in a mess with legacy Exchange objects making any potential reintroduction of Exchange difficult in future, plus I want to do it the right way!

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• Mac and windows 7 file sharing specific user

  - by all-R

  Hi guys, I try to share a specific directory to my windows 7 computer, but I want it to use a specific user that I created on my mac to connect to it. I saw this tutorial: http://www.trickyways.com/2010/06/how-to-access-mac-files-from-windows-7/ wich is exactly what I want to do, but it ain't working. For some reason, it never prompts me for username/password when I try to connect on my mac when I'm on Windows 7. On top of that, when I set the permission "No Access" to the "Everyone" user on my mac, my windows computer simply don't see the directory. If I set the permission to "Read/Write" or "Read only" it works. I simply don't want that everyone in my workgroup to be able to read my files. I want to create specific users on my mac and share them to the persons I want... Any thoughts?

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• Latitude XT2 Battery issue

  - by Multi_Mark

  I received the add-on battery yesterday and put it in side my new lattitude xt2 but it would not recognize the battery. the laptop simply flashed yellow and the battery itself when the white battery level indicator was pressed just flashed green i left it plugged in overnight and its still the same issue. it will not charge. i removed and re-inserted the battery several times to make sure the plug in was properly connected but still no luck. is there a trick to this? or some way i can make this work? or is it simply defective?

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• Cannot seem to disable ability to view temporary internet files via group policy

  - by user162707

  Windows XP Pro SP3, IE8 (8.0.6001.18702), within local gpedit.msc I did the below: User Config/Admin Temp/Windows Comp/IE enabled: disable changing temporary internet file settings User Config/Admin Temp/Windows Comp/IE/Delete Browsing History enabled all (11 items) However there is a loophole that lets me still wipe history & other files via: Tools, Internet Options, Browsing History, Settings, View Objects, delete everything, hit up arrow, go to History (hidden folders has to be on), delete everything Only way around this I can see is to disable General Internet Options Page via group policy, setup NTFS folder restrictions on that temp internet files (worried about adverse affects like not being able to store them), or further grind-down group policy somewhere else to prevent deleting files. Just odd group policy wouldn't have a settings to simply disable the Browser History Settings button (as it further shows the location which a user could just go to). So just curious if someone can confirm maybe this is simply not available in group policy & their suggested action

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• Redirect output of Python program to /dev/null

  - by STM

  I have a Python executable, written and compiled by somebody else, that I simply need to run once halfway down my own bash script. The program uses a text-based UI, therefore waits for input before proceeding, but the key operations it performs when starting are required in my bash script. A messy (and strange) procedure I know, but unfortunately I haven't got any other options. I've gotten around forcefully closing the program with a kill signal, but the program's TUI insists on outputting to wherever it's run. I've tried redirecting both stdout and stderr to /dev/null and running the program in the background by suffixing an ampersand, but simply can't get it to play ball. I believe the cause is the program spawns other processes, and the output redirection of the parent process doesn't affect them. Is there any trick I can utilise to redirect all output from child processes too?

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• Terminal app on Mac OS X - normal keys

  - by Matthew

  There are some default terminal things different for the Mac (for example, Command C to copy and Command V to paste rather than simply highlighting/right clicking). These are fine with me. What bothers me though is I can't figure out how to click or use the F keys. The main app I have problems with is htop. Htop supports clicking on column names to sort, etc. Also, to exit the app, you are supposed to press F10. But F10 simply mutes my volume. I've tried different combinations of things like alt F10. I usually have to quit htop by pressing CTRL-C Any ideas on how to get normal terminal behaviors? Normal meaning linux

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• How to securely delete files stored on a SSD?

  - by Chris Neuroth

  From a (very long, but definitely worth to read) article on SSDs: When you delete a file in your OS, there is no reaction from either a hard drive or SSD. It isn’t until you overwrite the sector (on a hard drive) or page (on a SSD) that you actually lose the data. File recovery programs use this property to their advantage and that’s how they help you recover deleted files. The key distinction between HDDs and SSDs however is what happens when you overwrite a file. While a HDD can simply write the new data to the same sector, a SSD will allocate a new (or previously used) page for the overwritten data. The page that contains the now invalid data will simply be marked as invalid and at some point it’ll get erased. So, what would be the best way to securely erase files stored on a SSD? Overwriting with random data as we are used to from hard disks (e.g. using the "shred" utility) won't work unless you overwrite the WHOLE drive...

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• IBM laptop remove access-connections

  - by Kevin

  I installed IBM Access Connections on my IBM t61 laptop to manage my wireless connections but it simply will not connect to my network. I want to uninstall it and try the Intel software which is capable to performing the same task. However, when I go into "Control Panel" - "Add/Remove Programs" and try to "Remove" this package, it simply opens up a screen and closes it immediately. This happens too fast for me to see whether its an error. Has anyone encountered this issue ? The event logs do not show any error.

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• Determine/resolve filepath/alias of a certain command in the Windows command prompt

  - by porg

  How can I find out to which filepath (or alias) a certain command input will point to, in the Windows command prompt? Specifically Windows XP, info on other versions also appreciated! On Unix systems I simply use: $ which commandname /a/commandname Or: $ type -a commandname commandname is aliased to `/b/commandname' commandname is /a/commandname commandname is /b/commandname And I am simply looking for the equivalent in the Windows Shell (specifically Win XP). I came to this general question, from a specific issue: I had installed robocopy.exe (version 026), but the command line "robocopy" always triggers version 010, and I would like to determine where this command points to, in order to correct this mistake.

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