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  • Syncing objects to a remote server, and caching on local storage

    - by Harry
    What's the best method of sycing objects (as JSON) to a remote server, with local caching? I have some objects that will pretty much just be plain-text with some extra meta-data. I was thinking of perhaps including a "last modified date" for both Local storage and Remote storage. This could then be used to determine which object is the most recent. For example, even though objects will be saved to both local and remote when they are saved, sometimes the user may not have internet access, or the server may be down, or any other number of things. In this case, the last modified date for remote storage would be reverted to its previous date. Local storage would remain as it is. At this point, the user could exit the application, and when they reload the application would then look at the last modified dates of the local and remote storages, and decide. Is there anything I'm missing with this? Is there a better method that I could use?

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  • How often should saving to disk occur in an automatically saving text editor?

    - by lelandmiller
    I am developing a simple text editor and would like the application to save the text automatically. In other words, the user would never have to press a save button. I have seen other applications that do this, and was wondering how often is it safe to write files to disk? From a user experience standpoint, it seems that the more frequently this happens the better, but I am worried about performance and possible disk wear (especially on writes to SSDs). It seems like the operating system disk caching might help avoid these problems, but I also don't know if its safe to rely on that for an application like this. I was planning on writing the whole document to disk at each save, but this just seems terribly inefficient if the OS ends up writing it to disk to frequently, but relying on program unload may lose data in the case of a crash. Does anyone have any experience dealing with this that might be able to help?

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  • Compare a variable that can have numeric or string as value

    - by Tarun
    I have a variable named Seconds_Behind_Master from one of my scripts. The problem is that this variable can either have a numeric value or can also take a string NULL as its value. Now, when I try to execute this script in shell it gets executed but gives a warning like this: [: Illegal number: NULL I believe it is due to the fact that in this case the value is NULL but when it compares it with numeral value 60 it gives this warning. How can I rectify it? Here is the piece of code: Seconds_Behind_Master=$Show_Slave_Status | grep "Seconds_Behind_Master" | awk -F": " {' print $2 '} if [ "$Seconds_Behind_Master" -ge "60" ]; then echo "replication delayed greater than or equal to 60." else if [ "$Seconds_Behind_Master" = "NULL" ]; then echo "Delay is Null." fi fi

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  • Windows 8/Surface Lunch Event Summary

    - by Tim Murphy
    Today was a big day for Microsoft with two separate launch event.  The first for Windows 8 and all of it’s hardware partners.  The second was specifically to introduce the Microsoft Windows 8 Surface tablet.  Below are some of the take-aways I got from the webcasts. Windows 8 Launch The three general area that Microsoft focused on were the release of the OS itself, the public unveiling of the Windows Store and the new devices available from its hardware partners. The release of the OS focused on the fact that it will be available at mid-night tonight for both new PCs and for upgrades.  I can’t say that this interested me that much since it was already known to most people.  I think what they did show well was how easy the OS really is to use. The Windows Store is also not a new feature to those of us who have been running the pre-release versions of Windows 8 or have owned Windows Phone 7 for the past 2 years.  What was interesting is that the Windows Store launches with more apps available than any other platforms store at their respective launch.  I think this says a lot about how Microsoft focuses on the ability of developers to create software and make it available.  The of course were sure to emphasize that the Windows Store has better monetary terms for developers than its competitors. The also showed off the fact that XBox Music streaming is available for to all Windows 8 user for free.  Couple this with the Bing suite of apps that give you news, weather, sports and finance right out of the box and I think most people will find the environment a joy to use. I think the hardware demo, while quick and furious, really show where Windows shine: CHOICE!  They made a statement that over 1000 devices have been certified for Windows 8.  They showed tablets, laptops, desktops, all-in-ones and convertibles.  Since these devices have industry standard connectors they give a much wider variety of accessories and devices that you can use with them. Steve Balmer then came on stage and tried to see how many times he could use the “magical”.  He focused on how the Windows 8 OS is designed to integrate with SkyDrive, Skype and Outlook.com.  He also enforced that they think Windows 8 is the best choice for the Enterprise when it comes to protecting data and integrating across devices including Windows Phone 8. With that we were left to wait for the second event of the day. Surface Launch The second event of the day started with kids with magnets.  Ok, they were adults, but who doesn’t like playing with magnets.  Steven Sinofsky detached and reattached the Surface keyboard repeatedly, clearly enjoying himself.  It turns out that there are 4 magnets in the cover, 2 for alignment and 2 as connectors. They then went to giving us the details on the display.  The 10.6” display is optically bonded to the case and is optimized to reduce glare.  I think this came through very well in the demonstrations. The properties of the case were also a great selling point.  The VaporMg allowed them to drop the device on stage, on purpose, and continue working.  Of course they had to bring out the skate boards made from Surface devices. “It just has to feel right” was the reason they gave for many of their design decisions from the weight and size of the device to the way the kickstand and camera work together.  While this gave you the feeling that the whole process was trial and error you could tell that a lot of science went into the specs.  This included making sure that the magnets were strong enough to hold the cover on and still have a 3 year old remove the cover without effort. I am glad that they also decided the a USB port would be part of the spec since it give so many options.  They made the point that this allows Surface to leverage over 420 million existing devices.  That works for me. The last feature that I really thought was important was the microSD port.  Begin stuck with the onboard memory has been an aggravation of mine with many of the devices in the market today. I think they did job of really getting the audience to understand why you want this platform and this particular device.  Using personal examples like creating a video of a birthday party and being in it or the fact that the device was being used to live blog the event and control the lights and presentation.  They showed very well that it was not only fun but very capable of getting real work done.  Handing out tablets to the crowd didn’t hurt either.  In the end I really wanted a Surface even though I really have no need for one on a daily basis.  Great job Microsoft! del.icio.us Tags: Windows 8,Win8,Windows 8 Luanch

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  • DirectCompute information

    - by N0xus
    I've been trying to make use of the GPU as part of a project of mine. I've looked into both CUDA and OpenCL, but the lack of information showing you how to introduce these into a project is shocking. Even their dedicated forum groups are dead. So now, I'm looking into DirectCompute. From what I can tell, it's simply a new type of shader file that makes use of HLSL. My question is this, does my program (aside from being DirectX 10 / 11 ) need its structure changed? I mean, is it simply a case of creating the CS file, setting in the project like I would any other shader, and watch the magic happen? Any information on this would be appreciated.

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  • How do I save to an NTFS partition?

    - by RADHAKRISHNAN
    I was using ubuntu 11.04 on my Laptop. While installing it from a DVD, I have created a 10 GB NTFS partition at the beginning of the hard disk, as primary. All other partitions ( swap, a ext3, a ext4 and a FAT32 ) are created in as logical in the extended partition. All were working well in ubuntun11.04. Now the system was upgraded to ubuntu 11.10 via internet and was sucessful. But unable to either create folder/files or to write to existing files in the said NTFS partiton. But files in the partition can read - means mounting done. Same is the case even if logged in as root also. Fortunately no such problem with other partitions including FAT Why it is so, please help.

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  • How do I set a wine program (ex. Foxit Reader for Windows) as the default program?

    - by To Do
    I regularly annotate pdf files and unfortunately there is no good linux pdf reader that supports decent annotations. Evince has a very rudimentary and buggy annotation feature. So I'm stuck using a Windows viewer through wine. This works pretty well but, when I simply right-click a file (in this case a pdf), properties, open with and selected Foxit Reader, the Unity Launcher icon remained the wine icon instead of the application icon. Has anyone set a wine program as the default program for any file? Any ideas?

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  • Is there a language offering LISP-like macros with a more complex syntax?

    - by blubb
    LISP's macros are extremely powerful constructs, and the inability to introspect and modify the program itself beyond the method signature level has always struck me as a limitation. Yet I favour "complex" syntax because it tends to be closer to natural language. So far I have failed to find a language which combines a powerful macro mechanism such as LISP's with a naturally looking syntax (1). Is anyone aware of such a language? Footnote: I would consider python to have a naturally looking syntax as it allows constructs like this: if 0 < a < 5 and b in list. The avoidance of braces to structure blocks is irrelevant in this case, though.

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  • ArchBeat Link-o-Rama for November 7, 2012

    - by Bob Rhubart
    Updated Business Activity Monitoring (BAM) Class | @OracleSOA Oracle SOA Team blogger Gary Barg has news for those interested in a skills upgrade. This updated Oracle University course "explains how to use Oracle BAM to monitor enterprise business activities across an enterprise in real time. You can measure your key performance indicators (KPIs), determine whether you are meeting service-level agreements (SLAs), and take corrective action in real time." Oracle Solaris 11.1 update focuses on database integration, cloud | @markfontecchio TechTarget editor Mark Fontecchio reports on the recent Oracle Solaris 11.1 release, with comments from IDC's Al Gillen. Thought for the Day "Why is composing symphonies tough? I don't know. It's just very few people in the world can do it well. And I think that's the case with upfront design. It is very hard to do well." — Martin Fowler Source: SoftwareQuotes.com

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  • schema.org specification for generic pages or posts on a CMS

    - by NateWr
    I'm trying to determine the best possible schema.org type to declare for the content section in the template of a content management system, which will handle regular news posts for small, local hospitality businesses. The type should represent the content of that page, which is likely to be a wide range of things. The description for Article pretty strongly encourages its use to be limited to the articles of a publication. For purely semantic reasons, I'm not sure if Blog is appropriate in this case -- businesses won't be creating typical "blog" content but are more likely to be writing about upcoming events, special deals, awards, etc. Would Webpage be appropriate in this instance? Although I'm a fan of the schema.org concept, I frequently find myself unsure how broadly or narrowly I'm meant to infer the meaning of a type. In such cases, is it safe to use a high-level element, such as CreativeWork, or does this blunt the usefulness of the markup?

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  • Arranging the colors on the board in the most pleasing form

    - by Shashwat
    Given a rectangular board of height H and width W. N colors are given. ith color occupy Pi percentage of area on the board. Sum of Pis is 1. What can be algorithm to layout the colors on the board in the form of rectangles in the most pleasing form. By pleasing mean the aspect ratios (Width/Height) of rectangle of each color should be as close to 1 as possible. In an ideal case the board would be filled only with squares.

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  • Is there a quick way to convert camera raw files to DNG?

    - by dericke
    Before I switched from Windows to Ubuntu for my daily computing, I used Adobe's Photoshop Lightroom for processing photos from my DSLR. Adobe made it really straightforward to convert from proprietary camera raw files (in my case, .NEF) to DNG. I haven't found any way to convert NEF to DNG in Ubuntu yet. Most photography programs do process NEFs to JPG/TIFF/PNG/etc., but I'm looking for a converter for archival purposes. Are there any tools available, either standalone or built into another app, that can losslessly convert from NEF to DNG?

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  • How to make game menu Java

    - by Deathsbreed
    I've been searching all over for how to make a game menu, but I haven't found anything useful. I have a very simple Pong like game (source-code here), and I want to add a main menu to it. This wouldn't be too much of a problem if I was making a standalone with JFrame instead of an Applet, but I want this to be available on the web (not downloaded). I might have been able to do some of it myself, except for the fact that it would mean having a very heavy main class (in this case the GNP.java file). So I was thinking, is there a way to basically have a Java Applet and have it use a JFrame and how? and if not, what could I do? Thanks!

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  • Is it practically useful to decline GUI for a newbie in Ubuntu?

    - by Kifsif
    My Ubuntu is 12.04. I have just started learning Linux and Ubuntu in particular. To remember commands quicker, I'd like to decline GUI. But there are some problems. I don't know where installed programs are to launch them. For example, I have a pdf file. I know that there is a program to view such files. Should it be the case of GUI, I would just click on the pdf-file, and have a look that I use Document Viewer 3.4.0. Then I would like to launch Firefox Web Browser. Even if I know it is installed, how to find the file to be launched using just CLI is a mystery to me. Could you suggest me anything.

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  • Adding a 'network' USB printer

    - by AndrewK
    I have a HP Deskjet 1050a printer, hence the 'network' in the title. Its a bog standard USB home printer. I have it attached to my router (has a USB port in it). I have got it connected and working to with Win8 PC and also a MacBook Air. Can't seem to get it to add as a printer to my Xubuntu laptop(s). It doesn't get detected automatically (not an actual network printer) and i've tried multiple options to get it working. It seems to add it but when printing a test page its saying the printer isn't connected. Ping works fine so it can see it, just can't add it as a printer. With Win8 I had to create a port with the IP of the printer (192.168.1.253 in this case), is there an Ubuntu alternative to do this?

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  • Slow writing HDD speed, Ubuntu 12.04 64-bit, Thinkpad T520i

    - by pyc
    It seems that (but I'm not completely sure), that when I'm copying files from gigabit network to HDD, I can't use full potential of the network which in my case is about 60 MB/s, because HDD writing is so slow like lower than 10 MB/s, and also it's slowing down the whole system which becomes pretty much unresponsive, almost impossible to work with. Copying files to samba share residing at Ubuntu machine, connected to share from Windows 7, I'm completely sure my network equipment is OK, and there's no CPU intensive process on Ubuntu except smbd getting about 10-20% from time to time which I think is OK. Something here is burried deep I think, maybe even in kernel. Already tried to switch from AHCI to compatibility mode, and turning acpi on and off - nothing helped. So it's like HDD buffer is full and emptying slowly while machine is sluggish, load is about 3 to 4. Somebody experienced the similar problems? Some help on troubleshooting process and identifying the cause would be helpful too :) Thanks!

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  • What is the standard for naming variables and why?

    - by P.Brian.Mackey
    I'm going through some training on objective-c. The trainer suggests setting single character parameter names. The .NET developer in me is crying. Is this truly the convention? Why? For example, @interface Square : NSObject { int size; } -(void)setSize: (int)s; I've seen developers using underscores int _size to declar variables (I think people call the variable declared in @interface ivar for some unknown reason). Personally, I prefer to use descriptive names. E.G. @interface Square : NSObject { int Size; } -(void)setSize: (int)size; C, like C# is case sensitive. So why don't we use the same convention as .NET?

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  • Preparing For TechEd

    - by Tim Murphy
    This being my first time going to TechEd and I want to make sure that I get the most out of it.  The first goal is to make sure that I get to the sessions that cover as many topics as possible.  This is important for me as a Solution Architect consultant specializing in Microsoft technologies.  To this end I have spent some time going through the sessions on the myTechEd site. The other reason for the trip is to connect with the Microsoft development community.  This includes both members of my local Midwest community and the global communities that I have only had online connections with.  Sharing the experience and getting a chance to exchange ideas with new and old friends is a great part of any convention. In any case, the time is getting close and I am looking forward to the trip. del.icio.us Tags: TechEd 2012,TechEd,community

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  • Javascript slider with fade

    - by tarmes
    I've been scouring the web for a slider that offers a particular effect, but I can't find one. I'm hoping that someone here will be able to help out... Specifically, I need a slider that will slide left and right through a series of HTML DIVs. However, I also need the old slide to fade out as it slides. This is because I don't what to have a visible frame around the the slider, so I don't want the old slide to be cropped against an invisible edge. It's hard to explain in words, so here's a graphic. In each case the green slide is entering the view, the red one is existing. Is possible, I'd like the slide to use CSS3 transitions where available for the smoothest possible effect. Has only ever come across such a beast?

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  • Is it common in companies that non-techs are doing analyzes

    - by Kubi
    It's been 2 months since I started working at an international big consulting company. I like my colleagues personally but it's like a joke since my first day. Analysts (people who has no idea about the tech. background) are planning the workflow and functions. In my case, none of my friends here even wrote even a single line of html. When I say Html, I doubt if they know what I mean. But they are deciding about really key decisions in a web system implementation project. Is this always like this?

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  • reliably restarting services using upstart or runit

    - by murtaza52
    I want to reliably restart my app and web server processes on crash. If I understand correctly, runit starts every service as a child process. If the child process crashes this sends a signal to the parent process which in turn respawns the service as a child. How does this work in the case of upstart. Does it also spawn a child process like runit? I am considering using runit for this. Is that needed, or is upstart good enough for this ? I am using nginx for my web server and gunicorn (python) for my app server.

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  • Replace Android on HP Slate 21?

    - by user288626
    I want to replace Android with Ubuntu for Androids on my new HP Slate 21. As far as I known none has ever tried it yet and I would appreciate if Ask Ubuntu would help out here. Would I need to unlock & root first my machine? (In which case I will need a second machine plugged to my Slate...) Or can I just insert the bootable usb with the distribution I need and go from there as in a normal non-optical drive situation? Also where can I find the downloadable file/image of Ubuntu for Android as describe here? I see no link with the name on it.. Should I just download the normal dis and choose from options when installing it?

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  • What does backup procedures and troubleshooting guidelines mean for a system

    - by Podolski
    I am writing the documentation for a piece of software which I have made but I don't understand what it means in some aspects. It asks me to write about backup procedures but what exactly does this mean? Does this mean like backing up the database on another hosting service or something else entirely? I am dumbfounded by what troubleshooting guidelines are as well. If you have any idea what this could mean feel free to give your insight even if you aren't 100% sure in case it could spark what it means inside of me. Thanks.

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  • How to handle jumping up a slope in a runner game?

    - by you786
    In an 2D endless runner, what should happen when the player is running "too fast" up a slope and jumps? For example, in a "normal" case: .O. . __..O_____ . / . / O/ _/ If he is moving to the right slowly enough, he will jump upwards and land on the flat part of the surface. However, if he is moving too fast, the jump will have no effect as his forward motion will bring him back in contact with the slope before he can get high enough to pass over it. When the speed is sufficiently high, there will effectively be no jump. _________ / .O/ O/ _/ Are there any known ways to solve this issue? I know it's physically correct*, but are there techniques that other games use to overcome this in a reasonable manner? As a last resort I'll have to just remove all slopes that are too slanted. *If you constrain the player to never jumping backwards.

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  • deny-uncovered-http-methods in Servlet 3.1

    - by reza_rahman
    Servlet 3.1 is a relatively minor release included in Java EE 7. However, the Java EE foundational API still contains some very important changes. One such set of features are the security enhancements done in Servlet 3.1 such as the new deny-uncovered-http-methods option. Servlet 3.1 co-spec lead Shing Wai Chan outlines the use case for the feature and shows you how to use it in a recent code example driven post. You can also check out the official specification yourself or try things out with the newly released Java EE 7 SDK.

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