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  • Engineering techniques to diminish MVVM Driven Development time?

    - by Oscar Cabrero
    Hi Currently we just start releasing modules for a big project in MVVM but seems like the deliverables are starting to encounter a slowness with this model, such things as the learning curve effort and the fact that mvvm do requires a bit more code than other patterns, What Programming and software engineering techniques do you employ or thing could help us reduce the effort and speed up development? things like code generation with T4 templates, ligth MVVM frameworks, use Expression Blend, hire a designer to hanle UX. Thanks for any advice you could provide.

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  • Books on Debugging Techniques?

    - by zooropa
    Are there any books on debugging techniques? A friend of mine is learning to code and he asked me this question. I told him I don't know of any. Is it that you just have to go through the School of Hard Knocks to learn?

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  • Best techniques for estimation

    - by viswanathan
    What are the possible techniques to arrive at a good estimate? We use Delphi estimation technique for estimating tasks. What are the other better ways to do so? Also what would be the do's and dont's while giving an estimate.

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  • Best javascript i18n techniques / AJAX - dates, times, numbers, currency

    - by John Vasileff
    For server side generated content, i18n support is usually pretty easy, for example, Java provides extensive i18n support. But, these rich server side libraries are not available within the browser, which causes a problem when trying to format data client side (AJAX style.) What javascript libraries and techniques are recommended for performing client side formatting and time-zone calculations? Also - beyond simple client side formatting, how can consistency be achieved when performing both server side and client side formatting?

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  • Good resource for studying Database High Availability techniques

    - by Invincible
    Hello Can anybody suggest some good resource/book on Database high availability techniques? Moreover, High-availability of system software like Intrusion Prevention system or Web servers. I am considering high-availability is global term which covers clustring, cloud computing, replication, replica management, distributed synchronization for cluster. Thanks in advance!

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  • Common SIMD techniques

    - by zxcat
    Hi! Where can I find information about common SIMD tricks? I have an instruction set and know, how to write non-tricky SIMD code, but I know, SIMD now is much more powerful. It can hold complex conditional branchless code. For example (ARMv6), the following sequence of instructions sets each byte of Rd equal to the unsigned minimum of the corresponding bytes of Ra and Rb: USUB8 Rd, Ra, Rb SEL Rd, Rb, Ra Links to tutorials / uncommon SIMD techniques are good too :) ARMv6 is the most interesting for me, but x86(SSE,...)/Neon(in ARMv7)/others are good too. Thank you.

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  • Effective Android Programming Techniques

    - by kunjaan
    Please Help me compile a list of Effective Android Programming techniques Don't forget to free resources after use. Lot of resources like Cursors are overlooked. Free them too. Don't Use magic Numbers. values[0] is meaningless. The framework provides very useful accessors like values[SensorManager.DATA_X] "Make use of onPause()/onResume to save or close what does not need to be opened the whole time." protected void onResume() { mSensorManager.registerListener(...); } protected void onStop() { mSensorManager.unregisterListener(...); super.onStop(); } Make your Android UI Fast and Efficient from the Google I/O has a lot of useful UI Performance tips.

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  • What are some techniques to create scrollable areas?

    - by Omega
    I'm getting started with OpenGL ES on Android and I'd looking to learn some techniques to have a game map larger than the visible area. I'm assuming I've somehow got to ensure that the system isn't rendering the entire scene, including what's outside of the visible area. I'm just not sure how I'd go about designing this! This is for simple 2D top-down tile based rendering. No real 3D except what's inherent in OpenGL ES itself. Would anyone be able to get me started on the right path? Are there options that might scale nicely when I decide to start tilting my perspective and doing 3D?

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  • Techniques to avoid DeadlineExceededException in GAE/J?

    - by Tahir Akram
    I am developing an Twitter4J web application in Google App Engine/Java. I need to show two lists. One is Twitter friends and other is followers. With photo and screen name. It is working fine for people who have 20-30 followers and friends. But it gave me DeadlineExceededException when I try a user who has 150+ followers and friends. GAE throws this exception if web request take time more than 30 seconds. So what techniques I can adopt to avoid this exception. Should I generate two AJAX calls for each of my list. After page loads. So that every call will have its own 30 secs limit? Or what else you think? I am gone make it. Please help.

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  • Techniques for Visualizing Data

    - by Rob Wilkerson
    I'm looking into providing several methods of visualizing a large volume of data. This may include, but will not be limited to, simple graphing. The techniques I'm exploring will involve shapes, text and lines. It will also involve interaction with elements (hiding, focusing, etc.) and animation (shifting, dragging, systematic reorganizing, etc.) of those elements. SVG or Canvas seem like the obvious choices (in conjunction with a JS library--probably jQuery), but the lack of cross-browser availability is a concern. I'd prefer to avoid Flash/Flex, but right now it's the only rock solid, cross-browser technology I've found if support for IE7/8 is a requirement. Does anyone have any other suggestions or any additional information that would make a technology I've listed seem even more appealing? Thanks.

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  • Most useful techniques for two way data binding with js

    - by Perpetualcoder
    With abundance of web services and client side templating features of jQuery and likes, creating mashups or sites consuming a multitude of web services and posting data back to these services is becoming exceedingly popular. For a page of decent size with this kind of architecture, say a dashboard. What are the useful techniques of maintaining this client side state. In other words whats are some of the ways to do two way databinding? Sample scenario: Get Data From Service as JSON/XML Display/Bind on UI Capture User Input Recreate request from the UI controls/html Post Data To Service Get Response and Rebind

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  • Vertically center CSS techniques don't work in Chrome

    - by at.
    I've gone through stackoverflow questions and a whole bunch of articles on vertically centering text like the following: http://blog.themeforest.net/tutorials/vertical-centering-with-css/ None of the techniques seem to work with the latest version of Chrome. Is that just the nature of Chrome? My text just always appears at the top. It seems that whenever I use 50% or 100% as values for CSS's height or top, nothing happens. I just need a single line of text vertically centered. line-height isn't helpful because I want it centered in the middle of the browser window... I don't know how tall the browser window is going to be. UPDATE: The problem is apparently Foundation 4. Once I delete the following everything works as expected: <link href="/assets/foundation_and_overrides.css?body=1" media="screen" rel="stylesheet" /> Any idea on how to make it work with Foundation 4?

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  • Optimization Techniques in Python

    - by fear-matrix
    Recently i have developed a billing application for my company with Python/Django. For few months everything was fine but now i am observing that the performance is dropping because of more and more users using that applications. Now the problem is that the application is now very critical for the finance team. Now the finance team are after my life for sorting out the performance issue. I have no other option but to find a way to increase the performance of the billing application. So do you guys know any performance optimization techniques in python that will really help me with the scalability issue

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  • Database Optimization techniques for amateurs.

    - by Zombies
    Can we get a list of basic optimization techniques going (anything from modeling to querying, creating indexes, views to query optimization). It would be nice to have a list of these, one technique per answer. As a hobbyist I would find this to be very useful, thanks. And for the sake of not being too vague, let's say we are using a maintstream DB such as MySQL or Oracle, and that the DB will contain 500,000-1m or so records across ~10 tables, some with foreign key contraints, all using the most typical storage engines (eg: InnoDB for MySQL). And of course, the basics such as PKs are defined as well as FK contraints.

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  • Can you /should you learn SEO techniques

    - by Mark
    I know very little about Search engine optimization however from discussions with other I am now unsure where to start. Are there any books or do these date so quickly that they are obsolete? Do all website give you mis-information or are there any reliable sources? Is it just a case of trial and error and in turn experience? Is it event worth learning the techniques as search engines change their algorithms so regularly? I wonder if it just better to spend the time to ensure you have a regularly updated will written web site with quality content, site map, quality links etc..

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  • What are some programming techniques for converting SD images to HD images

    - by Dr Dork
    I'm taking programming class and instructor loves to work with images so most of our assignments involve manipulating raw RGB image data. One of our assignments is to implement a standard image converter that converts SD images to HD images and vice versa. I always take advantage of these types of assignments to go a little beyond what we were asked to do, so I added a basic anti-aliasing process that uses the average pixel color of the 3x3 surrounding pixels to improve the converted image. While it helps a bit, the resulting image still doesn't look good, which is ok because it's not expected to for the assignment. I've learned that converting an SD to HD images has shown to be much harder than down sampling to SD from HD just because SD to HD effectively involves increasing resolution when it is not there. Obviously, it is hard to create pixels from nothing, but I'd like enhance my anti-aliasing to something that provides better results when upscaling an image. Most of the techniques I find and read on the internet are far beyond my level of image processing and programming. Can anybody suggest any better methods or processes to create good HD content from SD content that may be within my programming skill level? I know that's a difficult thing to gauge since you don't know me, but perhaps knowing that I can write c++ code to read in raw RGB data and upscale/downscale it with simple average-anti-aliasing will give you an idea. Thanks in advance for all your help!

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  • Project Management and Scheduling Techniques

    - by Alec Smart
    Hello, I know this is probably the nth project management question. But am trying to move my team onto a more robust project management technique. Am wondering what is the best technique to use? I know that probably no technique is best, but which are the most popular techniques? Poker planning? Evidence Based Scheduling? COCOMO? Agile? Scrum? XP? Which one to use? Also, suppose I use EBS, wouldn't it be too time consuming to break down every single activity into fine grained tasks? E.g. "Design" is a goal, what kind of fine-grained tasks will I have under it? Is this is a waste of time i.e. dividing work into so many micro parts. Usually when I give my programmers a task, I follow up every week, and they complete quite a lot of the task assigned to them (the tasks are very broad e.g. X module). Is EBS worth it? Are there any white-papers on it so that I can implement it on my own? (instead of using Fogbugz) Most of my projects are web-based projects. Thank you for your time.

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  • Any techniques to interrupt, kill, or otherwise unwind (releasing synchronization locks) a single de

    - by gojomo
    I have a long-running process where, due to a bug, a trivial/expendable thread is deadlocked with a thread which I would like to continue, so that it can perform some final reporting that would be hard to reproduce in another way. Of course, fixing the bug for future runs is the proper ultimate resolution. Of course, any such forced interrupt/kill/stop of any thread is inherently unsafe and likely to cause other unpredictable inconsistencies. (I'm familiar with all the standard warnings and the reasons for them.) But still, since the only alternative is to kill the JVM process and go through a more lengthy procedure which would result in a less-complete final report, messy/deprecated/dangerous/risky/one-time techniques are exactly what I'd like to try. The JVM is Sun's 1.6.0_16 64-bit on Ubuntu, and the expendable thread is waiting-to-lock an object monitor. Can an OS signal directed to an exact thread create an InterruptedException in the expendable thread? Could attaching with gdb, and directly tampering with JVM data or calling JVM procedures allow a forced-release of the object monitor held by the expendable thread? Would a Thread.interrupt() from another thread generate a InterruptedException from the waiting-to-lock frame? (With some effort, I can inject an arbitrary beanshell script into the running system.) Can the deprecated Thread.stop() be sent via JMX or any other remote-injection method? Any ideas appreciated, the more 'dangerous', the better! And, if your suggestion has worked in personal experience in a similar situation, the best!

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  • deleting old unused images

    - by Ayyash
    As we move on with our content-based websites, lots of images get dumped in our images folder, but we rarely come across self-committed monkyes that delete their files once they do not need it, which means, we end up with a huge list of images in one folder, and it is very tricky to clean it up. My question is (and i dont know if this is the right website to ask it), is there a tool that allows me to find out if an image has been requested by web in the last (n) months? my other general question is, how do you do it? how do you take control of your images folders? what policy do you enforce on developers to clean up? what measures do you take in order to decide what goes and what stays if you end up with an out-of-control situation? my suggestion was to rename the images folder, create a new one, copy the basic ones and wait for someone to complain about a broken image! :) i find this to be the most efficient.

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  • how to get started with TopCoder to update/develop algorithm skills ?

    - by KaluSingh Gabbar
    at workplace, the work I do is hardly near to challenging and doing that I think I might be loosing the skills to look at a completely new problem and think about different ideas to solve it. A friend suggested TopCoder.com to me, but looking at the overwhelming number of problems I can not decide how to get started? what I want is to sharpen my techniques ( not particular language or framework ).

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  • Tips / techniques for high-performance C# server sockets

    - by McKenzieG1
    I have a .NET 2.0 server that seems to be running into scaling problems, probably due to poor design of the socket-handling code, and I am looking for guidance on how I might redesign it to improve performance. Usage scenario: 50 - 150 clients, high rate (up to 100s / second) of small messages (10s of bytes each) to / from each client. Client connections are long-lived - typically hours. (The server is part of a trading system. The client messages are aggregated into groups to send to an exchange over a smaller number of 'outbound' socket connections, and acknowledgment messages are sent back to the clients as each group is processed by the exchange.) OS is Windows Server 2003, hardware is 2 x 4-core X5355. Current client socket design: A TcpListener spawns a thread to read each client socket as clients connect. The threads block on Socket.Receive, parsing incoming messages and inserting them into a set of queues for processing by the core server logic. Acknowledgment messages are sent back out over the client sockets using async Socket.BeginSend calls from the threads that talk to the exchange side. Observed problems: As the client count has grown (now 60-70), we have started to see intermittent delays of up to 100s of milliseconds while sending and receiving data to/from the clients. (We log timestamps for each acknowledgment message, and we can see occasional long gaps in the timestamp sequence for bunches of acks from the same group that normally go out in a few ms total.) Overall system CPU usage is low (< 10%), there is plenty of free RAM, and the core logic and the outbound (exchange-facing) side are performing fine, so the problem seems to be isolated to the client-facing socket code. There is ample network bandwidth between the server and clients (gigabit LAN), and we have ruled out network or hardware-layer problems. Any suggestions or pointers to useful resources would be greatly appreciated. If anyone has any diagnostic or debugging tips for figuring out exactly what is going wrong, those would be great as well. Note: I have the MSDN Magazine article Winsock: Get Closer to the Wire with High-Performance Sockets in .NET, and I have glanced at the Kodart "XF.Server" component - it looks sketchy at best.

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  • Integer ID obfuscation techniques

    - by Chris
    Hi there, I'm looking for an easy and reversible method of obfuscating integer IDs. Ideally, I'd want the resulting obfuscation to be at most eight characters in length and non-sequential, meaning that the obfuscation of "1" should look nothing like the obfuscation for "2" and so on. This isn't meant to be secure by any means, so this isn't a huge concern. Additionally, the integers I'll be obfuscating aren't large - between one and 10,000 - but I don't want any collisions, either. Does anybody have any ideas for something that would fit this criteria? Thanks! Chris

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