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  • Generic log analyzer that produces reports

    - by Eugene
    About 600 customers use our application. We have very detailed logs for everything that happens in the application, from changes in the data model, memory and CPU/GPU usage to clicks on the UI elements. We want to be able to parse the logs coming from these customers and analyze them to understand how users use our application and what happens internally in the application. Is there a log analyzer that can produce such reports automatically?

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  • Best practices for caching search queries

    - by David Esteves
    I am trying to improve performance of my ASP.net Web Api by adding a data cache but I am not sure how exactly to go about it as it seems to be more complex than most caching scenarios. An example is I have a table of Locations and an api to retrieve locations via search, for an autocomplete. /api/location/Londo and the query would be something like SELECT * FROM Locations WHERE Name like 'Londo%' These locations change very infrequently so I would like to cache them to prevent trips to the database for no real reason and improve the response time. Looking at caching options I am using the Windows Azure Appfabric system, the problem is it's just a key/value cache. Since I can only retrieve items based on keys I couldn't actually use it for this scenario as far as Im aware. Is what I am trying to do bad use of a caching system? Should I try looking into NoSql DB which could possibly run as a cache for something like this to improve performance? Should I just cache the entire table/collection in a single key with a specific data structure which could assist with the searching and then do the search upon retrieval of the data?

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  • Inspiring Computer Science College Student Stories?

    - by funk-shun
    After watching "The Social Network", a movie about Mark Zuckerberg and Facebook, I had a productivity spike as it inspired me to learn many different languages and software. That spike has been deteriorating somewhat and I don't feel like watching the movie all over again so I was wondering if anybody had any other similar success stories/links/articles/whatever. Mainly about successes that started for people in college.

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  • What is the *correct* term for a program that makes use of multiple hardware processor cores?

    - by Ryan Thompson
    I want to say that my program is capable of splitting some work across multiple CPU cores on a single system. What is the simple term for this? It's not multi-threaded, because that doesn't automatically imply that the threads run in parallel. It's not multi-process, because multiprocessing seems to be a property of a computer system, not a program. "capable of parallel operation" seems too wordy, and with all the confusion of terminology, I'm not even sure if it's accurate. So is there a simple term for this?

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  • Calculate time in all countries for fixed time in one of them [migrated]

    - by Muiz
    I have table with all countries GMT/UTC timezones, I need to see what time is in the rest of the countries when in USA is 11am-3pm Not on particular date just know the difference in time. I did my calculation like that I -5 GMT in USA and time is 11am then in Russia for example is +4 GMT. 5+4+11=20pm in Russia when USA is 11am, this works with countries that have + GMT zone but ones that have minus it shows wrong time. I am working in Excel please help me with advice on how to do it.

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  • How to price code reviews to encourage good behavior?

    - by Chris Clark
    I work for a company that has a hosted .net internet application with many clients. Those clients often want to write customizations for our application. We have APIs to hook into the app, but the customizations themselves are written in .net. This is a shared, secure hosting environment and we have to code review these customizations before we can deploy them in our datacenter to ensure that they don't degrade performance, crash our servers, or open any security vulnerabilities. We charge for these code reviews. The current pricing model is simply a function of the number of lines of code. I think this is a bad idea for a variety of reasons, but primarily because, if we are interested in verifying that the code works as expected, we should be incentivizing good, readable code, not compaction. I would like to propose a pricing model that incorporates some, or all of the following as inputs: Lines of code Cyclomatic complexity Avg function length # of functions Are there any other metrics I should incorporate, or other ideas for how we can reasonably create pricing for code reviews that encourages safe and understandable code?

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  • Caching strategies for entities and collections

    - by Rob West
    We currently have an application framework in which we automatically cache both entities and collections of entities at the business layer (using .NET cache). So the method GetWidget(int id) checks the cache using a key GetWidget_Id_{0} before hitting the database, and the method GetWidgetsByStatusId(int statusId) checks the cache using GetWidgets_Collections_ByStatusId_{0}. If the objects are not in the cache they are retrieved from the database and added to the cache. This approach is obviously quick for read scenarios, and as a blanket approach is quick for us to implement, but requires large numbers of cache keys to be purged when CRUD operations are carried out on entities. Obviously as additional methods are added this impacts performance and the benefits of caching diminish. I'm interested in alternative approaches to handling caching of collections. I know that NHibernate caches a list of the identifiers in the collection rather than the actual entities. Is this an approach other people have tried - what are the pros and cons? In particular I am looking for options that optimise performance and can be implemented automatically through boilerplate generated code (we have our own code generation tool). I know some people will say that caching needs to be done by hand each time to meet the needs of the specific situation but I am looking for something that will get us most of the way automatically.

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  • Is there an open source license for this?

    - by Philip
    I have written code at home, on my own time and using my own knowledge and equipment, while under no contract or NDA. I want to make this code open source so that I can use it in software I write for an employer, without denying myself the right to use it at home or elsewhere later. I'm not sure if saying it is in the "public domain" would fit this purpose, or if I need to find an open source license. I want anyone to be able to use the code in closed source proprietary software with zero requirements for including a license with the source or binary. And I want to minimize the risk of anyone being sued for using it. (I'm aware that one can never be 100% safe from being sued.) Is there an open source license that fits this purpose? To what extent is what I want to do even possible? I wouldn't mind putting the license in comments in the code files themselves, but that obviously doesn't go with the binary.

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  • When to write an explicit return statement in Groovy?

    - by Roland Schneider
    At the moment I am working on a Groovy/Grails project (which I'm quite new in) and I wonder whether it is good practice to omit the return keyword in Groovy methods. As far as I know you have to explicitly insert the keyword i.e. for guard clauses, so should one use it also everywhere else? In my opinion the additional return keyword increases readability. Or is it something you just have to get used to? What is your experience with that topic? Some examples: def foo(boolean bar) { // Not consistent if (bar) { return positiveBar() } negativeBar() } def foo2() { // Special Grails example def entitiy = new Entity(foo: 'Foo', bar: 'Bar') entity.save flush: true // Looks strange to me this way entity }

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  • Optimize strategies for xml parsing?

    - by Future2020
    I am looking for general optimization tips and guidelines for xml parsing. One of the optimization strategies is of course selecting the "right" parser. A detailed comparison between the available parsers for ios can be found here http://www.raywenderlich.com/553/how-to-chose-the-best-xml-parser-for-your-iphone-project. However, I am currently trying to investigate general guidelines and tips on how to optimize by payloads to increase the performance as possible. This question is similar to (a question I have posted in the context of ios) but I have not got a sufficient answer. So this question is not in the context of any particular programming language.

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  • Who determines what is best practice? [closed]

    - by dreza
    I've often searched for answers relating to "best practice" when writing code. And I see many questions regarding what is best practice. However, I was thinking the other day. Who actually determines what this best practice is? Is it the owners or creators of the programming language. Is it the general developer community that is writing in the language and it's just a gut feeling consensus. Is it whoever seems to have the highest prestige in the developer world and shouts the loudest? Is best practice really just another term for personal opinion? I hope this is a constructive question. If I could word it better to ensure it doesn't get closed please feel free to edit, or inform me otherwise.

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  • Is it just me or is this a baffling tech interview question

    - by Matthew Patrick Cashatt
    Background I was just asked in a tech interview to write an algorithm to traverse an "object" (notice the quotes) where A is equal to B and B is equal to C and A is equal to C. That's it. That is all the information I was given. I asked the interviewer what the goal was but apparently there wasn't one, just "traverse" the "object". I don't know about anyone else, but this seems like a silly question to me. I asked again, "am I searching for a value?". Nope. Just "traverse" it. Why would I ever want to endlessly loop through this "object"?? To melt my processor maybe?? The answer according to the interviewer was that I should have written a recursive function. OK, so why not simply ask me to write a recursive function? And who would write a recursive function that never ends? My question: Is this a valid question to the rest of you and, if so, can you provide a hint as to what I might be missing? Perhaps I am thinking too hard about solving real world problems. I have been successfully coding for a long time but this tech interview process makes me feel like I don't know anything. Final Answer: CLOWN TRAVERSAL!!! (See @Matt's answer below) Thanks! Matt

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  • Basic web architecture : Perl -> PHP

    - by Sunny Jim
    This is an architecture question. If there is a better forum, please redirect me. Apologies in advance. Essentially every website is built around a relational database, right? When a user uploads form data, that data is stored in a table. The problem is that the table structure(s) need to be modified whenever the website form is modified. Although I understand that modern web frameworks work around this problem by automatically building forms based on the table structure. For the last 20 years, I have been building websites using Perl. When I first encountered this problem, the easiest solution was to save serialized Perl objects as data BLOBS. After XML's introduction, this solution worked even better because XML is so effective for representing arbitrary data. This approach is consistent with the original Perl principles of Hubris, Laziness, and Impatience and I'm pretty committed to it. Obviously, the biggest drawback is that this solution locks me into the Perl interpreter. So instead, I've just completed a prototype of a universal RDB table. The prototype is written in Perl but porting it to PHP will be a good chance to develop those skills. The principal is based on the XML::Dumper module, which converts arbitrary Perl data structures into uniform XML. With my approach, each XML node is stored as a table record. I underestimated this undertaking and rolled something up myself. But the effort allows me to discuss the basic design instead of implementation details. As mentioned, I'm pretty committed to this approach of using flexible data structures. It's been successfully deployed on many websites, large, and complex. But are there any drawbacks I've overlooked? I rolled my own. Are other people taking a similar approach to their data? What kinds of solutions are available? I have not abandoned my dream of eventually contributing something useful to the worldwide community. In order to proceed, the next step would be peer review. How does one pursue that effort? Thanks! -Jim

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  • Adaptive Payment with Paypal in Iphone App

    - by user2436477
    I wanted to implement three way transection where there is only one payer but two different receivers. Both receivers will receive predefined percentage of payment. I implemented demo for single sender and single receiver,And it works fine.But i don't know how to implement for three way transection. So do i have to create library by myself ? OR Is there any library for adaptive payment feature?

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  • How is the RIP loaded when an interrupt arrives in an IA-32e 64-bit IDT Gate Descriptor?

    - by Vern
    I need some help with the programming of an IA-32e Interrupt Descriptor as I'm pretty new to it. I don't think I quite understand how the RIP is loaded when an Interrupt arrives. There is a Segment Selector in Intel's 64-bit IDT Gate Descriptor. However, from my understanding across the 5 part Intel manuals, the Linear Address of the Interrupt Handler is loaded into RIP from the 64-bit offset specified in the IDT Gate Descriptor. The only use of the segment selector is to check: if there is a change in privilege levels the Interrupt Handler is truly pointing to a code segment My questions are: Is RIP taken from the 64-bit offset only? Or is RIP = offset(sign extended to 64-bits) + segment selector base? Is the base address pointed to by the segment selector in the IDT Gate Descriptor ignored? Or does it have a use?

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  • What is the best policy for allowing clients to change email?

    - by Steve Konves
    We are developing a web application with a fairly standard registration process which requires a client/user to verify their email address before they are allowed to use the site. The site also allows users to change their email address after verification (with a re-type email field, as well). What are the pros and cons of having the user re-verify their email. Is this even needed? EDIT: Summary of answers and comments below: "Over-verification annoys people, so don't use it unless critical Use a "re-type email" field to prevent typos Beware of overwriting known good data with potentially good data Send email to old for notification; to new for verification Don't assume that the user still has access to the old email Identify impact of incorrect email if account is compromised

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  • How to get multiple open-source projects to use a standard way of doing something.

    - by Marco
    Problem In the last couple weeks, I've used 3 different "repository" tools (listed in alphabetical order): gradle ivy maven I'm calling them "repository" tools because I've also used sbt -- which fortunately uses ivy to manage it's cache or local repository. Each of these tools will create it's own repository. The defaults are: ~/.m2/repository for maven ~/.gradle/cache ~/.ivy2/cache Why can't they all use the same cache? Goal I'd like to change the world so that all three build tools could use the same cache. I'm looking for advice about issues I'm likely to run into and smart ways to get around them. By "use the same cache", I do not mean "retrieve from another build tool's cache". I mean "retrieve from and store in another build tool's cache". While I could go ahead and submit issues to the three projects, I know from experience (as a developer on an open source project), that if you want something done, you're best off getting it done yourself. Also, it seems like I need to get all 3 communities on board to some degree. What is the recommended approach for getting this kind of thing done? How do I approach the different communities? Do I work on patches for the 3 different projects, or would it be better off to create my own "interface" project that deals with these issues and have the 3 tools interface with that? Is this a standards question that I need to address on that front? Lastly, if I'm missing something and this is possible (in an globally configurable fashion), then please let me know.

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  • Windows driver signing

    - by Artem Smolny
    My company is developing driver for our hardware. Now I need to sign my driver for 32 and 64 bit platforms. Please tell, now I need to buy Authenticode certificate, right? What CA to use? DigiCert? GlobalSign? ( http://www.sslshopper.com/microsoft-authenticode-certificates.html ) Symantec? ( http://www.symantec.com/verisign/code-signing/microsoft-authenticode ) What is the difference between this CA offers? I need to use tools from WDK?

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  • Who are the outspoken critics of Object-Oriented design?

    - by Xepoch
    Sure, object-oriented techniques are great and have stuck around for a while. I know only less than a handful of critics of the OO principles. It seems as though most non-OO designs and architectures are shunned, yet we continue to write a lot of good software in C and solve a lot of data changes via awk/sed and countless other examples. Correct tool for the correct job, yes? I'm having a hard time finding articles, presentations, or published criticisms of OO (even Fred Brooks has blessed information hiding). Are there any well-known, published and/or outspoken critics of OO?

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  • How to get paid and figure out if I want to keep this client [migrated]

    - by Heiner Fawkes
    I have a client who is not paying on time, but it looks like the specifics don't match similar questions on this SE site. I got a call from a client I did website work for years ago. I had not done this kind of work for many years and frankly I'm not sure I want to now, but nevertheless about a month ago I agreed to bring his website, SEO, social media, and overall marketing for his small business up to speed. Why? He has told me many times how I'm the most honest, most well-informed contractor he's had experience with. And I personally kind of like him too. So I started working on an hourly basis. I sent one very small invoice and got paid. Then we talked a whole lot about all sorts of feature he would like me to implement. I started that work, and sent a second invoice on the first of the month (one of my two stated billing days). I didn't get paid. On every invoice it states that I charge a whopping ten percent per week late. I sent many voicemails and emails asking to please let me know what's going on with payment, and didn't get replies. Then the 15th of the month rolled around (which I stated initially as one of my invoicing dates). Since I hadn't been paid for the last invoice, I simply didn't send him an invoice at that time but emailed him and said that I will combine it with the next scheduled invoice for this reason (probably a bad idea I realize). Eventually he sent a portion of the invoice payment. I emailed back to let him know that he's three weeks late and what the remaining balance is. Finally we got in touch via phone. He basically told me that he thought I hadn't done all of the work I said I did. He looked at the page source code and it didn't look complete to him. I explained why his perception would be different and what work I had done as specified. He accepted this and said that part of the reason he didn't pay in full is that he's been swamped with personal family stuff, and part of the reason is that he didn't think I did all the work. That struck me as pretty weird. He also expressed concern that he has no idea now how much all the changes he has asked for are going to cost. And once again, he told me how honest and high-quality my services are compared to others he has dealt with. He also said he would pay me more (but not all) of the now three weeks overdue invoice that day. I didn't receive any payment. Basically this is how the client relationship strikes me: He's not good at communication. He's very busy and English isn't his first language. He almost never replies to emails but phone calls are fine. He's asked me to avoid emails for communication and I've asked him to please use email. He might not have enough money to afford all the things he has asked for. But so far I have been working for an hourly fee (which is quite high). He also has started paying monthly for hosting and social media services from me. What seems very abnormal is for a client to be so overdue on payments and to actually withhold payment of an invoice without any communication because he didn't think the work was done. I told him that I will send dollar estimates of each module of remaining work so that we can decide which ones are the highest priority if he cannot afford them all. I also reiterated that in the future if he has doubts about the work or an inability to pay, he must contact me immediately to say so. I basically plan to state the following to him: I would like to work for him and help his business. I also have sympathy for his recent family difficulties. I am happy to figure out payment plans that would work better for him, but first I need to be paid in full for all outstanding invoices, especially given that I skipped one of them just to be nice. The most crucial thing I need is communication about any problems with my work or his ability to pay. Once again, he heeds to pay in full immediately before we negotiate anything else. Does the above seem like an appropriate communication? Is anything missing from it? Is anything I'm doing here really abnormal?

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  • Building a database class in PHP

    - by Sprottenwels
    I wonder if I should write a database class for my application, and if so, how to accomplish it? Over there on SO, a guy mentioned it should be written as an abstract class. However, I can't understand why this would be a benefit. Do I understand correctly, that if I would write an abstract class, every other class that methods will need a database connection, could simply extend this abstract class and have it's own database object? If so, how is this different from a "normal" class where I could instantiate an database object? Another method would be to completely forget about my own class and to instantiate a mysqli object on demand. What do you recommend?

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  • Creating a remote management interface

    - by Johnny Mopp
    I'm looking for info on creating a remote management interface for our software. This is not anything illicit. Our software is for live TV production and once they go on-air we can't access the PC (usually through LogMeIn). I would like to be able to upload/download files and issue commands to our software. The commands would be software specific like "load this file" or "run this script" or "return this value" etc. A socket connection is preferred but the problem is most of our PCs are behind firewalls and NAT servers. I'm not sure where to start. I think HTTP tunneling is the way to go but am wondering if there are other options or recommendations. Also, assume our clients are not willing to open up ports for security reasons. Thanks.

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  • Should maven generate jaxb java code or just use java code from source control?

    - by Peter Turner
    We're trying to plan how to mash together a build server for our shiny new java backend. We use a lot of jaxb XSD code generation and I was getting into a heated argument with whoever cared that the build server should delete jaxb created structures that were checked in generate the code from XSD's use code generated from those XSD's Everyone else thought that it made more sense to just use the code they checked in (we check in the code generated from the XSD because Eclipse pretty much forces you to do this as far as I can tell). My only stale argument is in my reading of the Joel test is that making the build in one step means generating from the source code and the source code is not the java source, but the XSD's because if you're messing around with the generated code you're gonna get pinched eventually. So, given that we all agree (you may not agree) we should probably be checking in our generate java files, should we use them to generate our code or should we generate it using the XSD's?

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  • Security of logging people in automatically from another app?

    - by Simon
    I have 2 apps. They both have accounts, and each account has users. These apps are going to share the same users and accounts and they will always be in sync. I want to be able to login automatically from one app to the other. So my solution is to generate a login_key, for example: 2sa7439e-a570-ac21-a2ao-z1qia9ca6g25 once a day. And provide a automated login link to the other app... for example if the user clicks on: https://account_name.securityhole.io/login/2sa7439e-a570-ac21-a2ao-z1qia9ca6g25/user/123 They are logged in automatically, session created. So here we have 3 things that a intruder has to get right in order to gain access; account name, login key, and the user id. Bad idea? Or should I can down the path of making one app an oauth provider? Or is there a better way?

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  • ASP.NET web-application example for newbies

    - by A-Cube
    I want to learn ASP.NET web-application development by example. I want to learn it from an already developed web-application that is good as a tutorial for newbies. A fully functional web application that is small but powerful enough to teach newbies the development effort required for web-application development. I am looking for some application that is made using software engineering principles and not just a code written haphazardly.

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