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• NO-SQL reliable for small bussines app?

  - by mamcx

  I'm deciding between go for a NON-SQL engine or a regular SQL one for a document managment system for small bussines. I have experience with firebird/sql server and found a good track of reliability (specially with firebird). This market is full of crappy "servers" (clon-made PC, the mayority), cheap harddisk, rarely use of RAID or anything like that, some are in locations where a power-off is normal, some not have a UPS, etc... (I will include off-site auto-backup to external servers, but that no change the internal setup). (I know about end-user education about such proper setups, but is stupid depend on that, so stick to te point) From the desing point of view, a schema-less database is the way to go for my system, but, I worry if any of the actual solutions (MongoDb, Tokyo Cabinet, etc) are like firebird and survice crash, malfunctions & abuse so data corruption is very rare. The plan is store the office documents there & provide a central repository.

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• Getting the battery current values for the Android Phone

  - by themangoman

  I am trying to collect power usage statistics for the Android G1 Phone. I am interested in knowing the values of Voltage and Current, and then able to collect statistics as reported in this PDF. I am able to get the value of Battery voltage through registering for an intent receiver to receive the Broadcast for ACTION_BATTERY_CHANGED. But the problem is that Android does not expose the value of current through this SDK interface. One way I tried is via sysfs interface, where I can view the battery current value from adb shell, using the following command $cat /sys/class/power_supply/battery/batt_current 449 But that too works only if the phone is connected via USB interface. If I disconnect the phone, I see the value of batt_current as '0'. I am not sure why the value of current reported is zero. It should be more than zero, right? Any suggestion / pointers for getting battery current value? Also please correct me if I am wrong.

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• Size of int in C on different architectures

  - by NawaMan

  I am aware that the specification of the C language does not dictate the exact size of each integer type (e.g., int). What I am wondering is: Is there a way in C (not C++) to define an integer type with a specific size that ensures it will be the same across different architectures? Like: typedef int8 <an integer with 8 bits> typedef int16 <an integer with 16 bits> Or any other way that will allow other parts of the program to be compiled on different architecture.

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• Which is faster in Python: x**.5 or math.sqrt(x)?

  - by Casey

  I've been wondering this for some time. As the title say, which is faster, the actual function or simply raising to the half power? UPDATE This is not a matter of premature optimization. This is simply a question of how the underlying code actually works. What is the theory of how Python code works? I sent Guido van Rossum an email cause I really wanted to know the differences in these methods. My email: There are at least 3 ways to do a square root in Python: math.sqrt, the '**' operator and pow(x,.5). I'm just curious as to the differences in the implementation of each of these. When it comes to efficiency which is better? His response: pow and ** are equivalent; math.sqrt doesn't work for complex numbers, and links to the C sqrt() function. As to which one is faster, I have no idea...

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• TypeInitializationException When Getting an NHibernate Session

  - by Paul Johnson

  I’ve run into what appears to be an NHibernate config problem. Basically, I ran up a simple proof of concept persistence integration test using NUnit, the test simply querys an Oracle database and successfully returns the last record received by the underlying table. However, when the assemblies are taken out of the NUnit test environment and deployed as they would be for an actual application build, my call for an NHibernate session results in a ‘TypeInitializationException’ whilst executing the code line: sessionFactory = New Configuration().Configure().BuildSessionFactory() The application is a vb.net console app running against an Oracle 9.2 database, using a ‘coding framework’ published on the web by Bill McCafferty entitled 'NHibernate Best Practices with ASP.NET' (pre S#harp Architecture). I am running version 2.1.2.4000 of NHibernate. Any assistance much appreciated. Kind Regards Paul J.

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• Adding scope variable to an constructor

  - by Lupus

  I'm trying to create a class like architecture on javascript but stuck on a point. Here is the code: var make = function(args) { var priv = args.priv, cons = args.cons, pub = args.pub; return function(consParams) { var priv = priv, cons = args.cons; cons.prototype.constructor = cons; cons.prototype = $.extend({}, pub); if (!$.isFunction(cons)) { throw new Hata(100001); } return new cons(consParams); } }; I'm trying to add the priv variable on the returned function objects's scope and object scope of the cons.prototype but I could not make it; Here is the usage of the make object: var myClass = make({ cons: function() { alert(this.acik); }, pub: { acik: 'acik' }, priv: { gizli: 'gizli' } }) myObj = myClass(); PS: Please forgive my english...

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• Need advice to design 'crack-proof' software

  - by alee

  I am currently working on a project where i need to create some architecture, framework or any standards by which i can "at least" increase the cracking method for a software, i.e, to add to software security. There are already different ways to activate a software which includes online activation, keys etc. I am currently studying few research papers as well. But there are still lot of things that i want to discuss. Could someone guide me to some decent forum, mailing list or something like that? or any other help would be appreciated.

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• Reinforcement learning with neural networks

  - by Betamoo

  I am working on a project with RL & NN I need to determine the action vector structure which will be fed to a neural network.. I have 3 different actions (A & B & Nothing) each with different powers (e.g A100 A50 B100 B50) I wonder what is the best way to feed these actions to a NN in order to yield best results? 1- feed A/B to input 1, while action power 100/50/Nothing to input 2 2- feed A100/A50/Nothing to input 1, while B100/B50/Nothing to input 2 3- feed A100/A50 to input 1, while B100/B50 to input 2, while Nothing flag to input 3 4- Also to feed 100 & 50 or normalize them to 2 & 1 ? I need reasons why to choose one method Any suggestions are recommended Thanks

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• Get jQuery post redirect response

  - by Wickethewok

  I've written some HTML/Javascript that sits on a third-party server for security reasons. This page performs a javascript post to another page on the same site. However, instead of responding with useful data, it instead wants to perform a redirect (if you would post via a normal HTML form to this page, it would redirect your browser). How can I process this process? I basically want to be able to extract the url's query parameters that it is trying to redirect with (and then put this link into a hidden form field). Here is my basic ajax post... $.ajax({ url: '/someurl/idontcontrol', data: serialized_form_data, async: false, type: 'POST', success: function(data, textStatus) { $('#redirect_link').val(WHAT_DO_I_PUT_HERE); } }); Note that the URL I am posting to is not one that I control, so I have no power over what it returns. Thanks!

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• What HTML is permitted within Flash text fields.

  - by JasonS

  Hi, Could someone clarify for me what input Flash accepts for its text fields? I am tasked with managing a content management system, this then generates XML which power's flash sites. I have nothing to do with Flash. I work with PHP. Currently we use a rather temperamental Flash Text Editor which is prone to all sorts of troubles. I tried to plug-in tinyMce but it broke the Flash templates. I then recently spoke to someone who said that flash should take any HTML. Now I am confused as this would point to a dodgy template. Can someone clarify. Do Flash text fields handle all HTML or just a limited subset of HTML. If it is the latter, what happens if it comes across a tag it doesn't recognise? Does it display the tag or break? Thanks, Jason

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• git status: how to ignore some changes

  - by Mr Fooz

  Is there a way to have git status ignore certain changes within a file? Background I have some files in my repository that are auto-generated (yes, I know that's typically not recommended, but I have no power to change this). Whenever I build my tree, these auto-generated files have status information updated in them (who generated them, a timestamp, etc.). When I say git status, I'd like it to run a filter on these generated files that strips out this transient status information. I only want it to show up in the "Changed but not updated:" section of git's output if there are other, real changes. Using the .gitattributes approach found at http://progit.org/book/ch7-2.html, I am able to get git diff to ignore these status line changes using a simple egrep filter. I'd like to get git status to also use textconv filters (or something equivalent). I'd prefer it if merges aren't affected by any of this filtering.

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• How do I design the file storage issue?

  - by user102533

  I am working on an application that creates video files and stores them in a folder in the C:\ drive. I speculate that there will be a large number of these files in the future and we would run out of disk space at some point of time (on our VPS). When the time comes that we have to upgrade, we either plan to use one of the Cloud providers to store files or our existing provider can add another disk (say D:\ drive). Either way, I would want to design the app now in a way that in future, moving to different locations would not be an issue and would be transparent to the end user. The code that creates these files supports 2 ways: myObj.SetOutputToDisk(<path to store>); or myObj.SetOutputToMemoryStream(ms); If we go with the Cloud architecture, I assume we might have the following combination: Cloud Files + Existing VPS or Cloud Files + Cloud Windows Server Given the unknowns at this time, how would I go about designing this?

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• What is the underlying reason for not being able to put arrays of pointers in unsafe structs in C#?

  - by cons

  If one could put an array of pointers to child structs inside unsafe structs in C# like one could in C, constructing complex data structures without the overhead of having one object per node would be a lot easier and less of a time sink, as well as syntactically cleaner and much more readable. Is there a deep architectural reason why fixed arrays inside unsafe structs are only allowed to be composed of "value types" and not pointers? I assume only having explicitly named pointers inside structs must be a deliberate decision to weaken the language, but I can't find any documentation about why this is so, or the reasoning for not allowing pointer arrays inside structs, since I would assume the garbage collector shouldn't care what is going on in structs marked as unsafe. Digital Mars' D handles structs and pointers elegantly in comparison, and I'm missing not being able to rapidly develop succinct data structures; by making references abstract in C# a lot of power seems to have been removed from the language, even though pointers are still there at least in a marketing sense. Maybe I'm wrong to expect languages to become more powerful at representing complex data structures efficiently over time.

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• ASP.Net ITemplate - ways of declaring

  - by Mahes

  when we want to define a Template in our user controls we declare a field like this in our user controls public ITemplate MyTemplate { get; set; } so that the user defined templates contents will be represented in MyTemplate, and you can use it. and there are ways to customize the templates, for example [TemplateInstanceAttribute(TemplateInstance.Single)] public ITemplate MyTemplate { get; set; } the above example will enable defines single instance Templates(http://www.nikhilk.net/SingleInstanceTemplates.aspx). i accidentally came across single instance templates and blown away by the power of it. my question is what are all the things possible with ITemplates?? how do we define(use) them (more specifically thru annotations). is there any good documentation available for ITemplates?? (please dont point to msdn)

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• Flex: HTTP request error #2032

  - by alexey

  In Flex 3 application I use HTTPService class to make requests to the server: var http:HTTPService = new HTTPService(); http.method = 'POST'; http.url = hostUrl; http.resultFormat = 'e4x'; http.addEventListener(ResultEvent.RESULT, ...); http.addEventListener(FaultEvent.FAULT, ...); http.send(params); The application has Comet-architecture. So it makes long running requests. While waiting a response for this request, other requests can be made concurrently. The application works in most cases. But sometimes some clients get HTTP request error executing long running request: faultCode:Server.Error.Request faultString:'HTTP request error' faultDetail:'Error: [IOErrorEvent type="ioError" bubbles=false cancelable=false eventPhase=2 text="Error #2032"]. URL: 'http://example.com/ws' I think it depends on user's browser. Any ideas?

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• In cakePHP, how to retrieve joined result from multiple tables

  - by Manish Sharma

  Hi, can anyone tell me, how to retrieve joined result from multiple tables in cakePHP ( using cakePHP mvc architecture). For example, I have three tables to join (tbl_topics, tbl_items, tbl_votes. Their relationship is defined as following: a topic can have many items and an item can have many votes. Now I want to retrieve a list of topics with the count of all votes on all items for each topic. The SQL query for this is written below: SELECT Topic.*, count(Vote.id) voteCount FROM tbl_topics AS Topic LEFT OUTER JOIN tbl_items AS Item ON (Topic.id = Item.topic_id) LEFT OUTER JOIN tbl_votes AS Vote ON (Item.id = Vote.item_id); My problem is I can do it easily using $this-><Model Name>->query function, but this requires sql code to be written in the controller which I don't want. I'm trying to find out any other way to do this (like find()).

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• Optimizing Class Structure

  - by Derek Hammer

  I have the following class structure (abbreviated for sake of time, names changed) in my application. When I was writing the code I felt that the similarities between Action1 and Action2 should warrant some sort of generalization. I've provided the UML Class diagram with the relevant parts (except for the interfaces, which I describe in code below). I was wondering if anyone had an idea on how to make this "better" architecture / class design. Also, actions that are very similar could be implemented in a near-future iteration. Code for interfaces public IActor1 { public Property1 { get; set; } public Property2 { get; set; } } public IActor2 { public Property3 { get; set; } public Property2 { get; set; } }

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• Is it possible to force an error in an Integration Services data flow to demonstrate its rollback?

  - by Matt

  I have been tasked with demoing how Integration Services handles an error during a data flow to show that no data makes it into the destination. This is an existing package and I want to limit the code changes to the package as much as possible (since this is most likely a one time deal). The scenario that is trying to be understood is a "systemic" failure - the source file disappears midstream, or the file server loses power, etc. I know I can make this happen by having the Error Output of the source set to Failure and introducing bad data but I would like to do something lighter than that. I suppose I could add a Script Transform task and look for a certain value and throw an error but I was hoping someone has come up with something easier / more elegant. Thanks, Matt

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• Difference between Document-oriented-DB and Bigtable clones

  - by chen

  We are looking for a suitable storage engine for our weblog history data. We looked at Bigtable's paper and understand it is suitable to us well. However, I also understand that Document-oriented-DB such as MongoDB seems to provide a little more powerful schema power -- i.e, it can model our data as well. I wonder how nowadays ppl choose a scalable NoSQL DB --- I read enough articles like "we looked at A, B and C, and we decided to use C". But I'd like to see some benchmark number. What I am saying is that if MongoDB and the like can provide same level of performance as Bigtable clones, why don't web companies choose it (preparing to deal with various potentially more complex data problem)? Thanks, By the way, I read an article (which convinced me at the moment) saying Cassandra does not fit the M/R operation, any comments?

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• What add-in/workbench framework is the best .NET alternative to Eclipse RCP?

  - by Winston Fassett

  I'm looking for a plugin-based application framework that is comparable to the Eclipse Plugin Framework, which to my simple mind consists of: a core plugin management framework (Equinox / OSGI), which provides the ability to declare extension endpoints and then discover and load plugins that service those endpoints. (this is different than Dependency Injection, but admittedly the difference is subtle - configuration is highly de-centralized, there are versioning concerns, it might involve an online plugin repository, and most importantly to me, it should be easy for the user to add plugins without needing to know anything about the underlying architecture / config files) many layers of plugins that provide a basic workbench shell with concurrency support, commands, preference sheets, menus, toolbars, key bindings, etc. That is just scratching the surface of the RCP, which itself is meant to serve as the foundation of your application, which you build by writing / assembling even more plugins. Here's what I've gleaned from the internet in the past couple of days... As far as I can tell, there is nothing in the .NET world that remotely approaches the robustness and maturity of the Eclipse RCP for Java but there are several contenders that do either #1 or #2 pretty well. (I should also mention that I have not made a final decision on WinForms vs WPF, so I'm also trying to understand the level of UI coupling in any candidate framework. I'm also wondering about platform coupling and source code licensing) I must say that the open-source stuff is generally less-documented but easier to understand, while the MS stuff typically has more documentation but is less accessible, so that with many of the MS technologies, I'm left wondering what they actually do, in a practical sense. These are the libraries I have found: SharpDevelop The first thing I looked at was SharpDevelop, which does both #1 and also #2 in a basic way (no insult to SharpDevelop, which is admirable - I just mean more basic than Eclipse RCP). However, SharpDevelop is an application more than a framework, and there are basic assumptions and limitations there (i.e. being somewhat coupled to WinForms). Still, there are some articles on CodeProject explaining how to use it as the foundation for an application. System.Addins It appears that System.Addins is meant to provide a robust add-in loading framework, with some sophisticated options for loading assemblies with varying levels of trusts and even running the out of process. It appears to be primarily code-based, and pretty code-heavy, with lots of assemblies that serve to insulate against versioning issues., using Guidance Automation to generate a good deal of code. So far I haven't found many System.AddIns articles that illustrate how it could be used to build something like an Eclipse RCP, and many people seem to be wringing their hands about its complexity. Mono.Addins It appears that Mono.Addins was influenced by System.Addins, SharpDevelop, and MonoDevelop. It seems to provide the basics from System.Addins, with less sophisticated options for plugin loading, but more simplicity, with attribute-based registration, XML manifests, and the infrastructure for online plugin repositories. It has a pretty good FAQ and documentation, as well as a fairly robust set of examples that really help paint a picture of how to develop an architecture like that of SharpDevelop or Eclipse. The examples use GTK for UI, but the framework itself is not coupled to GTK. So it appears to do #1 (add-in loading) pretty well and points the way to #2 (workbench framework). It appears that Mono.Addins was derived from MonoDevelop, but I haven't actually looked at whether MonoDevelop provides a good core workbench framework. Managed Extensibility Framework This is what everyone's talking about at the moment, and it's slowly getting clearer what it does, but I'm still pretty fuzzy, even after reading several posts on SO. The official word is that it "can live side-by-side" with System.Addins. However, it doesn't reference it and it appears to reproduce some of its functionality. It seems to me, then, that it is a simpler, more accessible alternative to System.Addins. It appears to be more like Mono.Addins in that it provides attribute-based wiring. It provides "catalogs" that can be attribute-based or directory-based. It does not seem to provide any XML or manifest-based wiring. So far I haven't found much documentation and the examples seem to be kind of "magical" and more reminiscent of attribute-based DI, despite the clarifications that MEF is not a DI container. Its license just got opened up, but it does reference WindowsBase -- not sure if that means it's coupled to Windows. Acropolis I'm not sure what this is. Is it MEF, or something that is still coming? Composite Application Blocks There are WPF and Winforms Composite Application blocks that seem to provide much more of a workbench framework. I have very little experience with these but they appear to rely on Guidance Automation quite a bit are obviously coupled with the UI layers. There are a few examples of combining MEF with these application blocks. I've done the best I could to answer my own question here, but I'm really only scratching the surface, and I don't have experience with any of these frameworks. Hopefully some of you can add more detail about the frameworks you have experience with. It would be great if we could end up with some sort of comparison matrix.

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• How to find a binary logarithm very fast? (O(1) at best)

  - by psihodelia

  Is there any very fast method to find a binary logarithm of an integer number? For example, given a number x=52656145834278593348959013841835216159447547700274555627155488768 such algorithm must find y=log(x,2) which is 215. x is always a power of 2. The problem seems to be really simple. All what is required is to find the position of the most significant 1 bit. There is a well-known method FloorLog, but it is not very fast especially for the very long multi-words integers. What is the fastest method?

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• Quickest and easiest way to implement speech to text conversion for a small speech subset.

  - by sgtpeppers

  Hi, I want to implement a system that receives speech through a microphone on my Mac OS x. I know arbitrary speech recognition is close to impossible without training the system so I'm willing to restrict it to 10 simple sentences. It must recognize with a high degree of accuracy which of these 10 sentences are being spoken, generate the text and add an entry to a remote MySQL database. With these being the architecture of the system I want to implement, could anyone give me an overview of what would be the best way to go about implementing this system? I'm looking for ideas like open source libraries to minimize the coding as this is just a prototype application for a demonstration. Basically I'm looking for a quick and easy solution. Thanks!

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• Can a CouchDB document update handler get an update conflict?

  - by jhs

  How likely is a revision conflict when using an update handler? Should I concern myself with conflict-handling code when writing a robust update function? As described in Document Update Handlers, CouchDB 0.10 and later allows on-demand server-side document modification. Update handlers can process non-JSON formats; but the other major features are these: An HTTP front-end to arbitrarily complex document modification code Similar code needn't be written for all possible clients—a DRY architecture Execution is faster and less likely to hit a revision conflict I am unclear about the third point. Executing locally, the update handler will run much faster and with lower latency. But in situations with high contention, that does not guarantee a successful update. Or does the update handler guarantee a successful update?

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• ASP.Net MVC and N-Tier

  - by Damien

  Greetings, Apologies in advance that I have not researched this toughly enough to answer the question myself, but I imagine it would take me some time and I would rather know now before I invest more time in learning it. I couldn't find anything in my initial research.. Why use ASP.Net MVC if your already using a multi-tier architecture (Data Layer, Logic Layer, Presentation Layer)? Other than the fact the controller has more power than the logic layer. Am I right in thinking I can use nHibernate and all my data access classes, entities, and mappings in the Model part of the MVC? When using controllers, is it best to separate a lot of the logic into a separate class so I can call it from multiple controllers? Or can I call them from the controllers themselves, considering the fact that I would not want all of them to be Actions, just normal methods. Thanks

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• Unit tests only run automatically when active SDK is "simulator"?

  - by Steve Madsen

  I have followed the instructions Apple publishes for unit testing applications on iPhone and things work great when I set the active SDK to "iPhone Simulator". I have it configured to always build and run my tests as part of building the application itself. Apple implies (by omission) that this should work all of the time, but the tests are skipped when I set the active SDK to "iPhone Device". I am also linking with OCMock, and instead of a failing test, this warning is in the build log: ld: warning: in .../build/Debug-iphoneos/OCMock.framework/OCMock, missing required architecture arm in file It's very nice to make the unit test bundle a dependency of the main application, so these tests run at every build, but its utility is greatly diminished if it doesn't work during device builds. Is this a known, but undocumented, limitation?

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