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  • Which is more effective in coding? Reducing line of code and execution of code?

    - by Ayyappan.Anbalagan
    I have this doubt many years. I am wring some code to achieve some functionality. For example I am writing 20 lines of code to achieve the functionality and my co worker writing the code for the same functionality with just 5 lines. Since he used some looping statement to achieve that, but that code will execute around 30 to 50 times. So which is best way of coding? As per my knowledge I always try to reduce coding length as much I can.

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  • Cloud Sample Code on OTN

    - by Oliver Steinmeier
    In recent months our blog has covered many aspects of the overall Oracle Cloud platform, whether it's PaaS (Java Cloud Service, Database Cloud Service) or SaaS (Sales Cloud Application Composer). Teams within Oracle have been busy building demos and proof-of-concept applications using the same technologies, and we have now started posting some of these as code samples on the Oracle Technology Network (OTN).  The zip files include both the source code and helpful information to get you started using the code.  Everything is covered under a BSD license.  In future blog posts we will dive deeper into some of these applications. Do you have any ideas or requests for sample code you would like us to create to help you with your work?  Hit the comments and let us know! 

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  • JEditorPane Code Completion (Part 3)

    - by Geertjan
    The final step is to put an object into the Lookup on key listening in each of the JEditorPanes, e.g., a "City" object for the CityEditorPane and a "Country" object for the CountryEditorPane. Then, within the CompletionProviders, only add items to the CompletionResultSet if the object of interest is in the Lookup. The result is that you can then have different code completions in different JEditorPanes, as shown below: I've also included the Tools | Options | Editor | Code Completion tab, so that the code completion can be customized. The full source code for the example is here: java.net/projects/nb-api-samples/sources/api-samples/show/versions/7.2/misc/CustomerApp

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  • Don't Copy This Code

    Normally, when we release source code we're hoping that other people will build on it and improve it. Today's release of Jarlsberg , a small yet full-featured microblogging...

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  • What are the design principles that promote testable code? (designing testable code vs driving design through tests)

    - by bot
    Most of the projects that I work on consider development and unit testing in isolation which makes writing unit tests at a later instance a nightmare. My objective is to keep testing in mind during the high level and low level design phases itself. I want to know if there are any well defined design principles that promote testable code. One such principle that I have come to understand recently is Dependency Inversion through Dependency injection and Inversion of Control. I have read that there is something known as SOLID. I want to understand if following the SOLID principles indirectly results in code that is easily testable? If not, are there any well-defined design principles that promote testable code? I am aware that there is something known as Test Driven Development. Although, I am more interested in designing code with testing in mind during the design phase itself rather than driving design through tests. I hope this makes sense. One more question related to this topic is whether it's alright to re-factor an existing product/project and make changes to code and design for the purpose of being able to write a unit test case for each module?

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  • How to separate and maintain customer specific code

    - by WYSIWYG
    I am implementing customer specific code and currently following simple approach like if (cusomterId == 23) do it. I want to separate out all the customer related code in separate place. But I have following problems. In code is in 1. Stored procs 2. Plain old classes. 3. Controllers 4. Views I came up with two solutions. First is to create table CustomerFunctionlity with columns CustomerId, FunctionalityName, method/Proc, inputs/outputs With this table I can simply check if exists, execute given function. Another way is creating a factory which returns customer related object for an interface. I am writting small end to end customer specific functionalities. How can I write maintenable code. Thanks

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  • Is testable code actually more stable? [closed]

    - by Xodarap
    A google scholar search turns up numerous papers on testability, including models for computing testability, recommendations for how ones code can be more testable, etc. They all come with the assertion that more testable code is more stable, however I can't find any studies which actually demonstrate this. I tried looking for studies evaluating the effect of testable code vs. quality, however the closest I can find is Improving the Testability of Object Oriented Systems, which discusses the relationship between design flaws and testability. Is testable code is actually more stable? And why, or why not? Please back up your answers with references or evidence to back up your claim.

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  • Using macro to check null values [migrated]

    - by poliron
    My C code contains many functions with pointers to different structs as parameteres which shouldn't be NULL pointers. To make my code more readable, I decided to replace this code: if(arg1==NULL || arg2==NULL || arg3==NULL...) { return SOME_ERROR; } With that macro: NULL_CHECK(arg1,arg2,...) How should I write it, if the number of args is unknown and they can point to different structs?(I work in C99)

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  • C# how to calculate hashcode from an object reference.

    - by Wayne
    Folks, here's a thorny problem for you! A part of the TickZoom system must collect instances of every type of object into a Dictionary< type. It is imperative that their equality and hash code be based on the instance of the object which means reference equality instead of value equality. The challenge is that some of the objects in the system have overridden Equals() and GetHashCode() for use as value equality and their internal values will change over time. That means that their Equals and GetHashCode are useless. How to solve this generically rather than intrusively? So far, We created a struct to wrap each object called ObjectHandle for hashing into the Dictionary. As you see below we implemented Equals() but the problem of how to calculate a hash code remains. public struct ObjectHandle : IEquatable<ObjectHandle>{ public object Object; public bool Equals(ObjectHandle other) { return object.ReferenceEquals(this.Object,other.Object); } } See? There is the method object.ReferenceEquals() which will compare reference equality without regard for any overridden Equals() implementation in the object. Now, how to calculate a matching GetHashCode() by only considering the reference without concern for any overridden GetHashCode() method? Ahh, I hope this give you an interesting puzzle. We're stuck over here. Sincerely, Wayne

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  • Improve Log Exceptions

    - by Jaider
    I am planning to use log4net in a new web project. In my experience, I see how big the log table can get, also I notice that errors or exceptions are repeated. For instance, I just query a log table that have more than 132.000 records, and I using distinct and found that only 2.500 records are unique (~2%), the others (~98%) are just duplicates. so, I came up with this idea to improve logging. Having a couple of new columns: counter and updated_dt, that are updated every time try to insert same record. If want to track the user that cause the exception, need to create a user_log or log_user table, to map N-N relationship. Create this model may made the system slow and inefficient trying to compare all these long text... Here the trick, we should also has a hash column of binary of 16 or 32, that hash the message and the exception, and configure an index on it. We can use HASHBYTES to help us. I am not an expert in DB, but I think that will made the faster way to locate a similar record. And because hashing doesn't guarantee uniqueness, will help to locale those similar record much faster and later compare by message or exception directly to make sure that are unique. This is a theoretical/practical solution, but will it work or bring more complexity? what aspects I am leaving out or what other considerations need to have? the trigger will do the job of insert or update, but is the trigger the best way to do it?

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  • Is sending a hashed password over the wire a security hole?

    - by Ubiquitous Che
    I've come across a system that is in use by a company that we are considering partnering with on a medium-sized (for us, not them) project. They have a web service that we will need to integrate with. My current understanding of proper username/password management is that the username may be stored as plaintext in the database. Every user should have a unique pseudo-random salt, which may also be stored in plaintext. The text of their password must be concatenated with the salt and then this combined string may be hashed and stored in the database in an nvarchar field. So long as passwords are submitted to the website (or web service) over plaintext, everything should be just lovely. Feel free to rip into my understanding as summarized above if I'm wrong. Anyway, back to the subject at hand. The WebService run by this potential partner doesn't accept username and password, which I had anticipated. Instead, it accepts two string fields named 'Username' and 'PasswordHash'. The 'PasswordHash' value that I have been given does indeed look like a hash, and not just a value for a mis-named password field. This is raising a red flag for me. I'm not sure why, but I feel uncomfortable sending a hashed password over the wire for some reason. Off the top of my head I can't think of a reason why this would be a bad thing... Technically, the hash is available on the database anyway. But it's making me nervous, and I'm not sure if there's a reason for this or if I'm just being paranoid.

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  • Hashing Function for Map C++

    - by Josh
    I am trying to determine a hash function which takes an input (i, k) and determines a unique solution. The possible inputs for (i, k) range from 0 to 100. Consider each (i, k) as a position of a node in a trinomial tree. Ex: (0, 0) can diverge to (1, 1) (1, 0) (1, -1). (1, 1) can diverge to (2, 2) (2, 1) (2, 0). Sample given here: http://www.google.com/imgres?imgurl=http://sfb649.wiwi.hu-berlin.de/fedc_homepage/xplore/tutorials/stfhtmlimg1156.gif&imgrefurl=http://sfb649.wiwi.hu-berlin.de/fedc_homepage/xplore/tutorials/stfhtmlnode41.html&h=413&w=416&sz=4&tbnid=OegDZu-yeVitZM:&tbnh=90&tbnw=91&zoom=1&usg=__9uQWDNYNLV14YioWWbrqPgfa3DQ=&docid=2hhitNyRWjI_DM&hl=en&sa=X&ei=xAfFUIbyG8nzyAHv2YDICg&ved=0CDsQ9QEwAQ I am using a map map <double, double> hash_table I need a key value to be determined from pairs (i, k) to hash to to value for that (i, k) So far I was only able to come up with linear functions such as: double Hash_function(int i, int k) { //double val = pow(i, k) + i; //return (val % 4294967296); return (i*3.1415 + k*i*9.12341); } However, I cannot determine a unique key with a certain (i, k). What kind of functions can I use to help me do so?

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  • The different of SHA512 between openssl and php

    - by solomon_wzs
    Here is C code: #include <openssl/sha.h> #include <stdio.h> char *hash_sha512(char *data){ SHA512_CTX ctx; char *md=malloc(sizeof(char)*(SHA512_DIGEST_LENGTH+1)); SHA512_Init(&ctx); SHA512_Update(&ctx, data, strlen(data)); SHA512_Final(md, &ctx); md[SHA512_DIGEST_LENGTH]='\0'; return md; } int main(int argc, char *argv[]){ str=hash_sha512("GFLOuJnR19881218"); printf("%s\n", str); free(str); return 1; } The output: ?<?4????IIA[r?? ?#? 6p?8jD????J?b9?????^X? Here is PHP code: $hash=hash('sha512', 'GFLOuJnR19881218', TRUE); The output: ?<??4??j??II?-A[r???? ??#??D6p?8jD???????J?b9?????^X? The results of C code and PHP code are different, what is wrong with my code?

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  • Absent Code attribute in method that is not native or abstract

    - by kerry
    I got the following, quite puzzling error today when running a unit test: java.lang.ClassFormatError: Absent Code attribute in method that is not native or abstract in class file javax/servlet/http/Cookie A google search found this post, which explains that it is caused by having an interface in the classpath, and not an actual implementation. In this case it’s the java-ee interface. To fix this I added the jetty servlet api implementation to my pom: jetty javax.servlet test Piece of cake. I have run in to this before, so I figured I would capture the fix here in case I run in to it again.

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  • Are there code signing certificates cheaper than US$99 per year? [closed]

    - by gerryLowry
    K Software discounts Comodo code signing certificates to US$99 per year. In the past, I've seen Commodo code signing certificates for US$80. I'm excluding CAcert which AFAIK are FREE but are not covered by browsers like Internet Explorer AFAIK. QUESTION: What is the best price per year for a code signing certificate? Thank you ~~ gerry (lowry) Edit: **THIS SHOULD NOT HAVE BEEN CLOSED** from the FAQ: http://stackoverflow.com/faq ---------------------------- What kind of questions can I ask here? Programming questions, of course! As long as your question is: * detailed and specific <====== YES! * written clearly and simply <====== YES! * of interest to other programmers <====== YES! I've been programming for over 40 years. http://gerrylowryprogrammer.com/ I've taught computer programming at the community college level. I'm a Star level contributer to forums.asp.net. http://forums.asp.net/members/gerrylowry.aspx IMO, I've a very good idea what is of interest to other programmers. MORE INFORMATION http://en.wikipedia.org/wiki/Code_signing http://msdn.microsoft.com/en-us/library/ms537361%28VS.85%29.aspx also: via Google: code signing Ensuring the integrity of code and executables that one distributes is just as much about programming as is knowing how to flip bits in assembler, use delegates in C#, and use the BDD context/specification still of "test first testing".

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  • What does the status code of the Perl interpreter mean?

    - by futureelite7
    Hi, This might sound slightly confusing, but please bear with me. I'm trying to execute a copy of the Perl interpreter using Java's Runtime.exec(). However, it returned error code 9. After running the file a few times, the perl interpreter mysteriously started to return code 253 with no changes in my command at all. What does code 253 / code 9 mean? A google search for perl interpreter's exit codes turned up nothing. Where can I find a list of exit codes for the Perl interpreter? Thanks!

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  • How can I use Code Contracts in a C++/CLI project?

    - by Daniel Wolf
    I recently stumbled upon Code Contracts and have started using them in my C# projects. However, I also have a number of projects written in C++/CLI. For C# and VB, Code Contracts offer a handy configuration panel in the project properties dialog. For a C++/CLI project, there is no such panel. From the documentation, I got the impression that adding Code Contracts support to a C++/CLI project should be a simple matter of calling some external tools as part of the build process (namely ccrefgen.exe, cccheck.exe, and ccrewrite.exe). However, the number of command line options and restrictions concerning the call sequence have me somewhat intimidated. Can anybody point me to a simple way to run the Code Contracts tools as an automated part of the build process in Visual Studio?

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  • How should I move my code from dev to production?

    - by Teddy
    I have created a PHP web-application. I have 3 environments: DEV, TEST, PROD. What's a good tool / business practice for me to move my PHP web-application code from DEV to TEST to the PROD environment? Realizing that my TEST environment still only connects to my TEST database; whereas, I need to PROD environment to connect to my PROD database. So the code is mostly the same, except that I need to change my TEST code once moved into PROD to connect to the PROD database and not TEST database. I've heard of people taking down Apache in such away that it doesn't allow new connections and once all the existing connections are idle it simply brings down the web server. Then people manually copy the code and then manually update the config files of the PHP application to also point to the PROD instance. That seems terribly dangerous. Does a best practice exists?

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  • PHP: How should I move my code from dev to production?

    - by Teddy
    I have created a PHP web-application. I have 3 environments: DEV, TEST, PROD. What's a good tool / business practice for me to move my PHP web-application code from DEV to TEST to the PROD environment? Realizing that my TEST environment still only connects to my TEST database; whereas, I need to PROD environment to connect to my PROD database. So the code is mostly the same, except that I need to change my TEST code once moved into PROD to connect to the PROD database and not TEST database. I've heard of people taking down Apache in such away that it doesn't allow new connections and once all the existing connections are idle it simply brings down the web server. Then people manually copy the code and then manually update the config files of the PHP application to also point to the PROD instance. That seems terribly dangerous. Does a best practice exists?

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  • Can I make Visual Studio's code completion window more like Eclipse (Java)?

    - by Matt
    Is it possible to make Visual Studio 2010's code completion window more like that of Eclipse (Java)? In particular, I'd love the code completion window to give me a variable's type, and a method's return type and expected parameters, without needing to hover the highlight over that particular variable/method. VS's code completion's little icons that indicate if something is a property, method etc are useful, but they just aren't enough.

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  • WCF code generation for large/complex schema (HR-XML/OAGIS) - is there an alternative?

    - by Sasha Borodin
    Hello, and thank you for reading. I am implementing a WCF Service based on a predefined specification (HR-XML 3.0). As such, I am starting with the schema, and working my way back to code. There are a number of large Schema documents (which import yet more Schema documents) related to my implementation, provided by this specification. I am able to generate code using xsd.exe, by supplying the "main" and "supporting" xsd files as arguments. But there are several issues, and I am wondering if this is the right approach. there are litterally hundreds of classes - the code file is half a meg in size duplicate classes (ex. Type, Type1 - which both represent the same type) there are classes declared as inheriting from a base class, but that base class is not generated/defined I understand that there are limitations to the types of Schema supported by svcutil.exe/xsd.exe when targeting the DataContractSerializer and even XmlSerializer. My question is two-fold: Are code generation "issues" fairly common when dealing with larger, modular xsd files? Has anyone had success with generating data contracts from OAGIS or HR-XML schema? Given the above issues, are there better approaches to this task, avoiding generating code and working with concrete objects? Does it make better sence to read and compose a SOAP message directly, while still taking advantage of the rest of the WCF framework? I understand that I am loosing the convenience of working with .NET objects, and the framekwork-provided (de)serialization; given these losses, would it still be advantageous to base my Service on WCF? Is there some "middle ground" between working with .NET types and pure XML? Thank you very much! -Sasha Borodin DFWHC.org

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