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Questions tagged [design-decisions]

general tips and guidelines for designing better applications, regarding APIs, Architecture and internal structures.

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Why comparing an Integer object with a primitive int throws null pointer exception when the Integer object is null in Java

Why does the code below throw null pointer exception? I would expect the equivalence to be simply false. Can someone explain what happens under the hood and the reason for this design decision? Integer i = null; System.out.println(i == 10); //…
CEGRD
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What is the best way to validate if a value with decimals is in a defined range

I have a file with thresholds defined and these threshold are use to help to take decision. The values looks like this: "thresholds":[ { "min": 0.0, "max": 0.25, "text": "VERY UNLIKELY" }, { "min": 0.26, "max": 0.50, "text": "UNLIKELY" } …
Jonathan Anctil
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Multi Tenant vs Single Tenant?

I am about to build a SAAS product using Rail and Postgres. I would like to know if I should follow schema level, sub-domain based multi tenancy or a single tenant application is good enough Architecture? My requirement has no dependability of data…
Shazad Maved
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New to java stuck on Decision Making in java

I have created a class named Bicycle now I want to limit the gear of my bicycle to 6. A value greater than 6 will give an error and message will be displayed: System.out.println "Error...!! Please enter a number between 1-6". Can someone tell me…
Sayury
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Programming languages where indexing starts at 1?

Possible Duplicate: List of 1-indexed programming languages? Besides AWK, are there other programming languages where indexing starts at 1 instead of 0?
helpermethod
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CSS code structure decision

I'm currently working on an header for some website. This header consists of two different designs: Floating/horizontal header: +-------------------------------------------------------------------------+ | +--------------+ …
user6105890
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Why can't you create a setter without getter in scala?

I found in Scala: can't write setter without getter? that you can't create a setter without getter: The interpretation of an assignment to a simple variable x = e depends on the definition of x. If x denotes a mutable variable, then the…
Rik Schaaf
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Which db should I choose for my transaction logging

I have a database question. I am developing an application where users sends some request and gets an answer from a vendor. I have a server receiving the request (through a rest call or a running web service, haven't decided which yet). Whenever a…
PNS
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Tough inheritance database/model design decision

I have Users which can be either TypeS, TypeC, or TypeA. I have models for each of these types to store additional information. Now, in the Users table, should I have 3 nullable foreign-key fields to designate which type they are 2 fields, 1 with…
mpen
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Is it ever useful to have reference type declared as const?

Why would someone ever do: const object useless = null; const IEnumerable meaningless = null; Eric Lippert says features are unimplemented by default and every possibility adds more effort in testing, maintaining etc... Why would a null value for a…
nawfal
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Omitting the virtual destructor when the only derived class adds no extra variables

I have a class Literal which is really just a wrapper for (const int). I want to have a second class PositiveLiteral which inherits from Literal, but has a constructor that asserts that its value is positive. class Literal { public: Literal(int…
dspyz
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Best way to store course notes / medium sized text digitally - Must be: efficient, easy to display on web, flexible

I am building my personal web site and I want to store my course notes on it. My course notes are currently on paper so I will be typing them up. I am thinking about storing each of my courses in its own XML file with a structure that goes like: The…
user2780349
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Javascript - Distance (in pixels) - Decision

I have a simple javascript animation, where two cowboys (iamges) 'race' each other based on a random interval number. What I can't find out how to do is for the script to take a decision on who is the winner, meaning if a cowboy reaches a…
Brian
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What should be the expected behavior on this user decision?

I have this application where the users can change text files and when they forget to save them, a little message pops up reminding them that the changes are not saved and asks them if they want to save the changes or not with two buttons "Yes" and…
rfgamaral
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Database schema for multiple checkboxes

I currently have a Users table and now want to add other user-related information for a particular user. The form that accepts this information has fields like languages and OS each with a list of options with checkboxes. For Example: Languages…
Mark
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