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Navneet Kumar

http://www.theserverside.com/tt/articles/content/SpringFramework/article.html - 0 views

www.theserverside.com/...article.html

framework inroduction j2ee java spring tdd testing unit_test

shared by Navneet Kumar on 12 Mar 07 - Cached
  • Spring has a layered architecture, meaning that you can choose to use just about any part of it in isolation, yet its architecture is internally consistent
  • it's easy to introduce Spring incrementally into existing projects
  • Inversion of Control and Dependency Injection
  • ...2 more annotations...
  • POJO-based programming model
  • EJB interception
  • Navneet Kumar on 12 Mar 07
     
    Introduction to the J2EE spring framework with test driven development
Navneet Kumar

defmacro - Functional Programming For The Rest of Us - 0 views

www.defmacro.org/...fp.html

block closure continuity erlang functional_language language programming

shared by Navneet Kumar on 02 Jun 07 - Cached
  • In a lazy language you have no guarantee that the first line will be executed before the second! This means we can't do IO, can't use native functions in any meaningful way (because they need to be called in order since they depend on side effects), and can't interact with the outside world! If we were to introduce primitives that allow ordered code execution we'd lose the benefits of reasoning about our code mathematically
  • continuations, monads, and uniqueness typing.
  • Alonzo Church developed a formal system called lambda calculus. The system was essentially a programming language for one of these imaginary machines
  • ...18 more annotations...
  • Functions that operate on other functions (accept them as arguments) are called higher order functions.
  • currying is used to reduce the number of arguments
  • only executes code when it's required
  • A lazy compiler thinks of functional code exactly as mathematicians think of an algebra expression - it can cancel things out and completely prevent execution, rearrange pieces of code for higher efficiency, even arrange code in a way that reduces errors, all guaranteeing optimizations won't break the code.
  • John McCarthy (also a Princeton graduate) developed interest in Alonzo Church's work. In 1958 he unveiled a List Processing language (Lisp)
  • Lisp machine - effectively a native hardware implementation of Alonzo's lambda calculus!
  • it was proved that lambda calculus is equivalent to a Turing machine.
  • It turns out that functional programs can keep state, except they don't use variables to do it. They use functions instead. The state is kept in function parameters, on the stack. If you want to keep state for a while and every now and then modify it, you write a recursive function
  • Erlang engineers have been upgrading live systems without stopping them for years.
  • Erlang systems are not scalable and reliable. Java systems are. Erlang systems are simply rock solid
  • Ericsson designed a functional language called Erlang for use in its highly tolerant and scalable telecommunication switches.
  • Continuation Passing Style or CPS
  • A "continuation" is a parameter we may choose to pass to our function that specifies where the function should return.
  • continuations are a generalization of functions.
  • CPS version needs no stack! No function ever "returns" in the traditional sense, it just calls another function with the result instead. We don't need to push function arguments on the stack with every call and then pop them back, we can simply store them in some block of memory and use a jump instruction instead. We'll never need the original arguments - they'll never be used again since no function ever returns!
  • What does the stack contain? Simply the arguments, and a pointer to memory where the function should return. Do you see a light bulb? The stack simply contains continuation information! The pointer to the return instruction in the stack is essentially the same thing as the function to call in CPS programs!
  • A continuation and a pointer to the return instruction in the stack are really the same thing, only a continuation is passed explicitly, so that it doesn't need to be the same place where the function was called from
  • When we get a current continuation and store it somewhere, we end up storing the current state of our program - freezing it in time. This is similar to an OS putting itself into hibernation. A continuation object contains the information necessary to restart the program from the point where the continuation object was acquired.
  • Navneet Kumar on 02 Jun 07
     
    deals from the history of functional languages
    what are functional languages, benefits

Navneet Kumar

QuirksBlog: The AJAX response: XML, HTML, or JSON? - 1 views

www.quirksmode.org/...the_ajax_respon.html

ajax javascript json vs xml

shared by Navneet Kumar on 12 Mar 07 - Cached
  • Navneet Kumar on 12 Mar 07
     
    JSON vs XML in Ajax
Navneet Kumar

Structure and Interpretation of Computer Programs - 1 views

mitpress.mit.edu/...book.html

algorithms ebook online.book programming

shared by Navneet Kumar on 17 Jun 07 - Cached
  • Navneet Kumar on 17 Jun 07
     
    full text html book "Structure and Interpretation of Computer Programs" by Albenson and Sussman at MIT press
Navneet Kumar

SitePoint CSS HTML DOM Reference - 1 views

reference.sitepoint.com/css

CSS HTML JavaScript Reference DOM

shared by Navneet Kumar on 25 Jan 11 - Cached
  • Navneet Kumar on 25 Jan 11
     
    SitePoint Reference
Navneet Kumar

HTTP/1.1: Method Definitions - 0 views

www.w3.org/...rfc2616-sec9.html

Browser Web HTTP RFC REST W3C Protocol Specification

shared by Navneet Kumar on 30 Aug 07 - Cached
  • GET and HEAD methods SHOULD NOT have the significance of taking an action other than retrieval.
  • Navneet Kumar on 30 Aug 07
     
    http method definitions. GET, POST, PUT, DELETE, HEAD, TRACE, CONNECT
Thiyagarajan Sadasivam

Essential Vim - 0 views

www.pixelbeat.org/vim.tips.html

vim editors shortcuts tips

shared by Thiyagarajan Sadasivam on 30 Jun 10 - Cached
  • Thiyagarajan Sadasivam on 30 Jun 10
     
    Essential keyboard shortcuts and commands for VIM
Navneet Kumar

MySQL AB :: MySQL 3.23, 4.0, 4.1 Reference Manual :: A.2 Server Error Codes and Messages - 1 views

dev.mysql.com/...error-messages-server.html

error_codes mysql

shared by Navneet Kumar on 27 Aug 07 - Cached
  • Navneet Kumar on 27 Aug 07
     
    appendix of mysql error codes and their  messages
Navneet Kumar

The Spring Framework - Reference Documentation - 0 views

www.springframework.org/...index.html

documentation framework j2ee java reference spring

shared by Navneet Kumar on 12 Mar 07 - Cached
  • Navneet Kumar on 12 Mar 07
     
    The Spring Framework - Reference Documentation
Navneet Kumar

perlintro - perldoc.perl.org - 0 views

perldoc.perl.org/perlintro.html

documentation manual perl tutorial

shared by Navneet Kumar on 12 Mar 07 - Cached
  • Navneet Kumar on 12 Mar 07
     
    perl intro tutorial     
Navneet Kumar

Ken Arnold's Blog: Generics Considered Harmful - 0 views

weblogs.java.net/...generics_consid_1.html

discussion generics java

shared by Navneet Kumar on 22 Aug 07 - Cached
  • this: Enum is actually a generic class defined as Enum<T extends 
  • When used in public interfaces, generics are also invaluable to enforce correctness, prevent bugs and reduce testi
  • generics is reifying type relationships that are otherwise implic
  • ...4 more annotations...
  • The problem is that generics don't get on with arrays. The solution is obvious: ditch arrays. From a practical point of view, there's not a great deal of point in returning arrays from methods instead of collections of s
  • Note the circular reference in "Unique<T extends Unique>" It means that the implementing class needs to provide another unique class as the namespace for it's Id's. The really freaky thing is that it can provide itself. :) These two interfaces enable a way to describe uniquely identified objects with heirarchical namespaces in a typesafe manner. How much complex code did that save?
  • ype". You only need generics in strictly typed function dispatch languages like C++ and Java. You don't need them in message passing dynamically typed languages like Smalltalk and Objective C. To work around the first rule - "strict static typing doesn't really work all the time", we get hacks like templates and generics
  • call the Elvis/Einstein b
  • Navneet Kumar on 22 Aug 07
     
    discussion on java generics, too complex, dangerous or useful, type safety, when n how to use
Navneet Kumar

Javascript Closures - 0 views

www.jibbering.com/...closures.html

closures computr_science javascript languages

shared by Navneet Kumar on 23 Apr 07 - Cached
  • If a value is assigned and the actual object does not have a property with the corresponding name a property of that name is created and the value is assigned to it. If it has the property then its value is re-set.
  • all objects may have prototypes, and prototypes are objects so they, in turn, may have prototypes, which may have prototypes, and so on forming what is called the prototype chain. The prototype chain ends when one of the objects in the chain has a null prototype. The default prototype for the Object constructor has a null prototype so
  • When a javascript function is called it enters an execution context, if another function is called (or the same function recursively) a new execution context is created and execution enters that context for the duration of the function call. Returning to the original execution context when that called function returns. Thus running javascript code forms a stack of execution contexts
  • ...5 more annotations...
  • First, in the execution context of a function, an "Activation" object is created.
  • The next step in the creation of the execution context for a function call is the creation of an arguments object, which is an array-like object with integer indexed members corresponding with the arguments passed to the function call, in order.
  • Next the execution context is assigned a scope. A scope consists of a list (or chain) of objects.
  • the Activation object is used as the Variable object (note this, it is important: they are the same object). Named properties of the Variable object are created for each of the function's formal parameters, and if arguments to the function call correspond with those parameters the values of those arguments are assigned to the properties (otherwise the assigned value is undefined)
  • It is the fact that the Activation object, with its arguments property, and the Variable object, with named properties corresponding with function local variables, are the same object, that allows the identifier arguments to be treated as if it was a function local variable.
  • Navneet Kumar on 10 Jul 07
     
    Detailed description of How javascript lanaguage handles resolution of property names, scopes of the functions, the importance prototype, and how closures are ultimately formed taking into consideration the above facts
Navneet Kumar

MySQL AB :: High Performance MySQL Chapter 6: Server Performance Tuning - 0 views

dev.mysql.com/...ch06.html

mysql optinization performance tuning

shared by Navneet Kumar on 07 Sep 07 - Cached
  • Navneet Kumar on 07 Sep 07
     
    performance tuning for high performnace mysql
Navneet Kumar

Inversion of Control Containers and the Dependency Injection pattern - 0 views

www.martinfowler.com/...injection.html

dependencyinjection designpatterns inversionofcontrol martinfowler spring

shared by Navneet Kumar on 12 Mar 07 - Cached
  • The main difference is that I expect a component to be used locally (think jar file, assembly, dll, or a source > > i mport). A service will be used remotely through some remot >e > i nterface, either synchronous or asynchronous > >
  • configuration through XML files and also through code
    • Navneet Kumar
      Navneet Kumar on 12 Mar 07
       
      or can be stored in a DB table
  • dynamic service locator
  • ...16 more annotations...
  • Dependency injection and a service locator aren't necessarily mutually exclusive concepts.
  • With service locator the application class asks for it explicitly by a message to the locator. With injection there is no explicit request, the service appears in the application class - hence the inversion of control.
  • with a Service Locator every user of a service has a dependency to the locator. The locator can hide dependencies to other implementations, but you do need to see the locator.
  • In this kind of scenario I don't see the injector's inversion as providing anything compelling.The difference comes if the lister is a component that I'm providing to an application that other people are writing. In this case I don't know much about the APIs of the service locators that my customers are going to use. Each customer might have their own incompatible service locators
  • Since with an injector you don't have a dependency from a component to the injector, the component cannot obtain further services from the injector once it's been configured.
  • frameworks should minimize their impact upon application code, and particularly should not do things that slow down the edit-execute cycle. Using plugins to substitute heavyweight components does a lot help this process, which is vital for practices such as Test Driven Development.
  • a more general issue with object-oriented programming - should you fill fields in a constructor or with setters.
  • Another advantage with constructor initialization is that it allows you to clearly hide any fields that are immutable by simply not providing a setter. I think this is important - if something shouldn't change then the lack of a setter communicates this very well
  • The problem with classic Factory Methods for components assembly is that they are usually seen as static methods, and you can't have those on interfaces. You can make a factory class, but then that just becomes another service instance. A factory service is often a good tactic, but you still have to instantiate the factory using one of the techniques here
  • Factory Methods
  • start with constructor injection, but be ready to switch to setter injection
  • One case is where you have a simple application that's not got a lot of deployment variation. In this case a bit of code can be clearer than separate XML file.
  • configuration files or code on an API to wire up services
  • the Java world at the moment is a cacophony of configuration files,
  • using aspect oriented ideas with these containers
    • Navneet Kumar
      Navneet Kumar on 12 Mar 07
       
      Aspect Oriented Programming AOP. can be possible with IoC.
  • When building application classes the two are roughly equivalent, but I think Service Locator has a slight edge due to its more straightforward behavior. However if you are building classes to used in multiple applications then Dependency Injection is a better choice.
  • Navneet Kumar on 12 Mar 07
     
    article by martin fowler on Inversion of control and dependency injection design patterns which are used in the spring framework.
Navneet Kumar

JavaScript - Strings - 2 views

www.quirksmode.org/...strings.html

javascript string

shared by Navneet Kumar on 12 Mar 07 - Cached
  • Navneet Kumar on 12 Mar 07
     
    javascript string handling
Navneet Kumar

XSS (Cross Site Scripting) Cheat Sheet - 0 views

ha.ckers.org/xss.html

hacking xss

shared by Navneet Kumar on 17 Mar 08 - Cached
  • Navneet Kumar on 17 Mar 08
     
    various ways of XSS
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