Exception Handling is a programming language construct intended to handle a condition's occurrence that alters or changes the normal flow of execution. Exceptions are very significant and have a good control over error handling.
In the process of development of software, any exception handling verification must be conducted in a highly automated manner. The test cases must be created in a scientific way. There are various systems available commercially. These systems perform testing in a scientific and repeatable manner. Systems like Service Assurance platform from MU Dynamic can easily verify exception handling for implementation of software codes.
There are various programming languages including C++, Actionscript, .Net languages, JAVA, Ada, Python, Prolog, Ruby, Visual Prolog, Objective C, Ocaml and ECMAscript and Eiffel that have built-in support for exception handling. PHP (version 5) also boasts an exception model just like other programming languages. The exception model in PHP follows some important statement keywords. These keywords are: Try, Throw and Catch. Let us see what the keywords mean:
Try: Most functions using an exception must be surrounded in a try block of statement. The code will normally continue if the exception does not trigger. If it is triggered, an exception is thrown.
Throw: A triggered exception is thrown. It is important to know that each throw must have a 'catch'.
Catch: A 'catch' block of statement recovers an exception and builds an object containing the information of the exception.
A 'thrown' exception means that the code following the statement is unexecuted. This compels PHP to find the first matching catch block. If the catch block fails to 'catch' the exception, a PHP fatal error is issued and is stated as 'Uncaught Exception'
These rules and keywords are very important for web & software development companies that specialize in the development of software. Most modern software applications have to face design challenges in case of exception handling strategies. Web & software development companies design a solid exception handling strategy to recognize a failed process to the point when it cannot be handled by the software portion economically.
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I am the webmaster at www.synapseindia.com ' A web & software development company offering high quality and cost effective offshore web development services to organizations around the world.
