Error Handling Mechanisms
Contents |
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the error handling mechanism in informatica company Business Learn more about hiring developers or posting ads with us Programmers Questions error handling and logging mechanism in informatica Tags Users Badges Unanswered Ask Question _ Programmers Stack Exchange is a question and answer site for professional programmers interested in what is the error handling mechanism available in odi conceptual questions about software development. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the
Error Handling Java
top The modern way to perform error handling… up vote 104 down vote favorite 30 I've been pondering this problem for a while now and find myself continually finding caveats and contradictions, so I'm hoping someone can produce a conclusion to the following: Favour exceptions over error codes As far as I'm aware, from working in the industry for four years, reading books and blogs, etc. the current best practice for handling error handling in c errors is to throw exceptions, rather than returning error codes (not necessarily an error code, but a type representing an error). But - to me this seems to contradict... Coding to interfaces, not implementations We code to interfaces or abstractions to reduce coupling. We don't know, or want to know, the specific type and implementation of an interface. So how can we possibly know what exceptions we should be looking to catch? The implementation could throw 10 different exceptions, or it could throw none. When we catch an exception surely we're making assumptions about the implementation? Unless - the interface has... Exception specifications Some languages allow developers to state that certain methods throw certain exceptions (Java for example, uses the throws keyword.) From the calling code's point of view this seems fine - we know explicitly which exceptions we might need to catch. But - this seems to suggest a... Leaky abstraction Why should an interface specify which exceptions can be thrown? What if the implementation doesn't need to throw an exception, or needs to throw other exceptions? There's no way, at an interface level, to know which exceptions an implementation may want to throw. So... To conclude Why are exceptions preferred when they seem (in my eyes) to contradict software best practi
processing – often changing the normal flow of program execution. It is provided by specialized programming language constructs or computer hardware mechanisms. In general, an exception is handled (resolved) by error handling best practices saving the current state of execution in a predefined place and switching
What Is Error Handling
the execution to a specific subroutine known as an exception handler. If exceptions are continuable, the handler may
Exception Handling In C++
later resume the execution at the original location using the saved information. For example, a floating point divide by zero exception will typically, by default, allow the program to be http://programmers.stackexchange.com/questions/147059/the-modern-way-to-perform-error-handling resumed, while an out of memory condition might not be resolvable transparently. Alternative approaches to exception handling in software are error checking, which maintains normal program flow with later explicit checks for contingencies reported using special return values or some auxiliary global variable such as C's errno or floating point status flags; or input validation to preemptively filter exceptional cases. https://en.wikipedia.org/wiki/Exception_handling Some programmers write software with error reporting features that collect details that may be helpful in fixing the problem, and display those details on the screen, or store them to a file such as a core dump, or in some cases an automatic error reporting system such as Windows Error Reporting can automatically phone home and email those details to the programmers. Contents 1 Exception handling in hardware 1.1 Hardware exception handling/traps: IEEE 754 floating point 2 Exception handling in software 2.1 History 2.2 Termination semantics 2.3 Criticism 2.4 Exception support in programming languages 2.5 Exception handling implementation 2.6 Exception handling based on design by contract 2.7 Uncaught exceptions 2.8 Static checking of exceptions 2.8.1 Checked exceptions 2.8.2 Views on usage 2.9 Dynamic checking of exceptions 2.10 Exception synchronicity 2.11 Condition systems 2.11.1 Continuable exceptions 2.11.2 Restarts separate mechanism from policy 3 See also 4 References 5 External links Exception handling in hardware[edit] Hardware exception mechanisms are processed by the CPU. It is intended to support error detection and redirects the program flow to error handling service routines. The state b
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the http://stackoverflow.com/questions/5316228/what-are-the-common-error-handling-mechanisms-for-the-observer-pattern company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions http://stackoverflow.com/questions/15542608/design-patterns-exception-error-handling Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up What are the common error handling mechanisms for the Observer pattern? up vote 5 down vote favorite 2 I'm learning error handling about design patterns and one thing I noticed in pretty much all the example implementations of the Observer pattern is that there isn't really any error handling in the Subject's register/unregister methods. This got me wondering how / if this is done. How specifically to handle errors will depend on the application's needs but what are the common ways to handle that sort of error? For example, I try to register an Observer but error handling mechanism the registration fails. Does that error just silently occur and it's acceptable that that particular Observer just won't get updates? The Subject is none the wiser I guess and can carry on notifying the Observers that DID successfully register. I've noticed I sometimes have a hard time judging how much error checking is enough in a program and wonder if this is one of those cases where I'm over thinking every contingency. design-patterns error-handling observer-pattern share|improve this question asked Mar 15 '11 at 18:22 MTLPhil 1819 +1 Good question –Nilesh Mar 16 '11 at 6:24 add a comment| 2 Answers 2 active oldest votes up vote 2 down vote accepted If registering the Observer fails, you should definitely raise some error. The client of your code expects to be notified about changes in the Subject and it must be able to react when he is not able to do this. But failing to register one observer shouldn't affect both Subject and other Observers at all. In fact, you might even have an observer for failed observer registration events - meta-observer ;-). But much more interesting aspect IMHO is what should happen when Observer throws an exception from within its notify method? Should the rest of observers be called? Should this observer be deregistered? Who is re
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Design patterns: exception / error handling up vote 25 down vote favorite 19 Is there any resource (web or book) describing exception handling / error handling design patterns? There is a lot of literature on how to write clean code, and there are a lot of books covering design patterns. I have, however, never seen any design pattern covering the issue of where and how best to handle errors and how best to propagate an error appearing in a low-level function up the levels of abstraction. design-patterns exception-handling share|improve this question asked Mar 21 '13 at 8:31 JohnB 6,75411645 add a comment| 3 Answers 3 active oldest votes up vote 30 down vote accepted These patterns and best practices are often bound to a specific platform/language, so they are the first place to look for them. Exception patterns wiki is a general patterns resource. As an example check the following links for java: Best Practices for Exception Handling 15 Best practices about exception handling Exception-Handling Antipatterns Going through such materials would give you a general idea to follow in exception handling mechanisms. Also check other SO questions: Exception handling pattern Java Style: Properly handling exceptions share|improve this answer edited May 7 '14 at 12:02 xorrr 72 answered Mar 21 '13 at 8:37 Blaise 2,33221842 add a comment| up vote 1 down vote Best approach is never to swallow any exceptions wi