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  • How to catch 'exceptions' for out of order execution in Workflow Foundation 4?

    - by Alex Key
    Hi, I am attempting to model a worklfow using a "WCF Workflow Service" in .net / vs 2010 that needs to handle out of order execution gracefully (but not allow it - if thath makes sense!?) For example I have 2 receive activities one called Initialize and the other called GetValue inside a FlowChart. In most cases Initialize should be called first and GetValue after (as modled in the flow chart). However if GetValue is executed before Initialize I do not want to return an "out of order" exception (although when I look at the WCF test client, I can't actually see an exception). But instead a custom exception saying something like "you must initialize first". In theory I could model this with lots of parallel activities and conditions to check if Initialized / Running / Terminated etc. But the business process I am modelling if very very similar to a state machine... except it must handle people executing things in the wrong order. Ideally I would like to catch the "out of order" exception (thought I don't think it's really an exception as such), check the 'exception' to see which function was attempted to run and then handle it. I have done some research around enabling AllowBufferedReceive. However I don't want to be able to execute out of order (I don't think), but instead give a detailed response if it does happen. I've looked at the new beta state machine template for WF 4 - but i'm not sure if it does what i'm after? I'm not sure if I have the wrong end of the stick, so any help would be greatly appreciated. [EDIT] To help clarify... Sorry it's a tricky one to explain. The standard I am trying to implement (the e-learning standard SCORM RTE) is structured like a state machine i.e. certain functions can only be executed in certain states. However the standard specifies that if the calling clients tries to execute a function that it is not meant to, then a warning should be issued... for example "you cannot use GetValue(), because you have not yet Initialized". Ideally I'd like to structure the workflow as the theoretical state machine and not need to have to use multiple if/else's to handle all the scenarios where something could be executed out-of-order. I'd like to catch a out-of-order exception (but I don't think there is such an exception - as it's not in the debugger) and rethrow it.

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  • Try catch finally blocks.. do i still need them?

    - by Phil
    I am handling errors via my global.asax in this method: Dim CurrentException As Exception CurrentException = Server.GetLastError() Dim LogFilePath As String = Server.MapPath("~/Error/" & DateTime.Now.ToString("dd-MM-yy.HH.mm") & ".txt") Dim sw As System.IO.StreamWriter = New System.IO.StreamWriter(LogFilePath) sw.WriteLine(DateTime.Now.ToString) sw.WriteLine(CurrentException.ToString()) sw.Close() In my code I currently have no other error handling. Should I still insert try, catch, finally blocks? Thanks.

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  • What should be the RegEx if I want to find the text between the phrases " IF (NEW." and " !"?

    - by Parth
    What should be the RegEx if I want to find the text between the phrases " IF (NEW." and " !"? Likewise I am thinking of the pattern as $pattern = '/(?<= IF (NEW.)[^ !]+/'; I am matching it as $input = $row4['ACTION_STATEMENT']; preg_match_all($pattern, $input, $captures); What if I want $captures as an array, in which all values will be stored which will match with above pattern being in between of this pattern?

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  • What are most demanded web-development languages today for startups?

    - by Liston Catch
    What technologies are in demand nowaydas for web-development for web-startups? For frontend its all clear: HTML5, JS, AJAX, JQuery. But what about backend? What languages (and frameworks) should I consider using? I am not asking "which language is best", I just need a list of modern languages and frameworks (and not Pascal, Delphi or Basic) which are demanded and well-payed. UPD: I totally decline the "it's all about logic, not about language. language is just a tool" concept. While THEORETICALLY it's true, in reality the time you need to study required frameworks is counted by months, so language DOES matter indeed. That's why I made this topic UPD 2: Mason Wheeler, so you seriously advice me to go for Delphi? You think its DEMANDED nowadays? Or you just tell me an exception which only confirms the rule? It's like "one guy won 100,000,000$ in lottery. Just for you to know that lottery is not a bad way to earn money."

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  • Did I choose proper career path? [closed]

    - by Liston Catch
    I am a C# Junior. My company has it's own enterprise documents-flow system written, my job along with 10 other programmers is to write modules/add-ons for it. I am totally bored of this job, I dont like Microsoft's technologies stack (dont hate me here, just subjective), but it's plain boring, enterprise is boring (subjective again, everyone's tastes differ), days on this work last long and I am tired of it. In short - I dont like my job. In my spare time I am doing PHP-development and I totally like it. I am also doing web-design, so I am LAMP-kind of guy who loves his Ubuntu and does design aswell. I know that most programmers don't do design themselves, so some person is either all about design or all about coding, but I enjoy both and do both. I often get interesting sites orders, I love to make whole websites with all the design, I love the feeling of site completeness, I enjoy talking with customers. I like that PHP is simple and skill cap is lower than one of java, meaning I can become expert in it after some years. But C# (and J2EE also) pay more, and I am doing really good in C#. But I dont like it. I can go for J2EE, platform itself seems more fun to me rather than .NET, but EE development is still boring to me. But it seems higher payed, easier to find job (since PHP is too common for its easiness. But if you are expert in something it doesnt matter, right? Just a higher skillcap.) Question: I want to go on with freelance. I want to have an opportunity to start my own startup in web. Actually I have a browser-game already written by myself, it earns me around 500$ per month which I am really proud of since I am 21 only and still noob in coding. I want to find part-time PHP job. 3 days per week so I can get some stable income, I can work in team and learn from them, social factor matters aswell as ensurance and diversity. I also want my total income (freelance + part-time job + own startup maybe)to be not too much less than one I have working in EE development sector. Maximum of 25% lower, but not more. Is it all possible if I stick with web-development (LAMP + HTML/CSS/JS/Jquery/AJAX)? Or is it easier to reach my goals with EE development?

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  • How to setup apache to catch a proxy_pass from nginx?

    - by Paté
    I have a working apache vhost such as <VirtualHost localhost:10006> DocumentRoot "/home/pate/***/git/kohana_site/public/site/" </VirtualHost> <VirtualHost *:10006> ServerName api.* DocumentRoot "/home/pate/***/git/kohana_site/public/api/" LogLevel debug </VirtualHost> If i point to localhost:10006 I get my website and api.localhost:10006 I get my api. Then I have haproxy setup on top of that, that runs on port 10010 and both localhost:10010 and api.localhost:10010 have the expected behaviour. Now I have nginx setup on port 80 with this configuration. server { listen 10000; server_name api.*; location / { proxy_pass http://legacy_server; } } server { listen 10000 default; server_name _; location /nginx_status { stub_status on; access_log off; } # images are accessed via the CDN over HTTP (not https) location /n/image { proxy_pass http://image_caching_server; } location / { return 301 https://$host:10014$request_uri; } } upstream legacy_server { server localhost:10010 fail_timeout=0; } the problem is that apache does not recognize the vhost properly and redirects api.localhost to the website instead of the api. I tried playing with set_proxy_header Host $host but it doesn't seem to do anything.

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  • DFS Replication, Users HOME folder - seems not to catch all files... any hints?

    - by TomTom
    I amm moving stuff out of a file Server. I am using DFS for that - the Folders are anyway in a DFS tree, so I can set up a replication temporarily, then drop the old Folder. Works nice, EXCEPT for the Folder containing the users home drives. Which, incidentally, is also the one I can not see all files in due to my permissions. Small Setup. We have 159mb in the users directories, 1280 files, 133 Folders original. The copy only has 157mb, 1269 files, 133 Folders. Anyone knwos of a way to find out what files are missing? IS this a Problem (could be some Caching files that are regenerated). Users are all offline (weekend) ;) This is pretty much the last share - all others had exactly ZERO issues.

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  • How to setup a fake SMTP server to catch all mails?

    - by Richo
    I'm looking for an smtp service that essentially obeys the RFC, except rather than sending mail it simply logs to a file [date] sent mail to <address> Or whatever. I can bash this together with the bare minimum of functionality I need in python in about half an hour I reckon but if there's an existing project that works better I'd rather use that. The reason for needing it is debugging an app that keeps sending 7* the amount of mail it's supposed to. Slightly offtopic, but if there isn't already such a project, and I write it, is this something other people would use? If I publish the source will it get used? EDIT: And already asked: http://stackoverflow.com/questions/1006650/dummy-smtp-server-for-testing-apps-that-send-email

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  • Is it safe to catch an access violation in this scenario?

    - by Eloff
    I've read a lot, including here on SO that suggests this is a very bad idea in general and that the only thing you can do safely is exit the program. I'm not sure that this is true. This is for a pooling memory allocator that hands off large allocations to malloc. During pool_free() a pointer needs to be checked it it belongs to a pool or was allocated with malloc. By rounding the address down to the nearest 1MB boundary, I get a pointer to the beginning of a block of memory in the pool, or undefined if malloc was used. In the first case I can easily verify that the block of memory belongs to the pool, but, if it does not I will either fail this verification, or I will get an access violation (note that this is a read-only process). Could I not catch this with SEH (Windows) or handle the signal (POSIX) and simply treat it as a failed verification? (i.e. this is only possible if malloc was used, so pass the ptr to free())

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  • How can I catch a "catchable fatal error" on PHP type hinting?

    - by Ho
    Hello, I am trying to implement Type Hinting of PHP5 on one of my class, class ClassA { public function method_a (ClassB $b) {} } class ClassB {} class ClassWrong{} Correct usage: $a = new ClassA; $a->method_a(new ClassB); producing error: $a = new ClassA; $a->method_a(new ClassWrong); Catchable fatal error: Argument 1 passed to ClassA::method_a() must be an instance of ClassB, instance of ClassWrong given... May I know if it is possible to catch that error(since it says "catchable")? and if yes, how? Thank you.

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  • Catch and Show an error from a WCF service call in javascript.

    - by cw
    Hello, I'm calling a WCF service through javascript and right now it's not showing any errors that might occur on the service side to the user. I have the code below and am looking for a better way to inform the user an error has occured, including the call stack and error message if possible. The service itself throws a FaultException if an error has occured. However, I want to catch that error in the javascript call and show it to the user. Here is the js code to call the service function Save() { var saveInfo = $("._saveInfo").val() app.namspace.interfacetoservice.Save( saveInfo, function(results) { if (results == true) { window.close(); } else { alert("error saving"); } } ); } Thanks for the help!

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  • Is it possible to make a video download panel for Chrome ( using NPAPI to catch media stream)

    - by user359278
    Hi guys. I'm trying to make a media Download bar for Chrome Browser like Real Player's one ( a DLL plugin ): Whenever you open a web-page which contents "media stream" like Youtube..., it will show a download bar at the left-top corner of the flash player - allow you to download this video/song to your computer. I know it use NPAPI to catch the media stream but how? Which method do I have to use? Is there any document for me? I have never worked on a NPAPI-project before. Thanks in advance and so sorry for bad English.

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