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  • How to allow users to define financial formulas in a C# app

    - by Peter Morris
    I need to allow my users to be able to define formulas which will calculate values based on data. For example //Example 1 return GetMonetaryAmountFromDatabase("Amount due") * 1.2; //Example 2 return GetMonetaryAmountFromDatabase("Amount due") * GetFactorFromDatabase("Discount"); I will need to allow / * + - operations, also to assign local variables and execute IF statements, like so var amountDue = GetMonetaryAmountFromDatabase("Amount due"); if (amountDue > 100000) return amountDue * 0.75; if (amountDue > 50000) return amountDue * 0.9; return amountDue; The scenario is complicated because I have the following structure.. Customer (a few hundred) Configuration (about 10 per customer) Item (about 10,000 per customer configuration) So I will perform a 3 level loop. At each "Configuration" level I will start a DB transaction and compile the forumlas, each "Item" will use the same transaction + compiled formulas (there are about 20 formulas per configuration, each item will use all of them). This further complicates things because I can't just use the compiler services as it would result in continued memory usage growth. I can't use a new AppDomain per each "Configuration" loop level because some of the references I need to pass cannot be marshalled. Any suggestions?

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  • Axis2 Webservice -> php

    - by Peter Hagström
    Hi! If I have understood Axis2 correct i can construct a WebService and then access it with any SOAP compatible client. I have a java class with a couple of methods that I have written in Eclipse, and then automatically constructed a service with the Axis2 plugin from WTP. This is the methods of my class. public int test(int i){ return i+2; } public Car CarTest(int speed){ return new Car("Biltest", speed); } public CarFactoryAdapter getCarFactory(){ carFact.getCars().add(new Car("Bmw", 250)); carFact.getCars().add(new Car("seat", 350)); carFact.getCars().add(new Car("saab", 150)); carFact.getCars().add(new Car("volv", 50)); return new CarFactoryAdapter(carFact); } The code seems to work when I try it with soapUI and the Axis2-web interface has recognized the methods of my service. But when Iam trying the methods that receives parameters with PHP´s built in soapClient i get a Unknown exception. The getCarFactory methods works at least as expected, but it seems kind of crippled if I can´t send parameters. Example of non working method invocation. ini_set('soap.wsdl_cache_ttl',0); $client = new SoapClient("http://192.168.128.162:8080/ComplexWebService/services/CarService?wsdl", array('soap_version' => SOAP_1_2, 'trace' => 1)); $ar['i'] = (int)100; print_r($client->__soapCall("test",$ar)); I need to make sure that the SOA framework i choose will be able to comunicate with many platforms, there will be clients in at least PHP and Java, but it would be good if it will work in for example .NET to.

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  • Whats wrong with this task queue setup?

    - by Peter Farmer
    I've setup this task queue implementation on a site I host for a customer, it has a cron job which runs each morning at 2am "/admin/tasks/queue", this queues up emails to be sent out, "/admin/tasks/email", and uses cursors so as to do the queuing in small chunks. For some reason last night /admin/tasks/queue kept getting run by this code and so sent out my whole quota of emails :/. Have I done something wrong with this code? class QueueUpEmail(webapp.RequestHandler): def post(self): subscribers = Subscriber.all() subscribers.filter("verified =", True) last_cursor = memcache.get('daily_email_cursor') if last_cursor: subscribers.with_cursor(last_cursor) subs = subscribers.fetch(10) logging.debug("POST - subs count = %i" % len(subs)) if len(subs) < 10: logging.debug("POST - Less than 10 subscribers in subs") # Subscribers left is less than 10, don't reschedule the task for sub in subs: task = taskqueue.Task(url='/admin/tasks/email', params={'email': sub.emailaddress, 'day': sub.day_no}) task.add("email") memcache.delete('daily_email_cursor') else: logging.debug("POST - Greater than 10 subscibers left in subs - reschedule") # Subscribers is 10 or greater, reschedule for sub in subs: task = taskqueue.Task(url='/admin/tasks/email', params={'email': sub.emailaddress, 'day': sub.day_no}) task.add("email") cursor = subscribers.cursor() memcache.set('daily_email_cursor', cursor) task = taskqueue.Task(url="/admin/tasks/queue", params={}) task.add("queueup")

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  • How to import data in SQL Compact Edition?

    - by Peter
    I don't seem to find a tool for it, nor an odbc driver. Thanks UPDATE : I'm aware of the sql scripting possibilities. But than again : how to script a sql 2k table? (not just ddl, but data also?) Of course you can write this all by yourself, but importing data into CE cannot be such a hassle, or can it ? UPDATE2 : I don't seem to be able to choose the right dialect for inserting

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  • What is the C# equivalent of java.util.regex?

    - by peter.murray.rust
    I am converting Java code to C# and need to replace the use of Java's regex. A typical use is import java.util.regex.Matcher; import java.util.regex.Pattern; //... String myString = "B12"; Pattern pattern = Pattern.compile("[A-Za-z](\\d+)"); Matcher matcher = Pattern.matcher(myString); String serial = (matcher.matches()) ? matcher.group(1) : null; which should extract a capture group from a matched target string. I'd be grateful for simple examples. EDIT: I have now added the C# equivalent of the code as an answer. EDIT: Here is a tutorial on the use of the actual expressions. EDIT: Here is a useful comparison of C# and Java (and Perl.)

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  • How should I use random.jumpahead in Python

    - by Peter Smit
    I have a application that does a certain experiment 1000 times (multi-threaded, so that multiple experiments are done at the same time). Every experiment needs appr. 50.000 random.random() calls. What is the best approach to get this really random. I could copy a random object to every experiment and do than a jumpahead of 50.000 * expid. The documentation suggests that jumpahead(1) already scrambles the state, but is that really true? Or is there another way to do this in 'the best way'? (No, the random numbers are not used for security, but for a metropolis hasting algorithm. The only requirement is that the experiments are independent, not whether the random sequence is somehow predictable or so)

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  • Output a NULL cell value in Excel

    - by Peter
    I have an IF statement. If a cell = n, then do something, else output NULL =IF(A1=5, "Success", NULL) // #NAME? =IF(A1=5, "Success", "NULL") // NULL (as in text, not actually NULL!) =IF(A1=5, "Success", "") // blank but not NULL =IF(A1=5, "Success", 0) // zero value but not NULL

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  • Ruby Multithreading: making one thread wait for a signal from another

    - by Peter
    In Ruby, I want to have two threads running at the same time, and want the background thread to periodically signal the foreground thread. How do I get the foreground thread to block until the background thread says 'go'? I can think of a few ways to do it, but am after the most appropriate, idiomatic Ruby method. In code: loop do # background, thread 1 sleep 3 receive_input # tell foreground input is ready # <-- how do I do this? end and loop do # foreground, thread 2 wait_for_signal_from_background # <-- how do I do this? do_something end

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  • Difference between piping a file to sh and calling a shell file

    - by Peter Coulton
    This is what was trying to do: $ wget -qO- www.example.com/script.sh | sh which quietly downloads the script and prints it to stdout which is then piped to sh. This unfortunately doesn't quite work, failing to wait for user input a various points, aswell as a few syntax errors. This is what actually works: $ wget -qOscript www.example.com/script.sh && chmod +x ./script && ./script But what's the difference? I'm thinking maybe piping the file doesn't execute the file, but rather executes each line individually, but I'm new to this kind of thing so I don't know.

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  • drupal's hook_preprocess_page not working as expected

    - by Peter Carrero
    i am having an issue where hook_preprocess_page 's changes to &$variables is not being rendered, even though it is the last item under $theme_registry['page']['preprocess functions']. logging contents of $variables to a file show the contents changed, but contents appear unchanged on the site. flushed all cache on drupal, flushed all browser caches and still the same result. /** * Implementation of hook_preprocess_page(). */ function grinchlist_preprocess_page(&$variables) { if (grinchlist_usercheck($variables['user']['uid'])) { $variables['scripts'] = preg_replace('/<script[^>]*christmas_snow.*<\/script>/','',$variables['scripts']); } file_put_contents('/tmp/vars.txt',print_r($variables,true)); } the /tmp/vars.txt shows the variables properly, but the browser still show the script being loaded. this may be a silly example, but i've had this issue with the hook_preprocess_page in other instances and it would really help out to understand what is going on here... thanks.

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  • Extracting Certain XML Elements with PHP SimpleXML

    - by Peter
    I am having some problems parsing this piece of XML using SimpleXML. There is always only one Series element, and a variable number of Episode elements beneath. I want to parse XML so I can store the Series data in one table, and all the Episode data in another table. XML: <Data> <Series> <id>80348</id> <Genre>|Action and Adventure|Comedy|Drama|</Genre> <IMDB_ID>tt0934814</IMDB_ID> <SeriesID>68724</SeriesID> <SeriesName>Chuck</SeriesName> <banner>graphical/80348-g.jpg</banner> </Series> <Episode> <id>935481</id> <Director>Robert Duncan McNeill</Director> <EpisodeName>Chuck Versus the Third Dimension 2D</EpisodeName> <EpisodeNumber>1</EpisodeNumber> <seasonid>27984</seasonid> <seriesid>80348</seriesid> </Episode> <Episode> <id>935483</id> <Director>Robert Duncan McNeill</Director> <EpisodeName>Buy More #15: Employee Health</EpisodeName> <EpisodeNumber>2</EpisodeNumber> <seasonid>27984</seasonid> <seriesid>80348</seriesid> </Episode> </Data> When I attempt to access just the first Series element and child nodes, or iterate through the Episode elements only it does not work. I have also tried to use DOMDocument with SimpleXML, but could not get that to work at all. PHP Code: <?php if(file_exists('en.xml')) { $data = simplexml_load_file('en.xml'); foreach($data as $series) { echo 'id: <br />' . $series->id; echo 'imdb: <br />' . $series->IMDB_ID; } } ?> Output: id:80348 imdb:tt0934814 id:935481 imdb: id:1534641 imdb: Any help would be greatly appreciated.

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  • Last words of a ??? programmer

    - by Peter
    What will the last words of some kind of programmer be? Like: LW of a Perl programmer: I don't have to write documentation. The source is formatted so well, I can read it anytime later... or Im just going to write a regular expression to find this, then I'm done...

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  • 0xDEADBEEF equivalent for 64-bit development?

    - by Peter Mortensen
    For C++ development for 32-bit systems (be it Linux, Mac OS or Windows, PowerPC or x86) I have initialised pointers that would otherwise be undefined (e.g. they can not immediately get a proper value) like so: int *pInt = reinterpret_cast<int *>(0xDEADBEEF); (To save typing and being DRY the right-hand side would normally be in a constant, e.g. BAD_PTR.) If pInt is dereferenced before it gets a proper value then it will crash immediately on most systems (instead of crashing much later when some memory is overwritten or going into a very long loop). Of course the behavior is dependent on the underlying hardware (getting a 4 byte integer from the odd address 0xDEADBEEF from a user process may be perfectly valid), but the crashing has been 100% reliable for all the systems I have developed for so far (Mac OS 68xxx, Mac OS PowerPC, Linux Redhat Pentium, Windows GUI Pentium, Windows console Pentium). For instance on PowerPC it is illegal (bus fault) to fetch a 4 byte integer from an odd address. What is a good value for this on 64-bit systems?

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  • Which SHA-256 is correct? The Java SHA-256 digest or the Linux commandline tool

    - by Peter Tillemans
    When I calculate in Java an SHA-256 of a string with the following method I get : 5e884898da2847151d0e56f8dc6292773603dd6aabbdd62a11ef721d1542d8 on the commandline I do : echo "password" | sha256sum and get 5e884898da28047151d0e56f8dc6292773603d0d6aabbdd62a11ef721d1542d8 if we compare these more closely I find 2 subtle differences 5e884898da2847151d0e56f8dc6292773603dd6aabbdd62a11ef721d1542d8 5e884898da28047151d0e56f8dc6292773603d0d6aabbdd62a11ef721d1542d8 or : 5e884898da28 47151d0e56f8dc6292773603d d6aabbdd62a11ef721d1542d8 5e884898da28 0 47151d0e56f8dc6292773603d 0 d6aabbdd62a11ef721d1542d8 Which of the 2 is correct here?

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  • Mysql adapter for Zend_Translate

    - by Peter
    Hi everybody, I'm currently in the planning phase of a rather large project that I'll develop in the Zend Framework. One of the problems I'm facing is that the customers will want to translate not only the content but also the interface. I'm currently using gettext and poedit to manage my language files but this is not an option for the customer as they, for one, want have FTP access to the site. Hence, I'm thinking of a mysql back end with an interface in the front end for the customer to manage his own translations of the interface. There is however still no mysql adapater for Zend_Translate. So, does anybody now of an adapter script for Zend_Translate so it can work with a mysql table? Or any arguments against using mysql and possible other solutions for this problem?

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  • How can web form content be preserved for the back button

    - by Peter Howe
    When a web form is submitted and takes the user to another page, it is quite often the case that the user will click the Back button in order to submit the form again (the form is an advanced search in my case.) How can I reliably preserve the form options selected by the user when they click Back (so they don't have to start from scratch with filling the form in again if they are only changing one of many form elements?) Do I have to go down the route of storing the form options in session data (cookies or server-side) or is there a way to get the browser to handle this for me? (Environment is PHP/JavaScript - and the site must work on IE6+ and Firefox2+)

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  • Ordering the calling of asynchronous methods in c#

    - by Peter Kelly
    Hi, Say I have 4 classes ControllerClass MethodClass1 MethodClass2 MethodClass3 and each MethodClass has an asynchronous method DoStuff() and each has a CompletedEvent. The ControllerClass is responsible for invoking the 3 asynchronous methods on the 3 MethodClasses in a particular order. So ControllerClass invokes MethodClass1.DoStuff() and subscribes to MethodClass1.CompletedEvent. When that event is fired, ControllerClass invokes MethodClass2.DoStuff() and subscribes to MethodClass2.CompletedEvent. When that event is fired, the ControllerClass invokes MethodClass3.DoStuff() Is there a best practice for a situation like this? Is this bad design? I believe it is because I am finding it hard to unit test (a sure sign) It is not easy to change the order I have an uneasy, code-smell feeling about it What are the alternatives in a situation like this?

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  • How to Store State in Silverlight WCF RIA Services

    - by peter
    Hi All, I am developing a silverlight 3 application using WCF RIA services. I am using the AuthenticationBase class to handle my authentication. As I understand it under the hood this uses the ASP .NET authentication libraries. When I log into the site the authentication service handles login state so that if I close the site and open it straight away I am still logged in according to the server. When the webpage is refreshed or closed and reloaded I can call the method, WebContextBase.Current.Authentication.LoadUser() And it goes back to the authentication service (running on the server) and figures out whether I am still logged into the site. If a timeout has occured the answer will be no. If that is the case I can show a login dialog. The problem I want to solve is that the authentication service consumes the password, and there is no way I can ever retrieve that password again. If the user logs into the site I want to store the password on the server, and return a token to the client side to match up with that password. I have some other services on the server side that need that password. So where should I store that password on the server? How can that be done? How does the WCF authentication store state?

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  • Could you please provide me with comments on a Java game of mine?

    - by Peter Perhác
    Hello there. I have marked this question as community wiki, so no rep points are thrown around. I made this game, Forest Defender, a proof-of-feasibility little project, which I would like to share with you and collect your constructive comments, first impressions, etc. It is a the first playable (and enjoyable) game I have released to the public, so I am, naturally, very eager to get some recognition by you, as my peers. I read in a StackOverflow blog, that One of the major reasons we created Stack Overflow to give every programmer a chance to be recognized by their peers. Recognized for their knowledge, their passion, [...] It comes in the form of a Java applet, I used an animation framework called PulpCore and I must say that it's been extremely enjoyable to work with it. I do recommend to people interested in Java game development. Since the product is free, fun, entirely commercial-free and I am willing to share the code to it (on request), I thought it would be OK to post this as a topic here. Moderators, please feel free to move this to another place if you deem the other place more appropriate. EDIT: I am ever so stupid to forget to include a link :-) http://www.perhac.com/shared/forest-defender/index.html

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