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Articles indexed Sunday April 11 2010

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  • High quality software examples

    - by Francisco Garcia
    One of the best ways to learn about programming is reading high quality code/projects from great engineers. Which open-source projects do you think is worth looking at? I mean, that code that you can print and sit under a tree with a glass of wine and enjoy reading. If you can, also specify if the software is great to look at because its documentation, design, UML diagrams or just plain code. I believe UML is not very common within open-source projects. Is there such a thing as a project branch that polishes code and design with the sole objective to give other programmers a great example of great software?

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  • Advice on improving programming skills, learning capabilities?

    - by anonymous-coward1234
    Hi all, After 2,5 years of professional Java programing, I still have problems that make my job difficult and, more importantly - more times that I would like to admit - not enjoyable. I would like to ask for advice by more experienced people on ways that would help me overcome them. These are the problems I have: I do not absorb new knowledge easily. Even when I understand something, after a couple of days I easily forget even basic stuff. Other co-workers, even with the same working experience, when reading new technologies put things easily into "context", and are able to compare in "real time| similar technologies they already have used. I always try to address all the issues to whatever I am doing at one go, which results in me trying to resolve too many problems at the same time, losing completely control. I find it difficult to make my mind on a single problem that I should address first, and even when I do, and find myself throwing away code that I wrote because I started addressing the wrong issue first. As far as architecture and data modeling is concerned, I have difficulty making decisions on what objects must be created, with what hierarchy, interfaces, abstraction etc. I imagine that - to a certain degree - these things come with experience. But after 2,5 years of Java programming, I would expect myself to have come much farther that I have come, both in terms of absorption and experience. Is there a way to improve my learning speed? Any books, methods, advice is welcome.

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  • Temporary "Backup" of SharePoint Content During Feature and Solution Deployment

    - by ccomet
    I need to decide on a method for storing a subset of the content in a SharePoint site, so that when I delete and recreate certain lists as part of a feature activation, I can re-insert all of this content back where it should belong. I have an idea myself, but I don't know if it's the only method and more importantly, the right method. My client has me creating a SharePoint system for them to communicate with their clients. The business process has maybe 5 stages in it (maybe it's more, I don't even know because they don't tell me everything), and the current system I've written over the past months is maybe 2 stages through. This meets our deadline of completing those systems by Monday next week... but at that point my client is planning on making the site live from that point. In effect, their work with their clients will be running parallel with my work for them. As I complete my own work on a separate test server, I'll push each following stage of the process onto the live server. Scheduled downtimes during non-business times (like a weekend) will be available for me to perform these pushes. Keeping pace so that my development is faster than the actual business process is my own problem and off-topic... so let's get back to the problem I stated at the start of this post. In this system, we have sets of features which will create lists for their associated content types and field types when activated, and delete these lists when the feature is deactivated. Most updates don't need to deactivate and reactivate these features, such as workflow changes, custom actions, custom forms, and similar ilk. But there are some parts which do require this. On my test server, it's okay for me to obliterate lists, but once the site is live and there's real correspondence data, it's absolutely unacceptable to do this. So when I need to implement a new change in functionality, I need to be able to store the currently present data in several lists, deactivate the feature, reactivate the feature, and restore all of this data. Perhaps I have hoist myself by my own petard with the feature system I implemented. Unfortunately, the necessity to later on make several of these "project sites" meant I had to do a lot of my code with the concept of "Can be deployed repeatedly" in mind. My current plan is to run through lists and libraries which will be affected by the particular feature that is to be reset. Files and all of their versions will be saved in a directory on the server. Then, a set of text files will be used to store all of the important field values for the items. This includes a lot of cross-list reference lookups that will need to be maintained, but that's simple enough. Then, I deactivate the feature, deploy the new solution, and reactivate the feature. We upload all of the files in the order specified by their versions and update them with the stored fields for those versions, so that we retain the version structure. As each one is first uploaded, the new ID is picked out, and all relevant lookups in the rest of the files are updated (in some manner that I make sure I don't re-update it later with an incorrect value, of course). After that, we run through all the rest of the items in the order most conducive to keeping the relational data correct. This roughly summarizes what my current plan is. To my advantage, there are no long running workflows in the system that will be affected by this, so there's nothing I will have to worry about making sure nothing is "still running" when I do this stuff. I don't really know all the cons of this approach... I can imagine they're quite hefty. But I'm unsure what other choices I even have, and my searches haven't turned up anything. Is there anyone who can think of a better idea? Or will anyone just tell me that I really have no other choice? Thanks in advance!

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  • Comparison of free open source ecommerce solutions

    - by nute
    I want to launch a small online shop. I've heard of several open source ecommerce solutions out there. Is there a website, page, or something that could help me choose the right one? I've heard of osCommerce, magento, joomla+ecommerce ... I'm looking for a free solution, preferably in PHP so I can tweak it if needed. Thanks!

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  • Animation effect on C#

    - by Optimizer
    Can someone point me to a C# open source implementaion with a simple image animations. e.g. I feed the input image to animator, and the animation code produces a few dozen of images which if displayed sequentially looks like animation. I am not something extremely fancy - a simple DirectX filter like animations would do. Thank you.

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  • Problem with posting the message using php

    - by Darshana
    Hello, I have successfully come up to the access_token step along with final oauth_token and oauth_token_secret values. Now I'm trying to access the Post method given by Yammer API with following request : https://www.yammer.com/api/v1/messages/? body=MyMessage& oauth_consumer_key=Myconsumerkey& oauth_nonce=1825bbc0f0a2875eb94bdb4d51c0638b& oauth_signature=JzG4DCWxuP%2B7xT7u3tFZ2zCC8%2BI%3D& oauth_signature_method=HMAC-SHA1& oauth_timestamp=1257761059& oauth_token=Myfinaloauthtoken& oauth_version=1.0 But I'm getting "Invalid OAuth signature" error. Can somebody help me in this.

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  • Is there any way to perform pre-/post-switch commands using TortoiseSVN?

    - by Steve
    We need to perform some tasks when switching from one Subversion branch to another using TortoiseSVN. Is there any way to, say, call a batch file before and after the switch? The only thing I can find are pre-/post-update and commit hooks, but none of those get executed when switching between branches. EDIT: I am looking for client-side hooks. TortoiseSVN has client-side hook scripts for pre-/post-update and commit, but nothing (that I can find) for pre-/post-switch. Initially, I thought adding hooks for client-side pre-/post-update would be executed when switching between branches, but this does not seem to be the case.

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  • ajax/jquery disables links after submit

    - by Chocho
    i am working on this form. i am using lightbox and dhtml fade effects. the content in my lightbox is a form. i am using jquery to validate the form. once the form is submitted, i redirect a user back to a thank you page. what i am noticing is that, once all the above events has taken place, i cannot click anywhere on my screen, all the links/buttons are sort of disable. i need to press F5 to refresh the page to be able to click anywhere on the page again? is this happening because i am using jquery validation and an events already took place, how do i resolve this as i am a newbie to jquery. thanks

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  • How do I add values from two separate queries in SQL

    - by fishhead
    Below is my attempt at adding two values from separate select statements...it's not working, and I can't see why. I'm looking for some direction. select (v1.Value + v2.Value) as total from ( (Select Max(Value) as [Value] from History WHERE Datetime>='Apr 11 2010 6:05AM' and Datetime<='Apr 11 2010 6:05PM' and Tagname ='RWQ272017DTD' ) as v1 (Select Max(Value) as [Value] from History WHERE Datetime>='Apr 11 2010 6:05AM' and Datetime<='Apr 11 2010 6:05PM' and Tagname ='RU282001DTD' ) as v2 ) EDIT: Boy do I feel foolish...I asked the same question a few days ago...now I can't delete this.

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  • create app that has plugin which contains PyQt widget

    - by brian
    I'm writing an application that will use plugins. In the plugin I want to include a widget that allows the options for that plugin to be setup. The plugin will also include methods to operate on the data. What is is the best way to include a widget in a plugin? Below is pseudo code for what I've tried to do. My original plan was to make the options widget: class myOptionsWidget(QWidget): “”” create widget for plug in options “”” …. Next I planned on including the widget in my plugin: class myPlugin def __init__(self): self.optionWidget = myOptionsWidget() self.pluginNum = 1 …. def getOptionWidget(self): return(self.optionWidget) Then at the top level I'd do something like a = myPlugin() form = createForm(option=a.getOptionWidget()) … where createForm would create the form and include my plugin options widget. But when I try "a = myPlugin()" I get the error "QWidget: Must construct a QApplication before a QpaintDevice" so this method won't work. I know I would store the widget as a string and call eval on it but I'd rather not do that in case later on I want to convert the program to C++. What is the best way to write a plugin that includes a widget that has the options? Brian

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  • Google Visualization API chart in Blogger / Blogspot

    - by gotgenes
    Is it possible to embed (chart) visualizations created by the Google Visualization API in a Blogger post? I tried stripping out the <head> and <body> tags (and closing tags) from the pie chart example, however, the pie chart visualization fails to render, even on a published post. NOTE: I'm asking about the Visualization API, rather than the Google Image Charts (Charts API).

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  • sampling integers uniformly efficiently in python using numpy/scipy

    - by user248237
    I have a problem where depending on the result of a random coin flip, I have to sample a random starting position from a string. If the sampling of this random position is uniform over the string, I thought of two approaches to do it: one using multinomial from numpy.random, the other using the simple randint function of Python standard lib. I tested this as follows: from numpy import * from numpy.random import multinomial from random import randint import time def use_multinomial(length, num_points): probs = ones(length)/float(length) for n in range(num_points): result = multinomial(1, probs) def use_rand(length, num_points): for n in range(num_points): rand(1, length) def main(): length = 1700 num_points = 50000 t1 = time.time() use_multinomial(length, num_points) t2 = time.time() print "Multinomial took: %s seconds" %(t2 - t1) t1 = time.time() use_rand(length, num_points) t2 = time.time() print "Rand took: %s seconds" %(t2 - t1) if __name__ == '__main__': main() The output is: Multinomial took: 6.58072400093 seconds Rand took: 2.35189199448 seconds it seems like randint is faster, but it still seems very slow to me. Is there a vectorized way to get this to be much faster, using numpy or scipy? thanks.

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  • tic tac toe in pascal --> a problem occurred

    - by Emese
    I don't know why my program doesn't run. I would really appreciate your help. Here's my program: USES graph,crt; type tegla=record x,y:integer; ertek:0..2; end; var gd,gm:integer; i,j:integer; c:char; jatekos:integer; a:array[1..3,1..3]of tegla; lx,ly:integer; procedure tabla; var x,y,i,j:integer; begin lx:=getmaxx div 3; ly:=getmaxy div 3; for i:=1 to 3 do begin y:=(i-1)*ly; for j:=1 to 3 do begin x:=(j-1)*lx; a[i,j].x:=x; a[i,j].y:=y; a[i,j].ertek:=0; setbkcolor(10); setcolor(9); rectangle(a[i,j].x,a[i,j].y,a[i,j].x+lx,a[i,j].y+ly); end; end; end; procedure aktival(i,j:integer); begin setcolor(red); rectangle(a[i,j].x,a[i,j].y,a[i,j].x+lx,a[i,j].y+ly); end; procedure visszaallit(i,j:integer); begin setcolor(9); rectangle(a[i,j].x,a[i,j].y,a[i,j].x+lx,a[i,j].y+ly); end; procedure rajzolx(i,j:integer); begin setcolor(5); line(a[i,j].x,a[i,j].y,a[i,j].x+lx,a[i,j].y+ly); line(a[i,j].x+lx,a[i,j].y,a[i,j].x,a[i,j].y+ly); end; procedure rajzol_0(i,j:integer); begin setcolor(13); circle(a[i,j].x+lx div 2, a[i,j].y+ly div 2, 50); end; procedure kinyer(i,j:integer); begin jatekos:=1; if a[1,1]=a[2,2] and a[3,3]=a[1,1] and a[2,2]=a[3,3] or a[3,1]=a[2,2] and a[1,3]=a[3,1] and a[1,3]=a[2,2] then if jatekos then begin cleardevice; writeln('x nyert!'); end else if jatekos+1 then begin cleardevice; writeln('O nyert!'); end else for i:=1 to 3 do begin if a[i,1]=a[i,2] and a[i,1]=a[i,3] and a[i,2]=a[i,3] or a[1,i]=a[2,i] and a[1,i]=a[3,i] and a[2,i]=a[3,i] then if jatekos then begin cleardevice; writeln('x nyert'); end else if jatekos+1 then begin cleardevice; writeln('O nyert!'); end; end; Begin initgraph(gd,gm,' '); tabla; jatekos:=1; i:=2; j:=2; aktival(i,j); repeat c:=readkey; if ord(c)=0 then begin c:=readkey; case ord(c)of 72: if i>1 then begin visszaallit(i,j); dec(i); aktival(i,j);end; 77:if j<3 then begin visszaallit(i,j); inc(j); aktival(i,j); end; 80:if i<3 then begin visszaallit(i,j); inc(i); aktival(i,j); end; 75:if j>1 then begin visszaallit(i,j); dec(j); aktival(i,j); end; end; end; if ord(c)=13 then begin if a[i,j].ertek=0 then if jatekos=1 then begin rajzolx(i,j); a[i,j].ertek:=1; jatekos:=2; end else begin rajzol_0(i,j); a[i,j].ertek:=2; jatekos:=1; end; end; until ord(c)=27; kinyer(i,j); end; end. I hope you can help me. Thank you a lot!

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  • Caching NHibernate Named Queries

    - by TStewartDev
    I recently started a new job and one of my first tasks was to implement a "popular products" design. The parameters were that it be done with NHibernate and be cached for 24 hours at a time because the query will be pretty taxing and the results do not need to be constantly up to date. This ended up being tougher than it sounds. The database schema meant a minimum of four joins with filtering and ordering criteria. I decided to use a stored procedure rather than letting NHibernate create the SQL for me. Here is a summary of what I learned (even if I didn't ultimately use all of it): You can't, at the time of this writing, use Fluent NHibernate to configure SQL named queries or imports You can return persistent entities from a stored procedure and there are a couple ways to do that You can populate POCOs using the results of a stored procedure, but it isn't quite as obvious You can reuse your named query result mapping other places (avoid duplication) Caching your query results is not at all obvious Testing to see if your cache is working is a pain NHibernate does a lot of things right. Having unified, up-to-date, comprehensive, and easy-to-find documentation is not one of them. By the way, if you're new to this, I'll use the terms "named query" and "stored procedure" (from NHibernate's perspective) fairly interchangeably. Technically, a named query can execute any SQL, not just a stored procedure, and a stored procedure doesn't have to be executed from a named query, but for reusability, it seems to me like the best practice. If you're here, chances are good you're looking for answers to a similar problem. You don't want to read about the path, you just want the result. So, here's how to get this thing going. The Stored Procedure NHibernate has some guidelines when using stored procedures. For Microsoft SQL Server, you have to return a result set. The scalar value that the stored procedure returns is ignored as are any result sets after the first. Other than that, it's nothing special. CREATE PROCEDURE GetPopularProducts @StartDate DATETIME, @MaxResults INT AS BEGIN SELECT [ProductId], [ProductName], [ImageUrl] FROM SomeTableWithJoinsEtc END The Result Class - PopularProduct You have two options to transport your query results to your view (or wherever is the final destination): you can populate an existing mapped entity class in your model, or you can create a new entity class. If you go with the existing model, the advantage is that the query will act as a loader and you'll get full proxied access to the domain model. However, this can be a disadvantage if you require access to the related entities that aren't loaded by your results. For example, my PopularProduct has image references. Unless I tie them into the query (thus making it even more complicated and expensive to run), they'll have to be loaded on access, requiring more trips to the database. Since we're trying to avoid trips to the database by using a second-level cache, we should use the second option, which is to create a separate entity for results. This approach is (I believe) in the spirit of the Command-Query Separation principle, and it allows us to flatten our data and optimize our report-generation process from data source to view. public class PopularProduct { public virtual int ProductId { get; set; } public virtual string ProductName { get; set; } public virtual string ImageUrl { get; set; } } The NHibernate Mappings (hbm) Next up, we need to let NHibernate know about the query and where the results will go. Below is the markup for the PopularProduct class. Notice that I'm using the <resultset> element and that it has a name attribute. The name allows us to drop this into our query map and any others, giving us reusability. Also notice the <import> element which lets NHibernate know about our entity class. <?xml version="1.0" encoding="utf-8" ?> <hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"> <import class="PopularProduct, Infrastructure.NHibernate, Version=1.0.0.0"/> <resultset name="PopularProductResultSet"> <return-scalar column="ProductId" type="System.Int32"/> <return-scalar column="ProductName" type="System.String"/> <return-scalar column="ImageUrl" type="System.String"/> </resultset> </hibernate-mapping>  And now the PopularProductsMap: <?xml version="1.0" encoding="utf-8" ?> <hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"> <sql-query name="GetPopularProducts" resultset-ref="PopularProductResultSet" cacheable="true" cache-mode="normal"> <query-param name="StartDate" type="System.DateTime" /> <query-param name="MaxResults" type="System.Int32" /> exec GetPopularProducts @StartDate = :StartDate, @MaxResults = :MaxResults </sql-query> </hibernate-mapping>  The two most important things to notice here are the resultset-ref attribute, which links in our resultset mapping, and the cacheable attribute. The Query Class – PopularProductsQuery So far, this has been fairly obvious if you're familiar with NHibernate. This next part, maybe not so much. You can implement your query however you want to; for me, I wanted a self-encapsulated Query class, so here's what it looks like: public class PopularProductsQuery : IPopularProductsQuery { private static readonly IResultTransformer ResultTransformer; private readonly ISessionBuilder _sessionBuilder;   static PopularProductsQuery() { ResultTransformer = Transformers.AliasToBean<PopularProduct>(); }   public PopularProductsQuery(ISessionBuilder sessionBuilder) { _sessionBuilder = sessionBuilder; }   public IList<PopularProduct> GetPopularProducts(DateTime startDate, int maxResults) { var session = _sessionBuilder.GetSession(); var popularProducts = session .GetNamedQuery("GetPopularProducts") .SetCacheable(true) .SetCacheRegion("PopularProductsCacheRegion") .SetCacheMode(CacheMode.Normal) .SetReadOnly(true) .SetResultTransformer(ResultTransformer) .SetParameter("StartDate", startDate.Date) .SetParameter("MaxResults", maxResults) .List<PopularProduct>();   return popularProducts; } }  Okay, so let's look at each line of the query execution. The first, GetNamedQuery, matches up with our NHibernate mapping for the sql-query. Next, we set it as cacheable (this is probably redundant since our mapping also specified it, but it can't hurt, right?). Then we set the cache region which we'll get to in the next section. Set the cache mode (optional, I believe), and my cache is read-only, so I set that as well. The result transformer is very important. This tells NHibernate how to transform your query results into a non-persistent entity. You can see I've defined ResultTransformer in the static constructor using the AliasToBean transformer. The name is obviously leftover from Java/Hibernate. Finally, set your parameters and then call a result method which will execute the query. Because this is set to cached, you execute this statement every time you run the query and NHibernate will know based on your parameters whether to use its cached version or a fresh version. The Configuration – hibernate.cfg.xml and Web.config You need to explicitly enable second-level caching in your hibernate configuration: <hibernate-configuration xmlns="urn:nhibernate-configuration-2.2"> <session-factory> [...] <property name="dialect">NHibernate.Dialect.MsSql2005Dialect</property> <property name="cache.provider_class">NHibernate.Caches.SysCache.SysCacheProvider,NHibernate.Caches.SysCache</property> <property name="cache.use_query_cache">true</property> <property name="cache.use_second_level_cache">true</property> [...] </session-factory> </hibernate-configuration> Both properties "use_query_cache" and "use_second_level_cache" are necessary. As this is for a web deployement, we're using SysCache which relies on ASP.NET's caching. Be aware of this if you're not deploying to the web! You'll have to use a different cache provider. We also need to tell our cache provider (in this cache, SysCache) about our caching region: <syscache> <cache region="PopularProductsCacheRegion" expiration="86400" priority="5" /> </syscache> Here I've set the cache to be valid for 24 hours. This XML snippet goes in your Web.config (or in a separate file referenced by Web.config, which helps keep things tidy). The Payoff That should be it! At this point, your queries should run once against the database for a given set of parameters and then use the cache thereafter until it expires. You can, of course, adjust settings to work in your particular environment. Testing Testing your application to ensure it is using the cache is a pain, but if you're like me, you want to know that it's actually working. It's a bit involved, though, so I'll create a separate post for it if comments indicate there is interest.

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  • htaccess rewrite and auth conflict

    - by Michael
    I have 2 directories each with a .htaccess file: html/.htaccess - There is a rewrite in this file to send almost everything to url.php RewriteCond %{REQUEST_URI} !(exported/?|\.(php|gif|jpe?g|png|css|js|pdf|doc|xml|ico))$ RewriteRule (.*)$ /url.php [L] and html/exported/.htaccess AuthType Basic AuthName "exported" AuthUserFile "/home/siteuser/.htpasswd" require valid-user If I remove html/exported/.htaccess the rewriting works fine and the exported directory can be access. If I remove html/.htaccess the authentication works fine. However when I have both .htaccess files exported/ is being rewritten to /url.php. Any ideas how I can prevent it?

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  • Windows Server Shares web interface?

    - by Lazlow
    At work and home, I use Server 2003 with Windows Shares. We also have a couple of Netgear ReadyNAS appliances at work, managed via the web interface. Is there a built-in Web Interface for managing Shares, or a free one available - for use in Server 2003 (or 2008)? The reason I ask is that it would be good to manage the Shares via the Web, rather then RDP onto the Server each time - and would allow other users to treat it as a NAS.

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  • Getting Wireless working on Dell Inspiron 1545 in Ubuntu 10.04?

    - by Dexter
    I'm trying to install my wireless drivers (which uses a broadcom card). I tried to install them using the restricted drivers offered on my Ubuntu CD. However when I clicked activate it got about halfway through the install process before it gave me this error message: SystemError: installArchives() failed How can I correct this?

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