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• In Ruby, how to implement global behaviour?

  - by Gordon McAllister

  Hi all, I want to implement the concept of a Workspace. This is a global concept - all other code will interact with one instance of this Workspace. The Workspace will be responsible for maintaining the current system state (i.e. interacting with the system model, persisting the system state etc) So what's the best design strategy for my Workspace, bearing in mind this will have to be testable (using RSpec now, but happy to look at alternatives). Having read thru some open source projects out there and I've seen 3 strategies. None of which I can identify as "the best practice". They are: Include the singleton class. But how testable is this? Will the global state of Workspace change between tests? Implemented all behaviour as class methods. Again how do you test this? Implemented all behaviour as module methods. Not sure about this one at all! Which is best? Or is there another way? Thanks, Gordon

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• Efficient alternative to merge() when building dataframe from json files with R?

  - by Bryan

  I have written the following code which works, but is painfully slow once I start executing it over thousands of records: require("RJSONIO") people_data <- data.frame(person_id=numeric(0)) json_data <- fromJSON(json_file) n_people <- length(json_data) for(lender in 1:n_people) { person_dataframe <- as.data.frame(t(unlist(json_data[[person]]))) people_data <- merge(people_data, person_dataframe, all=TRUE) } output_file <- paste("people_data",".csv") write.csv(people_data, file=output_file) I am attempting to build a unified data table from a series of json-formated files. The fromJSON() function reads in the data as lists of lists. Each element of the list is a person, which then contains a list of the attributes for that person. For example: [[1]] person_id name gender hair_color [[2]] person_id name location gender height [[...]] structure(list(person_id = "Amy123", name = "Amy", gender = "F", hair_color = "brown"), .Names = c("person_id", "name", "gender", "hair_color")) structure(list(person_id = "matt53", name = "Matt", location = structure(c(47231, "IN"), .Names = c("zip_code", "state")), gender = "M", height = 172), .Names = c("person_id", "name", "location", "gender", "height")) The end result of the code above is matrix where the columns are every person-attribute that appears in the structure above, and the rows are the relevant values for each person. As you can see though, some data is missing for some of the people, so I need to ensure those show up as NA and make sure things end up in the right columns. Further, location itself is a vector with two components: state and zip_code, meaning it needs to be flattened to location.state and location.zip_code before it can be merged with another person record; this is what I use unlist() for. I then keep the running master table in people_data. The above code works, but do you know of a more efficient way to accomplish what I'm trying to do? It appears the merge() is slowing this to a crawl... I have hundreds of files with hundreds of people in each file. Thanks! Bryan

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• asynchronous pages

  - by lockedscope

  I have just read the multi-threading and custom threading in asp.net articles. http://www.williablog.net/williablog/post/2008/12/16/Custom-Threading-in-ASPNET.aspx http://www.williablog.net/williablog/post/2008/12/16/Multi-Threading-in-ASPNET.aspx I have couple of questions. What does he mean by returning a thread to the pool? Is that thread completely removed from memory or put in to a state that it does not scheduled to CPU(is it in sleep state or whatever)? If that thread is removed from memory how could it survive after async point? How this mechanism works? Are every objects(pages class, request,response etc.) are copied to somewhere else before they are disposed? (Or, is it just waiting in a sleep state and then its waked when async call ends?) He is saying that; "Having said that, making pages asynchronous is not really about improving performance, it is about improving scalability" then he is saying; "I'm sorry to say that it will do nothing for scalability or performance." So which one is true? or for which case(s) are they true?

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• Asp.net Crawler Webresponse Operation Timed out.

  - by Leon

  Hi I have built a simple threadpool based web crawler within my web application. Its job is to crawl its own application space and build a Lucene index of every valid web page and their meta content. Here's the problem. When I run the crawler from a debug server instance of Visual Studio Express, and provide the starting instance as the IIS url, it works fine. However, when I do not provide the IIS instance and it takes its own url to start the crawl process(ie. crawling its own domain space), I get hit by operation timed out exception on the Webresponse statement. Could someone please guide me into what I should or should not be doing here? Here is my code for fetching the page. It is executed in the multithreaded environment. private static string GetWebText(string url) { string htmlText = ""; HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url); request.UserAgent = "My Crawler"; using (WebResponse response = request.GetResponse()) { using (Stream stream = response.GetResponseStream()) { using (StreamReader reader = new StreamReader(stream)) { htmlText = reader.ReadToEnd(); } } } return htmlText; } And the following is my stacktrace: at System.Net.HttpWebRequest.GetResponse() at CSharpCrawler.Crawler.GetWebText(String url) in c:\myAppDev\myApp\site\App_Code\CrawlerLibs\Crawler.cs:line 366 at CSharpCrawler.Crawler.CrawlPage(String url, List1 threadCityList) in c:\myAppDev\myApp\site\App_Code\CrawlerLibs\Crawler.cs:line 105 at CSharpCrawler.Crawler.CrawlSiteBuildIndex(String hostUrl, String urlToBeginSearchFrom, List1 threadCityList) in c:\myAppDev\myApp\site\App_Code\CrawlerLibs\Crawler.cs:line 89 at crawler_Default.threadedCrawlSiteBuildIndex(Object threadedCrawlerObj) in c:\myAppDev\myApp\site\crawler\Default.aspx.cs:line 108 at System.Threading.QueueUserWorkItemCallback.WaitCallback_Context(Object state) at System.Threading.ExecutionContext.runTryCode(Object userData) at System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData) at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx) at System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem() at System.Threading.ThreadPoolWorkQueue.Dispatch() at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback() Thanks and cheers, Leon.

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• In ParallelPython, a method of an object ( object.func() ) fails to manipulate a variable of an object ( object.value )

  - by mehmet.ali.anil

  With parallelpython, I am trying to convert my old serial code to parallel, which heavily relies on objects that have methods that change that object's variables. A stripped example in which I omit the syntax in favor of simplicity: class Network: self.adjacency_matrix = [ ... ] self.state = [ ... ] self.equilibria = [ ... ] ... def populate_equilibria(self): # this function takes every possible value that self.state can be in # runs the boolean dynamical system # and writes an integer within self.equilibria for each self.state # doesn't return anything I call this method as: Code: j1 = jobserver.submit(net2.populate_equilibria,(),(),("numpy as num")) The job is sumbitted, and I know that a long computation takes place, so I speculate that my code is ran. The problem is, i am new to parallelpython , I was expecting that, when the method is called, the variable net2.equilibria would be written accordingly, and I would get a revised object (net2) . That is how my code works, independent objects with methods that act upon the object's variables. Rather, though the computation is apparent, and reasonably timed, the variable net2.equilibria remains unchanged. As if PP only takes the function and the object, computes it elsewhere, but never returns the object, so I am left with the old one. What do I miss? Thanks in advance.

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• PF, load balanced gateways, and Squid

  - by Santa

  Hi, So I have a FreeBSD router running PF and Squid, and it has three network interfaces: two connected to upstream providers (em0 and em1 respectively), and one for LAN (re0) that we serve. There is some load balancing configured with PF. Basically, it routes all traffic to ports 1-1024 through one interface (em0) and everything else through the other (em1). Now, I have a Squid proxy also running on the box that transparently redirects any HTTP request from LAN to port 3128 in 127.0.0.1. Since Squid redirects this request to HTTP outside, it should follow the load balancing rule through em0, no? The problem is, when we tested it out (by browsing from a computer in the LAN to http://whatismyip.com, it reports the external IP of the em1 interface! When we turn Squid off, the external IP of em0 is reported, as expected. How do I make Squid behave with the load balancing rule that we have set up? Here's the related settings in /etc/pf.conf that I have: ext_if1="em1" # DSL ext_if2="em0" # T1 int_if="re0" ext_gw1="x.x.x.1" ext_gw2="y.y.y.1" int_addr="10.0.0.1" int_net="10.0.0.0/16" dsl_ports = "1024:65535" t1_ports = "1:1023" ... squid=3128 rdr on $int_if inet proto tcp from $int_net \ to any port 80 -> 127.0.0.1 port $squid pass in quick on $int_if route-to lo0 inet proto tcp \ from $int_net to 127.0.0.1 port $squid keep state ... # load balancing pass in on $int_if route-to ($ext_if1 $ext_gw1) \ proto tcp from $int_net to any port $dsl_ports keep state pass in on $int_if route-to ($ext_if1 $ext_gw1) \ proto udp from $int_net to any port $dsl_ports pass in on $int_if route-to ($ext_if2 $ext_gw2) \ proto tcp from $int_net to any port $t1_ports keep state pass in on $int_if route-to ($ext_if2 $ext_gw2) \ proto udp from $int_net to any port $t1_ports Thanks!

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• Warning: passing Argument 1 of "sqlite3_bind_text" from incompatible pointer type" What should I do

  - by Amarpreet

  Hi All, i am pretty new in iphone development. I have created one function to insert data into database. The code compiles successfully. But when comes to statement sqlite3_bind_text(sqlStatement, 1, [s UTF8String], -1, SQLITE_TRANSIENT); it does not do anything but hangs AND in warning it says "passing Argument 1 of "sqlite3_bind_text" from incompatible pointer type"" for all statements in Red colour The same code i am using to fetch the data from database and its working on other viewController. Below in the code. Its pretty straightforward. Please help guys. -(void) SaveData: (NSString *)FirstName: (NSString *)LastName: (NSString *)State: (NSString *)Street: (NSString *)PostCode { databaseName = @"Zen.sqlite"; NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDire ctory, NSUserDomainMask,YES); NSString *documentsDir=[documentPaths objectAtIndex:0]; databasePath=[documentsDir stringByAppendingPathComponent:databaseName]; sqlite3 *database; if(sqlite3_open([databasePath UTF8String], &database) == SQLITE_OK) { const char *sqlStatement = "insert into customers (FirstName, LastName, State, Street, PostCode) values(?, ?, ?, ?, ?)"; sqlite3_stmt *compiledStatement; sqlite3_prepare_v2(database, sqlStatement, -1, &compiledStatement, NULL); sqlite3_bind_text(sqlStatement, 1, [FirstName UTF8String], -1, SQLITE_TRANSIENT); sqlite3_bind_text(sqlStatement,2,[LastName UTF8String],-1,SQLITE_TRANSIENT); sqlite3_bind_text(sqlStatement,3,[State UTF8String],-1,SQLITE_TRANSIENT); sqlite3_bind_text(sqlStatement,4,[Street UTF8String],-1,SQLITE_TRANSIENT); sqlite3_bind_text(sqlStatement,5,[PostCode UTF8String],-1,SQLITE_TRANSIENT); sqlite3_step(sqlStatement); sqlite3_finalize(compiledStatement); } sqlite3_close(database); }

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• Python: Networked IDLE/Redo IDLE front-end while using the same back-end?

  - by Rosarch

  Is there any existing web app that lets multiple users work with an interactive IDLE type session at once? Something like: IDLE 2.6.4 Morgan: >>> letters = list("abcdefg") Morgan: >>> # now, how would you iterate over letters? Jack: >>> for char in letters: print "char %s" % char char a char b char c char d char e char f char g Morgan: >>> # nice nice If not, I would like to create one. Is there some module I can use that simulates an interactive session? I'd want an interface like this: def class InteractiveSession(): ''' An interactive Python session ''' def putLine(line): ''' Evaluates line ''' pass def outputLines(): ''' A list of all lines that have been output by the session ''' pass def currentVars(): ''' A dictionary of currently defined variables and their values ''' pass (Although that last function would be more of an extra feature.) To formulate my problem another way: I'd like to create a new front end for IDLE. How can I do this? UPDATE: Or maybe I can simulate IDLE through eval()? UPDATE 2: What if I did something like this: I already have a simple GAE Python chat app set up, that allows users to sign in, make chat rooms, and chat with each other. Instead of just saving incoming messages to the datastore, I could do something like this: def putLine(line, user, chat_room): ''' Evaluates line for the session used by chat_room ''' # get the interactive session for this chat room curr_vars = InteractiveSession.objects.where("chatRoom = %s" % chat_room).get() result = eval(prepared_line, curr_vars.state, {}) curr_vars.state = curr_globals curr_vars.lines.append((user, line)) if result: curr_vars.lines.append(('SELF', result.__str__())) curr_vars.put() The InteractiveSession model: def class InteractiveSession(db.Model): # a dictionary mapping variables to values # it looks like GAE doesn't actually have a dictionary field, so what would be best to use here? state = db.DictionaryProperty() # a transcript of the session # # a list of tuples of the form (user, line_entered) # # looks something like: # # [('Morgan', '# hello'), # ('Jack', 'x = []'), # ('Morgan', 'x.append(1)'), # ('Jack', 'x'), # ('SELF', '[1]')] lines = db.ListProperty() Could this work, or am I way off/this approach is infeasible/I'm duplicating work when I should use something already built?

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• Can't access CodeBase from a dynamically generated assembly.

  - by Michael Meadows

  I'm trying to create an assembly dynamically in .Net. I can't seem to figure out how to get the CodeBase property to return a value, however. Here's an example: var assemblyName = new AssemblyName { Name = "Whatever", CodeBase = Directory.GetCurrentDirectory() }; var assemblyBuilder = AppDomain.CurrentDomain .DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.RunAndSave); var moduleBuilder = assemblyBuilder.DefineDynamicModule("WhateverModule", "Whatever.dll"); var typeBuilder = moduleBuilder.DefineType("WhateverType", TypeAttributes.Public); var type = typeBuilder.CreateType(); assemblyBuilder.Save("Whatever.dll"); var codeBase = type.Assembly.CodeBase; // throws the below exception System.NotSupportedException was unhandled Message=The invoked member is not supported in a dynamic assembly. Source=mscorlib StackTrace: at System.Reflection.Emit.InternalAssemblyBuilder.get_CodeBase() at Stupid.Program.Main(String[] args) in C:\Users\Walking Disaster\Documents\Visual Studio 10\Projects\Lingual.Proxy\Stupid\Program.cs:line 25 at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args) at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args) at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly() at System.Threading.ThreadHelper.ThreadStart_Context(Object state) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Threading.ThreadHelper.ThreadStart() Can anyone see what I'm doing wrong?

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• Problem with EDM in ASP.NET MVC

  - by Mannsi

  Hello, I have a question that is pretty similar to this question: http://stackoverflow.com/questions/899734/strongly-typed-asp-net-mvc-with-entity-framework but the solutions for that question don't work for me. Let me start by saying that I don't know a great deal about the subject I am asking about. I have the following code [AcceptVerbs(HttpVerbs.Post)] public ActionResult Edit(PaymentInformation paymentInformationToEdit, int pensionFundID) { var originalPaymentInformation = (from PIs in _db.PaymentInformation where PIs.employeeNumber == paymentInformation.employeeNumber select PIs).First(); var laborUnion = (from LUs in _db.LaborUnion where LUs.laborUnionID = laborUnionID select LUs)First(); paymentInformationToEdit.laborUnion = laborUnion; _db.ApplyProperyChanges(originalPaymentInformation.EntityKey.EntitySetName, paymentInformationToEdit); _db.SaveChanges(); } I get an error when I try for the ApplyProperyChanges saying 'The existing object in the ObjectContext is in the Added state. Changes can only be applied when the existing object is in an unchanged or modified state'. I don't know how to change the state to either, or even if I am doing something fundamentally wrong. Please advice. EDIT: I hope this is the way to go here on stackoverflow. I haven't gotten an answer that solved my problem but Gregoire below posted a possible solution that I didn't understand. I hope this edit bumps my question so somebody will see it and help me. Sorry if this is not the way to go.

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• Correct way to trigger object clone/memento when property changes

  - by Jay

  Hi, I have a big doubt about the correct way to save an object state (clone object), if necessary to rollback the changes, when a property has changed. I know that the IEditableObject interface exists for those cases but during some tests the BeginEdit would just fire like crazy (I have a DataGrid whose values can be edited but I won't need to keep the state of the object in these cases). I'm following the MVP design pattern in my project and the view's DataContext is a wrapper of my presenter.Let's say I have a CheckBox/TextBox in my UI and when that textbox's value changes, the property bound in the wrapper gets set.Currently, before setting the new value i'm raising an event to the presenter (something like PropertyChanging) that clones my wrapper. I'm doing this because I don't think that job should be done by the wrapper itself but by the presenter.Is this a correct approach? Raising the event is an acceptable solution? I thought of other possible ideas: Interface between presenter and wrapper; Use explicit binding and trigger the binding after saving object's state; What is your opinion about the best way to do this? Should I just keep IEditableObject, is this the best way? Best Regards

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• AJAX CascadingDropDown ViewState Problem

  - by Steven

  Question: How do I maintain both the contents (from queries) and selected value of both dropdowns after postback? Source Code: Download my source code from this link (link now works). Just add a reference to your AjaxControlToolkit User Action: Select a value from each dropdown. Click Submit. After Postback: StatesDrop: (Selected value), CitiesDrop "Select a City" Before and after: I believe that when the first dropdown gets its selected value, the second dropdown refreshes and therefore loses its selected value. C# answers also welcome. Default.aspx Active States<br /><asp:DropDownList ID="StatesDrop" runat="server" /><br /> Active Cities<br /><asp:DropDownList ID="CitiesDrop" runat="server" /><br /> <ajax:CascadingDropDown ID="StatesCasc" TargetControlID="StatesDrop" ServicePath="WebService1.asmx" ServiceMethod="GetActiveStates" Category="States" runat="server" PromptText="Select a State" PromptValue="?" /> <ajax:CascadingDropDown ID="CitiesCasc" TargetControlID="CitiesDrop" ServicePath="WebService1.asmx" ServiceMethod="GetActiveCities" Category="Cities" runat="server" ParentControlID="StatesDrop" PromptText="Select a City" PromptValue="?" /> WebService1.asmx.vb Imports System.Web.Services Imports System.Web.Services.Protocols Imports System.ComponentModel Imports System.Web.Script.Services Imports AjaxControlToolkit <System.Web.Script.Services.ScriptService()> _ <System.Web.Services.WebService(Namespace:="http://tempuri.org/")> _ <System.Web.Services.WebServiceBinding _ (ConformsTo:=WsiProfiles.BasicProfile1_1)> _ <ToolboxItem(False)> _ Public Class WebService1: Inherits System.Web.Services.WebService <WebMethod()> _ Public Function GetActiveStates (ByVal knownCategoryValues As String, _ ByVal category As String) As CascadingDropDownNameValue() Dim values As New List(Of CascadingDropDownNameValue)() 'Fill values array' Return values.ToArray() End Function <WebMethod()> _ Public Function GetActiveCities (ByVal knownCategoryValues As String, _ ByVal category As String) As CascadingDropDownNameValue() Dim values As New List(Of CascadingDropDownNameValue)() Dim kv As StringDictionary = _ CascadingDropDown.ParseKnownCategoryValuesString(knownCategoryValues) Dim SelState As String = "" If kv.ContainsKey("State") Then SelState = kv("State") 'Fill values array' Return values.ToArray() End Function End Class Default.aspx.vb Imports System.Web.Services Imports System.Web.Script.Services Imports AjaxControlToolkit Partial Public Class _Default Inherits System.Web.UI.Page Protected Sub Submit_Click(ByVal sender As Object, _ ByVal e As EventArgs) Handles SubmitBtn.Click ResultsGrid.DataBind() End Sub End Class

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• Erlang OTP application design

  - by Toby Hede

  I am struggling a little coming to grips with the OTP development model as I convert some code into an OTP app. I am essentially making a web crawler and I just don't quite know where to put the code that does the actual work. I have a supervisor which starts my worker: -behaviour(supervisor). -define(CHILD(I, Type), {I, {I, start_link, []}, permanent, 5000, Type, [I]}). init(_Args) -> Children = [ ?CHILD(crawler, worker) ], RestartStrategy = {one_for_one, 0, 1}, {ok, {RestartStrategy, Children}}. In this design, the Crawler Worker is then responsible for doing the actual work: -behaviour(gen_server). start_link() -> gen_server:start_link(?MODULE, [], []). init([]) -> inets:start(), httpc:set_options([{verbose_mode,true}]), % gen_server:cast(?MODULE, crawl), % ok = do_crawl(), {ok, #state{}}. do_crawl() -> % crawl! ok. handle_cast(crawl}, State) -> ok = do_crawl(), {noreply, State}; do_crawl spawns a fairly large number of processes and requests that handle the work of crawling via http. Question, ultimately is: where should the actual crawl happen? As can be seen above I have been experimenting with different ways of triggering the actual work, but still missing some concept essential for grokering the way things fit together. Note: some of the OTP plumbing is left out for brevity - the plumbing is all there and the system all hangs together

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• reading excel using scriptom for groovy, producing xml

  - by john

  Dear friends, I got a program from http://kousenit.wordpress.com/2007/03/27/groovyness-with-excel-and-xml but I got some very strange results: 1) I can still print xml but two records are not readable. 2) I got exception suggesting some thing missing could some experts enlighten me about what might go wrong? I copied the program and result below. thanks! import org.codehaus.groovy.scriptom.ActiveXObject def addresses = new File('addresses1.xls').canonicalPath def xls = new ActiveXObject('Excel.Application') def workbooks = xls.Workbooks def workbook = workbooks.Open(addresses) // select the active sheet def sheet = workbook.ActiveSheet sheet.Visible = true // get the XML builder ready def builder = new groovy.xml.MarkupBuilder() builder.people { for (row in 2..1000) { def ID = sheet.Range("A${row}").Value.value if (!ID) break // use the builder to write out each person person (id: ID) { name { firstName sheet.Range("B${row}").Value.value lastName sheet.Range("C${row}").Value.value } address { street sheet.Range("D${row}").Value.value city sheet.Range("E${row}").Value.value state sheet.Range("F${row}").Value.value zip sheet.Range("G${row}").Value.value } } } } // close the workbook without asking for saving the file workbook.Close(false, null, false) // quits excel xls.Quit() xls.release() however, i got the following results: <people> <person id='1234.0'> <name> <firstName>[C@128a25</firstName> <lastName>[C@5e45</lastName> </name> <address> <street>[C@179ef7c</street> <city>[C@12f95de</city> <state>[C@138b554</state> <zip>12345.0</zip> </address> </person> </person> Exception thrown May 12, 2010 4:07:15 AM org.codehaus.groovy.runtime.StackTraceUtils sanitize WARNING: Sanitizing stacktrace: java.lang.NullPointerException at org.codehaus.groovy.runtime.callsite.GetEffectivePojoFieldSite.acceptGetProperty(GetEffectivePojoFieldSite.java:43) at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callGetProperty(AbstractCallSite.java:237) at sriptom4_excel$_run_closure1.doCall(sriptom4_excel.groovy:18) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [1]: http://kousenit.wordpress.com/2007/03/27/groovyness-with-excel-and-xml/

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• Creating a framework for ASP.NET web forms similar to Flex states.

  - by Shawn Simon

  I really enjoy the flex states framework. You define a few states for your control, and then can set child controls to only appear in certain states. Check out this code: <s:states> <s:State name="signin"/> <s:State name="register"/> </s:states> <mx:FormItem label="Last name:" includeIn="register" id="lastNameItem" alpha="0.0"> <s:TextInput id="lastName" width="220"/> </mx:FormItem> Now the last name form will only appear in the register screen. This would be really useful I think in .NET where you use the page for views like update / insert. I was considering extending the Page element to have a states property using extension methods, and adding the include in to controls. This way I could auto-hide controls based on the current view at render time. What is even cooler in Flex, is that you can use different handlers / properties based on the current state. <s:Button label="Sign in" label.register="Register" id="loginButton" enabled="true" click.signin="signin()" click.register="register()"/> I'm sure there's a way I could implement something similar to this as well. Do you think this is a good idea? Or does it just add a level of abstraction to framework that already has a poor separation of concerns?

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• How to highlight the button untill the next view is changed in iphone?

  - by Pugal Devan

  Hi, I am new to iphone development. I have created five buttons in the view controller. If i clicked the button it goes to the corresponding view. Now i want to display the button in highlighted state when it is clicked. It should go back to the normal state only when i click the other button.(See the image below). I have set the another image for highigthting buttons when i clicked it, but it shows that highlighted state only one sec. Now i want to display the buttons highlighted till another button is clicked. Same like a Tabbar operations.(I have used buttons instead of tabbar for my requirements). Now i have used the following code, void didLoad { [btn1 setImage:[UIImage imageNamed:@"ContentColor.png"] forState:UIControlStateHighlighted]; [btn2 setImage:[UIImage imageNamed:@"bColor.png"] forState:UIControlStateHighlighted]; [btn3 setImage:[UIImage imageNamed:@"ShColor.png"] forState:UIControlStateHighlighted]; [btn4 setImage:[UIImage imageNamed:@"PicturesColor.png"] forState:UIControlStateHighlighted]; [btn5 setImage:[UIImage imageNamed:@"infoColor.png"] forState:UIControlStateHighlighted]; } Please help me out. Thanks.

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• How to access "Custom" or non-System TFS workitem fields using PowerShell?

  - by DaBozUK

  When using PowerShell to extract information from TFS, I find that I can get at the standard fields but not "Custom" fields. I'm not sure custom is the correct term, but for example if I look at the Process Editor in VS2008 and edit the Work Item type, there are fields such as listed below, with Name, Type and RefName: Title String System.Title State String System.State Rev Integer System.Rev Changed By String System.ChangedBy I can access these with Get-TfsItemHistory: Get-TfsItemHistory "$/path" -Version "D01/12/10~" -R | Select -exp WorkItems | Format-Table Title, State, Rev, ChangedBy -Auto So far so good. However, there are also some other fields in the WorkItem type, which I'm calling "Custom" or non-System fields, e.g.: Activated By String Microsoft.VSTS.Common.ActivatedBy Resolved By String Microsoft.VSTS.Common.ResolvedBy And the following command does not retrieve the data, just spaces. Get-TfsItemHistory "$/path" -Version "D01/12/10~" -R | Select -exp WorkItems | Format-Table ActivatedBy, ResolvedBy -Auto I've also tried the names in quotes, the fully qualified refname, but no luck. How do you access these "non-System" fields? Thanks Boz UPDATE: From Keith's answer I can get the fields I need: Get-TfsItemHistory "$/Hermes/Main" -Version "D01/12/10~" -Recurse ` | Select ChangeSetId, Comment -exp WorkItems ` | Select ChangeSetId, Comment, @{n='WI-Id'; e={$_.Id}}, Title -exp Fields ` | Where {$_.ReferenceName -eq 'Microsoft.VSTS.Common.ResolvedBy'} ` | Format-Table ChangesetId, Comment, WI-Id, Title, @{n='Resolved By'; e={$_.Value}} -Auto

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• desing pattern for related inputs

  - by curiousMo

  My question is a design question : let's say i have a data entry web page with 4 drop down lists, each depending on the previous one, and a bunch of text boxes. country (ddl), state (ddl), city (ddl), boro (ddl), address (txtBox), zipcode(txtbox). and an object that represents a datarow with a value for each. naturally the country, state, city and boro values will be values of primary keys of some lookup tables. when the user chooses to edits that record, i would load it from database and load it into the page. the issue that I have is how to streamline loading the ddls. i have some code that would grab the object, look thru its values and move them to their corresponding input controls in one shot. but in this case i will have to load possible values of country, then assign values, then load values of state, then assign value ans so on. I guess i am looking for an elegant solution. i am using asp.net, but i think it is irrelevant to the question. i am looking more into a design pattern. thanks

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• jQuery/Javascript: Click event on a checkbox and the 'checked' attribute.

  - by b. e. hollenbeck

  The code: $('input.media-checkbox').live('click', function(e){ e.preventDefault(); var that = $(this); if (that.attr('checked') == 'checked'){ var m = that.attr('media'); var mid = 'verify_' + m; that.parents('div.state-container').find('ul.' + mid).remove(); that.attr('checked', false); } else { var url = AJAX_URL; $.ajax({ type: 'GET', url: url, dataType: 'html', success: function(data){ that.parents('li').siblings('li.verification').children('div.media-verification').append(data).fadeIn(500); that.attr('checked', 'checked'); } }); } return false; }); I am ajaxing in a form, then firing the click event on relevant checkboxes to ajax in another partial if necessary. The form is inserted nicely, and the click events are fired, checking the boxes that need to be checked and firing the second ajax, since the checked attribute of the checkbox was initially false. What's curdling my cheese is if I UNCHECK one of those boxes. Despite e.preventDefault(), the checked attribute is set to false BEFORE the test, so the if statement always executes the else statement. I've also tried this with $.is(':checked'), so I'm completely baffled. It appears that unchecked - checked state reads the original state, but checked - unchecked doesn't. Any help?

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• CascadingDropDown ViewState Problem

  - by Steven

  I have two Ajax CascadingDropDown extenders on my page. After a postback, the value of the first dropdown is set (presumably) triggering an event for the second dropdown to refresh. Question: How do I maintain both the contents (from queries) and selected value of both dropdowns after postback? C# answers also welcome. Default.aspx Active States<br /><asp:DropDownList ID="StatesDrop" runat="server" /><br /> Active Cities<br /><asp:DropDownList ID="CitiesDrop" runat="server" /><br /> <ajax:CascadingDropDown ID="StatesCasc" TargetControlID="StatesDrop" ServicePath="WebService1.asmx" ServiceMethod="GetActiveStates" Category="States" runat="server" PromptText="Select a State" PromptValue="?" /> <ajax:CascadingDropDown ID="CitiesCasc" TargetControlID="CitiesDrop" ServicePath="WebService1.asmx" ServiceMethod="GetActiveCities" Category="Cities" runat="server" ParentControlID="StatesDrop" PromptText="Select a City" PromptValue="?" /> WebService1.asmx.vb Imports System.Web.Services Imports System.Web.Services.Protocols Imports System.ComponentModel Imports System.Web.Script.Services Imports AjaxControlToolkit <System.Web.Script.Services.ScriptService()> _ <System.Web.Services.WebService(Namespace:="http://tempuri.org/")> _ <System.Web.Services.WebServiceBinding _ (ConformsTo:=WsiProfiles.BasicProfile1_1)> _ <ToolboxItem(False)> _ Public Class WebService1: Inherits System.Web.Services.WebService <WebMethod()> _ Public Function GetActiveStates (ByVal knownCategoryValues As String, _ ByVal category As String) As CascadingDropDownNameValue() Dim values As New List(Of CascadingDropDownNameValue)() 'Populate values with query' Return values.ToArray() End Function <WebMethod()> _ Public Function GetActiveCities (ByVal knownCategoryValues As String, _ ByVal category As String) As CascadingDropDownNameValue() Dim kv As StringDictionary = _ CascadingDropDown.ParseKnownCategoryValuesString(knownCategoryValues) Dim SelState As String = "" If kv.ContainsKey("State") Then SelState = kv("State") Dim values As New List(Of CascadingDropDownNameValue)() ' Populate values with query.' Return values.ToArray() End Function End Class

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• Some Async Socket Code - Help with Garbage Collection?

  - by divinci

  Hi all, I think this question is really about my understanding of Garbage collection and variable references. But I will go ahead and throw out some code for you to look at. // Please note do not use this code for async sockets, just to highlight my question // SocketTransport // This is a simple wrapper class that is used as the 'state' object // when performing Async Socket Reads/Writes public class SocketTransport { public Socket Socket; public byte[] Buffer; public SocketTransport(Socket socket, byte[] buffer) { this.Socket = socket; this.Buffer = buffer; } } // Entry point - creates a SocketTransport, then passes it as the state // object when Asyncly reading from the socket. public void ReadOne(Socket socket) { SocketTransport socketTransport_One = new SocketTransport(socket, new byte[10]); socketTransport_One.Socket.BeginRecieve ( socketTransport_One.Buffer, // Buffer to store data 0, // Buffer offset 10, // Read Length SocketFlags.None // SocketFlags new AsyncCallback(OnReadOne), // Callback when BeginRead completes socketTransport_One // 'state' object to pass to Callback. ); } public void OnReadOne(IAsyncResult ar) { SocketTransport socketTransport_One = ar.asyncState as SocketTransport; ProcessReadOneBuffer(socketTransport_One.Buffer); // Do processing // New Read // Create another! SocketTransport (what happens to first one?) SocketTransport socketTransport_Two = new SocketTransport(socket, new byte[10]); socketTransport_Two.Socket.BeginRecieve ( socketTransport_One.Buffer, 0, 10, SocketFlags.None new AsyncCallback(OnReadTwo), socketTransport_Two ); } public void OnReadTwo(IAsyncResult ar) { SocketTransport socketTransport_Two = ar.asyncState as SocketTransport; .............. So my question is: The first SocketTransport to be created (socketTransport_One) has a strong reference to a Socket object (lets call is ~SocketA~). Once the async read is completed, a new SocketTransport object is created (socketTransport_Two) also with a strong reference to ~SocketA~. Q1. Will socketTransport_One be collected by the garbage collector when method OnReadOne exits? Even though it still contains a strong reference to ~SocketA~ Thanks all!

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• android python full integration

  - by Grzegorz Oledzki

  Is there a way to fully integrate Python with Java code on Android platform? Yes, I saw the question about running Python on Android and Android Scripting Environment (ASE). But that doesn't seem to be enough (correct me if I am wrong). I wanted to be able not only to invoke a Python script from within Java code, but have a full integration. The feature I need the most is the ability to have a state of execution of python code saved and be able to run several parts of code on demand against the same execution state. On JavaSE I would rely on Jython. I believe its simplest example shows it all (and some other features too, like something I would call variable state introspection): http://www.jython.org/archive/21/docs/embedding.html PythonInterpreter interp = new PythonInterpreter(); System.out.println("Hello, brave new world"); interp.exec("import sys"); interp.exec("print sys"); interp.set("a", new PyInteger(42)); interp.exec("print a"); interp.exec("x = 2+2"); PyObject x = interp.get("x"); System.out.println("x: "+x); System.out.println("Goodbye, cruel world"); Is it possible on Android? Is ASE a way to go?

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• Netlogo: error when putting variable in table, only constants allowe??

  - by Chantal

  Hello, Currently I am working on a Netlogo program where I need to use nodes and links for vehicle routing problem. (links are called streets in the program) Here I have some practical problems of how to input variable linkspeed in a table with another node. Constants like 200 etc are fine. Online I found some examples where variables are used, but I do not know why I keep getting the following error: Expected a constant. (or why netlogo expects a constant) Here is the relevant piece of code: extensions [table] streets-own [linkspeed linktoll] nodes-own [netw] ;; In another piece of code linkspeed is assigned successfully to the links to cheapcalc ;; start conditions set costs very high 300000 ;; state 3 unsearched state 2 searching state 1 searched (for later purposes) ask nodes [ set i 0 set j count nodes set netw table:make while [i < j][ table:put netw (i) [3000000 3] set i (i + 1)]] set i 0 let k 0 ask node 35 ;; here i use node 35 as an example. ;; node 35 is connected to node 34, 36, 20 and 50 [table:put netw (35) [0 1] ;; node need to search costs to travel to itself ;; putting constants is ok. while [i < j] [ask my-links [ask both-ends [if (who != 35) [set color blue ;; set temp ([linkspeed] of street 35 who) ;; here my real goal is to put this in stat of i. but i is easier than linkspeed. table:put netw (who) [ i 2 ] ] ] ] set i (i + 1)] ] ;; next node for later, no it is just repetition of the same. end I hope somebody knows what is going on... Kind regards, Chantal

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• how to display my list with n amount on each line in Python

  - by user1786698

  im trying to display my list with 7 states on each line here is what i have so far, but it displays as one long string of all the states with quotes around each state. I forgot to mention that this is for my CS class and we havent learned iter yet so we not allowed to use it. the only hint i was given was to to turn STATE_LIST into a string then use '\n' to break it up state = str(STATE_LIST) displaystates = Text(Point(WINDOW_WIDTH/2, WINDOW_HEIGHT/2), state.split('\n')) displaystates.draw(win) and STATE_LIST looks like this STATE_VOTES = { "AL" : 9, # Alabama "AK" : 3, # Alaska "AZ" : 11, # Arizona "AR" : 6, # Arkansas "CA" : 55, # California "CO" : 9, # Colorado "CT" : 7, # Connecticut "DE" : 3, # Delaware "DC" : 3, # Washington DC "FL" : 29, # Florida "GA" : 16, # Georgia "HI" : 4, # Hawaii "ID" : 4, # Idaho "IL" : 20, # Illinois "IN" : 11, # Indiana "IA" : 6, # Iowa "KS" : 6, # Kansas "KY" : 8, # Kentucky "LA" : 8, # Louisiana "ME" : 4, # Maine "MD" : 10, # Maryland "MA" : 11, # Massachusetts "MI" : 16, # Michigan "MN" : 10, # Minnesota "MS" : 6, # Mississippi "MO" : 10, # Missouri "MT" : 3, # Montana "NE" : 5, # Nebraska "NV" : 6, # Nevada "NH" : 4, # New Hampshire "NJ" : 14, # New Jersey "NM" : 5, # New Mexico "NY" : 29, # New York "NC" : 15, # North Carolina "ND" : 3, # North Dakota "OH" : 18, # Ohio "OK" : 7, # Oklahoma "OR" : 7, # Oregon "PA" : 20, # Pennsylvania "RI" : 4, # Rhode Island "SC" : 9, # South Carolina "SD" : 3, # South Dakota "TN" : 11, # Tennessee "TX" : 38, # Texas "UT" : 6, # Utah "VT" : 3, # Vermont "VA" : 13, # Virginia "WA" : 12, # Washington "WV" : 5, # West Virginia "WI" : 10, # Wisconsin "WY" : 3 # Wyoming } STATE_LIST = sorted(list(STATE_VOTES.keys())) I am trying to get it to look somewhat like this

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• Can LINQ expression classes implement the observer pattern instead of deferred execution?

  - by Tormod

  Hi. We have issues within an application using a state machine. The application is implemented as a windows service and is iteration based (it "foreaches" itself through everything) and there are myriads of instances being processed by the state machine. As I'm reading the MEAP version of Jon Skeets book "C# in Depth, 2nd ed", I'm wondering if I can change the whole thing to use linq expression instances so that guards and conditions are represented using expression trees. We are building many applications on this state machine engine and would probably greatly benefit from the new Expression tree visualizer in VS 2010 Now, simple example. If I have an expression tree where there is an OR Expression condition with two sub nodes, is there any way that these can implement the observer pattern so that the expression tree becomes event driven? If a condition change, it should notify its parent node (the OR node). Since the OR node then changes from "false" to "true", then it should notify ITS parent and so on. I love the declarative model of expression trees, but the deferred execution model works in opposite direction of the control flow if you want event based "live" conditions. Am I off on a wild goose chase here? Or is there some concept in the BCL that may help me achieve this?

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