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  • How do I Resolve dependancies that rely on transient context data using castle windsor?

    - by Dan Ryan
    I have a WCF service application that uses a component called EnvironmentConfiguration that holds configuration information for my application. I am converting this service so that it can be used by different applications that have different configuration requirements. I want to identify the configuration to use by allowing an additional parameter to be passed to the service call i.e. public void DoSomething(string originalParameter, string callingApplication) What is the recommended way to alter the behaviour of the EnvironmentConfiguration class based on the transient data (callingApplication) without having to pass the callingApplication variable to all the component methods that need configuration information?

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  • weakref list in python

    - by Dan
    I'm in need of a list of weak references that deletes items when they die. Currently the only way I have of doing this is to keep flushing the list (removing dead references manually). I'm aware there's a WeakKeyDictionary and a WeakValueDictionary, but I'm really after a WeakList, is there a way of doing this? Here's an example: import weakref class A(object): def __init__(self): pass class B(object): def __init__(self): self._references = [] def addReference(self, obj): self._references.append(weakref.ref(obj)) def flush(self): toRemove = [] for ref in self._references: if ref() is None: toRemove.append(ref) for item in toRemove: self._references.remove(item) b = B() a1 = A() b.addReference(a1) a2 = A() b.addReference(a2) del a1 b.flush() del a2 b.flush()

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  • If I'm updating a DataRow, do I lock the entire DataTable or just the DataRow?

    - by Dan Tao
    Suppose I'm accessing a DataTable from multiple threads. If I want to access a particular row, I suspect I need to lock that operation (I could be mistaken about this, but at least I know this way I'm safe): // this is a strongly-typed table OrdersRow row = null; lock (orderTable.Rows.SyncRoot) { row = orderTable.FindByOrderId(myOrderId); } But then, if I want to update that row, should I lock the table (or rather, the table's Rows.SyncRoot object) again, or can I simply lock the row?

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  • How do I change variables from different classes?

    - by Dan T
    Before I delve into it, I'm very new to Android and I have just started learning Java last month. I've hit bumps while trying to develop my first simple app. Most of these hurdles were jumped thanks to random tutorials online. MY CODE IS VERY MESSY. Any tips are appreciated. The question above is quite broad, but this is what I want to do: It's a essentially a blood alcohol content calculator / drink keeper-tracker. Basic layout: http://i.imgur.com/JGuh7.jpg The buttons along the bottom are just regular buttons, not ImageButtons (had problems with that) Here's some example code of one: <Button android:id="@+id/Button01" android:layout_width="wrap_content" android:layout_marginRight="5dp" android:background="@drawable/addbeer"/> The buttons and TextView are all in main.xml. I have variables defined in a class called Global.java: package com.dantoth.drinkingbuddy; import android.app.Activity; public class Global extends Activity{ public static double StandardDrinks = 0; public static double BeerOunces = 12; public static double BeerPercentAlcohol = .05; public static double BeerDrink = BeerOunces * BeerPercentAlcohol; public static double BeerDrinkFinal = BeerDrink * 1.6666666; public static double ShotOunces = 1.5; public static double ShotPercentAlcohol = .4; public static double ShotDrink = ShotOunces * ShotPercentAlcohol; public static double ShotDrinkFinal = ShotDrink * 1.6666666; public static double WineOunces = 5; public static double WinePercentAlcohol = .12; public static double WineDrink = WineOunces * WinePercentAlcohol; public static double WineDrinkFinal = WineDrink * 1.6666666; public static double OtherOunces; public static double OtherPercentAlcohol; public static double OtherDrink = OtherOunces * (OtherPercentAlcohol * .01); public static double OtherDrinkFinal = OtherDrink * 1.6666666; public static double GenderConstant = 7.5; //9 for female public static double Weight = 180; public static double TimeDrinking = 60; public static double Hours = TimeDrinking / 60; public static double Bac = ((StandardDrinks / 2) * (GenderConstant / Weight)) - (0.017 * Hours); } The last variable is the important part. It calculates your BAC based on the factors involved. When I press the add beer button (Button01) I make it add 1 to StandardDrinks, simulating drinking one beer. The other variables in the Bac formula have values assigned to them in Global.java. The code that makes the beer button do stuff is in my regular class, drinkingbuddy.java: public class DrinkingBuddy extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Button button = (Button) findViewById(R.id.Button01); button.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { Global.StandardDrinks = Global.StandardDrinks + Global.BeerDrinkFinal; Toast.makeText(DrinkingBuddy.this, "Mmmm... Beer", Toast.LENGTH_SHORT).show(); } }); By my perception, StandardDrinks should now have a value of 1. However, when I click the Calculate BAC button (Button05) it merely outputs the variable Bac as if StandardDrinks was still set to 0. Here is the code for the Calculate BAC button (Button05): Button button4 = (Button) findViewById(R.id.Button05); button4.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { TextView texty; texty = (TextView) findViewById(R.id.texty1); texty.setText("Your BAC is " + Global.Bac ); } }); It outputs the following to the text view: "Your BAC is -0.017". This is the Bac value for if StandardDrinks was still 0, so obviously there is some problem communicating between the classes. Can anyone help me?? The other elements of the formula (weight, time spent drinking, and the alcohol %'s and such) are variables because I will ultimately allow the user to change those values in the settings. I've heard around the water cooler that global variables are not good programming style, but this is the closest I've come to getting it to work. Any other ways of doing it are very much welcomed!

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  • Dealing with unwanted port numbers on localhost when debugging in Visual Studio

    - by Dan Bailiff
    So when I'm trying to debug a project in Visual Studio, I'll often have 1 or more services that I need to call. These services are separate projects and I'll launch them in separate instances of VS. ASP dev server kindly launches them with temporary port numbers attached. This would be fine except for my programs are looking for an IP without a port attached. (Typically it's as simple as "localhost"!) I've coped by using web config settings and changing the xml to use the port number while debugging. This still doesn't always work and occasionally I'll still have to fudge it and insert port numbers as strings in code! UGH! Then I have to remember to undo all the port herding code before deployment... I want to stop doing this: string _strBaseURL = String.Format("http://{0}:2277", ConfigurationManager.AppSettings["myservice_ip"].ToString()); What is the best practice here? Am I doomed to port herding while debugging VS apps?

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  • Managing execution priorities and request expiry time in your web application

    - by Dan
    Some installations that run our applications can be under hefty stress on a busy day. Our clients ask us is there is a way to manage priorities in our application. For example, in a typical internet banking application, banks are interested in having the form “Transfer money” responsive, while the “Statement” page is a lot less critical. Not being able to transfer money is a direct loss for the bank, while not being able to produce a statement or something similar can be fixed with an apology. AFAIK, neither can you manage different request or session timeouts in a typical web application, it is one value for the whole of your web app. Managing message priority and expiry time is a typical feature in many middleware platforms. Something like this can be useful for a web front end as well. Do any of web servers (either java or .net) or web frameworks provide these features? How would you go about implementing it if you’d have to go for roll-your-own?

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  • PostSharp when using DataContractSerializer?

    - by Dan Bryant
    I have an Aspect that implements INotifyPropertyChanged on a class. The aspect includes the following: [OnLocationSetValueAdvice, MethodPointcut("SelectProperties")] public void OnPropertySet(LocationInterceptionArgs args) { var currentValue = args.GetCurrentValue(); bool alreadyEqual = (currentValue == args.Value); // Call the setter args.ProceedSetValue(); // Invoke method OnPropertyChanged (ours, the base one, or the overridden one). if (!alreadyEqual) OnPropertyChangedMethod.Invoke(args.Location.Name); } This works fine when I instantiate the class normally, but I run into problems when I deserialize the class using a DataContractSerializer. This bypasses the constructor, which I'm guessing interferes with the way that PostSharp sets itself up. This ends up causing a NullReferenceException in an intercepted property setter, but before it has called the custom OnPropertySet, so I'm guessing it interferes with setting up the LocationInterceptionArgs. Has anyone else encountered this problem? Is there a way I can work around it? I did some more research and discovered I can fix the issue by doing this: [OnDeserializing] private void OnDeserializing(StreamingContext context) { AspectUtilities.InitializeCurrentAspects(); } I thought, okay, that's not too bad, so I tried to do this in my Aspect: private IEnumerable<MethodInfo> SelectDeserializing(Type type) { return type.GetMethods(BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public).Where( t => t.IsDefined(typeof (OnDeserializingAttribute), false)); } [OnMethodEntryAdvice, MethodPointcut("SelectDeserializing")] public void OnMethodEntry(MethodExecutionArgs args) { AspectUtilities.InitializeCurrentAspects(); } Unfortunately, even though it intercepts the method properly, it doesn't work. I'm thinking the call to InitializeCurrentAspects isn't getting transformed properly, since it's now inside the Aspect rather than directly inside the aspect-enhanced class. Is there a way I can cleanly automate this so that I don't have to worry about calling this on every class that I want to have the Aspect?

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  • Need to calculate offsetRight in javascript

    - by Dan Bailiff
    I need to calculate the offsetRight of a DOM object. I already have some rather simple code for getting the offsetLeft, but there is no javascript offsetRight property. If I add the offsetLeft and offsetWidth, will that work? Or is there a better way? function getOffsetLeft(obj) { if(obj == null) return 0; var offsetLeft = 0; var tmp = obj; while(tmp != null) { offsetLeft += tmp.offsetLeft; tmp = tmp.offsetParent; } return offsetLeft; } function getOffsetRight(obj) { if (obj == null) return 0; var offsetRight = 0; var tmp = obj; while (tmp != null) { offsetRight += tmp.offsetLeft + tmp.offsetWidth; tmp = tmp.offsetParent; } return offsetRight; }

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  • Updating a deallocated UIWebView from a background thread

    - by Dan Ray
    As you can see from the title, I've programmed myself into a corner and I've got several things working against me... In a UIViewController subclass that manages a large and complex view. One part of it is a UIWebView that contains output from a web request that I had to build and execute, and manually assemble HTML from. Since it takes a second or two to run, I dropped it into the background by calling self performSelectorInBackground:. Then from that method I call there, I use self performSelectorOnMainThread: to get back to the surface of the thread stack to update the UIWebView with what I just got. Like this (which I've cut down to show only the relevant issues): -(void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation { //then get mapquest directions NSLog(@"Got called to handle new location!"); [manager stopUpdatingLocation]; [self performSelectorInBackground:@selector(getDirectionsFromHere:) withObject:newLocation]; } - (void)getDirectionsFromHere:(CLLocation *)newLocation { NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; CLLocationCoordinate2D here = newLocation.coordinate; // assemble a call to the MapQuest directions API in NSString *dirURL // ...cut for brevity NSLog(@"Query is %@", dirURL); NSString *response = [NSString stringWithContentsOfURL:[NSURL URLWithString:dirURL] encoding:NSUTF8StringEncoding error:NULL]; NSMutableString *directionsOutput = [[NSMutableString alloc] init]; // assemble response into an HTML table in NSString *directionsOutput // ...cut for brevity [self performSelectorOnMainThread:@selector(updateDirectionsWithHtml:) withObject:directionsOutput waitUntilDone:NO]; [directionsOutput release]; [pool drain]; [pool release]; } - (void)updateDirectionsWithHtml:(NSString *)directionsOutput { [self.directionsWebView loadHTMLString:directionsOutput baseURL:nil]; } This all works totally great, UNLESS I've backed out of this view controller before CLLocationManager hits its delegate method. If this happens after I've already left this view, I get: 2010-06-07 16:38:08.508 EverWondr[180:760b] bool _WebTryThreadLock(bool), 0x1b6830: Tried to obtain the web lock from a thread other than the main thread or the web thread. This may be a result of calling to UIKit from a secondary thread. Crashing now... Despite what this says, I can repeatably cause this crash when I back out too early. I'm not at all convinced that attempting a UI update from a background thread is really the issue; I think it's that my UIWebView is deallocated. I suspect that the fact I was just IN a background thread makes the runtime suspect something's up about that, but I feel fairly sure that's not it. So how do I tell CLLocationManager not to worry about it, when I'm backing out of that view? I tried [self.locationManager stopUpdatingLocation] inside my viewWillDisappear method, but that didn't do it. (Incidentally, MapQuest's apis are FANTASTIC. Way WAY better than anything Google provides. I can't recommend them highly enough.)

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  • How to manually add a legend to a ggplot object

    - by Dan
    I have this data frame: structure(list(month_num = 1:24, founded_month = c(4L, 5L, 6L, 7L, 8L, 9L, 10L, 11L, 12L, 1L, 2L, 3L, 4L, 5L, 6L, 7L, 8L, 9L, 10L, 11L, 12L, 1L, 2L, 3L), founded_year = c(2008L, 2008L, 2008L, 2008L, 2008L, 2008L, 2008L, 2008L, 2008L, 2009L, 2009L, 2009L, 2009L, 2009L, 2009L, 2009L, 2009L, 2009L, 2009L, 2009L, 2009L, 2010L, 2010L, 2010L), count = c(270L, 222L, 256L, 250L, 277L, 268L, 246L, 214L, 167L, 408L, 201L, 225L, 203L, 220L, 230L, 225L, 177L, 207L, 166L, 135L, 116L, 122L, 69L, 42L), month_abb = c("Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec", "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec", "Jan", "Feb", "Mar"), short_year = c("08", "08", "08", "08", "08", "08", "08", "08", "08", "09", "09", "09", "09", "09", "09", "09", "09", "09", "09", "09", "09", "10", "10", "10" ), proj = c(282, 246, 292, 298, 337, 340, 330, 310, 275, 528, 333, 369, 359, 388, 410, 417, 381, 423, 394, 375, 368, 386, 345, 330), label = c("Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec", "Jan\n09", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec", "Jan\n10", "Feb", "Mar")), .Names = c("month_num", "founded_month", "founded_year", "count", "month_abb", "short_year", "proj", "label"), row.names = c(NA, -24L), class = "data.frame") and i've got all of this done (I know the code's a bit ugly looking, pointers appreciated): p <- ggplot(m_summary2, aes(x = month_num, y = count)) p + geom_line(colour = rgb(0/255, 172/255, 0/255)) + geom_point(colour = rgb(0/255, 172/255, 0/255)) + geom_line(aes(x = m_summary2$month_num, y = m_summary2$proj), colour = rgb(18/255, 111/255, 150/255)) + geom_point(aes(x = m_summary2$month_num, y = m_summary2$proj), colour = rgb(18/255, 111/255, 150/255)) + scale_x_continuous("Month", breaks = m_summary2$month_num, labels = m_summary2$label) + scale_y_continuous("# Startups Founded") + opts(title = paste("# Startups Founded:", m_summary2$month_abb[1], m_summary2$short_year[1], "-", m_summary2$month_abb[nrow(m_summary2)], m_summary2$short_year[nrow(m_summary2)])) Now I would like to add a legend to clarify that the blue line is a projection and the green line is the current data. Thanks in advance!

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  • How to login to youtube from php?

    - by dan
    Hi, I want to use the youtube api to get the users new subscription videos with this api call: http://gdata.youtube.com/feeds/api/users/default/newsubscriptionvideos Without logging in I get this response: User authentication required. Error 401 How can I login to youtube from php?

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  • jQuery UI - Draggable is not a function?

    - by Dan
    Hi, I've trying to use the draggable effect on some divs on a page, but whenever I load the page, I get the error message: Error: $(".draggable").draggable is not a function I've had a look around it seemed other people were having this problem as they had not included the jQuery UI javascript file, but I definitely have. The following is within the head tag of my page: <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.1/jquery.min.js" type="text/javascript"></script> <script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.1/jquery-ui.min.js"></script> Can anyone suggest a solution? Any advice appreciated. Thanks.

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  • Windows Server 2008 on VPC (Host: Win 7)?

    - by Dan
    Is it possible to test Windows 2008 server via VPC when my host of a Windows 7 machine? I don't see anywhere where it says this is possible? The only VPC images (Windows 2008 R2) that I download from Microsoft state that the host machine must be Windows 2008. Is there an alternative?

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  • How to get R to recognize your working directory as its working directory?

    - by Dan Goldstein
    I use R under Windows on several machines. I know you can set the working directory from within an R script, like this setwd("C:/Documents and Settings/username/My Documents/x/y/z") ... but then this breaks the portability of the script. It's also annoying to have to reverse all the slashes (since Windows gives you backslashes) Is there a way to start R in a particular working directory so that you don't need to do this at the script level?

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  • Considerations when architecting an extensible application using MEF

    - by Dan Bryant
    I've begun experimenting with dependency injection (in particular, MEF) for one of my projects, which has a number of different extensibility points. I'm starting to get a feel for what I can do with MEF, but I'd like to hear from others who have more experience with the technology. A few specific cases: My main use case at the moment is exposing various singleton-like services that my extensions make use of. My Framework assembly exposes service interfaces and my Engine assembly contains concrete implementations. This works well, but I may not want to allow all of my extensions to have access to all of my services. Is there a good way within MEF to limit which particular imports I allow a newly instantiated extension to resolve? This particular application has extension objects that I repeatedly instantiate. I can import multiple types of Controllers and Machines, which are instantiated in different combinations for a Project. I couldn't find a good way to do this with MEF, so I'm doing my own type discovery and instantiation. Is there a good way to do this within MEF or other DI frameworks? I welcome input on any other things to watch out for or surprising capabilities you've discovered that have changed the way you architect.

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  • Why would the VB.NET compiler think an interface isn't implemented when it is?

    - by Dan Tao
    I have this happen sometimes, particularly with the INotifyPropertyChanged interface in my experience but I have no idea if the problem is limited to that single interface (which would seem bizarre) or not. Let's say I have some code set up like this. There's an interface with a single event. A class implements that interface. It includes the event. Public Interface INotifyPropertyChanged Event PropertyChanged As PropertyChangedEventHandler End Interface Public Class Person Implements INotifyPropertyChanged Public Event PropertyChanged _ (ByVal sender As Object, ByVal e As PropertyChangedEventArgs) _ Implements INotifyPropertyChanged.PropertyChanged ' more code below ' End Class Every now and then, when I build my project, the compiler will suddenly start acting like the above code is broken. It will report that the Person class does not implement INotifyPropertyChanged because it doesn't have a PropertyChanged event; or it will say the PropertyChanged event can't implement INotifyPropertyChanged.PropertyChanged because their signatures don't match. This is weird enough as it is, but here's the weirdest part: if I just cut out the line starting with Event PropertyChanged and then paste it back in, the error goes away. The project builds. Does anybody have any clue what could be going on here?

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  • SQL 05 full-text query fails "Specified module could not be found."

    - by Dan Bailiff
    I'm running SQL 2005 on Windows XP. I have a database table that has full text searching enabled. I was able to build and even re-build the index. However, when I try to query it like this: Select * from fulltext_english WHERE CONTAINS(page_data, 'causes') I get this error: Msg 7619, Level 16, State 1, Line 1 The execution of a full-text query failed. "The specified module could not be found." Did I miss something on the install? Is this a dll issue? I've googled and binged for days and can't find anything similar to this message. Thanks!

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  • F# passing an operator with arguments to a function

    - by dan
    Can you pass in an operation like "divide by 2" or "subtract 1" using just a partially applied operator, where "add 1" looks like this: List.map ((+) 1) [1..5];; //equals [2..6] // instead of having to write: List.map (fun x-> x+1) [1..5] What's happening is 1 is being applied to (+) as it's first argument, and the list item is being applied as the second argument. For addition and multiplication, this argument ordering doesn't matter. Suppose I want to subtract 1 from every element (this will probably be a common beginners mistake): List.map ((-) 1) [1..5];; //equals [0 .. -4], the opposite of what we wanted 1 is applied to the (-) as its first argument, so instead of (list_item - 1), I get (1 - list_item). I can rewrite it as adding negative one instead of subtracting positive one: List.map ((+) -1) [1..5];; List.map (fun x -> x-1) [1..5];; // this works too I'm looking for a more expressive way to write it, something like ((-) _ 1), where _ denotes a placeholder, like in the Arc language. This would cause 1 to be the second argument to -, so in List.map, it would evaluate to list_item - 1. So if you wanted to map divide by 2 to the list, you could write: List.map ((/) _ 2) [2;4;6] //not real syntax, but would equal [1;2;3] List.map (fun x -> x/2) [2;4;6] //real syntax equivalent of the above Can this be done or do I have to use (fun x -> x/2)? It seems that the closest we can get to the placeholder syntax is to use a lambda with a named argument.

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  • How can I get the dimensions of a drawn string without padding?

    - by Dan Herbert
    I'm trying to create an image with some text on it and I want the image's size to match the size of the rendered text. When I use System.Windows.Forms.TextRenderer.MeasureText(...) to measure the text, I get dimensions that include font padding. When the text is rendered, it seems to use the same padding. Is there any way to determine the size of a string of text and then render it without any padding? This is the code I've tried: // Measure the text dimensions var text = "Hello World"; var fontFamily = new Font("Arial", 30, FontStyle.Regular); var textColor = new SolidBrush(Color.Black); Size textSize = TextRenderer.MeasureText(text, fontFamily, Size.Empty, TextFormatFlags.NoPadding); // Render the text with the given dimensions Bitmap bmp = new Bitmap(textSize.Width, textSize.Height); Graphics g = Graphics.FromImage(bmp); g.TextRenderingHint = TextRenderingHint.AntiAliasGridFit; g.DrawString(text, fontFamily, textColor, new PointF(0, 0)); bmp.Save("output.png", ImageFormat.Png); This is what currently gets rendered out: This is what I want to render: I also looked into Graphics.MeasureString(...), but that can only be used on an existing Graphics object. I want to know the size before creating the image. Also, calling Graphics.MeasureString(...) returns the same dimensions, so it doesn't help me any.

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  • ACT Professional for Windows-Memory leak?

    - by Dan
    I have an ACT! professional for Windows V11.1, with the latest SQL service pack (SP3) and have an apparent memory leak on the server. After a restart the ACT! SQL instance (SQLSERVR) consumes almost all the available memory on the server, we have added more memory to the server (it is running under Hyper-V) but it continues to consume it all. I have not been able to connect to the SQL server instance using management studio in order to limit the amount of RAM it is allocated. Are there any potential solutions for this? or should I continue to restart the services?

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  • How do I close a database connection being used to produce a streaming result in a WCF service?

    - by Dan
    I have been unable to find any documentation on properly closing database connections in WCF service operations. I have a service that returns a streamed response through the following method. public virtual Message GetData() { string sqlString = BuildSqlString(); SqlConnection conn = Utils.GetConnection(); SqlCommand cmd = new SqlCommand(sqlString, conn); XmlReader xr = cmd.ExecuteXmlReader(); Message msg = Message.CreateMessage( OperationContext.Current.IncomingMessageVersion, GetResponseAction(), xr); return msg; } I cannot close the connection within the method or the streaming of the response message will be terminated. Since control returns to the WCF system after the completion of that method, I don't know how I can close that connection afterwards. Any suggestions or pointers to additional documentation would be appreciated.

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  • Zend framework currency validation

    - by Dan
    How can I validate (a form element in this case) to ensure that the value is a currency? Have looked at Zend_Validate_Float. Needs to check that value is between 0 and 2dp. Ideally locale-aware (as ZVF is) to allow for locale specific formatting (thousands, decimal as comma/dot) Would also want to extend to allow/disallow negative values And provide optional upper/lower limits. Is the key, as I can do 3. and 4. with a chain. Do I need regex?

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  • Custom iterator for a class based on two sets

    - by Dan Hook
    I have a class that contains two sets. They both contain the same key type but have different compare operations. I would like to provide an iterator for the class that iterates through the elements of both sets. I want to start with one set, then when I increment an iterator pointing to the last element of the first set, I want to go to the first element of the second set. How do I do this? I would like to preserve the bidirectional iterator semantics of std::set, but if it turns out that implementing a forward iterator is much easier, so be it. I'm willing to use the Boost Iterator library if that would help.

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