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  • Workfow foundation 4.0 Flow chart

    - by Sandy
    We already have our own workflow engine implemented about 5 years ago, currently we are thinking of leveraging the new flow chart control in .net 4.0 for the visual presentations of our existing states. So can we simply using this flow chart control without using other workflow foundations features?

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  • DTracing TCP congestion control

    - by user12820842
    In a previous post, I showed how we can use DTrace to probe TCP receive and send window events. TCP receive and send windows are in effect both about flow-controlling how much data can be received - the receive window reflects how much data the local TCP is prepared to receive, while the send window simply reflects the size of the receive window of the peer TCP. Both then represent flow control as imposed by the receiver. However, consider that without the sender imposing flow control, and a slow link to a peer, TCP will simply fill up it's window with sent segments. Dealing with multiple TCP implementations filling their peer TCP's receive windows in this manner, busy intermediate routers may drop some of these segments, leading to timeout and retransmission, which may again lead to drops. This is termed congestion, and TCP has multiple congestion control strategies. We can see that in this example, we need to have some way of adjusting how much data we send depending on how quickly we receive acknowledgement - if we get ACKs quickly, we can safely send more segments, but if acknowledgements come slowly, we should proceed with more caution. More generally, we need to implement flow control on the send side also. Slow Start and Congestion Avoidance From RFC2581, let's examine the relevant variables: "The congestion window (cwnd) is a sender-side limit on the amount of data the sender can transmit into the network before receiving an acknowledgment (ACK). Another state variable, the slow start threshold (ssthresh), is used to determine whether the slow start or congestion avoidance algorithm is used to control data transmission" Slow start is used to probe the network's ability to handle transmission bursts both when a connection is first created and when retransmission timers fire. The latter case is important, as the fact that we have effectively lost TCP data acts as a motivator for re-probing how much data the network can handle from the sending TCP. The congestion window (cwnd) is initialized to a relatively small value, generally a low multiple of the sending maximum segment size. When slow start kicks in, we will only send that number of bytes before waiting for acknowledgement. When acknowledgements are received, the congestion window is increased in size until cwnd reaches the slow start threshold ssthresh value. For most congestion control algorithms the window increases exponentially under slow start, assuming we receive acknowledgements. We send 1 segment, receive an ACK, increase the cwnd by 1 MSS to 2*MSS, send 2 segments, receive 2 ACKs, increase the cwnd by 2*MSS to 4*MSS, send 4 segments etc. When the congestion window exceeds the slow start threshold, congestion avoidance is used instead of slow start. During congestion avoidance, the congestion window is generally updated by one MSS for each round-trip-time as opposed to each ACK, and so cwnd growth is linear instead of exponential (we may receive multiple ACKs within a single RTT). This continues until congestion is detected. If a retransmit timer fires, congestion is assumed and the ssthresh value is reset. It is reset to a fraction of the number of bytes outstanding (unacknowledged) in the network. At the same time the congestion window is reset to a single max segment size. Thus, we initiate slow start until we start receiving acknowledgements again, at which point we can eventually flip over to congestion avoidance when cwnd ssthresh. Congestion control algorithms differ most in how they handle the other indication of congestion - duplicate ACKs. A duplicate ACK is a strong indication that data has been lost, since they often come from a receiver explicitly asking for a retransmission. In some cases, a duplicate ACK may be generated at the receiver as a result of packets arriving out-of-order, so it is sensible to wait for multiple duplicate ACKs before assuming packet loss rather than out-of-order delivery. This is termed fast retransmit (i.e. retransmit without waiting for the retransmission timer to expire). Note that on Oracle Solaris 11, the congestion control method used can be customized. See here for more details. In general, 3 or more duplicate ACKs indicate packet loss and should trigger fast retransmit . It's best not to revert to slow start in this case, as the fact that the receiver knew it was missing data suggests it has received data with a higher sequence number, so we know traffic is still flowing. Falling back to slow start would be excessive therefore, so fast recovery is used instead. Observing slow start and congestion avoidance The following script counts TCP segments sent when under slow start (cwnd ssthresh). #!/usr/sbin/dtrace -s #pragma D option quiet tcp:::connect-request / start[args[1]-cs_cid] == 0/ { start[args[1]-cs_cid] = 1; } tcp:::send / start[args[1]-cs_cid] == 1 && args[3]-tcps_cwnd tcps_cwnd_ssthresh / { @c["Slow start", args[2]-ip_daddr, args[4]-tcp_dport] = count(); } tcp:::send / start[args[1]-cs_cid] == 1 && args[3]-tcps_cwnd args[3]-tcps_cwnd_ssthresh / { @c["Congestion avoidance", args[2]-ip_daddr, args[4]-tcp_dport] = count(); } As we can see the script only works on connections initiated since it is started (using the start[] associative array with the connection ID as index to set whether it's a new connection (start[cid] = 1). From there we simply differentiate send events where cwnd ssthresh (congestion avoidance). Here's the output taken when I accessed a YouTube video (where rport is 80) and from an FTP session where I put a large file onto a remote system. # dtrace -s tcp_slow_start.d ^C ALGORITHM RADDR RPORT #SEG Slow start 10.153.125.222 20 6 Slow start 138.3.237.7 80 14 Slow start 10.153.125.222 21 18 Congestion avoidance 10.153.125.222 20 1164 We see that in the case of the YouTube video, slow start was exclusively used. Most of the segments we sent in that case were likely ACKs. Compare this case - where 14 segments were sent using slow start - to the FTP case, where only 6 segments were sent before we switched to congestion avoidance for 1164 segments. In the case of the FTP session, the FTP data on port 20 was predominantly sent with congestion avoidance in operation, while the FTP session relied exclusively on slow start. For the default congestion control algorithm - "newreno" - on Solaris 11, slow start will increase the cwnd by 1 MSS for every acknowledgement received, and by 1 MSS for each RTT in congestion avoidance mode. Different pluggable congestion control algorithms operate slightly differently. For example "highspeed" will update the slow start cwnd by the number of bytes ACKed rather than the MSS. And to finish, here's a neat oneliner to visually display the distribution of congestion window values for all TCP connections to a given remote port using a quantization. In this example, only port 80 is in use and we see the majority of cwnd values for that port are in the 4096-8191 range. # dtrace -n 'tcp:::send { @q[args[4]-tcp_dport] = quantize(args[3]-tcps_cwnd); }' dtrace: description 'tcp:::send ' matched 10 probes ^C 80 value ------------- Distribution ------------- count -1 | 0 0 |@@@@@@ 5 1 | 0 2 | 0 4 | 0 8 | 0 16 | 0 32 | 0 64 | 0 128 | 0 256 | 0 512 | 0 1024 | 0 2048 |@@@@@@@@@ 8 4096 |@@@@@@@@@@@@@@@@@@@@@@@@@@ 23 8192 | 0

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  • Excel 2007: Using a time to set XY chart axis scaling like in 2003

    - by CookieOfFortune
    In Excel 2003, when you created a XY chart using time as an axis, you could set the scaling of these axes by typing in the date. In Excel 2007, you have to use the decimal version of the time (eg. How many days since some arbitrary earlier date). I was wondering if there was a way to avoid having to make such a calculation? A developer posted on a blog that this issue would be fixed in a future release, but all versions of Excel 2007 I have tried have not resolved this issue. The relevant quote: Those of you familiar with this technique of converting time to a decimal may recall that Excel 2003 allowed you to enter a date and time like “1/1/07 11:00 AM” directly in the axis option min/max fields and Excel would calculate the appropriate decimal representation. This currently does not work in Excel 2007 but will be fixed in a subsequent release.

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  • How do I securely execute commands as root via a web control panel?

    - by Chris J
    I would like to build a very simple PHP based web based control panel to add and remove users to/from and add and remove sections to/from nginx config files on my linode vps (Ubuntu 8.04 LTS). What is the most secure way of executing commands as root based on input from a web based control panel? I am loathe to run PHP as root (even if behind an IP tables firewall) for the obvious reasons. Suggestions welcome. It must be possible as several commercial (and bloated, for my needs) control panels offer similar functionality. Thanks

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  • Changing Text in Visio Org Chart Shape Changes Multiple Shapes' Text

    - by Eric
    I have inherited an organizational chart that was created in Visio 2003. I am updating it with Visio 2007. When changing the text in one shape, such as a person's title, multiple shapes nearby change their text to the same. For example, if I change Bob's title from Programmer to Programmer/DBA then Wendy's text will change to "Bob - Programmer/DBA". Some changes update three or four other boxes. Some changes will only update one box. My thought is the originator copied or duplicated the one box to create multiple boxes and it created some type of link between them. How do I remove this link? Thanks!

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  • Manually "draw" data for chart, output to CSV

    - by Ambidex
    I need a service that will allow me to draw a chart line by hand and generate data points for what I drew. This might sound crazy, but I need some data (preferably in CSV output) that will only approximately show value X at time Y and I do not want to go and produce these values by hand. I only have to know how it will flow along. Anyone know how to actually accomplish this? So, I would actually want to draw a line on a graph, and then get the output (X + Y) from that line I drew in a (preferably) CSV.

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  • Using a time to set XY chart axis scaling like in 2003

    - by CookieOfFortune
    In Excel 2003, when you created a XY chart using time as an axis, you could set the scaling of these axes by typing in the date. In Excel 2007, you have to use the decimal version of the time (eg. How many days since some arbitrary earlier date). I was wondering if there was a way to avoid having to make such a calculation? A developer posted on a blog that this issue would be fixed in a future release, but all versions of Excel 2007 I have tried have not resolved this issue. The relevant quote: Those of you familiar with this technique of converting time to a decimal may recall that Excel 2003 allowed you to enter a date and time like “1/1/07 11:00 AM” directly in the axis option min/max fields and Excel would calculate the appropriate decimal representation. This currently does not work in Excel 2007 but will be fixed in a subsequent release.

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  • How do I fix the display of Windows 7's Control Panel?

    - by kez
    This has really bugged me since I took the plunge and upgraded to Windows 7. I think everything is great on the whole apart from the Control Panel. Instead of ordering from top to bottom like in normal folders, it is ordered from left to right. Whenever I go to find something in Control Panel it takes 3 times as long because I expect to find Programs and Features below Power Options yet it is to the right. This is a screenshot to demonstrate - note the ordering goes across instead of down. My question - does anyone have a cunning fix to display the Control Panel ordered in the same way that normal folders are displayed?

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  • Excel chart: How to reverse the X axis of time series data

    - by JohnnyLambada
    In Excel 2003, I have a time series from a financial report that goes something like this: 2007 2006 2005 Amount 300 200 100 I want to create a graph of the time series that looks something like this (please excuse the ugly ascii graph): 300| .x | ... 200| .x.. | ... 100| x |____________________ 0 2005 2006 2007 But intead of getting an upward sloping graph, excel wants to put my time series in reverse (the way it actually appears in the spreadsheet). Is there any way to make excel display the x axis in reverse of the way it normally does? I've tried manually reversing the range in the chart dialog (changing a range of B1:D3 to D3:B1), but excel just puts it back.

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  • What is a good alternative to the WPF WebBrowser Control?

    - by VoidDweller
    I have an MDI WPF app that I need to add web content to. At first, great it looks like I have 2 options built into the framework the Frame control and the WebBrowser control. Given that this is an MDI app it doesn't take long to discover that neither of these will work. The WPF WebBrowser control wraps up the IE WebBrowser ActiveX Control which uses the Win32 graphics pipeline. The "Airspace" issue pretty much sums this up as "Sorry, the layouts will not play nice together". Yes, I have thought about taking snapshots of the web content rendering these and mapping the mouse and keyboard events back to the browser control, but I can't afford the performance penalty and I really don't have time to write and thoroughly test it. I have looked for third party controls, but so far I have only found Chris Cavanagh's WPF Chromium Web Browser control. Which wraps up Awesomium 1.5. Together these are very cool, they play nice with the WPF layouts. But they do not meet my performance requirements. They are VERY HEAVY on memory consumption and not to friendly with CPU usage either. Not to mention still quite buggy. I'll elaborate if you are interested. So, do any of you know of a stable performant WPF web browser control? Thanks.

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  • C# WebBrowser Control - ignore website security warnings

    - by Ramsey
    I'm currently using WebBrowser (System.Windows.Forms) in my program. When I try to access some websites over https, the message "There is a problem with your websites security certificate" appears. Is there any way I can get WebBrowser to ignore these types of warnings? There are solutions for WebClient: How to ignore a certificate error with c# 2.0 WebClient - without the certificate But those solutions do not apply to this problem, as WebBrowser seems to ignore whatever is set in ServicePointManager.

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  • Webbrowser control: auto fill textfields

    - by Khou
    I would like my custom browser to auto fill in a form when it is completely loaded Ok so inside private void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e) { } Ive inserted the following statements webBrowser1.Document.GetElementById("FirstName").SetAttribute("value", "John"); webBrowser1.Document.GetElementById("LastName").SetAttribute("value", "Smith"); // etc..etc.. I noticed that "webBrowser1_DocumentCompleted" only is loaded one time?? How do i make my browser auto fill in a form when the document has finish loading, and auto fill the values to the define values if they have been changed by the end user.

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  • What version control tool can generate this header

    - by Stan
    This is from a sql script. What tool can generate this? Thanks --USE [MY_TABLE] GO /****** Object: StoredProcedure [dbo].[adminIncExp] Script Date: 03/05/2010 09:14:12 ******/ SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO -- ============================================= -- Author: <Author,,Name> -- Create date: <Create Date,,> -- Description: <Description,,> -- =============================================

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  • Webbrowser control: Get text value from html text

    - by Khou
    The web browser has the following displayed content, within a html table. [Element] [Value] Name John Smith Email [email protected] We know that the value of the elements are on to the right of the element and they are both on the same line (this is how it appears on the screen but in the html code it might not appear like this). How do you get the values of element name and element email? (first remove all html tag? then somehow use regular express to get the values? or figure out how to use html agility pack?)

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  • C# Webbrowser control - Defining document loaded

    - by Sani
    Hi DocumentCompleted will work after all dom elements loaded (images, flash and etc.). And I am waiting when all dom elements are downloaded to work this document. How can I define when documnet (page) loaded (when client see the page)? Is there any event to define when document LOADED to client?

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  • Best Role-Based Access Control (RBAC) database model

    - by jhs
    What is the best database schema to track role-based access controls for a web application? I am using Rails, but the RBAC plugin linked by Google looks unmaintained (only 300 commits to SVN; latest was almost a year ago). The concept is simple enough to implement from scratch, yet complex and important enough that it's worth getting right. So how do others architect and implement their RBAC model?

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  • WPF Control Background under GridViewColumn

    - by sergo_lsn
    Hi, I'd like make background for colums like in this image http://www.freeimagehosting.net/image.php?e2435df982.png I have CheckBoxes on the left and TreeView on the right. In one column I have checkboxes in other I have treeview. In column with checkboxes I need set background. Background has to be permanent. .... </DataTemplate> </GridViewColumn.CellTemplate> </GridViewColumn> <GridViewColumn Width="25"> All column has to have background not only cell <GridViewColumn.CellTemplate> <DataTemplate> <CheckBox> <CheckBox.Resources> <ResourceDictionary> <ResourceDictionary.MergedDictionaries> .... </ResourceDictionary.MergedDictionaries> </ResourceDictionary> </CheckBox.Resources> </CheckBox> </DataTemplate> </GridViewColumn.CellTemplate> </GridViewColumn> </GridViewColumn> <GridViewColumn Width="300"/> </TreeListView.Columns> <TreeListView.Resources> <ResourceDictionary> <ResourceDictionary.MergedDictionaries> ... TreeView.xaml </ResourceDictionary.MergedDictionaries> </ResourceDictionary> </TreeListView.Resources> <TreeListView.ItemTemplate> <HierarchicalDataTemplate> <HierarchicalDataTemplate.ItemsSource> .... </HierarchicalDataTemplate.ItemsSource> </HierarchicalDataTemplate> </TreeListView.ItemTemplate> </TreeListView>

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  • Simple Inversion of Control framework for Java/Scala

    - by Alexey Romanov
    I am looking for a simple to use IoC container for GUI applications written in Java/Scala. It should support Convention over Configuration, lifecycle management, configuration in code (preferably without any XML needed at all), and checking dependencies at compile-time as much as possible. Something similar to Autofac would be perfect.

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  • Two Way Data Binding With a Object in WPF,Image Control

    - by Candy
    Sorry, my English is not very good, I have a object "Stuffs" "Stuffs" have a Property “Icon” now: xaml <Button Click="Button_Click"><Image Width="80" Height="80" Source="{Binding Path=Icon,Converter={StaticResource ImageConverter}}"/></Button> cs private void Button_Click(object sender, RoutedEventArgs e) { IconFloder.Title = "Icon"; String IconFloderPath = AppDomain.CurrentDomain.BaseDirectory + ItemIconFloder; if (!System.IO.Directory.Exists(IconFloderPath)) System.IO.Directory.CreateDirectory(IconFloderPath); IconFloder.InitialDirectory = IconFloderPath; IconFloder.Filter = "Image File|*.jpeg"; IconFloder.ValidateNames = true; IconFloder.CheckPathExists = true; IconFloder.CheckFileExists = true; if (IconFloder.ShowDialog() == true) { HideImage.Text = ItemIconFloder + "\\" + IconFloder.SafeFileName; ((sender as Button).Content as Image).Source = new ImageConverter().Convert(ItemIconFloder + "\\" + IconFloder.SafeFileName, Type.GetType("System.Windows.Media.ImageSource"), null, new System.Globalization.CultureInfo("en-US")) as ImageSource; } } class ImageConverter:IValueConverter { public object Convert(object value, Type targetType, object parameter, CultureInfo culture) { if (value is string&&!String.IsNullOrEmpty(value.ToString())) { try { return new BitmapImage(new Uri(AppDomain.CurrentDomain.BaseDirectory + value)); } catch { } } return null; } public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) { throw new NotImplementedException(); } } I would like to click buttons, change the picture, Also change Data Binding Stuffs.Icon But failed,I have no idea?I need help? I do not know whether I speak clearly

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  • Does PHP have job control like bash does?

    - by Andrew
    Hello, does PHP support something like ampersand in bash (forking)? Let's say I wanted to use cURL on 2 web pages concurrently, so script doesn't have to wait before first cURL command finnishes, how could one achieve that in PHP? Something like this in bash: curl www.google.com & curl www.yahoo.com & wait

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  • ReSharper Code Cleanup/Reformat Code feature vs Versioning Control Systems

    - by Romain Verdier
    ReSharper Code cleanup feature (with "reorder members" and "reformat code" enabled) is really great. You define a layout template using XML, then a simple key combination reorganizes your whole source file (or folder/project/solution) according to the rules you set in the template. Anyway, do you think that could be a problem regarding VCS like subversion, cvs, git, etc. ? Is there a chance that it causes many undesired conflicts ? Thank you.

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  • Help create a unit test for test response header, specifically Cache-Control, in determining if cach

    - by VajNyiaj
    Scenario: I have a base controller which disables caching within the OnActionExecuting override. protected override void OnActionExecuting(ActionExecutingContext filterContext) { filterContext.HttpContext.Response.Cache.SetExpires(DateTime.UtcNow.AddDays(-1)); filterContext.HttpContext.Response.Cache.SetValidUntilExpires(false); filterContext.HttpContext.Response.Cache.SetRevalidation(HttpCacheRevalidation.AllCaches); filterContext.HttpContext.Response.Cache.SetCacheability(HttpCacheability.NoCache); //IE filterContext.HttpContext.Response.Cache.SetNoStore(); //FireFox } How can I create a Unit Test to test this behavior?

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