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• How to remotely connect to jmx on tomcat using ssh tunnelling and not break ehcache...

  - by Unsavory

  I've followed the instructions in the following link to create my own RMI registry and jmx server on a single port inside tomcat. According to the comments, I need to set -Djava.rmi.server.hostname=localhost. Once I do that, I can indeed connect to my server via jconsole using ssh port forwarding. http://blogs.sun.com/jmxetc/entry/connecting_through_firewall_using_jmx However, I've found it has the very bad side affect of breaking our ehcache replication which uses RMI. It fails complaining that it cannot bootstrap from remote peer localhost. I'm guessing because the peers all have their rmi server hostname set to localhost from setting -Djava.rmi.server.hostname=localhost. Does anyone have a possible workaround to this problem?

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• Creating a Wiki site in SharePoint 2010

  - by Ben

  I have a SharePoint 2010 site set up and would like to add a Wiki site to it. Normally, to add a subsite to a parent site you would click "Site Actions" - "New Site" and choose the site type (e.g. Team Site) and it would work fine. In the case of adding a Wiki site, I choose "Enterprise Wiki", and get "Error An Unexpected Error has occured Correlation Id:...". So i took the CorrelationId and checked in the ULS files to see what the error is, and the first bad sign seems to be: SharePoint Foundation Feature Infrastructure " The element of type 'ContentTypeBinding' for feature 'EnterpriseWiki' (id: 76d688ad-c16e-4cec-9b71-7b7f0d79b9cd) threw an exception during activation: Specified argument was out of the range of valid values. Parameter name: Content type not found (Id: '0x010100C568DB52D9D0A14D9B2FDCC96666E9F2007948130EC3DB064584E219954237AF39004C1F8B46085B4D22B1CDC3DE08CFFB9C')." There are more errors in the log, but this seems to be the first one. Any ideas on whats going on? Thanks

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• jQuery UI Dialog Button Icons

  - by Cory Grimster

  Is it possible to add icons to the buttons on a jQuery UI Dialog? I've tried doing it this way: $("#DeleteDialog").dialog({ resizable: false, height:150, modal: true, buttons: { 'Delete': function() { /* Do stuff */ $(this).dialog('close'); }, Cancel: function() { $(this).dialog('close'); } }, open: function() { $('.ui-dialog-buttonpane').find('button:contains("Cancel")').addClass('ui-icon-cancel'); $('.ui-dialog-buttonpane').find('button:contains("Delete")').addClass('ui-icon-trash'); } }); The selectors in the open function seem to be working fine. If I add the following to "open": $('.ui-dialog-buttonpane').find('button:contains("Delete")').css('color', 'red'); then I do get a Delete button with red text. That's not bad, but I'd really like that little trash can sprite on the Delete button as well.

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• Google Charts Through CURL

  - by swt83

  I have a PHP class that helps me generate URLs for custom charts using Google Chart service. These URLs work fine when I load them in my browser, but I'm trying to pull them using CURL so I can access the charts on secure https websites. Whenever I try and pull a chart via CURL, I get an Error 400 Bad Request. Any idea on how to get around this? Everything I have tried has failed. $url = urldecode($_GET['url']); $session = curl_init($url); // Open the Curl session curl_setopt($session, CURLOPT_HEADER, false); // Don't return HTTP headers curl_setopt($session, CURLOPT_RETURNTRANSFER, true); // Do return the contents of the call $image = curl_exec($session); // Make the call #header("Content-Type: image/png"); // Set the content type appropriately curl_close($session); // And close the session die($image);

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• How to return a MVC View to a $.Ajax JSON POST

  - by flascuba

  I am sending a $.Ajax POST to a MVC Controller function with parameters and returning a JasonResult successfully. What I need to happen is that the current View be returned (as if it was not a JSON request and I was returning the Viewdata). The Viewdata has been updated and the page needs to be redrawn. In short, I want the MVC Action to respond back to the $Ajax request correctly, and then have the page redrawn using the updated Viewdata. Hope this makes sense, coming down with a bad cold.

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• OpenSwan IPsec connection drops after 30 seconds

  - by drcore

  I'm trying to connection from my Linux Mint 16 box to a CloudStack server. Building up the connection works (pings work across the tunnel). However 30 seconds later the IPsec tunnel gets terminated out of the blue. What could cause this consistent behaviour and how to fix it? The tunnel is setup using OpenSwan (U2.6.38/K(no kernel code presently loaded)) with the L2TP IPsec VPN manager from Werner Jaeger 1.0.9. The client is behind a NAT'ed router and the server is on public IP (CloudStack 4.2) Running ipsec verify complains about IPsec support in kernel. Not sure if this is a problem as the connection is being build up: Checking your system to see if IPsec got installed and started correctly: Version check and ipsec on-path [OK] Linux Openswan U2.6.38/K(no kernel code presently loaded) Checking for IPsec support in kernel [FAILED] SAref kernel support [N/A] Checking that pluto is running [FAILED] whack: Pluto is not running (no "/var/run/pluto/pluto.ctl") Checking for 'ip' command [OK] Checking /bin/sh is not /bin/dash [WARNING] Checking for 'iptables' command [OK] Opportunistic Encryption Support [DISABLED] Tunnel config: version 2.0 # conforms to second version of ipsec.conf specification config setup # plutodebug="parsing emitting control private" plutodebug=none strictcrlpolicy=no nat_traversal=yes interfaces=%defaultroute oe=off # which IPsec stack to use. netkey,klips,mast,auto or none protostack=netkey conn %default keyingtries=3 pfs=no rekey=yes type=transport left=%defaultroute leftprotoport=17/1701 rightprotoport=17/1701 conn Tunnel1 authby=secret right=37.48.75.97 rightid="" auto=add Log file of VPN connection build up: aug. 23 17:12:54.708 ipsec_setup: Starting Openswan IPsec U2.6.38/K3.11.0-12-generic... aug. 23 17:12:55.155 ipsec_setup: multiple ip addresses, using 192.168.178.32 on eth0 aug. 23 17:12:55.165 ipsec__plutorun: Starting Pluto subsystem... aug. 23 17:12:55.174 ipsec__plutorun: adjusting ipsec.d to /etc/ipsec.d aug. 23 17:12:55.177 recvref[30]: Protocol not available aug. 23 17:12:55.177 xl2tpd[14339]: This binary does not support kernel L2TP. aug. 23 17:12:55.178 Starting xl2tpd: xl2tpd. aug. 23 17:12:55.178 xl2tpd[14345]: xl2tpd version xl2tpd-1.3.1 started on desktopmint PID:14345 aug. 23 17:12:55.178 xl2tpd[14345]: Written by Mark Spencer, Copyright (C) 1998, Adtran, Inc. aug. 23 17:12:55.179 xl2tpd[14345]: Forked by Scott Balmos and David Stipp, (C) 2001 aug. 23 17:12:55.179 xl2tpd[14345]: Inherited by Jeff McAdams, (C) 2002 aug. 23 17:12:55.179 xl2tpd[14345]: Forked again by Xelerance (www.xelerance.com) (C) 2006 aug. 23 17:12:55.180 xl2tpd[14345]: Listening on IP address 0.0.0.0, port 1701 aug. 23 17:12:55.214 ipsec__plutorun: 002 added connection description "Tunnel1" aug. 23 17:13:15.532 104 "Tunnel1" #1: STATE_MAIN_I1: initiate aug. 23 17:13:15.532 003 "Tunnel1" #1: ignoring unknown Vendor ID payload [4f45755c645c6a795c5c6170] aug. 23 17:13:15.532 003 "Tunnel1" #1: received Vendor ID payload [Dead Peer Detection] aug. 23 17:13:15.533 003 "Tunnel1" #1: received Vendor ID payload [RFC 3947] method set to=115 aug. 23 17:13:15.533 106 "Tunnel1" #1: STATE_MAIN_I2: sent MI2, expecting MR2 aug. 23 17:13:15.534 003 "Tunnel1" #1: NAT-Traversal: Result using draft-ietf-ipsec-nat-t-ike (MacOS X): i am NATed aug. 23 17:13:15.534 108 "Tunnel1" #1: STATE_MAIN_I3: sent MI3, expecting MR3 aug. 23 17:13:15.534 010 "Tunnel1" #1: STATE_MAIN_I3: retransmission; will wait 20s for response aug. 23 17:13:15.545 003 "Tunnel1" #1: received Vendor ID payload [CAN-IKEv2] aug. 23 17:13:15.547 004 "Tunnel1" #1: STATE_MAIN_I4: ISAKMP SA established {auth=OAKLEY_PRESHARED_KEY cipher=aes_128 prf=oakley_sha group=modp2048} aug. 23 17:13:15.547 117 "Tunnel1" #2: STATE_QUICK_I1: initiate aug. 23 17:13:15.547 010 "Tunnel1" #2: STATE_QUICK_I1: retransmission; will wait 20s for response aug. 23 17:13:15.548 004 "Tunnel1" #2: STATE_QUICK_I2: sent QI2, IPsec SA established transport mode {ESP=>0x0ecef28b <0x3e1fbe3b xfrm=AES_128-HMAC_SHA1 NATOA=none NATD=none DPD=none} aug. 23 17:13:16.549 xl2tpd[14345]: Connecting to host <VPN gateway>, port 1701 aug. 23 17:13:18.576 xl2tpd[14345]: Connection established to <VPN gateway>, 1701. Local: 21163, Remote: 12074 (ref=0/0). aug. 23 17:13:18.576 xl2tpd[14345]: Calling on tunnel 21163 aug. 23 17:13:18.577 xl2tpd[14345]: check_control: Received out of order control packet on tunnel 12074 (got 0, expected 1) aug. 23 17:13:18.577 xl2tpd[14345]: handle_packet: bad control packet! aug. 23 17:13:18.577 xl2tpd[14345]: check_control: Received out of order control packet on tunnel 12074 (got 0, expected 1) aug. 23 17:13:18.577 xl2tpd[14345]: handle_packet: bad control packet! aug. 23 17:13:18.599 xl2tpd[14345]: Call established with <VPN gateway>, Local: 39035, Remote: 57266, Serial: 1 (ref=0/0) aug. 23 17:13:18.605 xl2tpd[14345]: start_pppd: I'm running: aug. 23 17:13:18.605 xl2tpd[14345]: "/usr/sbin/pppd" aug. 23 17:13:18.606 xl2tpd[14345]: "passive" aug. 23 17:13:18.606 xl2tpd[14345]: "nodetach" aug. 23 17:13:18.606 xl2tpd[14345]: ":" aug. 23 17:13:18.606 xl2tpd[14345]: "file" aug. 23 17:13:18.606 xl2tpd[14345]: "/etc/ppp/Tunnel1.options.xl2tpd" aug. 23 17:13:18.606 xl2tpd[14345]: "ipparam" aug. 23 17:13:18.607 xl2tpd[14345]: "<VPN gateway>" aug. 23 17:13:18.607 xl2tpd[14345]: "/dev/pts/4" aug. 23 17:13:18.607 pppd[14438]: Plugin passprompt.so loaded. aug. 23 17:13:18.607 pppd[14438]: pppd 2.4.5 started by root, uid 0 aug. 23 17:13:18.608 pppd[14438]: Using interface ppp0 aug. 23 17:13:18.608 pppd[14438]: Connect: ppp0 <--> /dev/pts/4 aug. 23 17:13:21.650 pppd[14438]: CHAP authentication succeeded: Access granted aug. 23 17:13:21.651 pppd[14438]: CHAP authentication succeeded aug. 23 17:13:21.692 pppd[14438]: local IP address 10.1.2.2 aug. 23 17:13:21.693 pppd[14438]: remote IP address 10.1.2.1 aug. 23 17:13:21.693 pppd[14438]: primary DNS address 10.1.2.1 aug. 23 17:13:21.694 pppd[14438]: secondary DNS address 10.1.2.1 aug. 23 17:13:46.528 Stopping xl2tpd: xl2tpd. aug. 23 17:13:46.528 xl2tpd[14345]: death_handler: Fatal signal 15 received aug. 23 17:13:46.529 pppd[14438]: Modem hangup aug. 23 17:13:46.529 pppd[14438]: Connect time 0.5 minutes. aug. 23 17:13:46.529 pppd[14438]: Sent 1866 bytes, received 1241 bytes. aug. 23 17:13:46.529 pppd[14438]: Connection terminated. aug. 23 17:13:46.562 ipsec_setup: Stopping Openswan IPsec... aug. 23 17:13:46.576 pppd[14438]: Exit.

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• iphone how to remove modal uiviewcontroller from memory

  - by Scott Pendleton

  I have a root UIViewController which has a property called webView. WebView is a UIViewController with a XIB that contains a UIWebView. From my root view I modally (is there any other way?) load the webView ViewController and set its URL, always to the same page. I discovered that if, after loading the webView, I used its default Web page to navigate to another Web page, and then closed the webView and returned to the root controller -- AND THEN reopened the webView, that the webView was not showing the default page but rather the page I navigated to, which means the webView ViewController never got destroyed and removed from memory. This strikes me as very bad. So in the root ViewController, I added this code under viewWillAppear:animated -- if (self.webView != nil) { self.webView = nil) } Is that sufficient? Is there a better way?

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• How to call windows authentication programmatically in sharepoint?

  - by HamdiKavak

  Hi guys, Here is my scenario. When anonymous user visits site collection's default site, custom login form panel is shown. This form is a webUserControl(.ascx file) that is embeded into page as webpart. Then user enters username and password. When submit button has been clicked, authentication will be handled by code behind of custom login form panel. Here is my question. How can I call SharePoint's authentication method with the username and password that is entered by user. Simply, I want users to login through my custom login form panel because default windows authentication window is looking really bad.

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• awk and cat - How to ignore multiple lines?

  - by Filipe YaBa Polido

  I need to extract Voip log from a D-Link router, so I've setup a little python script that executes a command in this router via telnet. My script does a "cat /var/log/calls.log" and returns the result, however... it also sends non-important stuff, like the BusyBox banner, etc... How can I ignore lines from 1 to 6 and the last 2 ? This is my current output: yaba@foobar:/stuff$ python calls.py BusyBox v1.00 (2009.04.09-11:17+0000) Built-in shell (msh) Enter 'help' for a list of built-in commands. DVA-G3170i/PT # cat /var/call.log 1 ,1294620563,2 ,+351xxx080806 ,xxx530802 ,1 ,3 ,1 DVA-G3170i/PT # exit And I just need: 1 ,1294620563,2 ,+351xxx080806 ,xxx530802 ,1 ,3 ,1 (it can have multiple lines) So that I can save it to a CSV and later to a sql db. Thanks, and sorry my bad english.

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• Is AlarmManager.setRepeating idempotent?

  - by tardate

  In my android app, I'm setting an alarm that I want to occur repeatedly, hence using AlarmManager.setRepeating(). I don't want to keep track of whether the alarm is set myself (sounds like a bad idea that's prone to fail at some point), and there seems to be no API support for checking whether a particular alarm is already set for a given Intent. Hence, I am pessimistically resetting the alarm each time my app activates: alarmManager.cancel(pendingIntent); ... alarmManager.setRepeating(..., pendingIntent); Question: is calling setRepeating() idempotent i.e. do I need to explicitly cancel() any prior alarm or can I safely just call setRepeating() and be done with it?

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• [PHP] Sanitizing strings to make them URL and filename safe?

  - by Xeoncross

  I am trying to come up with a function that does a good job of sanitizing certain strings so that they are safe to use in the URL (like a post slug) and also safe to use as file names. For example, when someone uploads a file I want to make sure that I remove all dangerous characters from the name. So far I have come up with the following function which I hope solves this problem and also allows foreign UTF-8 data also. /** * Convert a string to the file/URL safe "slug" form * * @param string $string the string to clean * @param bool $is_filename TRUE will allow additional filename characters * @return string */ function sanitize($string = '', $is_filename = FALSE) { // Replace all weird characters with dashes preg_replace('/[^\w\-'. ($is_filename ? '*~_\.' : ''). ']+/u', '-', $string); // Only allow one dash separator at a time (and make string lowercase) return mb_strtolower(preg_replace('/--+/u', '-', $string), 'UTF-8'); } Does anyone have any tricky sample data I can run against this - or know of a better way to safeguard our apps from bad names?

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• Why is WPFToolkit DataGrid so slow when binding?

  - by Schneider

  I have a very simple test application where I have two objects, each with a small collection of items. when I select an object I display its collection in a WPFToolkit DataGrid. The problem is there is a noticeable delay, such that if you press up/down keys to toggle selection between objects you can see it can't keep up. Why is the performance so bad? <Window x:Class="SlowGridBinding.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:Controls="clr-namespace:Microsoft.Windows.Controls;assembly=WPFToolkit" Title="MainWindow" Height="350" Width="525"> <StackPanel> <ListBox ItemsSource="{Binding Shops}" DisplayMemberPath="Name" IsSynchronizedWithCurrentItem="True"/> <Controls:DataGrid ItemsSource="{Binding Shops/Vegetables}" AutoGenerateColumns="True"/> </StackPanel> The DataContext is populated with some test classes filled with 50 items of random test data.

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• Push DVCS repository to master without needing codebase

  - by Scorchin

  To work on a client's staging environment I have to connect through a VPN which locks all normal network traffic and prevents any connection to the Internet. This would immediately prevent any of the "normal" VCS solutions from being used as it's not possible to gain access to the server. A solution to this would be to create a DVCS repository (git?) locally and then push changes to the master, as and when needed. There is one flaw in this plan. The entire codebase is around 14GB. To download all of this over the internet would take some time, especially when I'm likely to be working on 3 or 4 different machines in each case. This seems silly and overkill for a DVCS. TL;DR Can any DVCS solution allow you to push to a master server/repo without needing the codebase? Bad example: copy the .git folder (not the 14GB codebase) to another directory and push this to the master once disconnected from the VPN.

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• WPF assign Z-Order of owned windows without changing focus.

  - by Kamiikoneko

  Hi, Due to OpenGL airspace issues I have several windows that are owned by the main window but look and act like controls. I also have some data readout/sort windows that show real-time data and need to be normal floating windows, also owned by the main window so that they remain floating above the main window even while operations are performed in the main window. The issue: I open a data readout window (normal window) and am watching data change. Then I click on a text box to enter a value in one of the windows that acts as a control due to airspace issues, and it becomes activated, covering up my data readout window. This is bad because the airspace window is supposed to act like it is part of the main window. I tried some tricks with Activation and Deactivation, and it looks ok but then editing the airspace window at all is impossible because WPF only lets me edit the activated window. How can I ask that normal data readout window to please stay above all other windows owned by the main window, but still let other windows receive focus?

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• wampserver installation

  - by Diego

  Hi. I'm trying to install wampserver on my windows xp pc. It is throwing this error: C:\wamp\wampmanager.exe An error occurred while trying to rename a file in the destination directory: MoveFile failed; code 2. El sistema no puede hallar el archivo especificado. Click Retry to try again, Ignore to skip this file (not recommended), or Abort to cancel installation. First time on this error I tried to retry but it threw the error again and again. If I decide to ignore, then the installation finishes and all the files are correct but the exe to open wampserver. I tried to copy from one pc to other and I couldn't event paste it in the destination folder. Please healp me. Sorry for my bad english and thank you in advance

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• How to get Java Decompiler / JD / JD-Eclipse running in Eclipse Helios

  - by Universalspezialist

  Java Decompiler (JD) is generally recommended as a good, well, Java Decompiler. JD-Eclipse is the Eclipse plugin for JD. I had problems on several different machines to get the plugin running. Whenever I tried to open a .class file, the standard "Source not found" editor would show, displaying lowlevel bytecode disassembly, not the Java source output you'd expect from a decompiler. Installation docs in http://java.decompiler.free.fr/?q=jdeclipse are not bad but quite vague when it comes to troubleshooting. Opening this question to collect additional information: What problems did you encounter before JD was running in Eclipse Helios? What was the solution?

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• fastest calculation of largest prime factor of 512 bit number in python

  - by miraclesoul

  dear all, i am simulating my crypto scheme in python, i am a new user to it. p = 512 bit number and i need to calculate largest prime factor for it, i am looking for two things: Fastest code to process this large prime factorization Code that can take 512 bit of number as input and can handle it. I have seen different implementations in other languages, my whole code is in python and this is last point where i am stuck. So let me know if there is any implementation in python. Kindly explain in simple as i am new user to python sorry for bad english.

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• Visual C#, Large Arrays, and LOH Fragmentation. What is the accepted convention?

  - by Gorchestopher H

  I have an other active question HERE regarding some hopeless memory issues that possibly involve LOH Fragmentation among possibly other unknowns. What my question now is, what is the accepted way of doing things? If my app needs to be done in Visual C#, and needs to deal with large arrays to the tune of int[4000000], how can I not be doomed by the garbage collector's refusal to deal with the LOH? It would seem that I am forced to make any large arrays global, and never use the word "new" around any of them. So, I'm left with ungraceful global arrays with "maxindex" variables instead of neatly sized arrays that get passed around by functions. I've always been told that this was bad practice. What alternative is there? Is there some kind of function to the tune of System.GC.CollectLOH("Seriously") ? Are there possibly some way to outsource garbage collection to something other than System.GC? Anyway, what are the generally accepted rules for dealing with large (85Kb) variables?

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• Date object to Calendar [Java]

  - by Samuel

  Hello World, I have a class Movie in it i have a start Date, a duration and a stop Date. Start and stop Date are Date Objects (private Date startDate ...) (It's an assignment so i cant change that) now i want to automatically calculate the stopDate by adding the duration (in min) to the startDate. By my knowledge working with the time manipulating functions of Date is deprecated hence bad practice but on the other side i see no way to convert the Date object to a calendar object in order to manipulate the time and reconvert it to a Date object. Is there a way? And if there is what would be best practice Thanks in advance Samuel

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• How to return model state from child action handler in ASP.NET MVC

  - by Joe Future

  In my blog engine, I have one controller action that displays blog content, and in that view, I call Html.RenderAction(...) to render the "CreateComment" form. When a user posts a comment, the post is handled by the comment controller (not the blog controller). If the comment data is valid, I simply return a Redirect back to the blog page's URL. If the comment data is invalid (e.g. comment body is empty), I want to return the ViewData with the error information back to the blog controller and through the blog view to the CreateComment action/view so I can display which fields are bad. I have this working fine via AJAX when Javascript is enabled, but now I'm working on the case where Javascript might be disabled. If I return a RedirecToAction or Redirect from the comment controller, the model state information is lost. Any ideas?

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• Does it make sense to use a NSFetchedResultsController without an UITableViewController? How are the

  - by dontWatchMyProfile

  I mean... could I also just create a plain old UIViewController and then set up a UITableView myself, plus an NSFetchedResultsController? How much do UITableViewController and NSFetchedResultsController interact with eachother? As far as I see it, UITableViewController is NOT by default already adopting the NSFetchedResultsControllerDelegate protocol. It almost looks like if UITableViewController has been developed without knowing about NSFetchedResultsController. Probably they even did that before developing FRC. Anyways, just a raw guess because the UITableViewController lacks of mentioning FRC at all. So the only thing I see in UITableViewController is that it is already the delegate for a UITableView by adopting the protocol, and it sets up the UITableView instance for me and assigns it internally to it's tableView property. Is that the whole magic of UITableViewController? (note: the nsfetchedresultscontrolle tag is not a typo. SO has a limit for the num of chars...too bad for that missing r, that's why I avoided this tag in my other buch of questions like the plague)

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• Slow select when inserting large amounts of data (MYSQL)

  - by siannopollo

  I have a process that imports a lot of data (950k rows) using inserts that insert 500 rows at a time. The process generally takes about 12 hours, which isn't too bad. Normally doing a query on the table is pretty quick (under 1 second) as I've put (what I think to be) the proper indexes in place. The problem I'm having is trying to run a query when the import process is running. It is making the query take almost 2 minutes! What can I do to make these two things not compete for resources (or whatever)? I've looked into "insert delayed" but not sure I want to change the table to MyISAM. Thanks for any help!

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• Opinions on sensor / reading / alert database design

  - by Mark

  I've asked a few questions lately regarding database design, probably too many ;-) However I beleive I'm slowly getting to the heart of the matter with my design and am slowly boiling it down. I'm still wrestling with a couple of decisions regarding how "alerts" are stored in the database. In this system, an alert is an entity that must be acknowledged, acted upon, etc. Initially I related readings to alerts like this (very cut down) : - [Location] LocationId [Sensor] SensorId LocationId UpperLimitValue LowerLimitValue [SensorReading] SensorReadingId Value Status Timestamp [SensorAlert] SensorAlertId [SensorAlertReading] SensorAlertId SensorReadingId The last table is associating readings with the alert, because it is the reading that dictate that the sensor is in alert or not. The problem with this design is that it allows readings from many sensors to be associated with a single alert - whereas each alert is for a single sensor only and should only have readings for that sensor associated with it (should I be bothered that the DB allows this though?). I thought to simplify things, why even bother with the SensorAlertReading table? Instead I could do this: [Location] LocationId [Sensor] SensorId LocationId [SensorReading] SensorReadingId SensorId Value Status Timestamp [SensorAlert] SensorAlertId SensorId Timestamp [SensorAlertEnd] SensorAlertId Timestamp Basically I'm not associating readings with the alert now - instead I just know that an alert was active between a start and end time for a particular sensor, and if I want to look up the readings for that alert I can do. Obviously the downside is I no longer have any constraint stopping me deleting readings that occurred during the alert, but I'm not sure that the constraint is neccessary. Now looking in from the outside as a developer / DBA, would that make you want to be sick or does it seem reasonable? Is there perhaps another way of doing this that I may be missing? Thanks. EDIT: Here's another idea - it works in a different way. It stores each sensor state change, going from normal to alert in a table, and then readings are simply associated with a particular state. This seems to solve all the problems - what d'ya think? (the only thing I'm not sure about is calling the table "SensorState", I can't help think there's a better name (maybe SensorReadingGroup?) : - [Location] LocationId [Sensor] SensorId LocationId [SensorState] SensorStateId SensorId Timestamp Status IsInAlert [SensorReading] SensorReadingId SensorStateId Value Timestamp There must be an elegant solution to this!

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• Best practice to handle Parent Form Child Form relation using Presentation Model

  - by Rajarshi

  According to Presentation Model notes by Martin Fowler and also on MSDN documentation about Presentation Model, it is explained that the Presentation Model Class should be unaware of the UI class and similarly Business Model Class should be unaware of the Presentation Model class. The UI should databind extensively to the Presentation Model, the Presentation Model in turn will co-ordinate with one or more Domain/Business Model objects to get the job done. The Presentation Model basically presents the Domain Model data in a way to facilitate maximum data binding in UI, allowing the UI take as less decisions as possible and thus increase testability of Presentation behaviours. This also makes the presentation model class generic, i.e. agnostic of any particular UI technology. Now, consider there is a List form (say CustomerList) and there is another Root form (say Customer) and there is a Use Case of allowing to Edit a Customer from the CustomerList form on a button click. For simplicity of discussion, consider that some actions took place when Customer List is opened from menu (i.e. Customer menu clicked) and the Customer List has been shown from the Menu click event. Now as per the above Use Case, I need to open the Customer Root UI (single Customer) from the Customer List. How do I do that? Build necessary objects (BusinessModel, PresentationModel, UI) in click event of Edit button and call CustomerEdit UI from there? Build the CustomerEdit UI from Presentation Model Class and show UI from presentation model? this can be done in any of the two ways below - a. Create objects in the following sequence DomainModel-PresentationModel-UIForm b. Use Unity.Resolve(); Either ways, Presentation Model is violated as the P model now has to the refer the concrete UI assembly, where CustomerEdit is located. Also the P Model has to refer and use a WinForm directly making it less UI technology agnostic. Even though the violations are in theory and can be ignored, I would still seek the community's opinion about whether I am going wrong direction. Please suggest if there's a better way to call the Child Form from the List (Parent) Form. Rajarshi

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• IP Address Lookup in VB.net (XP vs Windows 7)

  - by TheHockeyGeek

  Currently I use the following code to retrieve the IP address of the local workstation... strIPAddress = System.Net.Dns.GetHostEntry(strComputerName).AddressList(0).ToString() This is fine for the Windows XP workstations. However, in Vista and Windows 7, this returns the IPv6 address which is not used at all. Is there a method of setting this to work so it always returns the IPv4 address regardless of platform? I know I can increment the AddressList value to 1 and get the correct IP in Windows 7. The bad part is that this requires going through the motions of identifying the OS and choosing one or the other. The must be some way of specifying IPv4 only. Perhaps getting a result from DNS on the network rather than the workstation itself?

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