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• What is the best way to use EF 4 and DDD

  - by William

  I would like to use EFf 4 as my ORM in my DDD project. I am going to generate my model based on my classes. Should I create classes that are basically dto objects for my business objects to consumer or should I implement the actuall BO classes in my EF model?

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• When to use a user defined Exception and some good examples/best Practices?

  - by Atomiton

  I would assume that most User-defined Exceptions are for Business Logic level exceptions, but what are some good reasons to use a User-Defined Exception and what are some good examples? Is a user-defined exception's only advantage that you can define a consistent Error Message? What logic can be written inside exceptions to make them truly more useful? After all, can't you just do this: throw new Exception("Some Error Message");

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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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• Linux networking "jail" for a single process

  - by halp

  I need to tune up a networking app for network specific things like: make it use a DNS server different than the default one from /etc/resolv.conf make sure it does not try to connect to certain hosts/ports using tcp/udp connections I know I can get away with just modifying /etc/resolv.conf and writing some iptables rules, but going for a default DENY firewall policy for outgoing IP packets can trigger malfunctions in other services running on the server. I know I can set up a virtual machine with a whole OS and run my app there, but it seems a bit overkill. Is it possible to have a networking "jail" for a single app (think single Linux process) that could accept iptables-like rules for network traffic (think in terms of IP packets and above) allowed to and from this particular app? Maybe this is achievable through some dynamically loaded library that can deal with the networking layer, the same manner tsocks does, but more fine-grained?

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• How to add a skin engine to asp.net MVC system

  - by Am

  I'm implementing a solution in ASP.NET MVC that later can be applied to couple of other fields. To do so it will require to re-brand the UI even though the underlying business logic wont need to change. I'd like to write the code in such a way that will allow other developers to only develop code that will only changes the UI. This is similar to the way that themes can be written against Wordpress Blog software. Can any one suggest how to organize my project to make such feature work?

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• LVM2 vs MDADM performance

  - by archer

  I've used MDADM + LVM2 on many boxes for quite a while. MDADM was serving for both RAID0 and RAID1 arrays, while LVM2 where used for logical volumes on top of MDADM. Recently I've found that LVM2 could be used w/o MDADM (thus minus one layer, as the result - less overhead) for both mirroring and stripping. However, some guys claims that READ PERFORMANCE on LVM2 for mirrored array is not that fast as for LVM2 (linear) on top of MDADM (RAID1) as LVM2 does not read from 2+ devices at a time, but use 2nd and higher devices in case of 1st device failure. MDADM reads from 2 devices at a time (even in mirrored mode). Who could confirm that?

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• Converting Inkscape layers directly to a slideshow presentation?

  - by darenw

  I'm creating a slideshow in Inkscape. There's one or more layer per slide, plus several background layers, and some special layers to be used on several slides in a row, etc. In the past, I'd create each slide as a .png image by turning on appropriate layers and exporting an image. This is tedious and easy to make mistakes. Is it possible to automate this? To enable the right layers and save all slides directly to a file format suitable for presenatations, such as .ppt, which I can give to anyone for display? The solution will have to work on Linux.

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• Where to find Java/Groovy talent in Atlanta

  - by Craig winnerman

  I am on a retained search for a company seeking a Java Developer with Groovy experiencs. They offer a web hosted PBX phone system to small business. This is a permanent position and haveing a tough time finding good talent. Other pluses are JUnit, Scrum,SIP,VXML CCXMLand Junit. Any suggestions, please contact me directly at 727-789-2297 or [email protected]

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• Domain driven design: Manager and service

  - by ryudice

  I'm creating some business logic in the application but I'm not sure how or where to encapsulate it, I've used the repository pattern for data access, I've seen some projects that use DDD that have some classes with the "Service" suffix and the "manager" suffix, what are each of this clases suppose to take care of in DDD?

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• Adeos's role w.r.t Linux

  - by Anisha Kaul

  The event pipeline The fundamental Adeos structure one must keep in mind is the chain of client domains asking for event control. A domain is a kernelbased software component which can ask the Adeos layer to be notified of: · Every incoming external interrupt, or autogenerated virtual interrupt; · Every system call issued by Linux applications, · Other system events triggered by the kernel code (e.g. Linux task switching, signal notification, Linux task exits etc.). From: Life with Adeos: http://www.xenomai.org/documentation/xenomai-2.4/pdf/Life-with-Adeos-rev-B.pdf Question: Adeos is supposed to be between the hardware and the Linux kernel, I can understand about Adeos telling the Linux about hardware interrupts but Why should Adeos know about the "system call" issued by Linux?

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• Paypal IPN Handler for Cart

  - by kimmothy16

  Hey everyone! I'm using a Paypal add to cart button for a simple ecommerce website. I had a Paypal IPN handler written in PHP that was successfully working for 'Buy it Now' buttons and purchasing one item at a time. I would run a database query each time to update the store's inventory to reflect the purchase. Now I'm upgrading this store to a 'cart' version so people could check out with multiple items at a time. Would anyone be able to tell me, in general, how my IPN handler would need to be altered to accommodate this? I'm unsure of what a response from Paypal looks like for a cart purchase as opposed to a buy it now purchase. Thanks, any help or examples of working IPN cart scripts would be very appreciated! My current code is below.. // Paypal POSTs HTML FORM variables to this page // we must post all the variables back to paypal exactly unchanged and add an extra parameter cmd with value _notify-validate // initialise a variable with the requried cmd parameter $req = 'cmd=_notify-validate'; // go through each of the POSTed vars and add them to the variable foreach ($_POST as $key => $value) { $value = urlencode(stripslashes($value)); $req .= "&$key=$value"; } // post back to PayPal system to validate $header .= "POST /cgi-bin/webscr HTTP/1.0\r\n"; $header .= "Content-Type: application/x-www-form-urlencoded\r\n"; $header .= "Content-Length: " . strlen($req) . "\r\n\r\n"; // In a live application send it back to www.paypal.com // but during development you will want to uswe the paypal sandbox // comment out one of the following lines $fp = fsockopen ('www.sandbox.paypal.com', 80, $errno, $errstr, 30); //$fp = fsockopen ('www.paypal.com', 80, $errno, $errstr, 30); // or use port 443 for an SSL connection //$fp = fsockopen ('ssl://www.paypal.com', 443, $errno, $errstr, 30); if (!$fp) { // HTTP ERROR } else { fputs ($fp, $header . $req); while (!feof($fp)) { $res = fgets ($fp, 1024); if (strcmp ($res, "VERIFIED") == 0) { $item_name = stripslashes($_POST['item_name']); $item_number = $_POST['item_number']; $item_id = $_POST['custom']; $payment_status = $_POST['payment_status']; $payment_amount = $_POST['mc_gross']; //full amount of payment. payment_gross in US $payment_currency = $_POST['mc_currency']; $txn_id = $_POST['txn_id']; //unique transaction id $receiver_email = $_POST['receiver_email']; $payer_email = $_POST['payer_email']; $size = $_POST['option_selection1']; $item_id = $_POST['item_id']; $business = $_POST['business']; if ($payment_status == 'Completed') { // UPDATE THE DATABASE }

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• Wireless Access Point - Can't ping other machines on the wireless network

  - by Surfer513

  I have a wireless access point (Netgear), and I have it setup so that it has an IP address in the current subnet (let's say 192.168.2.0, subnet mask of 255.255.255.0). The machine that it is connected to via ethernet cable has an IP in the same subnet as the AP. The machines that are connected to the AP via the wireless connection also have an IP address in the same subnet as the rest of the network (192.168.2.0). All machines can ping the access point, but they cannot ping each other. I don't totally understand why, because there is connection and all of the machines are in the same subnet. I realize this is a layer 3 device, but is there an issue because of this AP's lack of gateway capabilities? (i.e. no routing table, etc.)

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• I'm looking for a good, active forum on data warehousing

  - by TrickyNixon

  I've been in the DW business for 15+ years and apart from the Kimball institute and a few blogs, I've yet to find a vital online community for data warehousing topics. Am I missing out on something or will I need to build it myself?

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• SSH tunnel over http proxy with blocked 443 (SSL)

  - by Evgeny Zhulenev

  Is it possible to create an SSH tunnel over http-proxy when https access is denied? I had such configuration in .ssh\config Host home User root Hostname *my-home-pc-with-ssh-access-allowed* Port 8090 ProxyCommand corkscrew db-isa-01 8080 %h %p ~/.ssh/.corkscrew-db-isa-auth IdentityFile ~/.ssh/id_rsa Where db-isa-01 is my corporate proxy server. Today the admins blocked all https access and allowed it only for few servers on the white list. I used this command to create a tunnel: ssh -D 7070 -o 'GatewayPorts yes' -A -q -g -t root@home and now it doesn't work. As I can understand, that's because our proxy denies all https connections Proxy could not open connnection to ***: Proxy Error ( The specified Secure Sockets Layer (SSL) port is not allowed. Forefront TMG is not configured to allow SSL requests from this port. Most Web browsers use port 443 for SSL requests. ) P.S. I use Windows 7, and corscskrew with cygwin, so Linux solutions not suitable for me.

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• Sonar integration in hudson, meet "container state was: CONSTRUCTED"

  - by larry cai

  Environment: hudson/sonar/maven2 in ubuntu locally with default parameters And I got the log from hudson below, I can't figure out where is the problem. [INFO] Sonar host: http://localhost:9000 [INFO] Sonar version: 2.0.1 [INFO] [sonar-core:internal {execution: default-internal}] [INFO] Database dialect class org.sonar.api.database.dialect.Derby [INFO] ------------- Analyzing Game of Life business logic module [INFO] ------------------------------------------------------------------------ [ERROR] BUILD ERROR [INFO] ------------------------------------------------------------------------ [INFO] Can not execute Sonar Embedded error: Can not analyze the project Cannot stop. Current container state was: CONSTRUCTED [INFO] ------------------------------------------------------------------------ [INFO] Trace org.apache.maven.lifecycle.LifecycleExecutionException: Can not execute Sonar

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• Payment Gateway Integration asp.net c# 2.0

  - by mvkotekar

  Myself mendy, i am designing web application, The business required to integrate payment gateway. I searched on site regarding the flow but i could not get much info on MSDN. I want to make payment gateway using SSL and 3rd party merchant account. How can i do it ? some info regarding payment gateway could guid me to start developing the component.

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• Adding multiple gradients to object in Adobe Illustrator

  - by Vass

  Hi, I have an object which is a path (a nose to be specific). Now I want both a linear gradient and a radial gradient to be added to the object. So these must be separate gradient objects I guess, and I can't find a way to add multiple separate gradients to a complete path so do I duplicate the object and then apply a new gradient to each object? And what would the layer transparency features look like? Would the 'normal' overlay of the layers work? I am afraid of multiple shadows creating double dark regions, but maybe that is as its supposed to be if you think in terms of classical art and draw shadows in terms of each light obstruction.

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• how to use winpcap to send EAPOL packets on windows 7 with wireless card?

  - by caimengru0807

  I want to implement a 802.1X wireless client on Windows 7 using PEAP/MSCHAPv2. The 802.1X protocol is a data link layer protocol, it uses the EAPOL protocol to encapsulate the packets. I use the WinPcap to send and receive the EAPOL packets, however I fail to do it with the wireless NIC. It can work fine to send the EAPOL packets use wired NIC. It can also work fine to send the EAPOL packets on Windows XP using wireless NIC. So what's wrong with it on Windows 7?

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• CSLA.net - Inheritable Base classes

  - by JMSA

  I was reading the book "Expert C# 2005 Business Objects". The book describes various base classes to be inherited by various classes to solve real-world problems. But the book does not provide examples of all those classes. Can anyone give me all of those examples (with reason) to better understand CSLA? For example, Which real-world objects are to be considered as Read-only Root Objects (Student/Product/Order, etc.)? And Why?

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• Event Viewer shows service name as a truncated 8 character name

  - by Retrocoder

  I have written a service which logs to the Windows Event Log when it has any problems. This works fine and the service name is shown correctly in the Source column of the Event Viewer. The problem I am seeing is when my service hits some major problems like the networking layer has died etc. When this happens the event log shows errors about my service but the service name is shown as a truncated 8 character name. This name looks to be that of the executable and not the service name. Is this normal behaviour for a truncated name to be show ?

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• CPU installation

  - by David Oneill

  I'm in the midst of building a computer (this is my first time). When I first put the heatsink on the CPU, I was a little off center. Some of the thermal compound came off, so when I re-centered it, it isn't completely evenly distributed. So here's my question: how picky are CPUs in terms of how evenly the thermal compound is? Should I take it apart, clean it, and apply a new layer of compound? Or can I just keep an eye on the CPU temperature? (I'm not overclocking or anything, if that matters)

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• Dual Home HP Server running Win2003

  - by Colm

  Hello everyone. I'm new to server dual homing. I have a HP ProLiant DL360 G4p running Win2003 with 2 NICs , only one is currently active. I'd like to activate the 2nd NIC connected (in a active/passive state) to a 2nd switch with only one IP address and ideally only one mac layer address. The 1st switch is a Cisco 2960G and the 2nd is a Cisco C3560G. There are VLANS, RSTP and PAGP in use already. Can someone give me an idea, in broad terms , of what technology/protocols I should be investigating (HSRP, SLB Teaming etc.) ? I can provide more info if needed. Thanks, Colm.

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• JEE6 Advice - how viable is it?

  - by user294740

  Hello! A friend and I are trying to start our own UK based business. We both know Java and thought we'd try to implement it using JEE6 and JSP. Can anyone offer some advice on how viable it would be and provide us with resources to consult?

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• IBM Tivoli Network Manager IP Edition - Job does not run

  - by Thorsten Niehues

  Since our network discovery takes too long I tried to split the biggest job into two parts. The two parts use the same Perl script but have a different scope. I copied a Job (Agent) doing the following: Copied the .agnt file Copied the associated perl script The problem is that one or the other job (changes randomly) does not run. The Disco Process will fail eventually. In the log of the job which does not run I see the following error message: Wed Jul 18 08:48:54 2012 Warning: Failed to send on transport layer found in file CRivObjSockClient.cc at line 1293 - Client My_MacTable_Cis is not connected to service Helper How do I fix this problem?

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• Daylight saving time and Timezone best practices

  - by Oded

  I am hoping to make this question and the answers to it the definitive guide to dealing with daylight saving time, in particular for dealing with the actual change overs. If you have anything to add, please do Many systems are dependent on keeping accurate time, the problem is with changes to time due to daylight savings - moving the clock forward or backwards. For instance, one has business rules in an order taking system that depend on the time of the order - if the clock changes, the rules might not be as clear. How should the time of the order be persisted? There is of course an endless number of scenarios - this one is simply an illustrative one. How have you dealt with the daylight saving issue? What assumptions are part of your solution? (looking for context here) As important, if not more so: What did you try that did not work? Why did it not work? I would be interested in programming, OS, data persistence and other pertinent aspects of the issue. General answers are great, but I would also like to see details especially if they are only available on one platform. Summary of answers and other data: (please add yours) Do: Always persist time according to a unified standard that is not affected by daylight savings. GMT and UTC have been mentioned by different people. Include the local time offset (including DST offset) in stored timestamps. Remember that DST offsets are not always an integer number of hours (e.g. Indian Standard Time is UTC+05:30). If using Java, use JodaTime. - http://joda-time.sourceforge.net/ Create a table TZOffsets with three columns: RegionClassId, StartDateTime, and OffsetMinutes (int, in minutes). See answer Check if your DBMS needs to be shutdown during transition. Business rules should always work on civil time. Internally, keep timestamps in something like civil-time-seconds-from-epoch. See answer Only convert to local times at the last possible moment. Don't: Do not use javascript date and time calculations in web apps unless you ABSOLUTELY have to. Testing: When testing make sure you test countries in the Western and Eastern hemispheres, with both DST in progress and not and a country that does not use DST (6 in total). Reference: Olson database, aka Tz_database - ftp://elsie.nci.nih.gov/pub Sources for Time Zone and DST - http://www.twinsun.com/tz/tz-link.htm ISO format (ISO 8601) - http://en.wikipedia.org/wiki/ISO_8601 Mapping between Olson database and Windows TimeZone Ids, from the Unicode Consortium - http://unicode.org/repos/cldr-tmp/trunk/diff/supplemental/windows_tzid.html TimeZone page on WikiPedia - http://en.wikipedia.org/wiki/Tz_database StackOverflow questions tagged dst - http://stackoverflow.com/questions/tagged/dst StackOverflow questions tagged timezone - http://stackoverflow.com/questions/tagged/timezone Other: Lobby your representative to end the abomination that is DST. We can always hope...

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