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  • What ethical problems realistically arise in programming?

    - by Fishtoaster
    When I co-oped during college, I had to fill out an evaluation of the co-op afterwards. One metric I always had to rate was how much the company required me to "Make ethical decisions related to your profession." This always seemed kinda silly- I mean, my first co-op was writing java apps to manage industrial radios. There wasn't much moral ambiguity going on. Anyway, I'm wonder what sort of ethical dilemmas one might actually encounter in software development. Edit: It should be noted that no ethically-trained software engineer would ever consent to write a DestroyBaghdad procedure. Basic professional ethics would require him to write a DestroyCity procedure, to which Baghdad could be given as a parameter. - Nathanial Borenstein

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  • ldirectord ipvsadm not show reals ip and not work wtih pacemaker and corosync

    - by miguer27
    first thanks for your time. I'm having a problem with ldirectord that I can not solve, I comment my situation: I have two nodes with pace maker and corosync and configure somes resources: root@ldap1:/home/mamartin# crm status Last updated: Tue Jun 3 12:58:30 2014 Last change: Tue Jun 3 12:23:47 2014 via cibadmin on ldap1 Stack: openais Current DC: ldap2 - partition with quorum Version: 1.1.7-ee0730e13d124c3d58f00016c3376a1de5323cff 2 Nodes configured, 2 expected votes 7 Resources configured. Online: [ ldap1 ldap2 ] Resource Group: IPV_LVS IPV_4 (ocf::heartbeat:IPaddr2): Started ldap1 IPV_6 (ocf::heartbeat:IPv6addr): Started ldap1 lvs (ocf::heartbeat:ldirectord): Started ldap1 Clone Set: clon_IPV_lo [IPV_lo] Started: [ ldap2 ] Stopped: [ IPV_lo:1 ] root@ldap1:/home/mamartin# crm configure show node ldap2 \ attributes standby="off" node ldap1 \ attributes standby="off" primitive IPV-lo_4 ocf:heartbeat:IPaddr \ params ip="192.168.1.10" cidr_netmask="32" nic="lo" \ op monitor interval="5s" primitive IPV-lo_6 ocf:heartbeat:IPv6addrLO \ params ipv6addr="[fc00:1::3]" cidr_netmask="64" \ op monitor interval="5s" primitive IPV_4 ocf:heartbeat:IPaddr2 \ params ip="192.168.1.10" nic="eth0" cidr_netmask="25" lvs_support="true" \ op monitor interval="5s" primitive IPV_6 ocf:heartbeat:IPv6addr \ params ipv6addr="[fc00:1::3]" nic="eth0" cidr_netmask="64" \ op monitor interval="5s" primitive lvs ocf:heartbeat:ldirectord \ params configfile="/etc/ldirectord.cf" \ op monitor interval="20" timeout="10" \ meta target-role="Started" group IPV_LVS IPV_4 IPV_6 lvs group IPV_lo IPV-lo_6 IPV-lo_4 clone clon_IPV_lo IPV_lo \ meta interleave="true" target-role="Started" location cli-prefer-IPV_LVS IPV_LVS \ rule $id="cli-prefer-rule-IPV_LVS" inf: #uname eq ldap1 colocation LVS_no_IPV_lo -inf: clon_IPV_lo IPV_LVS property $id="cib-bootstrap-options" \ dc-version="1.1.7-ee0730e13d124c3d58f00016c3376a1de5323cff" \ cluster-infrastructure="openais" \ expected-quorum-votes="2" \ no-quorum-policy="ignore" \ stonith-enabled="false" \ last-lrm-refresh="1401264327" rsc_defaults $id="rsc-options" \ resource-stickiness="1000" The problem is in the ipvsadm only show a one real IP, when i configured two now, show the ldirector.cf: root@ldap1:/home/mamartin# ipvsadm IP Virtual Server version 1.2.1 (size=4096) Prot LocalAddress:Port Scheduler Flags - RemoteAddress:Port Forward Weight ActiveConn InActConn TCP ldap-maqueta.cica.es:ldap wrr - ldap2.cica.es:ldap Route 4 0 0 TCP [[fc00:1::3]]:ldap wrr - [[fc00:1::2]]:ldap Route 4 0 0 root@ldap1:/home/mamartin# cat /etc/ldirectord.cf checktimeout=10 checkinterval=2 autoreload=yes logfile="/var/log/ldirectord.log" quiescent=yes #ipv4 virtual=192.168.1.10:389 real=192.168.1.11:389 gate 4 real=192.168.1.12:389 gate 4 scheduler=wrr protocol=tcp checktype=on #ipv6 virtual6=[[fc00:1::3]]:389 real6=[[fc00:1::1]]:389 gate 4 real6=[[fc00:1::2]]:389 gate 4 scheduler=wrr protocol=tcp checkport=389 checktype=on and in the logs I see nothing clear: root@ldap1:/home/mamartin# ldirectord -d /etc/ldirectord.cf start DEBUG2: Running system(/sbin/ipvsadm -a -t 192.168.1.10:389 -r 192.168.1.11:389 -g -w 0) Running system(/sbin/ipvsadm -a -t 192.168.1.10:389 -r 192.168.1.11:389 -g -w 0) DEBUG2: Quiescent real server: 192.168.1.11:389 (192.168.1.10:389) (Weight set to 0) Quiescent real server: 192.168.1.11:389 (192.168.1.10:389) (Weight set to 0) DEBUG2: Disabled real server=on:tcp:192.168.1.11:389:::4:gate:\/: (virtual=tcp:192.168.1.10:389) DEBUG2: Running system(/sbin/ipvsadm -a -t 192.168.1.10:389 -r 192.168.1.12:389 -g -w 0) Running system(/sbin/ipvsadm -a -t 192.168.1.10:389 -r 192.168.1.12:389 -g -w 0) DEBUG2: Quiescent real server: 192.168.1.12:389 (192.168.1.10:389) (Weight set to 0) Quiescent real server: 192.168.1.12:389 (192.168.1.10:389) (Weight set to 0) DEBUG2: Disabled real server=on:tcp:192.168.1.12:389:::4:gate:\/: (virtual=tcp:192.168.1.10:389) DEBUG2: Checking on: Real servers are added without any checks DEBUG2: Resetting soft failure count: 192.168.1.12:389 (tcp:192.168.1.10:389) Resetting soft failure count: 192.168.1.12:389 (tcp:192.168.1.10:389) DEBUG2: Running system(/sbin/ipvsadm -a -t 192.168.1.10:389 -r 192.168.1.12:389 -g -w 4) Running system(/sbin/ipvsadm -a -t 192.168.1.10:389 -r 192.168.1.12:389 -g -w 4) Destination already exists root@ldap1:/home/mamartin# cat /var/log/ldirectord.log [Tue Jun 3 09:39:29 2014|ldirectord.cf|19266] Quiescent real server: 192.168.1.11:389 (192.168.1.10:389) (Weight set to 0) [Tue Jun 3 09:39:29 2014|ldirectord.cf|19266] Quiescent real server: 192.168.1.12:389 (192.168.1.10:389) (Weight set to 0) [Tue Jun 3 09:39:29 2014|ldirectord.cf|19266] Resetting soft failure count: 192.168.1.12:389 (tcp:192.168.1.10:389) [Tue Jun 3 09:39:29 2014|ldirectord.cf|19266] system(/sbin/ipvsadm -a -t 192.168.1.10:389 -r 192.168.1.12:389 -g -w 4) failed: [Tue Jun 3 09:39:29 2014|ldirectord.cf|19266] Added real server: 192.168.1.12:389 (192.168.1.10:389) (Weight set to 4) [Tue Jun 3 09:39:29 2014|ldirectord.cf|19266] Resetting soft failure count: 192.168.1.11:389 (tcp:192.168.1.10:389) [Tue Jun 3 09:39:29 2014|ldirectord.cf|19266] Restored real server: 192.168.1.11:389 (192.168.1.10:389) (Weight set to 4) [Tue Jun 3 09:39:29 2014|ldirectord.cf|19266] Resetting soft failure count: [[fc00:1::2]]:389 (tcp:[[fc00:1::3]]:389) [Tue Jun 3 09:39:29 2014|ldirectord.cf|19266] system(/sbin/ipvsadm -a -t [[fc00:1::3]]:389 -r [[fc00:1::2]]:389 -g -w 4) failed: [Tue Jun 3 09:39:29 2014|ldirectord.cf|19266] Added real server: [[fc00:1::2]]:389 ([[fc00:1::3]]:389) (Weight set to 4) [Tue Jun 3 09:39:29 2014|ldirectord.cf|19266] Resetting soft failure count: [[fc00:1::1]]:389 (tcp:[[fc00:1::3]]:389) [Tue Jun 3 09:39:29 2014|ldirectord.cf|19266] Restored real server: [[fc00:1::1]]:389 ([[fc00:1::3]]:389) (Weight set to 4) do not know if this is a bug or a configuration error, can anyone help? Regards.

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  • Herzlichen Glückwunsch!

    - by cjandaus
      Ich darf ja keine Namen nennen, aber der Gewinner unserer Umfrage auf der DOAG Konferenz 2012 steht fest und hat sich mit seiner Teilnahme selbst ein erstklassiges Nikolaus-Geschenk gemacht - und zwar ein niegelnagelneues iPad!!! Zugegeben - genau so wie auf dem Bild sieht das iPad des glücklichen Gewinners nicht aus, denn dieser Custom Design Wunsch von mir hätte wahrscheinlich ebenso viel gekostet wie eine ausgewachsene Exadata, aber das wird die Freude nicht trüben. Und freuen können sich auch noch die Gewinner auf den Plätzen 2 bis 5 - nämlich über eine Laptop-Tasche, hochwertigen Stift und Notizmappe aus Leder. Ich freue mich mit den Gewinnern und nicht zuletzt über die rege Teilnahme und vor allem die Ergebnisse der Umfrage. Auch dazu kann ich nicht viel sagen, nur so viel, dass Windows als Server Betriebssystem für Oracle Datenbanken kein Schattendasein führt. In diesem Sinne bin ich gespannt auf die kommende DOAG Datenbank Konferenz im Mai 2013, auf der ich hoffentlich die Gelegenheit bekommen werde, um die Oracle 12c Datenbank auf Windows Server 2012 und Windows 8 vorzustellen. Keynote Sprecher ist übrigens Günther Stürner - das Highlight der Konferenz.

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  • Jetzt anmelden: Oracle Database Security Seminare

    - by A&C Redaktion
    Die Anforderungen an Datensicherheit steigen stetig. Seit mehr als 30 Jahren verfügt Oracle über Kompetenz im Bereich der Informationssicherheit. Wenn es um handfeste Lösungen für die Datensicherheit geht, sind Sie bei uns also in den besten Händen.  Nutzen Sie die kostenlosen Database Security Seminare, um sich mit Experten von Oracle und Platinum Partner Trivadis über den Schutz Ihrer IT-Infrastruktur auszutauschen und mehr darüber zu erfahren, wie Sie Schwachstellen erkennen und welche Maßnahmen Ihnen bei der Verbesserung des Sicherheitsstatus Ihres Unternehmens helfen können. Die Plätze sind begrenzt - melden Sie sich gleich online an: 13. Juni 2012, Oracle Geschäftsstelle Hamburg 20. Juni 2012, Oracle Geschäftsstelle Stuttgart

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  • Architecture - 32-bit handling 64-bit instructions

    - by tkoomzaaskz
    tomasz@tomasz-lenovo-ideapad-Y530:~$ lscpu Architecture: i686 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian CPU(s): 2 On-line CPU(s) list: 0,1 Thread(s) per core: 1 Core(s) per socket: 2 Socket(s): 1 Vendor ID: GenuineIntel CPU family: 6 Model: 23 Stepping: 6 CPU MHz: 2000.000 BogoMIPS: 4000.12 Cache L1d: 32K Cache L1i: 32K Cache L2: 3072K I can see that my architecture is 32-bit (i686). But CPU op-mode(s) are 32-bit and 64-bit. The question is: how come? How is it handled that a 32-bit processor performs 64-bit operations? I guess it's a lot slower than native 32-bit operations. Is it built-in processor functionality (to emulate being 64-bit) or is it software dependent? When does it make sense for a 32-bit processor to run 64-bit operations?

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  • Qualifying 'happiness' in software development?

    - by mummey
    It occurred to me today that often the real goal of questions asked on sites such as this one (where the questions tend to be more open-ended than say, SO) is for the OP to become happier upon achieving the result. We often excuse this by saying our desire is to be more productive or release a better product, but if you continue to look down this path you can determine that the OP seeks greater productivity or product-quality because those are important to his/her 'happiness'. With that in-mind I ask this: Have their been efforts to study software development from this perspective? In other words, what practises increase happiness in those who develop software as a career, and who, if anyone, has researched this specifically? As I mentioned above, they may include strategies that increase productivity or improve product quality, but by no means should they be limited to just those.

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  • APEX-Region "Karte" mit eigenen Karten ausstatten

    - by carstenczarski
    Seit der Version 4.0 bietet APEX den Diagrammtyp "Karte" an; dieser erlaubt die sehr einfache Integration von Karten in eine APEX-Anwendung. Die Darstellung der Karten basiert, wie für alle Diagrammtypen, auf AnyChart. APEX bietet zwar eine Vielfalt von verfügbaren Karten an, in der Praxis dürften diese jedoch selten ausreichen - zu verschieden sind die Anforderungen; für Deutschland werden nur zwei Karten angeboten. Oft ist es also nötig, den APEX-Lieferumfang um eigene Karten zu erweitern. Wie das geht, beschreibt unser aktueller Community-Tipp.

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  • Pommes für alle?

    - by A&C Redaktion
    Ja, liebe Partner - wie Sie sich und Ihre Kunden vor ungewollten Zugriffen schützen, dazu gibt es nun einen charmanten Video-Clip, der in nur einer Minute den Sprung von den Pommes zur Oracle Access Management Suite schafft. Eine spielerische Hinführung zum Thema Zugriffsrechte, die sich mit ihrem gelungenen Überraschungseffekt auch hervorragend im Kundengespräch nutzen lässt. Gleich anschauen, „gefällt mir“ klicken - weiterempfehlen und verlinken! Weiterführende Informationen zum Access Management Portfolio sind online verfügbar:http://www.oracle.com/us/products/middleware/identity-management/access-management/overview/index.htmlAuch auf die derzeit am Markt besprochenen Themen zu Mobile&Social hat Oracle eine neue Antwort:http://www.oracle.com/technetwork/middleware/id-mgmt/overview/oamms-1696162.htmlEin weiteres sehenswertes Video finden Sie hier:http://www.oracle.com/us/products/middleware/identity-management/oiam/overview/index.html

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  • Pommes für alle?

    - by A&C Redaktion
    Ja, liebe Partner - wie Sie sich und Ihre Kunden vor ungewollten Zugriffen schützen, dazu gibt es nun einen charmanten Video-Clip, der in nur einer Minute den Sprung von den Pommes zur Oracle Access Management Suite schafft. Eine spielerische Hinführung zum Thema Zugriffsrechte, die sich mit ihrem gelungenen Überraschungseffekt auch hervorragend im Kundengespräch nutzen lässt. Gleich anschauen, „gefällt mir“ klicken - weiterempfehlen und verlinken! Weiterführende Informationen zum Access Management Portfolio sind online verfügbar:http://www.oracle.com/us/products/middleware/identity-management/access-management/overview/index.htmlAuch auf die derzeit am Markt besprochenen Themen zu Mobile&Social hat Oracle eine neue Antwort:http://www.oracle.com/technetwork/middleware/id-mgmt/overview/oamms-1696162.htmlEin weiteres sehenswertes Video finden Sie hier:http://www.oracle.com/us/products/middleware/identity-management/oiam/overview/index.html

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  • Mal kurz nachgefragt: Oracle Datenbank Security-Optionen

    - by Anne Manke
    Am 13.11.2012 fand der erste Oracle Healthcare Security Workshop in Düsseldorf statt. Um Sie mit nützlichen Informationen zu den Oracle Security-Optionen vor und nach unserem Workshop zu versorgen, werden wir ab heute, jede Woche eine Security-Option vorstellen. Um schnell einen Überblick zu bekommen, gibt es die Kategorien "WER" - hier wollen wir die Zielgruppe für die Funktion vorstellen, also, wer diese spezifische Option nutzen kann und sollte. Unter der Kategorie "WAS" werden wir die Funktionsweise erläutern, und unter "WIE" finden Sie Beispiele für den Einsatz der Security-Option. Die Kategorie "Und sonst so?" behandelt allgemeine oder oft gestellte Fragen zu unseren Optionen.  Viel Spaß beim Lesen und sollte es Fragen geben, können Sie uns jederzeit anrufen! Ihr Oracle Healthcare Team

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  • Datenbank Speicherplatz überwachen mit dem Segment Advisor

    - by Ulrike Schwinn (DBA Community)
    Wie kritisch ist die Belegung des Speicherplatzes innerhalb der Tablespaces? Können vielleicht einige Segmente verkleinert bzw. reorganisiert werden, die unnötigen Platz verbrauchen? Um Antworten auf diese Fragen zu erhalten, gibt es die Möglichkeit unterschiedliche Data Dictionary Views wie DBA_SEGMENTS, DBA_EXTENTS und DBA_FREE_SPACE abzufragen bzw. Packages wie DBMS_SPACE zur detaillierten Analyse zu verwenden. Zusätzlich gibt es in der Oracle Datenbank spezielle mitgelieferte Advisors, die bei der Analyse des Speicherplatzes und der Objekte eine gewisse Unterstützung liefern können - den sogenannten Segment und den Compression Advisor. Der aktuelle Artikel in der DBA Community illustriert díe Verwendungsweise des Segment Advisors.

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  • Are there any actual examples of profitable programmer's "worker's cooperatives"?

    - by Wannabe Tycoon
    http://en.wikipedia.org/wiki/Worker_cooperative I'm curious whether there are, anywhere in the world, worker's cooperatives that center on a technology business that involves either programming, IT, or some sort of IT or programming related consulting or services. The wikipedia link above is an overview of the concept. The short form explanation is that a co-op is a worker-owned business. Also there is the notion that every worker owns shares in the business. I am interested in knowing whether an example of a "programmer's/IT co-op" even exists. Note: I am not talking about nor asking about a government-funded incubator nor any other socialized, state supported group. I also don't mean "co-working", which is renting an office with other self employed people doing their own thing. I mean a going, profitable IT business operating in a competitive environment that is worker-owned and run.

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  • Facing Problems While Installing Java

    - by user100381
    First When i downloaded java from official website i got confused how to install it. den i searched it on software center and i got it. but wen i install it, it starts but instantly stops and the line highlighting the installation status in progress tab doesn't move forward.den i searched on internet and tried installing it by terminal but he terminal says that u have to first configure something that i dont know but it tells me to run this command-"sudo dpkg-configure -a" and when i run this command the terminal process stops in the middle and even after leaving it for about an hour it doesn't proceed further.. after that when i press the close button of the terminal if shows that some tasks are in progress and closing the terminal would...bla bla bla... so i am greatly confused because even other software's like gimp image editor and all are not getting installed.. please help me..!!

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  • Adding Facebook Log in button to PHP code

    - by CMaury
    I am trying to add the new Facebook log in button to my registration page on my Drupal site. I know the following code is wrong, but I don't know the right syntax to implement it: function facebook_user($op, &$edit, &$user, $category = NULL) { switch($op) { // User is registering. case 'register': // Add a Facebook login button. echo ' '; } } What should I use instead of echo? Is there another way I should be going about this? Thanks

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  • Drupal - assign menu to block based on node type

    - by ernie
    I want to assign a specific menu in left sidebar block, based on the node type of the page currently being displayed. I think it should look something like this, but I am stuck. function my_module_nodeapi(&$node, $op) { switch ($op) { case 'view': if ($node->type == "large_reptiles") { //menu_set_active_menu_name('menu_reptile_menu'); //menu_set_active_item('menu_reptile_menu'); } break; } }

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  • Two Phase Commit with MongoDB

    - by mattcodes
    Heres what Im thinking. Do you see any issues with this workaround to emulate 2 phase commit when using something like MongoDB where each operation is atomic and there is no support for transactions outside of that? transaction_scope: read message from servicebus - UpdateCustomerAddress get customer aggregate from docdb, replay events where commited =1 call customer.updateAddress validates creates customer address updated event apply event event store as uncommitted events do optimistic concurrency update against docdb pushing uncommitted events (single op to ensure consistency) publish event to service bus update docdb set events just published to commited = 1 (again one 1 op - at least in mongodb) transaction_complete

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  • printing dynamically string in one line in python

    - by EngHamoud
    I'm trying to print strings in one line. I've found solutions but they don't works with windows correctly. I have text file contains names and I want to print them like this name=john then change john to next name and keep name=, I've made this code but didn't work correctly with windows: op = open('names.txt','r') print 'name=', for i in op.readlines(): print '\r'+i.strip('\n') thank you for your time

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  • How do I modify a record in erlang?

    - by Yadira Suazo
    Hi, I need replace the same value for variables {place} and {other_place} in the record op. #op{ action = [walk, from, {place}, to, {other_place}], preconds = [[at, {place}, me], [on, floor, me], [other_place, {place}, {other_place}]], add_list = [[at, {other_place}, me]], del_list = [[at, {place}, me]] } But erlang don´t share variables. Is there any data type for that?

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  • Building applications with WCF - Intro

    - by skjagini
    I am going to write series of articles using Windows Communication Framework (WCF) to develop client and server applications and this is the first part of that series. What is WCF As Juwal puts in his Programming WCF book, WCF provides an SDK for developing and deploying services on Windows, provides runtime environment to expose CLR types as services and consume services as CLR types. Building services with WCF is incredibly easy and it’s implementation provides a set of industry standards and off the shelf plumbing including service hosting, instance management, reliability, transaction management, security etc such that it greatly increases productivity Scenario: Lets consider a typical bank customer trying to create an account, deposit amount and transfer funds between accounts, i.e. checking and savings. To make it interesting, we are going to divide the functionality into multiple services and each of them working with database directly. We will run test cases with and without transactional support across services. In this post we will build contracts, services, data access layer, unit tests to verify end to end communication etc, nothing big stuff here and we dig into other features of the WCF in subsequent posts with incremental changes. In any distributed architecture we have two pieces i.e. services and clients. Services as the name implies provide functionality to execute various pieces of business logic on the server, and clients providing interaction to the end user. Services can be built with Web Services or with WCF. Service built on WCF have the advantage of binding independent, i.e. can run against TCP and HTTP protocol without any significant changes to the code. Solution Services Profile: For creating a new bank customer, getting details about existing customer ProfileContract ProfileService Checking Account: To get checking account balance, deposit or withdraw amount CheckingAccountContract CheckingAccountService Savings Account: To get savings account balance, deposit or withdraw amount SavingsAccountContract SavingsAccountService ServiceHost: To host services, i.e. running the services at particular address, binding and contract where client can connect to Client: Helps end user to use services like creating account and amount transfer between the accounts BankDAL: Data access layer to work with database     BankDAL It’s no brainer not to use an ORM as many matured products are available currently in market including Linq2Sql, Entity Framework (EF), LLblGenPro etc. For this exercise I am going to use Entity Framework 4.0, CTP 5 with code first approach. There are two approaches when working with data, data driven and code driven. In data driven we start by designing tables and their constrains in database and generate entities in code while in code driven (code first) approach entities are defined in code and the metadata generated from the entities is used by the EF to create tables and table constrains. In previous versions the entity classes had  to derive from EF specific base classes. In EF 4 it  is not required to derive from any EF classes, the entities are not only persistence ignorant but also enable full test driven development using mock frameworks.  Application consists of 3 entities, Customer entity which contains Customer details; CheckingAccount and SavingsAccount to hold the respective account balance. We could have introduced an Account base class for CheckingAccount and SavingsAccount which is certainly possible with EF mappings but to keep it simple we are just going to follow 1 –1 mapping between entity and table mappings. Lets start out by defining a class called Customer which will be mapped to Customer table, observe that the class is simply a plain old clr object (POCO) and has no reference to EF at all. using System;   namespace BankDAL.Model { public class Customer { public int Id { get; set; } public string FullName { get; set; } public string Address { get; set; } public DateTime DateOfBirth { get; set; } } }   In order to inform EF about the Customer entity we have to define a database context with properties of type DbSet<> for every POCO which needs to be mapped to a table in database. EF uses convention over configuration to generate the metadata resulting in much less configuration. using System.Data.Entity;   namespace BankDAL.Model { public class BankDbContext: DbContext { public DbSet<Customer> Customers { get; set; } } }   Entity constrains can be defined through attributes on Customer class or using fluent syntax (no need to muscle with xml files), CustomerConfiguration class. By defining constrains in a separate class we can maintain clean POCOs without corrupting entity classes with database specific information.   using System; using System.Data.Entity.ModelConfiguration;   namespace BankDAL.Model { public class CustomerConfiguration: EntityTypeConfiguration<Customer> { public CustomerConfiguration() { Initialize(); }   private void Initialize() { //Setting the Primary Key this.HasKey(e => e.Id);   //Setting required fields this.HasRequired(e => e.FullName); this.HasRequired(e => e.Address); //Todo: Can't create required constraint as DateOfBirth is not reference type, research it //this.HasRequired(e => e.DateOfBirth); } } }   Any queries executed against Customers property in BankDbContext are executed against Cusomers table. By convention EF looks for connection string with key of BankDbContext when working with the context.   We are going to define a helper class to work with Customer entity with methods for querying, adding new entity etc and these are known as repository classes, i.e., CustomerRepository   using System; using System.Data.Entity; using System.Linq; using BankDAL.Model;   namespace BankDAL.Repositories { public class CustomerRepository { private readonly IDbSet<Customer> _customers;   public CustomerRepository(BankDbContext bankDbContext) { if (bankDbContext == null) throw new ArgumentNullException(); _customers = bankDbContext.Customers; }   public IQueryable<Customer> Query() { return _customers; }   public void Add(Customer customer) { _customers.Add(customer); } } }   From the above code it is observable that the Query methods returns customers as IQueryable i.e. customers are retrieved only when actually used i.e. iterated. Returning as IQueryable also allows to execute filtering and joining statements from business logic using lamba expressions without cluttering the data access layer with tens of methods.   Our CheckingAccountRepository and SavingsAccountRepository look very similar to each other using System; using System.Data.Entity; using System.Linq; using BankDAL.Model;   namespace BankDAL.Repositories { public class CheckingAccountRepository { private readonly IDbSet<CheckingAccount> _checkingAccounts;   public CheckingAccountRepository(BankDbContext bankDbContext) { if (bankDbContext == null) throw new ArgumentNullException(); _checkingAccounts = bankDbContext.CheckingAccounts; }   public IQueryable<CheckingAccount> Query() { return _checkingAccounts; }   public void Add(CheckingAccount account) { _checkingAccounts.Add(account); }   public IQueryable<CheckingAccount> GetAccount(int customerId) { return (from act in _checkingAccounts where act.CustomerId == customerId select act); }   } } The repository classes look very similar to each other for Query and Add methods, with the help of C# generics and implementing repository pattern (Martin Fowler) we can reduce the repeated code. Jarod from ElegantCode has posted an article on how to use repository pattern with EF which we will implement in the subsequent articles along with WCF Unity life time managers by Drew Contracts It is very easy to follow contract first approach with WCF, define the interface and append ServiceContract, OperationContract attributes. IProfile contract exposes functionality for creating customer and getting customer details.   using System; using System.ServiceModel; using BankDAL.Model;   namespace ProfileContract { [ServiceContract] public interface IProfile { [OperationContract] Customer CreateCustomer(string customerName, string address, DateTime dateOfBirth);   [OperationContract] Customer GetCustomer(int id);   } }   ICheckingAccount contract exposes functionality for working with checking account, i.e., getting balance, deposit and withdraw of amount. ISavingsAccount contract looks the same as checking account.   using System.ServiceModel;   namespace CheckingAccountContract { [ServiceContract] public interface ICheckingAccount { [OperationContract] decimal? GetCheckingAccountBalance(int customerId);   [OperationContract] void DepositAmount(int customerId,decimal amount);   [OperationContract] void WithdrawAmount(int customerId, decimal amount);   } }   Services   Having covered the data access layer and contracts so far and here comes the core of the business logic, i.e. services.   .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; } .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; } .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; } .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; } .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; } ProfileService implements the IProfile contract for creating customer and getting customer detail using CustomerRepository. using System; using System.Linq; using System.ServiceModel; using BankDAL; using BankDAL.Model; using BankDAL.Repositories; using ProfileContract;   namespace ProfileService { [ServiceBehavior(IncludeExceptionDetailInFaults = true)] public class Profile: IProfile { public Customer CreateAccount( string customerName, string address, DateTime dateOfBirth) { Customer cust = new Customer { FullName = customerName, Address = address, DateOfBirth = dateOfBirth };   using (var bankDbContext = new BankDbContext()) { new CustomerRepository(bankDbContext).Add(cust); bankDbContext.SaveChanges(); } return cust; }   public Customer CreateCustomer(string customerName, string address, DateTime dateOfBirth) { return CreateAccount(customerName, address, dateOfBirth); } public Customer GetCustomer(int id) { return new CustomerRepository(new BankDbContext()).Query() .Where(i => i.Id == id).FirstOrDefault(); }   } } From the above code you shall observe that we are calling bankDBContext’s SaveChanges method and there is no save method specific to customer entity because EF manages all the changes centralized at the context level and all the pending changes so far are submitted in a batch and it is represented as Unit of Work. Similarly Checking service implements ICheckingAccount contract using CheckingAccountRepository, notice that we are throwing overdraft exception if the balance falls by zero. WCF has it’s own way of raising exceptions using fault contracts which will be explained in the subsequent articles. SavingsAccountService is similar to CheckingAccountService. using System; using System.Linq; using System.ServiceModel; using BankDAL.Model; using BankDAL.Repositories; using CheckingAccountContract;   namespace CheckingAccountService { [ServiceBehavior(IncludeExceptionDetailInFaults = true)] public class Checking:ICheckingAccount { public decimal? GetCheckingAccountBalance(int customerId) { using (var bankDbContext = new BankDbContext()) { CheckingAccount account = (new CheckingAccountRepository(bankDbContext) .GetAccount(customerId)).FirstOrDefault();   if (account != null) return account.Balance;   return null; } }   public void DepositAmount(int customerId, decimal amount) { using(var bankDbContext = new BankDbContext()) { var checkingAccountRepository = new CheckingAccountRepository(bankDbContext); CheckingAccount account = (checkingAccountRepository.GetAccount(customerId)) .FirstOrDefault();   if (account == null) { account = new CheckingAccount() { CustomerId = customerId }; checkingAccountRepository.Add(account); }   account.Balance = account.Balance + amount; if (account.Balance < 0) throw new ApplicationException("Overdraft not accepted");   bankDbContext.SaveChanges(); } } public void WithdrawAmount(int customerId, decimal amount) { DepositAmount(customerId, -1*amount); } } }   BankServiceHost The host acts as a glue binding contracts with it’s services, exposing the endpoints. The services can be exposed either through the code or configuration file, configuration file is preferred as it allows run time changes to service behavior even after deployment. We have 3 services and for each of the service you need to define name (the class that implements the service with fully qualified namespace) and endpoint known as ABC, i.e. address, binding and contract. We are using netTcpBinding and have defined the base address with for each of the contracts .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; } <system.serviceModel> <services> <service name="ProfileService.Profile"> <endpoint binding="netTcpBinding" contract="ProfileContract.IProfile"/> <host> <baseAddresses> <add baseAddress="net.tcp://localhost:1000/Profile"/> </baseAddresses> </host> </service> <service name="CheckingAccountService.Checking"> <endpoint binding="netTcpBinding" contract="CheckingAccountContract.ICheckingAccount"/> <host> <baseAddresses> <add baseAddress="net.tcp://localhost:1000/Checking"/> </baseAddresses> </host> </service> <service name="SavingsAccountService.Savings"> <endpoint binding="netTcpBinding" contract="SavingsAccountContract.ISavingsAccount"/> <host> <baseAddresses> <add baseAddress="net.tcp://localhost:1000/Savings"/> </baseAddresses> </host> </service> </services> </system.serviceModel> Have to open the services by creating service host which will handle the incoming requests from clients.   using System;   namespace ServiceHost { class Program { static void Main(string[] args) { CreateHosts(); Console.ReadLine(); }   private static void CreateHosts() { CreateHost(typeof(ProfileService.Profile),"Profile Service"); CreateHost(typeof(SavingsAccountService.Savings), "Savings Account Service"); CreateHost(typeof(CheckingAccountService.Checking), "Checking Account Service"); }   private static void CreateHost(Type type, string hostDescription) { System.ServiceModel.ServiceHost host = new System.ServiceModel.ServiceHost(type); host.Open();   if (host.ChannelDispatchers != null && host.ChannelDispatchers.Count != 0 && host.ChannelDispatchers[0].Listener != null) Console.WriteLine("Started: " + host.ChannelDispatchers[0].Listener.Uri); else Console.WriteLine("Failed to start:" + hostDescription); } } } BankClient    The client has no knowledge about service business logic other than the functionality it exposes through the contract, end points and a proxy to work against. The endpoint data and server proxy can be generated by right clicking on the project reference and choosing ‘Add Service Reference’ and entering the service end point address. Or if you have access to source, you can manually reference contract dlls and update clients configuration file to point to the service end point if the server and client happens to be being built using .Net framework. One of the pros with the manual approach is you don’t have to work against messy code generated files.   <system.serviceModel> <client> <endpoint name="tcpProfile" address="net.tcp://localhost:1000/Profile" binding="netTcpBinding" contract="ProfileContract.IProfile"/> <endpoint name="tcpCheckingAccount" address="net.tcp://localhost:1000/Checking" binding="netTcpBinding" contract="CheckingAccountContract.ICheckingAccount"/> <endpoint name="tcpSavingsAccount" address="net.tcp://localhost:1000/Savings" binding="netTcpBinding" contract="SavingsAccountContract.ISavingsAccount"/>   </client> </system.serviceModel> The client uses a façade to connect to the services   using System.ServiceModel; using CheckingAccountContract; using ProfileContract; using SavingsAccountContract;   namespace Client { public class ProxyFacade { public static IProfile ProfileProxy() { return (new ChannelFactory<IProfile>("tcpProfile")).CreateChannel(); }   public static ICheckingAccount CheckingAccountProxy() { return (new ChannelFactory<ICheckingAccount>("tcpCheckingAccount")) .CreateChannel(); }   public static ISavingsAccount SavingsAccountProxy() { return (new ChannelFactory<ISavingsAccount>("tcpSavingsAccount")) .CreateChannel(); }   } }   With that in place, lets get our unit tests going   using System; using System.Diagnostics; using BankDAL.Model; using NUnit.Framework; using ProfileContract;   namespace Client { [TestFixture] public class Tests { private void TransferFundsFromSavingsToCheckingAccount(int customerId, decimal amount) { ProxyFacade.CheckingAccountProxy().DepositAmount(customerId, amount); ProxyFacade.SavingsAccountProxy().WithdrawAmount(customerId, amount); }   private void TransferFundsFromCheckingToSavingsAccount(int customerId, decimal amount) { ProxyFacade.SavingsAccountProxy().DepositAmount(customerId, amount); ProxyFacade.CheckingAccountProxy().WithdrawAmount(customerId, amount); }     [Test] public void CreateAndGetProfileTest() { IProfile profile = ProxyFacade.ProfileProxy(); const string customerName = "Tom"; int customerId = profile.CreateCustomer(customerName, "NJ", new DateTime(1982, 1, 1)).Id; Customer customer = profile.GetCustomer(customerId); Assert.AreEqual(customerName,customer.FullName); }   [Test] public void DepositWithDrawAndTransferAmountTest() { IProfile profile = ProxyFacade.ProfileProxy(); string customerName = "Smith" + DateTime.Now.ToString("HH:mm:ss"); var customer = profile.CreateCustomer(customerName, "NJ", new DateTime(1982, 1, 1)); // Deposit to Savings ProxyFacade.SavingsAccountProxy().DepositAmount(customer.Id, 100); ProxyFacade.SavingsAccountProxy().DepositAmount(customer.Id, 25); Assert.AreEqual(125, ProxyFacade.SavingsAccountProxy().GetSavingsAccountBalance(customer.Id)); // Withdraw ProxyFacade.SavingsAccountProxy().WithdrawAmount(customer.Id, 30); Assert.AreEqual(95, ProxyFacade.SavingsAccountProxy().GetSavingsAccountBalance(customer.Id));   // Deposit to Checking ProxyFacade.CheckingAccountProxy().DepositAmount(customer.Id, 60); ProxyFacade.CheckingAccountProxy().DepositAmount(customer.Id, 40); Assert.AreEqual(100, ProxyFacade.CheckingAccountProxy().GetCheckingAccountBalance(customer.Id)); // Withdraw ProxyFacade.CheckingAccountProxy().WithdrawAmount(customer.Id, 30); Assert.AreEqual(70, ProxyFacade.CheckingAccountProxy().GetCheckingAccountBalance(customer.Id));   // Transfer from Savings to Checking TransferFundsFromSavingsToCheckingAccount(customer.Id,10); Assert.AreEqual(85, ProxyFacade.SavingsAccountProxy().GetSavingsAccountBalance(customer.Id)); Assert.AreEqual(80, ProxyFacade.CheckingAccountProxy().GetCheckingAccountBalance(customer.Id));   // Transfer from Checking to Savings TransferFundsFromCheckingToSavingsAccount(customer.Id, 50); Assert.AreEqual(135, ProxyFacade.SavingsAccountProxy().GetSavingsAccountBalance(customer.Id)); Assert.AreEqual(30, ProxyFacade.CheckingAccountProxy().GetCheckingAccountBalance(customer.Id)); }   [Test] public void FundTransfersWithOverDraftTest() { IProfile profile = ProxyFacade.ProfileProxy(); string customerName = "Angelina" + DateTime.Now.ToString("HH:mm:ss");   var customerId = profile.CreateCustomer(customerName, "NJ", new DateTime(1972, 1, 1)).Id;   ProxyFacade.SavingsAccountProxy().DepositAmount(customerId, 100); TransferFundsFromSavingsToCheckingAccount(customerId,80); Assert.AreEqual(20, ProxyFacade.SavingsAccountProxy().GetSavingsAccountBalance(customerId)); Assert.AreEqual(80, ProxyFacade.CheckingAccountProxy().GetCheckingAccountBalance(customerId));   try { TransferFundsFromSavingsToCheckingAccount(customerId,30); } catch (Exception e) { Debug.WriteLine(e.Message); }   Assert.AreEqual(110, ProxyFacade.CheckingAccountProxy().GetCheckingAccountBalance(customerId)); Assert.AreEqual(20, ProxyFacade.SavingsAccountProxy().GetSavingsAccountBalance(customerId)); } } }   We are creating a new instance of the channel for every operation, we will look into instance management and how creating a new instance of channel affects it in subsequent articles. The first two test cases deals with creation of Customer, deposit and withdraw of month between accounts. The last case, FundTransferWithOverDraftTest() is interesting. Customer starts with depositing $100 in SavingsAccount followed by transfer of $80 in to checking account resulting in $20 in savings account.  Customer then initiates $30 transfer from Savings to Checking resulting in overdraft exception on Savings with $30 being deposited to Checking. As we are not running both the requests in transactions the customer ends up with more amount than what he started with $100. In subsequent posts we will look into transactions handling.  Make sure the ServiceHost project is set as start up project and start the solution. Run the test cases either from NUnit client or TestDriven.Net/Resharper which ever is your favorite tool. Make sure you have updated the data base connection string in the ServiceHost config file to point to your local database

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  • Google Chrome: XMLHttpRequest.send() not working while doing POST.

    - by Dave Van den Eynde
    I'm working on an application that allows the user to send a file using a form (a POST request), and that executes a series of GET requests while that file is being uploaded to gather information about the state of the upload. It works fine in IE and Firefox, but not so much in Chrome and Safari. The problem is that even though send() is called on the XMLHttpRequest object, nothing is being requested as can be seen in Fiddler. To be more specific, an event handler is placed on the "submit" event of the form, that places a timeout function call on the window: window.setTimeout(startPolling, 10); and in this function "startPolling" sequence is started that keeps firing GET requests to receive status updates from a web service that returns text/json that can be used to update the UI. Is this a limitation (perhaps security-wise?) on WebKit based browsers? Is this a Chrome bug? (I'm seeing the same behaviour in Safari though).

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  • How can I create a HTTP POST request with Qt 4.6.1?

    - by Tobias Langner
    How can I create a HTTP POST request with some URL encoded parameters using Qt 4.6.1? I figured out that I can create a QNetworkRequest, set all the parameters there and send it via QNetworkAccessManagers post method. But how can I add some URL-encoded parameters to the request? In the end I want to access the Eve API using Qt/C++. A Python example can be found here: http://www.eveonline.com/api/doc/example-python.asp I managed it using something like (still to be refactored and formed into something useful): QNetworkReply *requestApi(QNetworkAccessManager &nwam) { QNetworkRequest request(QUrl("http://api.eve-online.com/account/Characters.xml.aspx")); request.setHeader(QNetworkRequest::ContentTypeHeader,"application/x-www-form-urlencoded"); QByteArray data; QUrl params; params.addQueryItem("userid","user"); params.addQueryItem("apiKey","key"); data.append(params.toString()); data.remove(0,1); QNetworkReply *reply = nwam.post(request,data); return reply; }

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