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  • Abstract Methods in "Product" - Factory Method C#

    - by Regina Foo
    I have a simple class library (COM+ service) written in C# to consume 5 web services: Add, Minus, Divide, Multiply and Compare. I've created the abstract product and abstract factory classes. The abstract product named WS's code: public abstract class WS { public abstract double Calculate(double a, double b); public abstract string Compare(double a, double b); } As you see, when one of the subclasses inherits WS, both methods must be overridden which might not be useful in some subclasses. E.g. Compare doesn't need Calculate() method. To instantiate a new CompareWS object, the client class will call the CreateWS() method which returns a WS object type. public class CompareWSFactory : WSFactory { public override WS CreateWS() { return new CompareWS(); } } But if Compare() is not defined as abstract in WS, the Compare() method cannot be invoked. This is only an example with two methods, but what if there are more methods? Is it stupid to define all the methods as abstract in the WS class? My question is: I want to define abstract methods that are common to all subclasses of WS whereas when the factory creates a WS object type, all the methods of the subclasses can be invoked (overridden methods of WS and also the methods in subclasses). How should I do this?

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  • Rails does not display error messages on a form in a custom method

    - by slythic
    Hi all, I've created a custom method called checkout in my app. I create an order (which is done my adding products to my "cart"), assign it to my client, and then I head to my checkout screen where I confirm the items and enter their customer order number and complete the order (submit). Everything works great except that it doesn't display error messages. I'm able to display a flash error notice (seen in complete_order method) when things go wrong but it doesn't specify the details like a normal form would. The error messages should appear if the customer order number is not unique for that client. Below is the custom method (checkout) related code. Order Model: validates_uniqueness_of :customer_order_number, :scope => :client_id Orders_controller: def checkout @order = current_order end def complete_order @order = current_order respond_to do |format| if @order.update_attributes(params[:order]) @order.complete #sets submitted datetime and state to 'complete' flash[:notice] = 'Thank you! Your order is being processed.' format.html { redirect_to( products_path ) } format.xml { head :ok } else flash[:error] = 'Please review your items' #added to confirm an error is present format.html { redirect_to( checkout_path ) } format.xml { render :xml => @order.errors, :status => :unprocessable_entity } end end end And the form in the checkout view: <% form_for @order, :url => { :controller => "orders", :action => "complete_order" } do |f| %> <%= f.error_messages %> <%= f.text_field :customer_order_number, :label => "Purchase Order Number" %> <p> <%= f.submit 'Complete Order', :confirm => 'Are you sure?' %> <small> or <%= link_to 'cancel', current_cart_path %></small> </p> <% end %> Any idea how I can display the specific error messages? Thank you in advance! -Tony

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  • Calling a method at a specific interval rate in C++

    - by Aetius
    This is really annoying me as I have done it before, about a year ago and I cannot for the life of me remember what library it was. Basically, the problem is that I want to be able to call a method a certain number of times or for a certain period of time at a specified interval. One example would be I would like to call a method "x" starting from now, 10 times, once every 0.5 seconds. Alternatively, call method "x" starting from now, 10 times, until 5 seconds have passed. Now I thought I used a boost library for this functionality but I can't seem to find it now and feeling a bit annoyed. Unfortunately I can't look at the code again as I'm not in possession of it any more. Alternatively, I could have dreamt this all up and it could have been proprietary code. Assuming there is nothing out there that does what I would like, what is currently the best way of producing this behaviour? It would need to be high-resolution, up to a millisecond. It doesn't matter if it blocks the thread that it is executed from or not. Thanks!

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  • How can I call a method given only its name?

    - by mfolnovich
    I'm trying to have method void run( string method ) which would run method in that class. For example: class Foo { public: void run( string method ) { // this method calls method *method* from this class } void bar() { printf( "Function bar\n" ); } void foo2() { printf( "Function foo2\n" ); } } Foo foo; int main( void ) { foo.run( "bar" ); foo.run( "foo2" ); } this would print: Function bar Function foo2 Thanks! :)

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  • asp.net detailsview update method not getting new values

    - by Ali
    Hi all, I am binding a detailsview with objectdatasource which gets the select parameter from the querystring. The detailsview shows the desired record, but when I try to update it, my update method gets the old values for the record (and hence no update). here is my detailsview code: <asp:DetailsView ID="dvUsers" runat="server" Height="50px" Width="125px" AutoGenerateRows="False" DataSourceID="odsUserDetails" onitemupdating="dvUsers_ItemUpdating"> <Fields> <asp:CommandField ShowEditButton="True" /> <asp:BoundField DataField="Username" HeaderText="Username" SortExpression="Username" ReadOnly="true" /> <asp:BoundField DataField="FirstName" HeaderText="First Name" SortExpression="FirstName" /> <asp:BoundField DataField="LastName" HeaderText="Last Name" SortExpression="LastName" /> <asp:BoundField DataField="Email" runat="server" HeaderText="Email" SortExpression="Email" /> <asp:BoundField DataField="IsActive" HeaderText="Is Active" SortExpression="IsActive" /> <asp:BoundField DataField="IsOnline" HeaderText="Is Online" SortExpression="IsOnline" ReadOnly="true" /> <asp:BoundField DataField="LastLoginDate" HeaderText="Last Login" SortExpression="LastLoginDate" ReadOnly="true" /> <asp:BoundField DataField="CreateDate" HeaderText="Member Since" SortExpression="CreateDate" ReadOnly="true" /> <asp:TemplateField HeaderText="Membership Ends" SortExpression="ExpiryDate"> <EditItemTemplate> <asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("ExpiryDate") %>'></asp:TextBox> <cc1:CalendarExtender ID="TextBox1_CalendarExtender" runat="server" Enabled="True" TargetControlID="TextBox1"> </cc1:CalendarExtender> </EditItemTemplate> <InsertItemTemplate> <asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("ExpiryDate") %>'></asp:TextBox> </InsertItemTemplate> <ItemTemplate> <asp:Label ID="Label1" runat="server" Text='<%# Bind("ExpiryDate") %>'></asp:Label> </ItemTemplate> </asp:TemplateField> </Fields> and here is the objectdatasource code: <asp:ObjectDataSource ID="odsUserDetails" runat="server" SelectMethod="GetAllUserDetailsByUserId" TypeName="QMS_BLL.Membership" UpdateMethod="UpdateUserForClient"> <UpdateParameters> <asp:Parameter Name="User_ID" Type="Int32" /> <asp:Parameter Name="firstName" Type="String" /> <asp:Parameter Name="lastName" Type="String" /> <asp:SessionParameter Name="updatedByUser" SessionField="userId" DefaultValue="1" /> <asp:Parameter Name="expiryDate" Type="DateTime" /> <asp:Parameter Name="Email" Type="String" /> <asp:Parameter Name="isActive" Type="String" /> </UpdateParameters> <SelectParameters> <asp:QueryStringParameter DefaultValue="1" Name="User_ID" QueryStringField="User_ID" Type="Int32" /> </SelectParameters> </asp:ObjectDataSource> Is the OnItemUpdating method still required when you have your custom BLL method called on insertevent? (which is being executed fine in my case but updating with the old values) or am I missing something else? Also I tried to provide an OnItemUpdating method and in there I tried to capture the contents of the textboxes (the new values). I got an exception: "Specified argument was out of the range of valid values. Parameter name: index" when I tried to do: TextBox txtFirstName = (TextBox)dvUsers.Rows[1].Cells[1].Controls[0]; Any help will be most appreciated.

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  • Is there a way to give a subquery an alias in Oracle 10g SQL?

    - by Matt Pascoe
    Is there a way to give a subquery in Oracle 11g an alias like: select * from (select client_ref_id, request from some_table where message_type = 1) abc, (select client_ref_id, response from some_table where message_type = 2) defg where abc.client_ref_id = def.client_ref_id; Otherwise is there a way to join the two subqueries based on the client_ref_id. I realize there is a self join, but on the database I am running on a self join can take up to 5 min to complete (there is some extra logic in the actual query I am running but I have determined the self join is what is causing the issue). The individual subqueries only take a few seconds to complete by them selves. The self join query looks something like: select st.request, st1.request from some_table st, some_table st1 where st.client_ref_id = st1.client_ref_id;

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  • Is there a way to give a subquery an alias in Oracle 11g SQL?

    - by Matt Pascoe
    Is there a way to give a subquery in Oracle 11g an alias like: select * from (select client_ref_id, request from some_table where message_type = 1) abc, (select client_ref_id, response from some_table where message_type = 2) defg where abc.client_ref_id = def.client_ref_id; Otherwise is there a way to join the two subqueries based on the client_ref_id. I realize there is a self join, but on the database I am running on a self join can take up to 5 min to complete (there is some extra logic in the actual query I am running but I have determined the self join is what is causing the issue). The individual subqueries only take a few seconds to complete by them selves. The self join query looks something like: select st.request, st1.request from some_table st, some_table st1 where st.client_ref_id = st1.client_ref_id;

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  • Is there a convenient method to pull files from a server in an SSH session?

    - by tel
    I often SSH into a cluster node for work and after processing want to pull several results back to my local machine for analysis. Typically, to do this I use a local shell to scp from the server, but this requires a lot of path manipulation. I'd prefer to use a syntax like interactive FTP and just 'pull' files from the server to my local pwd. Another possible solution might be to have some way to automatically set up my client computer as an ssh alias so that something like scp results home:~/results would work as expected. Is there any obscure SSH trick that'll do this for me? Working from grawity's answer, a complete solution in config files is something like local .ssh/config: Host ex HostName ssh.example.com RemoteForward 10101 localhost:22 ssh.example.com .ssh/config: Host home HostName localhost Port 10101 which lets me do commands exactly like scp results home: transferring the file results to my home machine.

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  • The extern alias 'xxx' was not specified in a /reference option

    - by Brian Ensink
    I have two assemblies that unfortunately define the same type in the same namespace. I'm trying to use a an extern alias to work around the problem. In the Visual Studio IDE I have set the "Aliases" property of the reference to my alias. This is supposed to change the C# compiler command line to be something like this: /reference:MyAlias=MyAssembly.dll But it doesn't actually do that. The Visual Studio IDE seems to just ignore the Aliases property setting on the reference. So when I go and add the line extern alias MyAlias; at the top of my C# code file I get the error that the alias was not specified in a /reference option to the compiler. I can't figure out what I am doing wrong. Any ideas?

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  • Does Java support dynamic method invocation?

    - by eSKay
    class A { void F() { System.out.println("a"); }} class B extends A { void F() { System.out.println("b"); }} public class X { public static void main(String[] args) { A objA = new B(); objA.F(); } } Here, F() is being invoked dynamically, isn't it? This article says ... the Java bytecode doesn’t support dynamic method invocation. There are three supported invocations modes : invokestatic, invokespecial, invokeinterface or invokevirtual. These modes allows to call methods with known signature. We talk of strongly typed language. This allows to to make some checks directly at compile time. On the other side, the dynamic languages use dynamic types. So we can call a method unknown at the compile time, but that’s completely impossible with the Java bytecode. What am I missing?

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  • Java and junit: derivative of polynomial method testing issue

    - by Curtis
    Hello all, im trying to finish up my junit testing for finding the derivative of a polynomial method and im having some trouble making it work. here is the method: public Polynomial derivative() { MyDouble a = new MyDouble(0); MyDouble b = this.a.add(this.a); MyDouble c = this.b; Polynomial poly = new Polynomial (a, b, c); return poly; } and here is the junit test: public void testDerivative() { MyDouble a = new MyDouble(2), b = new MyDouble(4), c = new MyDouble(8); MyDouble d = new MyDouble(0), e = new MyDouble(4), f = new MyDouble(4); Polynomial p1 = new Polynomial(a, b, c); Polynomial p2 = new Polynomial(d,e,f); assertTrue(p1.derivative().equals(p2)); } im not too sure why it isnt working...ive gone over it again and again and i know im missing something. thank you all for any help given, appreciate it

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  • Equivalent to Bash Alias in Powershell

    - by RightFullRudder
    Hi there, a newbie powershell question: I'd like to make an alias in powershell exactly equivalent to this Bash alias: alias django-admin-jy="jython /path/to/jython-dev/dist/bin/django-admin.py" In tinkering with it so far, I've found this to be very difficult. -Powershell Aliases only work with Powershell commands + function calls -No clear way to allow for an unlimited number of args on a powershell function call -Powershell seems to block stdout

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  • How to find minimum of nonlinear, multivariate function using Newton's method (code not linear algeb

    - by Norman Ramsey
    I'm trying to do some parameter estimation and want to choose parameter estimates that minimize the square error in a predicted equation over about 30 variables. If the equation were linear, I would just compute the 30 partial derivatives, set them all to zero, and use a linear-equation solver. But unfortunately the equation is nonlinear and so are its derivatives. If the equation were over a single variable, I would just use Newton's method (also known as Newton-Raphson). The Web is rich in examples and code to implement Newton's method for functions of a single variable. Given that I have about 30 variables, how can I program a numeric solution to this problem using Newton's method? I have the equation in closed form and can compute the first and second derivatives, but I don't know quite how to proceed from there. I have found a large number of treatments on the web, but they quickly get into heavy matrix notation. I've found something moderately helpful on Wikipedia, but I'm having trouble translating it into code. Where I'm worried about breaking down is in the matrix algebra and matrix inversions. I can invert a matrix with a linear-equation solver but I'm worried about getting the right rows and columns, avoiding transposition errors, and so on. To be quite concrete: I want to work with tables mapping variables to their values. I can write a function of such a table that returns the square error given such a table as argument. I can also create functions that return a partial derivative with respect to any given variable. I have a reasonable starting estimate for the values in the table, so I'm not worried about convergence. I'm not sure how to write the loop that uses an estimate (table of value for each variable), the function, and a table of partial-derivative functions to produce a new estimate. That last is what I'd like help with. Any direct help or pointers to good sources will be warmly appreciated. Edit: Since I have the first and second derivatives in closed form, I would like to take advantage of them and avoid more slowly converging methods like simplex searches.

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  • Java input method for Virtual Keyboad

    - by shekhar
    Hi, I am facing problem in implementing Input method for Virtual Keyboard, currently I am using robot class for sending input to any application from virtual keyboard. but for that I need to create mapping of key-code and unicode, which is not consistent on different keyboard layout, can I directly pass the UNICODE to any application using Input method without worry about mapping between keycode and unicode. any useful link or sample code will be useful. It is simple Java program which is always on top of any application and work as onscreen keyboard. using a mouse while you press any button (key) of the keyboard, the corresponding character will be typed in the application running below. This is working perfectly for English Alphabets. I am facing problem while I am doing for unicode.

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  • Objective-C method implementation nuances

    - by altdotnetgeek
    I have just started to develop for the iPhone and am in the process of learning Objective-C. I have seen some code that implements a method in the @implementation side of a class like this: -(void)myMethod; { // method body } What makes this interesting is that there is no mention of myMethod in the @interface for the class. I tried a sample project with this and when I compile I get a warning from XCode that myMethod may not be seen by the calling code. Can anyone tell me what is going on? Thanks!

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  • execute javascript method after completing code behind method ?

    - by James123
    I can execute below callback() method after completion of document.getElementById('btnDownload').click(); .This Click is Code behind method. Now it is executing immediatly. I want wait "Click()" process done then Execute callback(); method. function LoadPopup() { // find the popup behavior this._popup = $find('mdlPopup'); // show the popup this._popup.show(); // synchronously run the server side validation ... document.getElementById('btnDownload').click(); callback(); } function callback() { this._popup = $find('mdlPopup'); // hide the popup this._popup.hide(); alert("hi"); }

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  • Java method overloading + double dispatch

    - by Max
    Can anybody explain in detail the reason the overloaded method print(Parent parent) is invoked when working with Child instance in my test piece of code? Any pecularities of virtual methods or methods overloading/resolution in Java involved here? Any direct reference to Java Lang Spec? Which term describes this behaviour? Thanks a lot. public class InheritancePlay { public static class Parent { public void doJob(Worker worker) { System.out.println("this is " + this.getClass().getName()); worker.print(this); } } public static class Child extends Parent { } public static class Worker { public void print(Parent parent) { System.out.println("Why this method resolution happens?"); } public void print(Child child) { System.out.println("This is not called"); } } public static void main(String[] args) { Child child = new Child(); Worker worker = new Worker(); child.doJob(worker); } }

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  • overriding protected internal with protected!

    - by Asad Butt
    This is an extension for this question asked an hour ago. We cannot modify the access modifiers, when overriding a virtual method in derived class. Consider Control class in System.Web.UI namespace public class Control : IComponent, IDisposable,... { protected internal virtual void CreateChildControls() { } . . } Now Consider This public class someClass : System.Web.UI.Control { // This should not compile but it does protected override void CreateChildControls() { } // This should compile but it does not protected internal override void CreateChildControls() { } } can any body explain this ? Thanks

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  • nginx serving php for download (previously: nginx multiple location alias 404)

    - by torsten
    Im having issues with the alias location in the following configuration server { listen 80; server_name localhost; root /srv/http/share; index index.php; include php.conf; location / { try_files $uri $uri/ /index.php$is_args$args; } location /phpmemcachedadmin { alias /srv/http/phpmemcachedadmin; } location /webgrind { alias /srv/http/webgrind; } } while / works well, im getting a 404 for /webgrind and /phpmemcachedadmin. If i switch the root directory to /srv/http and alias the / location, die /phpmemcachedadmin and webgrind work, but not the / location. UPDATE: I managed the probems getting all location to work, so here is the updated config #user html; worker_processes 2; #error_log logs/error.log; #error_log logs/error.log notice; #error_log logs/error.log info; #pid logs/nginx.pid; events { worker_connections 1024; } http { include mime.types; default_type application/octet-stream; sendfile on; keepalive_timeout 65; gzip on; server { listen 80; server_name localhost; location / { root /srv/http/share; index index.php; try_files $uri $uri/ /index.php$is_args$args; include php.conf; } location /phpmemcachedadmin { root /srv/http; index index.php; try_files $uri $uri/ /index.php$is_args$args; include php.conf; } location /webgrind { root /srv/http; index index.php; try_files $uri $uri/ /index.php$is_args$args; include php.conf; } } } The php.conf looks like this: location ~ \.php$ { try_files $uri =404; fastcgi_pass unix:/run/php-fpm/php-fpm.sock; fastcgi_index index.php; include fastcgi.conf; } while the fastcgi.conf like this: fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name; fastcgi_param QUERY_STRING $query_string; fastcgi_param REQUEST_METHOD $request_method; fastcgi_param CONTENT_TYPE $content_type; fastcgi_param CONTENT_LENGTH $content_length; fastcgi_param SCRIPT_NAME $fastcgi_script_name; fastcgi_param REQUEST_URI $request_uri; fastcgi_param DOCUMENT_URI $document_uri; fastcgi_param DOCUMENT_ROOT $document_root; fastcgi_param SERVER_PROTOCOL $server_protocol; fastcgi_param HTTPS $https if_not_empty; fastcgi_param GATEWAY_INTERFACE CGI/1.1; fastcgi_param SERVER_SOFTWARE nginx/$nginx_version; fastcgi_param REMOTE_ADDR $remote_addr; fastcgi_param REMOTE_PORT $remote_port; fastcgi_param SERVER_ADDR $server_addr; fastcgi_param SERVER_PORT $server_port; fastcgi_param SERVER_NAME $server_name; # PHP only, required if PHP was built with --enable-force-cgi-redirect fastcgi_param REDIRECT_STATUS 200; But there is a problem serving phpmemcachedadmin. If i call localhost/phpmemcachedadmin/index.php it works quite well (i get a log that i got served the file in access log). On the other hand, if i just call localhost/phpmemcachedadmin/ he serves me the file for download. Neither the error.log nor the access.log log anything when i get served the the file for download. Any ideas?

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  • Apache, ISPConfig & Roundcube alias

    - by Jay Zus
    I'm using ISPConfig to setup all the websites on my server but I also like to try to fiddle with the files myself to see how it works. Like you guessed, yes, I've broken something. I can't access my webmail setup by default on the server with the alias /webmail (I access it via the http://xxx.xxx.xx.xx/webmail) Firefox tells me that The page isn't redirecting properly Firefox has detected that the server is redirecting the request for this address in a way that will never complete. So I cleaned up my vhost files and the one of my websites work as intended, I think that the problem comes from my default.vhost. Here's the content of it <Directory /var/www/> AllowOverride None Order Deny,Allow Deny from all </Directory> <VirtualHost *:80> DocumentRoot /var/www/ ServerAdmin [email protected] <Directory /var/www/> Options FollowSymLinks AllowOverride All Order allow,deny Allow from all </Directory> </VirtualHost> This isn't a lot and I can't really see what's wrong with it, all I know is that it isn't the one that came with ISPConfig and I can't find an original one. Here's the roundcube.conf that loads with apache # Those aliases do not work properly with several hosts on your apache server # Uncomment them to use it or adapt them to your configuration # Alias /roundcube/program/js/tiny_mce/ /usr/share/tinymce/www/ # Alias /roundcube /var/lib/roundcube Alias /webmail /var/lib/roundcube/ # Access to tinymce files <Directory "/usr/share/tinymce/www/"> Options Indexes MultiViews FollowSymLinks AllowOverride None Order allow,deny allow from all </Directory> <Directory /var/lib/roundcube/> Options +FollowSymLinks # This is needed to parse /var/lib/roundcube/.htaccess. See its # content before setting AllowOverride to None. AllowOverride All order allow,deny allow from all </Directory> # Protecting basic directories: <Directory /var/lib/roundcube/config> Options -FollowSymLinks AllowOverride None </Directory> <Directory /var/lib/roundcube/temp> Options -FollowSymLinks AllowOverride None Order allow,deny Deny from all </Directory> <Directory /var/lib/roundcube/logs> Options -FollowSymLinks AllowOverride None Order allow,deny Deny from all </Directory> I didn't touch that file, but I guess it has something to do with the problem. I just can't find why it doesn't work. EDIT: This is the errors in my apache's log [21/Jun/2013:21:10:54 +0200] "GET /webmail/ HTTP/1.1" 302 540 "-" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:21.0) Gecko/20100101 Firefox/21.0" [21/Jun/2013:21:10:54 +0200] "GET /webmail/ HTTP/1.1" 302 475 "-" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:21.0) Gecko/20100101 Firefox/21.0" [21/Jun/2013:21:10:54 +0200] "GET /webmail/ HTTP/1.1" 302 475 "-" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:21.0) Gecko/20100101 Firefox/21.0" [21/Jun/2013:21:10:54 +0200] "GET /webmail/ HTTP/1.1" 302 475 "-" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:21.0) Gecko/20100101 Firefox/21.0" [21/Jun/2013:21:10:54 +0200] "GET /webmail/ HTTP/1.1" 302 475 "-" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:21.0) Gecko/20100101 Firefox/21.0" [21/Jun/2013:21:10:54 +0200] "GET /webmail/ HTTP/1.1" 302 475 "-" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:21.0) Gecko/20100101 Firefox/21.0" [21/Jun/2013:21:10:54 +0200] "GET /webmail/ HTTP/1.1" 302 475 "-" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:21.0) Gecko/20100101 Firefox/21.0"

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  • intelligent thin start with port alias for bash

    - by seaofclouds
    i would like a single alias (ts) which starts my local development server. the script should test for an open port starting at 3000 and use the first available port. additionally, some sites require a rackup file, making -R config.ru necessary. this script should check the current directory for the config.ru file and add that to the alias if present. currently, to start my local development environment, i run: alias ts="thin -R config.ru -p 3000 start" often, i need to run several servers to test different sites, so i've created additional aliases: alias ts1="thin -R config.ru -p 3001 start"

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