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  • Can running object be garbage collected?

    - by Kugel
    I have a simple class: public class Runner { public void RunAndForget(RunDelegate method) { ThreadPool.QueueUserWorkItem(new WaitCallback(Run), method); } private void Run(object o) { ((RunDelegate )o).Invoke(); } } And if I use this like so: private void RunSomethingASync() { Runner runner = new Runner(); runner.FireAndForget(new RunDelegate(Something)); } Is there any danger using it like this? My C++ guts tell me that runner object should be destroyed after RunSomethingASync is finished. Am I right? What happens then to the method running on different thread? Or perhaps it is other way around and runner will not be collected? That would be a problem considering I may call RunSomethingASync() many times.

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  • Business Object desgin

    - by Dan
    I have a question about how I setup my BO's. I setup the BO's to contain all of my properties of the object as well as the business logic to satisfy the business rules. I decided to make all of the methods static, but I'm not sure if that was the right decision. Someone told me to split my BO's into an Entity Object of just properties and then a BO of just methods that do business rules, and don't make the methods static. Does anyone have some experience with the way i've set this up? Any examples of how it might work better for future growth? Thanks!

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  • asp:Button is not calling server-side function

    - by Richard Neil Ilagan
    Hi guys, I know that there has been much discussion here about this topic, but none of the threads I got across helped me solve this problem. I'm hoping that mine is somewhat unique, and may actually merit a different solution. I'm instantiating an asp:Button inside a data-bound asp:GridView through template fields. Some of the buttons are supposed to call a server-side function, but for some weird reason, it doesn't. All the buttons do when you click them is fire a postback to the current page, doing nothing, effectively just reloading the page. Below is a fragment of the code: <asp:GridView ID="gv" runat="server" AutoGenerateColumns="false" CssClass="l2 submissions" ShowHeader="false"> <Columns> <asp:TemplateField> <ItemTemplate><asp:Panel ID="swatchpanel" CssClass='<%# Bind("status") %>' runat="server"></asp:Panel></ItemTemplate> <ItemStyle Width="50px" CssClass="sw" /> </asp:TemplateField> <asp:BoundField DataField="description" ReadOnly="true"> </asp:BoundField> <asp:BoundField DataField="owner" ReadOnly="true"> <ItemStyle Font-Italic="true" /> </asp:BoundField> <asp:BoundField DataField="last-modified" ReadOnly="true"> <ItemStyle Width="100px" /> </asp:BoundField> <asp:TemplateField> <ItemTemplate> <asp:Button ID="viewBtn" cssclass='<%# Bind("sid") %>' runat="server" Text="View" OnClick="viewBtnClick" /> </ItemTemplate> </asp:TemplateField> </Columns> </asp:GridView> The viewBtn above should call the viewBtnClick() function on server-side. I do have that function defined, along with a proper signature (object,EventArgs). One thing that may be of note is that this code is actually inside an ASCX, which is loaded in another ASCX, finally loaded into an ASPX. Any help or insight into the matter will be SO appreciated. Thanks! (oh, and please don't mind my trashy HTML/CSS semantics - this is still in a very,very early stage :p)

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  • how to return the current object?

    - by ajsie
    in code igniter you can type: $query = $this->db->query("YOUR QUERY"); foreach ($query->result() as $row) { echo $row->title; echo $row->name; echo $row->body; } i guess that the query method returns the object it's part of. am i correct? if i am, how do you type the line where it returns the object? so what i wonder is how it looks like inside the query method for the above code to be functional. public function query($sql) { // some db logic here with the $sql and saves the values to the properties (title, name and body) return X } with other words, what should X be?

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  • Error in asp.net C#

    - by Ishan
    How to pass Editor1 as Parameter: In my aspx.cs i am giving a call to a function which is in .cs file for the same project, as follows: protected void DropDownList2_SelectedIndexChanged(object sender, EventArgs e) { DropDown abs = new DropDown(); abs.dd(this.DropDownList2, this.DropDownList3); } .CS file code public void dd(DropDownList DropDownList2, DropDownList DropDownList3) { //My code which contains DropDownList2 DropDownList3 and Editor1 } The error that i am getting is: Error 1 The name 'Editor1' does not exist in the current context The way i have passed DropDownList2 and DropDownList3 i am not able to pass Editor1(It is an ajax control). How do i pass it?

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  • Function testing on Netbeans 6.8

    - by ron
    While not a torrent, but some articles can be found on the net about function testing (particularly http://blogs.sun.com/geertjan/entry/gui_testing_on_the_netbeans). However the tools mentioned by them do not seem to be maintained, or don't have a plugin working with the most recent version of Netbeans (6.8). Do you have any function test setup for GUI? What is your level of integration into the development process (IDE integration, ant, etc). Additional candy is that Netbeans is not only the IDE, but the GUI app is also developed for Netbeans 6.8 Platform (so I'm mainly interested in GUI testing NB-platform apps, but tips for any Swing apps in general would be a help too).

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  • Simple question about C++ constant syntax

    - by WilliamLou
    Here is some code copied from Thinking in C++ Vol1 Chapter 10. #include <iostream> using namespace std; int x = 100; class WithStatic { static int x; static int y; public: void print() const { cout << "WithStatic::x = " << x << endl; cout << "WithStatic::y = " << y << endl; } }; what's the meaning of const for the function print()? Thanks!

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  • Reference-counted object is used after it is released

    - by EndyVelvet
    Doing code analysis of the project and get the message "Reference-counted object is used after it is released" on the line [defaults setObject: deviceUuid forKey: @ "deviceUuid"]; I watched this topic Obj-C, Reference-counted object is used after it is released? But the solution is not found. ARC disabled. // Get the users Device Model, Display Name, Unique ID, Token & Version Number UIDevice *dev = [UIDevice currentDevice]; NSString *deviceUuid; if ([dev respondsToSelector:@selector(uniqueIdentifier)]) deviceUuid = dev.uniqueIdentifier; else { NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; id uuid = [defaults objectForKey:@"deviceUuid"]; if (uuid) deviceUuid = (NSString *)uuid; else { CFStringRef cfUuid = CFUUIDCreateString(NULL, CFUUIDCreate(NULL)); deviceUuid = (NSString *)cfUuid; CFRelease(cfUuid); [defaults setObject:deviceUuid forKey:@"deviceUuid"]; } } Please help find the cause.

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  • How to access a field's value in an object using reflection

    - by kentcdodds
    My Question: How to overcome an IllegalAccessException to access the value of a an object's field using reflection. Expansion: I'm trying to learn about reflection to make some of my projects more generic. I'm running into an IllegalAccessException when trying to call field.getValue(object) to get the value of that field in that object. I can get the name and type just fine. If I change the declaration from private to public then this works fine. But in an effort to follow the "rules" of encapsulation I don't want to do this. Any help would be greatly appreciated! Thanks! My Code: package main; import java.lang.reflect.Field; public class Tester { public static void main(String args[]) throws Exception { new Tester().reflectionTest(); } public void reflectionTest() throws Exception { Person person = new Person("John Doe", "555-123-4567", "Rover"); Field[] fields = person.getClass().getDeclaredFields(); for (Field field : fields) { System.out.println("Field Name: " + field.getName()); System.out.println("Field Type: " + field.getType()); System.out.println("Field Value: " + field.get(person)); //The line above throws: Exception in thread "main" java.lang.IllegalAccessException: Class main.Tester can not access a member of class main.Tester$Person with modifiers "private final" } } public class Person { private final String name; private final String phoneNumber; private final String dogsName; public Person(String name, String phoneNumber, String dogsName) { this.name = name; this.phoneNumber = phoneNumber; this.dogsName = dogsName; } } } The Output: run: Field Name: name Field Type: class java.lang.String Exception in thread "main" java.lang.IllegalAccessException: Class main.Tester can not access a member of class main.Tester$Person with modifiers "private final" at sun.reflect.Reflection.ensureMemberAccess(Reflection.java:95) at java.lang.reflect.AccessibleObject.slowCheckMemberAccess(AccessibleObject.java:261) at java.lang.reflect.AccessibleObject.checkAccess(AccessibleObject.java:253) at java.lang.reflect.Field.doSecurityCheck(Field.java:983) at java.lang.reflect.Field.getFieldAccessor(Field.java:927) at java.lang.reflect.Field.get(Field.java:372) at main.Tester.reflectionTest(Tester.java:17) at main.Tester.main(Tester.java:8) Java Result: 1 BUILD SUCCESSFUL (total time: 0 seconds)

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  • how to open many files simultaneously for reading in c

    - by monkeyking
    I'm trying to port some of my c++ code into c. I have the following construct class reader{ private: FILE *fp; alot_of_data data;//updated by read_until() method public: reader(const char*filename) read_until(some conditional dependent on the contents of the file, and the arg supplied) } Im then instantiating hundreds of these object and iterate over them using several 'read_until()' for each file until allfiles is at eof. I'm failing to see any clever way to do this in c, the only solution I can come up with is making an array of FILE pointers, and do the same with all the private member data from my class. But this seems very messy, can I implement the functionality of my class as a function pointer, or anything better, I think I'm missing a fundamental design pattern? The files are way to big to have all in memory, so reading everything from every file is not feasible Thanks

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  • GlassFish JDO and global object

    - by bach
    Hi, I'm thinking about the GlassFish platform for my new app. My app env. doesn't have a big volume of data to handle, but a lot of users writing/reading the same data A very volotile portion of the data updates every 200milsec by diff users. Therefore I'd like that type of data to be in memory only and accessible to the whole app My questions: How do I use a global object in memory with GF? a. use a static variable object - for that I guess I need to make sure GF is running on only 1 JVM -- how to I configure GF to run on 1 jvm? b. use HttpContext - same as a. How do I persist to the DB? a. can I use JDO interface? How do I Schedule tasks to be performed in the future (something like the task queue in GAE) thanks, J.S. Bach

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  • Rails - JSON object with an array?

    - by AnApprentice
    Hello, I'm able to create and send a JSON object like so: @mylist << { :id => item.id, :name => name.id } render :json => { :result => 'success', :mylist => @mylist } That works great. Problem I'm having now is that I need to include users with are 1 or more per item. @mylist << { :id => item.id, :name => name.id, :users => item.users } Where item.users contains a list of (user.id, user.name, user.desc). how do I include an array like users inside a json object? How to build in Rails and then how to parse it with jQuery? Thanks

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  • Group SQL tables in Microsoft SQL Server Management Studio object explorer

    - by MainMa
    I have a table which has approximately sixty tables, and other tables are added constantly. Each table is a part of a schema. A such quantity of tables makes it difficult to use Microsoft SQL Server Management Studio 2008. For example, I must scroll up in object explorer to access database related functions, or scroll down each time I need to access Views or Security features. Is it possible to group several tables to be able to expand or collapse them in Object Explorer? Maybe a folder may be displayed for each schema, letting collapse the folders I don't need to use?

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  • rewrite a function using only pointer increment/decrement

    - by Richard Nguyen
    can anyone help me rewrite the function i wrote below using only points and pointer increment/decrement? I dont have much experience with pointer so I dont know what to do. void reverse(char * s) { int i, l = strlen(s); char c; for(i = 0; i < (l >> 1); i++) { c = s[i]; s[i] = s[l - i - 1]; s[l - i - 1] = c; } } do not use pointer arithmetic or array notation. any help or hint on how to rewrite the function above is appriciated. Thanks!

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  • Naming suggestions for a function returning parent prototype

    - by hevalbaranov
    I'm having a naming trouble with a function which returns parent prototype of specified object. It's being used like this: # Pseudo Code MyClass { super(MyClass,this).constructor.call(.... The problem is that I want to use a word which is as superior as "super", but "super" is reserved even it's undefined. Now I'm using "parent", but the window object has a property named parent. I hate Javascript. What should I name this function? Names have to start with lowercase and have to be short.

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  • While loop within Javascript function

    - by JM4
    I have the following basic function: <script type="text/javascript"> function Form_Data(theForm) { var t=1; while (t<=5) { if (theForm.F[t]FirstName.value == "") { alert("Please enter Fighter 1's First Name."); theForm.F[t]FirstName.focus(); return (false); } t++; } return (true); } </script> The script (js validation) fails using this code. If I remove the [t] and replace with a number (1,2,3,4,etc), the validation works on the appropriate fields. What am I doing wrong?

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  • Binding an Ilist to datagridview containing another object in a field

    - by JaSk
    I have pretty much the same problem as this question http://stackoverflow.com/questions/970741 but in windows forms, can anyone help me solve it? this is my code, so you don't have to check the other question: public class Material { public virtual int id { get; private set; } public virtual string nombre { get; set; } public virtual string unidad { get; set; } public virtual Categorias Categoria { get; set; } public virtual IList Materiales { get; set; } public Material() { Materiales = new List<Materiales>(); } public virtual void AddMateriales(Materiales materiales) { materiales.Material = this; this.Materiales.Add(materiales); } } as you can see I have an object within the IList so when I use the List as the data source for a datagridview I get a object.categoria where I want to get the Categoria.Name property, can anyone help me?. Thanks

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  • Java Session Like Object

    - by scriptmonster
    I have been developing a project and in this project i have designed my code to do the same job after a specified time interval continuously. The job that wanted to be done has a lot of distinct cycles. The interval is small to execute them normally thus i used threads. Until that point everything is clear for me. To decrease the process and information transaction i wanted to put an session like object that holds the given data and provide it to any thread at anytime. With this object i plan to not query the same configuration information from database at everytime but if it exists on the session take it else query and store on session. I'm not sure how to implement this structure. Regards,

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  • The function of service principal names in Active Directory

    - by boxerbucks
    I am thinking about taking a service that runs on multiple servers in my domain currently as "NETWORK SERVICE" and configuring it to run as an AD domain account for various reasons. If I have this one account running the same service under multiple servers, do I need to create SPN's for each of the machines and services it runs? Would I need to worry about creating SPN's at all? If the answer is no, then what is the proper role of an SPN?

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  • Java - how to tell class of an object?

    - by lkm
    Given a method that accepts as a parameter a certain supertype. Is there any way, within that method, to determine the actual class of the object that was passed to it? I.e. if a subtype of the allowable parameter was actually passed, is there a way to find out which type it is? If this isn't possible can someone explain why not (from a language design perspective)? Thanks Update: just to make sure I was clear void doSomething(MyType myType) { //determine if myType is MyType OR one of its subclasses } Since the method signature specifies the parameter as being MyType, then how can one tell if the object is actually a subtype of MyType (and which one).

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  • pinvoke to clutter function

    - by trampster
    I'm trying to pinvoke to a clutter function. The function is defined in the docs as ClutterActor * clutter_texture_new_from_actor (ClutterActor *actor); The code I have is as follows: [DllImport ("libclutter-glx-1.0.so.0")] private static extern IntPtr clutter_texture_new_from_file (string filename, IntPtr errorData); And I call it like this: IntPtr texture = clutter_texture_new_from_file("myImage.jpeg",IntPtr.Zero); however when called like this in monodevelop on ubuntu I get the following error. Unix Transport Error Eventally I would like to get the error reporting working so I can get the gerror result however firstly I need to get past the Unix Transport Error.

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  • Pointers, links, object and reference count

    - by EugeneP
    String a = "a"; // allocate memory and write address of a memory block to a variable String b = "b"; // in a and b hold addresses b = a; // copy a address into b. // Now what? b value is completely lost and will be garbage collected //* next step a = null; // now a does not hold a valid address to any data, // still data of a object exist somewhere, yet we cannot get access to it. Correct me if there's a mistake somewhere in my reflexions. My question is: suppose anInstance object of type Instance has a property ' surname ' anInstance.getSurname() returns "MySurname". now String s = anInstance.getSurname(); anInstance = null; question is - is it true that getSurname value, namely MySurname will not be garbage collected because and only because it has active reference counter 0, and if other properties of anInstance have a zero reference counter, they'll be garbage collected?

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