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  • Why does Java not have any destructor like C++?

    - by Abhishek Jain
    Java has its own garbage collection implementation so it does not require any destructor like C++ . This makes Java developer lazy in implementing memory management. And Garbage Collection is very expensive. Still we can have destructor along with garbage collector where developer can free resources and which can save garbage collector's work. This might improves the performance of application. Why does Java not provide any destructor kind of mechanism? Developer does not have control over GC but he/she can control or create object. Then why not give them ability to destruct the objects?

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  • COMET chat application - IIS7 slows down over time

    - by Yaron
    I have built a chat application which uses this code to push messages to clients (web pages) and to monitor online users and their information. Basically, the code creates and manages a custom thread pool for maintaining the list of connected users & their state. The application was hosted on a shared hosting account (IIS6), and worked fine. After moving the site (ASP.Net App) to a dedicated virtual server it seems I have a problem where IIS7 gets slower and slower as time passes, and my only "solution" is to restart IIS. I am trying to look at the performance counters and have do idea on which one to look.

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  • Sql CLR calling webservice throws exception

    - by TonyP
    I have clr stored procedure that calls a Webservice method. Webmethod in turn call a com object .. and do some processing on a remote Unix server. When I invoke webmethod by it self it works fine. But when called from the CLR I get the following exception.. What am I doing wrong ? Msg 6522, Level 16, State 1, Procedure PrintOa, Line 0 A .NET Framework error occurred during execution of user-defined routine or aggregate "PrintOa": System.Security.HostProtectionException: Attempted to perform an operation that was forbidden by the CLR host. The protected resources (only available with full trust) were: All The demanded resources were: Synchronization System.Security.HostProtectionException: at System.Reflection.MethodBase.PerformSecurityCheck(Object obj, RuntimeMethodHandle method, IntPtr parent, UInt32 invocationFlags) at System.Reflection.RuntimeConstructorInfo.Invoke(BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) at System.Diagnostics.TraceUtils.GetRuntimeObject(String className, Type baseType, String initializeData) at System.Diagnostics.TypedElement.BaseGetRuntimeObject() at System.Diagnostics.ListenerElement.GetRuntimeObject() at System.Diagnostics.ListenerElementsCollection.GetRuntimeObject() at System.Diagnostics.TraceInternal.get_Listeners() at System.Diagnostics.TraceInternal.WriteLine(Object value) at System.Diagnostics.Debug.WriteLine(Object value) at BaaNOA.PrintOA(String trid)

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  • Wpf Listbox and CheckBox

    - by Tan
    Hi iam using a listbox to show a list of items. in the listbox i ahve an togglebutton on every item. When i click on the toggle button the state of the togglebutton is pressed. But when i am scrolling down in the listbox and scolls up again. The togglebutton state is not pressed. How can i prevent this please help. Heres my itemtemplate <ListBox.ItemTemplate> <DataTemplate> <StackPanel Margin="0,3,0,0"> <Border BorderBrush="Black" BorderThickness="1,1,1,1"> <Border.Background> <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0" MappingMode="RelativeToBoundingBox"> <GradientStop Color="#FFECECEC" Offset="1"/> <GradientStop Color="#FFE8E8E8"/> <GradientStop Color="#FFBDBDBD" Offset="0.153"/> <GradientStop Color="#FFE8E8E8" Offset="0.904"/> </LinearGradientBrush> </Border.Background> <Border.Style> <Style> <Style.Triggers> <DataTrigger Binding="{Binding Path=IsSelected, RelativeSource={RelativeSource Mode=FindAncestor,AncestorType={x:Type ListBoxItem}}}" Value="True"> <Setter Property="Border.Height" Value="100"/> <Setter Property="Border.Background"> <Setter.Value> <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0" MappingMode="RelativeToBoundingBox"> <GradientStop Color="DarkGray" Offset="1"/> <GradientStop Color="#FFE8E8E8"/> <GradientStop Color="#FFBDBDBD" Offset="0.153"/> <GradientStop Color="DarkGray" Offset="0.904"/> </LinearGradientBrush> </Setter.Value> </Setter> </DataTrigger> </Style.Triggers> </Style> </Border.Style> <StackPanel Orientation="Horizontal" VerticalAlignment="Center"> <Grid> <Grid.ColumnDefinitions> <ColumnDefinition Width="500"/> <ColumnDefinition Width="100"/> <ColumnDefinition Width="55"/> </Grid.ColumnDefinitions> <!--Pick number--> <StackPanel Grid.Column="0" VerticalAlignment="Center" Orientation="Vertical"> <TextBlock Text="{Binding Path=FtgNamn}" FontWeight="Bold" FontSize="22pt" FontFamily="Calibri"/> <TextBlock Text="{Binding Path=LevsAttBeskr}" FontSize="18pt" FontFamily="Calibri"/> </StackPanel> <!--Pick Quantity--> <StackPanel Grid.Column="1" VerticalAlignment="Center"> <TextBlock Text="{Binding Path=Antal}" FontSize="44pt" FontFamily="Calibri"/> </StackPanel> <!-- Checkbox--> <StackPanel Grid.Column="2" VerticalAlignment="Center" HorizontalAlignment="Center"> <ToggleButton Name="Check" Width="40" Height="40" Click="Check_Click" Tag="{Binding Path=Plocklista}"> <ToggleButton.Style> <Style TargetType="ToggleButton"> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type ToggleButton}"> <Border x:Name="InnerBorder" Background="White" BorderBrush="Black" BorderThickness="1"/> <ControlTemplate.Triggers> <Trigger Property="IsChecked" Value="True"> <Setter TargetName="InnerBorder" Property="Background"> <Setter.Value> <ImageBrush ImageSource="/Images/button_ok.png"/> </Setter.Value> </Setter> <Setter TargetName="InnerBorder" Property="BorderThickness" Value="0"/> </Trigger> </ControlTemplate.Triggers> </ControlTemplate> </Setter.Value> </Setter> </Style> </ToggleButton.Style> </ToggleButton> </StackPanel> </Grid> <Border BorderBrush="Darkgray" BorderThickness="0,0,1,0"> </Border> <TextBlock Width="100" Text="{Binding Path=Quantity}" FontSize="44pt" FontFamily="Calibri"/> <CheckBox Width="78"/> </StackPanel> </Border> </StackPanel> </DataTemplate>

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  • Making sure unsigned int/long always execute in checked context in C#

    - by theburningmonk
    Has anyone found it strange that the default context for uint and ulong is unchecked rather than checked considering that they are meant to represent values that can never be negative? So if some code is trying to violate that constraint it seems to me the natural and preferred behaviour would be to throw an exception rather than returning the max value instead (which can easily leave important pieces of data in an invalid state and impossible to revert..). Is there an existing attribute which can be applied to either class/assembly so that it always performs arithmetic operations in a checked context? I was thinking of writing one myself (as an aspect using PostSharp) but would be great if there's one already. Many thanks,

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  • tools for testing vim plugins

    - by intuited
    I'm looking for some tools for testing vim scripts. Either vim scripts that do unit/functional testing, or classes for some other library (eg Python's unittest module) that make it convenient to run vim with parameters that cause it to do some tests on its environment, and determine from the output whether or not a given test passed. I'm aware of a couple of vim scripts that do unit testing, but they're sort of vaguely documented and may or may not actually be useful: vim-unit: purports "To provide vim scripts with a simple unit testing framework and tools" first and only version (v0.1) was released in 2004 documentation doesn't mention whether or not it works reliably, other than to state that it is "fare [sic] from finished". unit-test.vim: This one also seems pretty experimental, and may not be particularly reliable. May have been abandoned or back-shelved: last commit was in 2009-11 ( 6 months ago) No tagged revisions have been created (ie no releases) So information from people who are using one of those two existent modules, and/or links to other, more clearly usable, options, are very welcome.

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  • iphone tabbar with custom buttons and scrollvie

    - by chunjai
    i'm trying to get a tab bar effect not unlike russel quinn's 'creative review' app. the tabbar swipes across, which i have figured out, but the tabbar style itself is unlike anything i've seen on the iphone (though it looks so simple!). it has square buttons with a space between, and each button has a select/active/inactive state. i'm having a hard time seeing how this can be tabbar, but i don't know any other way. can someone explain this? here's the example :: http://bit.ly/c8CeBC. any help is appreciated.

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  • How to index a date column with null values?

    - by Heinz Z.
    How should I index a date column when some rows has null values? We have to select rows between a date range and rows with null dates. We use Oracle 9.2 and higher. Options I found Using a bitmap index on the date column Using an index on date column and an index on a state field which value is 1 when the date is null Using an index on date column and an other granted not null column My thoughts to the options are: to 1: the table have to many different values to use an bitmap index to 2: I have to add an field only for this purpose and to change the query when I want to retrieve the null date rows to 3: locks tricky to add an field to an index which is not really needed What is the best practice for this case? Thanks in advance Some infos I have read: Oracle Date Index When does Oracle index null column values?

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  • foreign key constraints on primary key columns - issues ?

    - by zzzeek
    What are the pros/cons from a performance/indexing/data management perspective of creating a one-to-one relationship between tables using the primary key on the child as foreign key, versus a pure surrogate primary key on the child? The first approach seems to reduce redundancy and nicely constrains the one-to-one implicitly, while the second approach seems to be favored by DBAs, even though it creates a second index: create table parent ( id integer primary key, data varchar(50) ) create table child ( id integer primary key references parent(id), data varchar(50) ) pure surrogate key: create table parent ( id integer primary key, data varchar(50) ) create table child ( id integer primary key, parent_id integer unique references parent(id), data varchar(50) ) the platforms of interest here are Postgresql, Microsoft SQL Server.

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  • Security Exception while running sites using subdomain?

    - by lmenaria
    I have 3 sites : media.lmenaria.com - Hosting Images webservice.lmenaria.com - Sending images url from database. www.lmenaria.com - Host Silverlight application and display images. When I run page "http://www.lmenaria.com/silverlight.aspx". I am getting below exception. So what shpould I do ? System.Security.SecurityException: Security error. at System.Net.Browser.BrowserHttpWebRequest.InternalEndGetResponse(IAsyncResult asyncResult) at System.Net.Browser.BrowserHttpWebRequest.<c_DisplayClass5.b_4(Object sendState) at System.Net.Browser.AsyncHelper.<c_DisplayClass2.b_0(Object sendState) at System.Net.Browser.AsyncHelper.BeginOnUI(SendOrPostCallback beginMethod, Object state) at System.Net.Browser.BrowserHttpWebRequest.EndGetResponse(IAsyncResult asyncResult) at System.Net.WebClient.GetWebResponse(WebRequest request, IAsyncResult result) at System.Net.WebClient.OpenReadAsyncCallback(IAsyncResult result) I think, my all sites runing at same domain, so I don't need crossdomain xmls. Please let me know how Can I fix it. I have tried to put corssdoamin xml media.lmenaria.com,webservice.lmenaria.com both, and working fine, but only at www.lmenaria.com not working. We are downloading images using WebClient. Thanks in advance, Laxmilal Menaria

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  • compiler warning on (ambiguous) method resolution with named parameters

    - by FireSnake
    One question regarding whether the following code should yield a compiler warning or not (it doesn't). It declares two methods of the same name/return type, one has an additional named/optional parameter with default value. NOTE: technically the resolution isn't ambiguous, because the rules clearly state that the first method will get called. See here, Overload resolution, third bullet point. This behavior is also intuitive to me, no question. public void Foo(int arg) { ... } public void Foo(int arg, bool bar = true) { ...} Foo(42); // shouldn't this give a compiler warning? I think a compiler warning would be kind of intuitive here. Though the code technically is clean (whether it is a sound design is a different question:)).

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  • How to implement a Google-chrome-like title bar for Java SWT application

    - by MartyC
    I have inherited development of a Java/SWT application running on Windows only. One of the feature requests that I need to scope is a Google-chrome-type title bar in place of the SWT windows title bar. The application's tabs appear at the same level as the window control buttons. My understanding is that I will need to: write a Windows widget capable of rendering the custom look and managing tabs as opposed to menus. expose the Windows widget as a dll for use in Java via JNI write a custom SWT widget to wrap it and expose the tab management interface. I have a lot of experience with Java programming, GUI programming with Swing/AWT, and non-GUI C# programming. Windows GUI programming and SWT are new to me so I'm not sure where to start. The best I have found so far is a 2001 article on writing your own SWT widget. My biggest unknown is the best way to implement a custom Windows application-window.

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  • Is there any software made by microsoft using .NET?

    - by SnOrfus
    I've been reading some blogs and articles lately and one thing I noticed a couple of times was authors stating that Microsoft 'doesn't use their own technologies' with respect to developing applications using the .NET framework (specifically, desktop applications). There's not a whole lot of information that I can see as to what platforms their products are developed with. I had heard that Media Center has some .NET code, but not 100%, likewise with SQL Server Management Studio. So the question I ask is, does anyone know of any software, made by Microsoft that is 100% .NET code?

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  • What is the best way to migrate documents into Sharepoint (MOSS) 2007?

    - by Jeramie Mercker
    I'm working with a customer that needs to migrate documents from their current document management system (not Sharepoint) into Sharepoint MOSS 2007 retaining document history and metadata. I've written a proof of concept using the Sharepoint web services and that looks promising, but the snag so far seems to be programmatically setting the created date/time and user. The webservices allow the fields to be set but implicitly override them to be the currently logged in user + date/time. For obvious reasons, I need to be able to keep the original created date/time and user on migration. Does anyone know the best way to approach this problem?

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  • How does Linux blocking I/O actually work?

    - by tgguy
    In Linux, when you make a blocking i/o call like read or accept, what actually happens? My thoughts: the process get taken out of the run queue, put into a waiting or blocking state on some wait queue. Then when a tcp connection is made (for accept) or the hard drive is ready or something for a file read, a hardware interrupt is raised which lets those processes waiting to wake up and run (in the case of a file read, how does linux know what processes to awaken, as there could be lots of processes waiting on different files?). Or perhaps instead of hardware interrupts, the individual process itself polls to check availability. Not sure, help?

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  • @@TRANCOUNT and a current connection

    - by AspOnMyNet
    Assume I connect to SQL server 2008 via SQL Server Management Studio ( SSMS ) and open new window W1 by clicking on New Query tab and write the following inside W1: BEGIN TRANSACTION; If I execute this statement 5 times, and then write (inside W1) SELECT @@TRANCOUNT; , then the value returned will be 5. But if I open another window W2 ( inside the same SSMS instance and thus on the same connection ) and write inside W2 SELECT @@TRANCOUNT; then value returned will be 0. @@TRANCOUNT variable returns the number of active transactions for the current connection. Both W1 and W2 windows were opened on the same connection, so shouldn’t ( according to the above quote ) in both W1 and W2 variable @@TRANCOUNT hold the same value? thanx

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  • Do invisible controls and their children on an ASP.NET page contribute to viewstate?

    - by Mr. Jefferson
    I have an ASP.NET page that has about 40 custom controls embedded in it. The controls vary in size; in their .ascx files, the biggest is about 1,500 lines and the smaller ones are between 100 and 200 lines (markup, script, etc). Each control is contained in a Panel. Only one of these panels is ever visible at any one time, which means only one control is ever visible at one time. My question is this: do the controls that are invisible still send ViewState for themselves and all their children to the client? It makes sense that they might have to serialize the fact that they're invisible, but not all the state info for their children...

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  • Spring Hibernate Connection through AOP standalone application

    - by Kiran
    I am trying to develop Annotation based Spring Hibernate standalone application to connect to DB. I've gone through the some blogs and wondered like we should not make use of hibernateTemplate becoz coupling your application tightly to the spring framework. For this reason, Spring recommends that HibernateTemplate no longer be used.Further more my requirement is changed to Spring Hibernate with AOP using Declarative Transaction management.I am new to AOP concepts. Can any one please give an example on Spring Hibernate Connection through AOP. That would be a great help to me. Thanks in advance.

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  • iOS - Application logging test and production code

    - by Peter Warbo
    I am doing a bunch of logging when I'm testing my application which is useful for getting information about variable state and such. However I have read that you should use logging sparsely in production code (because it can potentially slow down your application). But my question is now: if my app is in production and people are using it, whenever a crash (god forbid) occurs, how will I be able to interpret the crash information if I have removed the logging statements? Then I suppose I will only have a stacktrace for me to interpret? Does this mean I should leave logging in production code only WHERE it's really essential for me to interpret what has happened? Also how will the logging statements relate to the crash reports? Will they be combined? I'm thinking of using Flurry as analytics and crash reports...

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  • GCC/XCode equivalent of _CrtCheckMemory?

    - by Chris Becke
    When dealing with random memory overwrites, in MSVC it is possible to validate the state of the heap at various points with a call to _CrtCheckMemory, and know with at least a small level of confidence that the code up until the check was not responsible for any errors that might cause new or malloc to fail later. In XCode, whats the equivalent way to try and box in a memory overwrite? All I have at the moment is a random failure of a call to new, somewhere deep in the bowels of some code with no real idea of how long the code has been running with a corrupt heap up until that point.

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  • An Actor "queue" ?

    - by synic
    In Java, to write a library that makes requests to a server, I usually implement some sort of dispatcher (not unlike the one found here in the Twitter4J library: http://github.com/yusuke/twitter4j/blob/master/twitter4j-core/src/main/java/twitter4j/internal/async/DispatcherImpl.java) to limit the number of connections, to perform asynchronous tasks, etc. The idea is that N number of threads are created. A "Task" is queued and all threads are notified, and one of the threads, when it's ready, will pop an item from the queue, do the work, and then return to a waiting state. If all the threads are busy working on a Task, then the Task is just queued, and the next available thread will take it. This keeps the max number of connections to N, and allows at most N Tasks to be operating at the same time. I'm wondering what kind of system I can create with Actors that will accomplish the same thing? Is there a way to have N number of Actors, and when a new message is ready, pass it off to an Actor to handle it - and if all Actors are busy, just queue the message?

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  • Nesting queries in SQL

    - by ZAX
    The goal of my query is to return the country name and its head of state if it's headofstate has a name starting with A, and the capital of the country has greater than 100,000 people utilizing a nested query. Here is my query: SELECT country.name as country, (SELECT country.headofstate from country where country.headofstate like 'A%') from country, city where city.population > 100000; I've tried reversing it, placing it in the where clause etc. I don't get nested queries. I'm just getting errors back, like subquery returns more than one row and such. If someone could help me out with how to order it, and explain why it needs to be a certain way, that'd be great.

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  • Is there a way to determine if a <select> dropdown menu is open?

    - by Robert
    I'm looking for a way to determine if/when a <select> element's menu is open. I don't need to force it to open or close, just figure out if it's open or closed at a given time. I can listen to events for focus/blur, mouseup/mousedown, etc., but I don't think I can reliably figure out the state of the menu from those events. For example, mousedown followed by mouseup could mean the user clicked and dragged to a selection and released (in which case the menu is now closed) or clicked and released to open the menu (in which case the menu is open). It also seems likely that the specific behavior of dropdown menus is browser-dependent. I know I could do this if I roll my own dropdown menu, but I prefer to use <select>. Is there a reliable way to find out if a dropdown menu is open? Or is this something that Javascript can't know?

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  • How to stop an Android Service ONLY when there are no other activities in my app running?

    - by johnrock
    Is there a way I can test if there are any other activities in my app still alive? I am looking to stop a service in an onDestroy method, but only want to do this if there are no other activities from my app still alive on the stack. I have the call stop the service in the main activity's onDestroy() method. This works perfect EXCEPT that if a user launches my app, then launches a few activities in my app, then hits the home screen and RELAUNCHES my app, they will subvert my order and the main activity will now be above other activities of my app. From this state, if they hit the back button and 'back out' of my home screen they will trigger the onDestroy() method and kill the service even though there are other activities open on the stack. I want to avoid this by stopping the service ONLY if I am sure there are no other activities of mine open on the stack. Possible?

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  • How to make VB to execute my SQL SP with parameters?

    - by fema
    Hi, I have a database in MS SQL Server 2008, I have Stored Procedures. One of them does an INSERT with parameters. It works in Server Management Studio. Now I'd like to make a button in Visual Basic 2008 that executes this SP. I have made a DataSet, it contains my 3 SP's, I can easily use 2 of them, because they return data, but the one I'm having trouble with doesn't. Could anyone please tell me how to make VB to execute it? (The command should look like this: "EXECUTE SP2 a, b, c, d".) Thanks in advance

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