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• Is the heap actually a heap?

  - by ElectricDialect

  In .NET (and Java as far as I know), the area where objects are dynamically allocated is referred to as the managed heap. However, most documentation that describes how the managed heap works depicts it as a linear data structure, such as a linked list or stack. So, is the managed heap actually a heap, or is it implemented with some other data structure? If it actually does not use a heap data structure, is seems like a significant failure of terminology to overload the meaning of this word. If it is in fact a heap data structure, what is the value that satisfies the heap property: the size of the allocated memory region?

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• Is it safe to override `release` for debugging?

  - by Koning Baard XIV

  Sometimes I need to find out if an object will really be released. I could use Instruments of course, but that takes much time, and I have to search into millions of objects, so I used to do this: -(void)release { NSLog("I'm released"); [super release]; } But the problem is: is this safe to do? Can I get any problems when I override -(void)release. Also, is it really void? And what if I build my application for distribution, but per accident leave it there? Or is it just safe? Thanks

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• Best Persistence API for use with GWT

  - by KevMo

  What is the best persistence API for use with GWT? Sadly, the application will be hosted on my own java server, as I will need more control than GAE will give me. I know I will need to have two sets of my entities, one for the server side, and some pojo's for the client side. I'm looking to make the mapping of the data as simple as possible between the two, but these will be deeply nested objects so it has to be robust. I was looking at Dozer for my mapping needs. Previously I've used EJB3 with TopLink, so that's very familiar to me, but I would like to get community input on what other API's work well with Dozer and GWT.

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• Why does appending "" to a String save memory?

  - by hsmit

  I used a variable with a lot of data in it, say String data. I wanted to use a small part of this string in the following way: this.smallpart = data.substring(12,18); After some hours of debugging (with a memory visualizer) I found out that the objects field smallpart remembered all the data from data, although it only contained the substring. When I changed the code into: this.smallpart = data.substring(12,18)+""; ..the problem was solved! Now my application uses very little memory now! How is that possible? Can anyone explain this? I think this.smallpart kept referencing towards data, but why? UPDATE: How can I clear the big String then? Will data = new String(data.substring(0,100)) do the thing?

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• Adding scope variable to an constructor

  - by Lupus

  I'm trying to create a class like architecture on javascript but stuck on a point. Here is the code: var make = function(args) { var priv = args.priv, cons = args.cons, pub = args.pub; return function(consParams) { var priv = priv, cons = args.cons; cons.prototype.constructor = cons; cons.prototype = $.extend({}, pub); if (!$.isFunction(cons)) { throw new Hata(100001); } return new cons(consParams); } }; I'm trying to add the priv variable on the returned function objects's scope and object scope of the cons.prototype but I could not make it; Here is the usage of the make object: var myClass = make({ cons: function() { alert(this.acik); }, pub: { acik: 'acik' }, priv: { gizli: 'gizli' } }) myObj = myClass(); PS: Please forgive my english...

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• Geodjango: importing data from OSGB_1936, displaying in WGS84?

  - by AP257

  I have some polygon data saved in a PostGIS database with projection SRID 27700. geom = models.MultiPolygonField(srid=27700) I want to display the shapes on OpenStreetMap, i.e. with SRID 900913 (I think?). So, two questions: How do I change the code below to output with the right SRID for OpenStreetMap? How can I change the Django code below to give me a nice json object, ready to display as a polygon? area = get_object_or_404(soa.objects, code=my_code) polygon = area.geom return render_to_response('area.html', { 'area': area }, context_instance = RequestContext(request)) Apologies if this question doesn't make sense - I'm pretty new to GeoDjango.

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• Proper way to copy a readonly NSMutableArray

  - by Jon Hull

  I have an object with a readonly property that I am trying to implement NSCopying for. It has a mutableArray called "subConditions" (which holds "SubCondition" objects). I have made it readonly because I want callers to be able to change the data in the array, but not the array itself. This worked really well until it was time to write the -copyWithZone: method. After fumbling around a bit, I managed to get something that seems to work. I am not sure if it is the best practice though. Here is a simplified version of my -copyWithZone: method: -(id)copyWithZone:(NSZone*)zone { Condition *copy = [[[self class]allocWithZone:zone]init]; NSArray *copiedArray = [[NSArray alloc]initWithArray:self.subConditions copyItems:YES]; [copy.subConditions setArray:copiedArray]; [copiedArray release]; return copy; } Is this the correct/best way to copy a readonly mutableArray?

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• SQL Server: Can INFORMATION_SCHEMA Tell Me When a SQL Object Was Created?

  - by Jim G.

  Given: I added a non-nullable foreign key to a table. I settled on a way to populate the foreign key with default values. I checked in both changes to a re-runnable DB creation script. Other developers ran this script, and now they have the foreign key populated with default values on their developer machines. A few days later however... I changed my mind. Now I'd like to populate the foreign key's default values differently. My Question: Can SQL Server or INFORMATION_SCHEMA tell me when SQL objects were created? Ideally, I'd like to drop and re-add the foreign key if it was created before a certain date/time. Any help or alternative strategies would be greatly appreciated. Obviously, I'd like to avoid going to each developer's cube, asking them to drop the foreign key manually.

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• Can not clone git repo to server

  - by Classified

  I'm running the same command on 2 different servers. One works, the other doesn't. I'm running git clone https://blah.com:8443/blah.git On server A, it works fine. I get the objects, files, etc. no problems. On server B, I get the following message. git clone https://blah.com:8443/blah.git Cloning into 'blah'... error: Peer certificate cannot be authenticated with known CA certificates while accessing https://blah.com:8443/blah.git/info/refs?service=git-upload-pack fatal: HTTP request failed Does anyone know what this means or what I need to do to get this to work? Thanks in advance for any help you can give me.

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• Custom Silverlight button with <Path> content and visual states

  - by Klay

  I would like to create a button control that has a Path element as its content--an IconButton if you will. This button should fulfill two conditions: 1. The Path element's stroke and fill colors should be available for manipulation by the VisualStateManager. 2. The Path element's data string (which defines it's shape) can be set in code or in XAML, so that I can create several such buttons without creating a new custom control for each. The only way I can see to do it would involve no XAML whatsoever. That is, setting all the visual states and animations in the code behind, plus generating the Geometry objects point by point (and not being able to use the convenient Data string property on the Path element). Is there a simpler way to do this?

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• Kendo UI, searchable Combobox

  - by user2083524

  I am using the free Kendo UI Core Framework. I am looking for a searchable Combobox that fires the sql after inserting, for example, 2 letters. Behind my Listbox there are more than 10000 items and now it takes too much time when I load or refresh the page. Is it possible to trigger the sql query only by user input like the autocomplete widget do? My code is: <link href="test/styles/kendo.common.min.css" rel="stylesheet" /> <link href="test/styles/kendo.default.min.css" rel="stylesheet" /> <script src="test/js/jquery.min.js"></script> <script src="test/js/kendo.ui.core.min.js"></script> <script> $(document).ready(function() { var objekte = $("#objekte").kendoComboBox({ placeholder: "Objekt auswählen", dataTextField: "kurzname", dataValueField: "objekt_id", minLength: 2, delay: 0, dataSource: new kendo.data.DataSource({ transport: { read: "test/objects.php" }, schema: { data: "data" } }), }).data("kendoComboBox"); </script>

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• It is possible to call a servlet from a Java class?

  - by Renan Mozone

  I'm using IBM WebSphere as my servlet container. My application has several servlets and Java classes. My intent is to call one of those servlets directly from a Java class. Doing some research I figured out that is possible to use the RequestDispatcher interface to achieve this. But it is necessary to pass the objects ServletRequest and ServletResponse as arguments to the method forward(). There is some way to bypass this safely and "nicely"? By "nicely" I meant to say preserving good programming and design patterns.

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• Embedding QT application in Eclipse/RCP framework

  - by mots_g

  Hi, I'm trying to embed my working QT application in Eclipse RCP framework(might not sound wise but i need to do this). I'm using QT 4.5 (not yet explored what QTJambi is all about and has to offer) I convert my existing application as a dll and load it through eclipse application. Things dont work as they should as the QTApplication loop sits listening for events, and there is a good mismatch of events. Certain UI objects dont get the events. If I comment my Qppliaction::exec(), then the behaviour in QT app changes. Is there a way to achieve what I'm trying to achieve?? Thanks

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• Does JSON.js cause conflicts with Sys.Serialization.JavaScriptSerializer.serialize

  - by David Robbins

  I am using Telerik controls in my webforms and want to serialize object on the client. Since I am getting a stackoverflow error with Sys.Serialization.JavaScriptSerializer.deserialize I wanted to try JSON. With both JSON and and the MS library I get "Sys.Application is undefined." Has anyone encountered this what did you do as a work around? EDIT I am serializing my object on a parent page and passing them via an argument to a child window. The child window is in an IFRAME tag. The object can be used in the child page, but I receive the stackoverflow error when I serialize it. The object is an Array of objects.

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• Strategy Design Pattern -- *dynamic* !!!

  - by alexeypro

  My application will have different strategies for my objects. What's the best way of implementing that? I would really love the case when we can make strategy classes implementation dynamically loaded from, say, some relational database. Not sure how do that better, though. What's the best approach? Idea is that say we want to apply to object MyObj strategy Strategy123 then we just load from database by ID 123 the object, deserialize it, get the Strategy class, and use it with MyObj. The maintenance while sounds easier from the first look can be a pain in the long run if Strategy interfaces changes, etc. What can I do also? I want to find solution when I should be keeping Strategy classes in codebase -- just for the sake that I don't need code change and re-deployment of the application if my Strategy changes, or I add new strategy. Please advise!

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• Retrieve input and output parameters for SQL stored procs and functions?

  - by Darth Continent

  For a given SQL stored proc or function, I'm trying to obtain its input and output parameters, where applicable, in a Winforms app I'm creating to browse objects and display their parameters and other attributes. So far I've discovered the SQL system function object_definition, which takes a given sysobjects.id and returns the text of that object; also discovered via search this post which describes extracting the parameters in the context of a app using the ADO.NET method DeriveParameters in conjunction with some caching for better performance; and for good measure found some helpful system stored procs from this earlier post on Hidden Features of SQL Server. I'm leaning towards implementing the DeriveParameters method in my C# app, since parsing the output of object_definition seems messy, and I haven't found a hidden feature in that post so far that would do the trick. Is DeriveParameters applicable to both functions and stored procs for purposes of retreiving their parameters, and if so, could someone please provide an example?

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• Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more i

  - by pooyakhamooshi

  I have developed an application using Entity Framework, SQL Server 2000, VS 2008 and Enterprise Library. It works absolutely fine locally but when I deploy the project to our test environment, I am getting the following error: "Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information." Stack trace: at System.Reflection.Module._GetTypesInternal(StackCrawlMark& stackMark) at System.Reflection.Assembly.GetTypes() at System.Data.Metadata.Edm.ObjectItemCollection.AssemblyCacheEntry.LoadTypesFromAssembly(LoadingContext context) at System.Data.Metadata.Edm.ObjectItemCollection.AssemblyCacheEntry.InternalLoadAssemblyFromCache(LoadingContext context) at System.Data.Metadata.Edm.ObjectItemCollection.AssemblyCacheEntry.LoadAssemblyFromCache(Assembly assembly, Boolean loadReferencedAssemblies, Dictionary2 knownAssemblies, Dictionary2& typesInLoading, List`1& errors) at System.Data.Metadata.Edm.ObjectItemCollection.LoadAssemblyFromCache(ObjectItemCollection objectItemCollection, Assembly assembly, Boolean loadReferencedAssemblies) at System.Data.Metadata.Edm.ObjectItemCollection.LoadAssemblyForType(Type type) at System.Data.Metadata.Edm.MetadataWorkspace.LoadAssemblyForType(Type type, Assembly callingAssembly) at System.Data.Objects.ObjectContext.CreateQueryT Entity Framework seems to have issue, any clue how to fix it?

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• What is the correct way to backup ZODB blobs?

  - by joeforker

  I am using plone.app.blob to store large ZODB objects in a blobstorage directory. This reduces size pressure on Data.fs but I have not been able to find any advice on backing up this data. I am already backing up Data.fs by pointing a network backup tool at a directory of repozo backups. Should I simply point that tool at the blobstorage directory to backup my blobs? What if the database is being repacked or blobs are being added and deleted while the copy is taking place? Are there files in the blobstorage directory that must be copied over in a certain order?

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• Stack memory in Android

  - by Matt

  I'm writing an app that has a foreground service, content provider, and a Activity front end that binds to the service and gets back a List of objects using AIDL. The service does work and updates a database. If I leave the activity open for 4-8+ hours, and go to the "Running Services" section under settings on the phone (Nexus One) an unusually large amount of memory being used is shown (~42MB). I figure there is a leak. When I check the heap memory i get Heap size:~18MB, ~2MB allocated, ~16MB free. Analyzing the hprof in Eclipse MAT seems fine, which leads me to theorize that memory is leaking on the stack. Is this even possible? If it is, what can I do to stop or investigate the leak? Is the reported memory usage on the "Running Services" section of android even correct (I assume it is)? Another note: I have been unable to reproduce this issue when the UI is not up (with only the service running)

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• Memory leak in Qt signal and slots

  - by Ajay

  Hello, I am running valgrind on my Qt code,and even on successful exit of the application, get the following report from valgrind 8,832 bytes in 92 blocks are still reachable in loss record 12 of 12 at 0x4025390: operator new(unsigned int) (vg_replace_malloc.c:214) ==3339== by 0x4B75F05: QMutex::QMutex(QMutex::RecursionMode) (qmutex.cpp:123) ==3339== by 0x4B77602: QMutexPool::get(void const*) (qmutexpool.cpp:137) ==3339== by 0x4CA0EC2: signalSlotLock(QObject const*) (qobject.cpp:112) ==3339== by 0x4CA3939: QMetaObjectPrivate::connect(QObject const*, int, QObject const*, int, int, int*) (qobject.cpp:2900) ==3339== by 0x4CA5C00: QObject::connect(QObject const*, char const*, QObject const*, char const*, Qt::ConnectionType) (qobject.cpp:2599) I disconnect all signal connections and also delete the objects. The above mentioned leak increases if i increase the amount of signal and slot connections? Can anybody help with this?

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• Reasons why one should not call the garbage collector directly.

  - by Shimrod

  Hi everyone, I'm currently writing a paper for my company, about how to avoid calling the garbage collector directly from the code (when playing with COM objects for instance). I know this is a bad practice, and should be only considered in very rare cases, but I can't seem to find a way to tell why it should be avoided. And I don't want to rely on the "The G.C. is smarter than you" principle (even if it is the truth :-) ) So can you tell me some clues about why you think one should avoid to call the garbage collector directly ? (performance impact?) Or maybe if you have links about this particular topic, they would be very helpful. Thanks in advance !

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• Virtual Mice in C#

  - by jameshong

  Hi guys, Is there anything that we could do for implementing VIRTUAL MICE? I mean, I want to have multiple mice within the whole OS, but they must be all VIRTUAL (I'm not talking about the applications that serve multiple mice driver for PS/2 or USB mice or Microsoft's MultiPoint Mouse SDK.) It is like creating two objects: Mouse mouse1, mouse2; and using them like: mouse1.mouse_event(...); mouse2.mouse_event(...); having a CURSOR on the screen is NOT IMPORTANT. I only need the action (MOUSE DOWN, MOVE, UP for each but separated) and the important thing is that these VIRTUAL MICE should work together, at the same time, click or down-move action with different coordinates(x,y).

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• Javascript Array Scope - newbie here

  - by Gianluca

  So, I am learning Javascript while playing white Google Calendar APIs and I just can't figure how this piece of code is working this way: var entriesResult = []; var data = new Date(2010,3,22,17,0,0); var callback = function(result) { var entries = result.feed.getEntries(); if (entries.length != 0) { entriesResult = eventsManager(entries, 0, data); window.alert("inner entriesResult " + entriesResult.length); } } this.service.getEventsFeed(this.query, callback, handleGDError); window.alert("outer entriesResult " + entriesResult.length); eventsManager() is a function that returns an array of Objects. getEventsFeed() it's an API function: it queries the service and pass a "feed root" (a feed with selected items) to the callback function. Why the first alert (inner..) outputs a valid entriesResult.length while the second one (outer..) always outputs a 0? I tought javascript arrays are always passed by reference, what's wrong whit my code? Thank you :)

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• accepts_nested_attributes_for ignore blank values

  - by Mike

  i have class Profile has_many :favorite_books, :dependent => :destroy has_many :favorite_quotes, :dependent => :destroy accepts_nested_attributes_for :favorite_books, :allow_destroy => true accepts_nested_attributes_for :favorite_quotes, :allow_destroy => true end I have a dynamic form where you press '+' to add new textareas for creating new favorites. What i want to do is ignore the blank ones, I find this harder to sort through in the update controller than a non nested attribute. What i have temporarily is a hack in the after_save callback deleting the empty records. Whats the most rails way to ignore these blank objects? I dont want validation and errors, just a silent deletion/ignore.

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• Getting weird python error when I run a simple django script in Eclipse, not happening in console

  - by Rhubarb

  I am running a basic script that sets up the django environment by itself, to enable me to test the ORM features of django without having to implement web pages. The script then imports one of the types defined in my models. This error doesn't happen when I run this script from iPython, only from eclipse. Simply doing this import causes a weird exception like the following: Exception AttributeError: "'NoneType' object has no attribute 'print_exc'" in <bound method Signal._remove_receiver of <django.dispatch.dispatcher.Signal object at 0x026802B0>> ignored My script is as follows: from django.core.management import setup_environ import settings setup_environ(settings) from stats.models import Person for p in Person.objects.all(): print p.Name

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