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• WPF Binding Collection To ComboBox and Selecting an item

  - by Adam Driscoll

  I've been knocking my head against this for some time now. I'm not really sure why it isn't working. I'm still pretty new to this whole WPF business. Here's my XAML for the combobox <ComboBox Width="200" SelectedValuePath="Type.FullName" SelectedItem="{Binding Path=Type}" Name="cmoBox" > </ComboBox> Here's what populates the ComboBox (myAssembly is a class I created with a list of possible types) cmoBox.ItemsSource = myAssembly.PossibleTypes; I set the DataContext in a parent element of the ComboBox in the code behind like this: groupBox.DataContext = listBox.SelectedItem; I want the binding to select the correct "possible type" from the combo box. It doesn't select anything. I have tried SelectedValue and SelectedItem. When I changed the DisplayMemberPath of the ComboBox to a different property it changed what was displayed so I know it's not completely broken. Any ideas???

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• .Net Finalizer Order / Semantics in Esent and Ravendb

  - by mattcodes

  Help me understand. I've read that "The time and order of execution of finalizers cannot be predicted or pre-determined" Correct? However looking at RavenDB source code TransactionStorage.cs I see this ~TransactionalStorage() { try { Trace.WriteLine( "Disposing esent resources from finalizer! You should call TransactionalStorage.Dispose() instead!"); Api.JetTerm2(instance, TermGrbit.Abrupt); } catch (Exception exception) { try { Trace.WriteLine("Failed to dispose esent instance from finalizer because: " + exception); } catch { } } } The API class (which belongs to Managed Esent) which presumable takes handles on native resources presumably using a SafeHandle? So if I understand correctly the native handles SafeHandle can be finalized before TransactionStorage which could have undesired effects, perhaps why Ayende has added an catch all clause around this? Actually diving into Esent code, it does not use SafeHandles. According to CLR via C# this is dangerous? internal static class SomeType { [DllImport("Kernel32", CharSet=CharSet.Unicode, EntryPoint="CreateEvent")] // This prototype is not robust private static extern IntPtr CreateEventBad( IntPtr pSecurityAttributes, Boolean manualReset, Boolean initialState, String name); // This prototype is robust [DllImport("Kernel32", CharSet=CharSet.Unicode, EntryPoint="CreateEvent")] private static extern SafeWaitHandle CreateEventGood( IntPtr pSecurityAttributes, Boolean manualReset, Boolean initialState, String name) public static void SomeMethod() { IntPtr handle = CreateEventBad(IntPtr.Zero, false, false, null); SafeWaitHandle swh = CreateEventGood(IntPtr.Zero, false, false, null); } } Managed Esent (NativeMEthods.cs) looks like this (using Ints vs IntPtrs?): [DllImport(EsentDll, CharSet = EsentCharSet, ExactSpelling = true)] public static extern int JetCreateDatabase(IntPtr sesid, string szFilename, string szConnect, out uint dbid, uint grbit); Is Managed Esent handling finalization/dispoal the correct way, and second is RavenDB handling finalizer the corret way or compensating for Managed Esent?

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• versioning fails for onetomany collection holder

  - by Alexander Vasiljev

  given parent entity @Entity public class Expenditure implements Serializable { ... @OneToMany(mappedBy = "expenditure", cascade = CascadeType.ALL, orphanRemoval = true) @OrderBy() private List<ExpenditurePeriod> periods = new ArrayList<ExpenditurePeriod>(); @Version private Integer version = 0; ... } and child one @Entity public class ExpenditurePeriod implements Serializable { ... @ManyToOne @JoinColumn(name="expenditure_id", nullable = false) private Expenditure expenditure; ... } While updating both parent and child in one transaction, org.hibernate.StaleObjectStateException is thrown: Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect): Indeed, hibernate issues two sql updates: one changing parent properties and another changing child properties. Do you know a way to get rid of parent update changing child? The update results both in inefficiency and false positive for optimistic lock. Note, that both child and parent save their state in DB correctly. Hibernate version is 3.5.1-Final

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• Unexpected performance curve from CPython merge sort

  - by vkazanov

  I have implemented a naive merge sorting algorithm in Python. Algorithm and test code is below: import time import random import matplotlib.pyplot as plt import math from collections import deque def sort(unsorted): if len(unsorted) <= 1: return unsorted to_merge = deque(deque([elem]) for elem in unsorted) while len(to_merge) > 1: left = to_merge.popleft() right = to_merge.popleft() to_merge.append(merge(left, right)) return to_merge.pop() def merge(left, right): result = deque() while left or right: if left and right: elem = left.popleft() if left[0] > right[0] else right.popleft() elif not left and right: elem = right.popleft() elif not right and left: elem = left.popleft() result.append(elem) return result LOOP_COUNT = 100 START_N = 1 END_N = 1000 def test(fun, test_data): start = time.clock() for _ in xrange(LOOP_COUNT): fun(test_data) return time.clock() - start def run_test(): timings, elem_nums = [], [] test_data = random.sample(xrange(100000), END_N) for i in xrange(START_N, END_N): loop_test_data = test_data[:i] elapsed = test(sort, loop_test_data) timings.append(elapsed) elem_nums.append(len(loop_test_data)) print "%f s --- %d elems" % (elapsed, len(loop_test_data)) plt.plot(elem_nums, timings) plt.show() run_test() As much as I can see everything is OK and I should get a nice N*logN curve as a result. But the picture differs a bit: Things I've tried to investigate the issue: PyPy. The curve is ok. Disabled the GC using the gc module. Wrong guess. Debug output showed that it doesn't even run until the end of the test. Memory profiling using meliae - nothing special or suspicious. ` I had another implementation (a recursive one using the same merge function), it acts the similar way. The more full test cycles I create - the more "jumps" there are in the curve. So how can this behaviour be explained and - hopefully - fixed? UPD: changed lists to collections.deque UPD2: added the full test code UPD3: I use Python 2.7.1 on a Ubuntu 11.04 OS, using a quad-core 2Hz notebook. I tried to turn of most of all other processes: the number of spikes went down but at least one of them was still there.

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• GC output clarification

  - by elec

  I'm running a java application with the following settings: -XX:+CMSParallelRemarkEnabled -XX:+UseConcMarkSweepGC -XX:+UseParNewGC -XX:+PrintGCApplicationStoppedTime -XX:+PrintGCApplicationConcurrentTime -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintGCDateStamps -XX:+PrintHeapAtGC -XX:+PrintTenuringDistribution I'm not sure how to interpret the related gc logs(below). In particular: Heap after GC invocations=31 (full 3): does this mean there were 31 minor GCs, and 3 full GCs ? What triggers the several consecutive lines of Total time for which the application threads were stopped and Application Time ? Is it possible to get the time stamps associated with each of these lines ? GC logs: Total time for which application threads were stopped: 0.0046910 seconds Application time: 0.7946670 seconds Total time for which application threads were stopped: 0.0002900 seconds Application time: 1.0153640 seconds Total time for which application threads were stopped: 0.0002780 seconds Application time: 1.0161890 seconds Total time for which application threads were stopped: 0.0002760 seconds Application time: 1.0145990 seconds Total time for which application threads were stopped: 0.0002950 seconds Application time: 0.9999800 seconds Total time for which application threads were stopped: 0.0002770 seconds Application time: 1.0151640 seconds Total time for which application threads were stopped: 0.0002730 seconds Application time: 0.9996590 seconds Total time for which application threads were stopped: 0.0002880 seconds Application time: 0.9624290 seconds {Heap before GC invocations=30 (full 3): par new generation total 131008K, used 130944K [0x00000000eac00000, 0x00000000f2c00000, 0x00000000f2c00000) eden space 130944K, 100% used [0x00000000eac00000, 0x00000000f2be0000, 0x00000000f2be0000) from space 64K, 0% used [0x00000000f2bf0000, 0x00000000f2bf0000, 0x00000000f2c00000) to space 64K, 0% used [0x00000000f2be0000, 0x00000000f2be0000, 0x00000000f2bf0000) concurrent mark-sweep generation total 131072K, used 48348K [0x00000000f2c00000, 0x00000000fac00000, 0x00000000fac00000) concurrent-mark-sweep perm gen total 30000K, used 19518K [0x00000000fac00000, 0x00000000fc94c000, 0x0000000100000000) 2010-05-11T09:30:13.888+0100: 384.955: [GC 384.955: [ParNew Desired survivor size 32768 bytes, new threshold 0 (max 0) : 130944K-0K(131008K), 0.0052470 secs] 179292K-48549K(262080K), 0.0053030 secs] [Times: user=0.00 sys=0.00, real=0.01 secs] Heap after GC invocations=31 (full 3): par new generation total 131008K, used 0K [0x00000000eac00000, 0x00000000f2c00000, 0x00000000f2c00000) eden space 130944K, 0% used [0x00000000eac00000, 0x00000000eac00000, 0x00000000f2be0000) from space 64K, 0% used [0x00000000f2be0000, 0x00000000f2be0000, 0x00000000f2bf0000) to space 64K, 0% used [0x00000000f2bf0000, 0x00000000f2bf0000, 0x00000000f2c00000) concurrent mark-sweep generation total 131072K, used 48549K [0x00000000f2c00000, 0x00000000fac00000, 0x00000000fac00000) concurrent-mark-sweep perm gen total 30000K, used 19518K [0x00000000fac00000, 0x00000000fc94c000, 0x0000000100000000) } Total time for which application threads were stopped: 0.0056410 seconds Application time: 0.0475220 seconds Total time for which application threads were stopped: 0.0001800 seconds Application time: 1.0174830 seconds Total time for which application threads were stopped: 0.0003820 seconds Application time: 1.0126350 seconds Total time for which application threads were stopped: 0.0002750 seconds Application time: 1.0155910 seconds Total time for which application threads were stopped: 0.0002680 seconds Application time: 1.0155580 seconds Total time for which application threads were stopped: 0.0002880 seconds Application time: 1.0155480 seconds Total time for which application threads were stopped: 0.0002970 seconds Application time: 0.9896810 seconds

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• Garbage collecting at ColdFusion CFC

  - by Sergii

  Hello. I have a CFC as singletone object in Application scope. One of the methods is used for massive data processing and periodically causes the "Java heap space" errors. EDIT All variables inside the method are VAR-scoped, so they should not be kept in the object scope when invokation ended. It can be a bit dumb question for Java people, but I'd like to know how Java garbage collector cleans up the CFC methods memory: only when whole request ends, or maybe right after each method/function invokation? Second option is interesting because it can allow me to split my large method into the few, as one of the possible optimizations.

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• Datagridview Winforms Add or Delete Rows in Edit Mode with Collection Binding

  - by user630548

  In my datagridview, I bind a List of objects named 'ProductLine'. But unfortunately with this approach I cannot 'Add' or 'Delete' rows to the datagridview in edit mode. When I create a fresh new order I can Add or Delete rows but once I save it and try to open it in Edit then it doesn't let me 'Add' or 'Delete' (via keyboard). Any idea? Here is the code for this: If it is a fresh Order then I do something like this: private void Save(){ for (int i = 0; i <= dtgProdSer.RowCount - 1; i++) { if ((itemList != null) && (itemList.Count > i)) productLine = itemList[i]; else productLine = new ProductLine(); productLine.Amount = Convert.ToDouble(dataGridViewTextBoxCell.Value); } } And if it is an Edit then in the Form_Load I check ProductId is NON Zero then I do the following: private void fillScreen{ dtgProdSer.DataSource = itemList; } But with this I cannot Add or Delete Rows in Edit mode. Any advise is greatly appreciated.

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• Creating foreach loops using Code Igniter controller and view

  - by Tim

  Hello, This is a situation I have found myself in a few times and I just want clear it up once and for all. Best just to show you what I need to do in some example code. My Controller function my_controller() { $id = $this->uri->segment(3); $this->db->from('cue_sheets'); $this->db->where('id', $id); $data['get_cue_sheets'] = $this->db->get(); $this->db->from('clips'); $this->db->where('sheet_id', ' CUE SHEET ID GOES IN HERE ??? '); $data['get_clips'] = $this->db->get(); $this->load->view('show_sheets_and_clips', $data); } My View <?php if($get_cue_sheets->result_array()) { ?> <?php foreach($get_cue_sheets->result_array() as $sheetRow): ?> <h1><?php echo $sheetRow['sheet_name']; ?></h1> <br/> <?php if($get_clips->result_array()) { ?> <ul> <?php foreach($get_clips->result_array() as $clipRow): ?> <li><?php echo $clipRow['clip_name']; ?></li> <?php endforeach; ?> </ul> <?php } else { echo 'No Clips Found'; } ?> <?php endforeach; ?> <?php } ?> The problem I am having is the concept of passing data back to the controller from the view as I am sending the Database Queries off to the view as an array, when I really need to get some more information as to which sheet ID I am looking for to show the relevant clips. I hope this makes sense to someone out there. Thanks, Tim

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• Adding a custom subview (created in a xib) to a view controller's view - What am I doing wrong

  - by Fran

  I've created a view in a xib (with an activity indicator, a progress view and a label). Then I've created .h/.m files: #import <UIKit/UIKit.h> @interface MyCustomView : UIView { IBOutlet UIActivityIndicatorView *actIndicator; IBOutlet UIProgressView *progressBar; IBOutlet UILabel *statusMsg; } @end #import "MyCustomView.h" @implementation MyCustomView - (id)initWithFrame:(CGRect)frame { if ((self = [super initWithFrame:frame])) { // Initialization code } return self; } - (void)dealloc { [super dealloc]; } @end In IB, I set the file's owner and view identity to MyCustomView and connect the IBOutlet to the File's owner In MyViewController.m, I've: - (void)viewDidLoad { [super viewDidLoad]; UIView *subView = [[MyCustomView alloc] initWithFrame:myTableView.frame]; [subView setBackgroundColor:[UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.5]]; [myTableView addSubview:subView]; [subView release]; } When I run the app, the view is added, but I can't see the label, the progress bar and the activity indicator. What am I doing wrong?

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• Multiple levels of 'collection.defaultdict' in Python

  - by Morlock

  Thanks to some great folks on SO, I discovered the possibilities offered by collections.defaultdict, notably in readability and speed. I have put them to use with success. Now I would like to implement three levels of dictionaries, the two top ones being defaultdict and the lowest one being int. I don't find the appropriate way to do this. Here is my attempt: from collections import defaultdict d = defaultdict(defaultdict) a = [("key1", {"a1":22, "a2":33}), ("key2", {"a1":32, "a2":55}), ("key3", {"a1":43, "a2":44})] for i in a: d[i[0]] = i[1] Now this works, but the following, which is the desired behavior, doesn't: d["key4"]["a1"] + 1 I suspect that I should have declared somewhere that the second level defaultdict is of type int, but I didn't find where or how to do so. The reason I am using defaultdict in the first place is to avoid having to initialize the dictionary for each new key. Any more elegant suggestion? Thanks pythoneers!

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• Uncaught TypeError: Object [object Object] has no method 'onAdded'

  - by user3604227

  I am using ExtJS4 with Java servlets. I am following the MVC architecture for ExtJS. I am trying a simple example of displaying a border layout but it doesnt work and I get the following error in ext-all.js in the javascript console: Uncaught TypeError: Object [object Object] has no method 'onAdded' Here is my code: app.js Ext.Loader.setConfig({ enabled : true }); Ext.application({ name : 'IN', appFolder : 'app', controllers : [ 'Items' ], launch : function() { console.log('in LAUNCH-appjs'); Ext.create('Ext.container.Viewport', { items : [ { xtype : 'borderlyt' } ] }); } }); Items.js (controller) Ext.define('IN.controller.Items', { extend : 'Ext.app.Controller', views : [ 'item.Border' ], init : function() { this.control({ 'viewport > panel' : { render : this.onPanelRendered } }); }, onPanelRendered : function() { console.log('The panel was rendered'); } }); Border.js (view) Ext.define('IN.view.item.Border',{extend : 'Ext.layout.container.Border', alias : 'widget.borderlyt', title : 'Border layout' , autoShow : true, renderTo : Ext.getBody(), defaults : { split : true, layout : 'border', autoScroll : true, height : 800, width : 500 }, items : [ { region : 'north', html : "Header here..", id : 'mainHeader' }, { region : 'west', width : 140, html : "Its West..", }, { region : 'south', html : "This is my temp footer content", height : 30, margins : '0 5 5 5', bodyPadding : 2, id : 'mainFooter' }, { id : 'mainContent', collapsible : false, region : 'center', margins : '5', border : true, } ] }); The folder structure for the Webcontent is as follows: WebContent app controller Items.js model store view item Border.js ext_js resources src ext_all.js index.html app.js Can someone help me resolve this error? Thanks in advance

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• OnContextMenu() not working in view class

  - by Anu

  Hi, i have a popup menu for contextmenu.And i wrote the function for each menu in CMainframe. I have OnContextMenu() in each view class and in one dialog class.Its works fine in Dialog class.But not in View class.Codings are below: CMainframe funciton: void CMainFrame::OnUpdateFptrend(CCmdUI* pCmdUI) { ((CMainFrame *)AfxGetMainWnd())->SendMessage(WM_COMMAND,ID_TRENDVIEW,NULL); } void CMainFrame::OnUpdateFptuning(CCmdUI* pCmdUI) { ((CMainFrame *)AfxGetMainWnd())->SendMessageWM_COMMAND,ID_TUNINGVIEW,NULL); } Dialog class Contextmenu: void CFacePlate::OnContextMenu(CWnd* pWnd, CPoint point) { CMenu mnuPopup; mnuPopup.LoadMenu(IDR_FPMENU); CRect rBarRect; rBarRect.left = rBarRect.top = 0; rBarRect.right = 1000;rBarRect.bottom = 300; CMenu *mnuPopupMenu = mnuPopup.GetSubMenu(0); ASSERT(mnuPopupMenu); if( rBarRect.PtInRect(point) ) mnuPopupMenu->TrackPopupMenu(TPM_LEFTALIGN | TPM_RIGHTBUTTON, point.x, point.y, this); } View class: void CGroupView::OnContextMenu(CWnd* pWnd, CPoint point) { CMenu mnuPopup; mnuPopup.LoadMenu(IDR_FPMENU); CRect rBarRect; rBarRect.left = rBarRect.top = 0; rBarRect.right = 1150;rBarRect.bottom = 390; CMenu *mnuPopupMenu = mnuPopup.GetSubMenu(0); ASSERT(mnuPopupMenu); if( rBarRect.PtInRect(point) ) mnuPopupMenu->TrackPopupMenu(TPM_LEFTALIGN | TPM_RIGHTBUTTON, point.x, point.y, this); } When i press popup menu from Faceplate(Dialogclass),it goes to Mainframe function.At the same time when i press menu from any view class,it doesnot go to Mainframe function.Why its like that?

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• Updating Model with entity collection

  - by jean27

  There are a group of entities named Book and Magazine which inherits from the abstract class PublishedItem. PublishedItem have these properties: ID, Name, Publisher, List of Authors, List of Genres. The Book entity has the ISBN property and the Magazine entity has the ISSN property. I just want to ask how I can update the book's or magazine's list of genres or list of authors?

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• JDO difficulties in retrieving persistent vector

  - by Michael Omer

  I know there are already some posts regarding this subject, but although I tried using them as a reference, I am still stuck. I have a persistent class as follows: @PersistenceCapable(identityType = IdentityType.APPLICATION) public class GameObject implements IMySerializable{ @PrimaryKey @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY) protected Key m_databaseKey; @NotPersistent private final static int END_GAME_VAR = -1000; @Persistent(defaultFetchGroup = "true") protected GameObjectSet m_set; @Persistent protected int m_databaseType = IDatabaseAccess.TYPE_NONE; where GameObjectSet is: @PersistenceCapable(identityType = IdentityType.APPLICATION) @FetchGroup(name = "mySet", members = {@Persistent(name = "m_set")}) public class GameObjectSet { @PrimaryKey @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY) private Key id; @Persistent private Vector<GameObjectSetPair> m_set; and GameObjectSetPair is: @PersistenceCapable(identityType = IdentityType.APPLICATION) public class GameObjectSetPair { @PrimaryKey @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY) private Key id; @Persistent private String key; @Persistent(defaultFetchGroup = "true") private GameObjectVar value; When I try to fetch the entire structure by fetching the GameObject, the set doesn't have any elements (they are all null) I tried adding the fetching group to the PM, but to no avail. This is my fetching code Vector<GameObject> ret = new Vector<GameObject>(); PersistenceManager pm = PMF.get().getPersistenceManager(); pm.getFetchPlan().setMaxFetchDepth(-1); pm.getFetchPlan().addGroup("mySet"); Query myQuery = pm.newQuery(GameObject.class); myQuery.setFilter("m_databaseType == objectType"); myQuery.declareParameters("int objectType"); try { List<GameObject> res = (List<GameObject>)myQuery.execute(objectType); ret = new Vector<GameObject>(res); for (int i = 0; i < ret.size(); i++) { ret.elementAt(i).getSet(); ret.elementAt(i).getSet().touchSet(); } } catch (Exception e) { } finally { pm.close(); } Does anyone have any idea? Thanks Mike

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• How do I reliably get the size of my iPhone view taking rotations into consideration?

  - by Sebastian Celis

  My application uses a UITabBarController, multiple UINavigationControllers, and supports autorotation. In order to properly layout the subviews within each UIViewController's main view, I really need to know the size available to the UIViewContoller. I need this size to take the UINavigationBar, the UITabBar, and the status bar all into account, and thus only return the size available to the content view. I thought for sure I could use the following from within the UIViewController's code: CGRect viewControllerBounds = [[self view] bounds]; However, there are a couple of issues with this approach: The first time the view is loaded, viewControllerBounds reports the view as being 320 pixels wide by 460 pixels tall. This is wrong. With a status bar and a navigation bar showing, the height should only be 416 pixels. However, if I rotate the simulator to landscape and then rotate back, the height of viewControllerBounds changes to 416. If I rotate the first view in the navigation controller to landscape mode and then push another view controller onto the stack, viewControllerBounds for the new view reports a width of 300 pixels and a height of 480 pixels. So the view's bounds didn't even take the rotation into account. Is there a better way to do this? I really don't want to have to start hardcoding the widths and heights of all the various UI elements the iPhone OS provides. I have tried setting the autoresizing mask of the UIViewController's view, but that doesn't seem to change anything. The views definitely seem to be displaying properly. When I set a background color that view looks like it takes up all of the space available to it. Any pointers would be greatly appreciated.

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• Do fluent interfaces significantly impact runtime performance of a .NET application?

  - by stakx

  I'm currently occupying myself with implementing a fluent interface for an existing technology, which would allow code similar to the following snippet: using (var directory = Open.Directory(@"path\to\some\directory")) { using (var file = Open.File("foobar.html").In(directory)) { // ... } } In order to implement such constructs, classes are needed that accumulate arguments and pass them on to other objects. For example, to implement the Open.File(...).In(...) construct, you would need two classes: // handles 'Open.XXX': public static class OpenPhrase { // handles 'Open.File(XXX)': public static OpenFilePhrase File(string filename) { return new OpenFilePhrase(filename); } // handles 'Open.Directory(XXX)': public static DirectoryObject Directory(string path) { // ... } } // handles 'Open.File(XXX).XXX': public class OpenFilePhrase { internal OpenFilePhrase(string filename) { _filename = filename } // handles 'Open.File(XXX).In(XXX): public FileObject In(DirectoryObject directory) { // ... } private readonly string _filename; } That is, the more constituent parts statements such as the initial examples have, the more objects need to be created for passing on arguments to subsequent objects in the chain until the actual statement can finally execute. Question: I am interested in some opinions: Does a fluent interface which is implemented using the above technique significantly impact the runtime performance of an application that uses it? With runtime performance, I refer to both speed and memory usage aspects. Bear in mind that a potentially large number of temporary, argument-saving objects would have to be created for only very brief timespans, which I assume may put a certain pressure on the garbage collector. If you think there is significant performance impact, do you know of a better way to implement fluent interfaces?

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• JavaScript Collection of one-line Useful Functions

  - by Wilq32

  This is a question to put as many interesting and useful JavaScript functions written in one line as we can. I made this question because I'm curious how many people around like the art of one-Line programming in JavaScript, and I want to see their progress in action. Put variations of each code inside comments.

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• Limiting the size of the managed heap in a C# application

  - by Assaf Lavie

  Can I configure my C# application to limit its memory consumption to, say, 200MB? IOW, I don't want to wait for the automatic GC (which seems to allow the heap to grow much more than actually needed by this application). I know that in Java there's a command line switch you can pass to the JVM that achieves this.. is there an equivalent in C#? p.s. I know that I can invoke the GC from code, but that's something I would rather not have to do periodically. I'd rather set it once upon startup somehow and forget it.

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• How to order a HasMany collection by a child property with Fluent NHibernate mapping

  - by Geoff Hardy

  I am using Fluent NHibernate to map the following classes: public abstract class DomainObject { public virtual int Id { get; protected internal set; } } public class Attribute { public virtual string Name { get; set; } } public class AttributeRule { public virtual Attribute Attribute { get; set; } public virtual Station Station { get; set; } public virtual RuleTypeId RuleTypeId { get; set; } } public class Station : DomainObject { public virtual IList<AttributeRule> AttributeRules { get; set; } public Station() { AttributeRules = new List<AttributeRule>(); } } My Fluent NHibernate mappings look like this: public class AttributeMap : ClassMap<Attribute> { public AttributeMap() { Id(o => o.Id); Map(o => o.Name); } } public class AttributeRuleMap : ClassMap<AttributeRule> { public AttributeRuleMap() { Id(o => o.Id); Map(o => o.RuleTypeId); References(o => o.Attribute).Fetch.Join(); References(o => o.Station); } } public class StationMap : ClassMap<Station> { public StationMap() { Id(o => o.Id); HasMany(o => o.AttributeRules).Inverse(); } } I would like to order the AttributeRules list on Station by the Attribute.Name property, but doing the following does not work: HasMany(o => o.AttributeRules).Inverse().OrderBy("Attribute.Name"); I have not found a way to do this yet in the mappings. I could create a IQuery or ICriteria to do this for me, but ideally I would just like to have the AttributeRules list sorted when I ask for it. Any advice on how to do this mapping?

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• c# finalizer throwing exception?

  - by sjhuk

  Quote from MSDN: If Finalize or an override of Finalize throws an exception, the runtime ignores the exception, terminates that Finalize method, and continues the finalization process. Yet if I have: ~Person() { throw new Exception("meh"); } then it results in a runtime exception? p.s. I know that this should never happen, however I'm just curious around this behaviour. One of our clients had an empty try catch around all of their finalizers.. it didn't even log when things went wrong or reserect the object :/

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• Hibernate query for multiple items in a collection

  - by aarestad

  I have a data model that looks something like this: public class Item { private List<ItemAttribute> attributes; // other stuff } public class ItemAttribute { private String name; private String value; } (this obviously simplifies away a lot of the extraneous stuff) What I want to do is create a query to ask for all Items with one OR MORE particular attributes, ideally joined with arbitrary ANDs and ORs. Right now I'm keeping it simple and just trying to implement the AND case. In pseudo-SQL (or pseudo-HQL if you would), it would be something like: select all items where attributes contains(ItemAttribute(name="foo1", value="bar1")) AND attributes contains(ItemAttribute(name="foo2", value="bar2")) The examples in the Hibernate docs didn't seem to address this particular use case, but it seems like a fairly common one. The disjunction case would also be useful, especially so I could specify a list of possible values, i.e. where attributes contains(ItemAttribute(name="foo", value="bar1")) OR attributes contains(ItemAttribute(name="foo", value="bar2")) -- etc. Here's an example that works OK for a single attribute: return getSession().createCriteria(Item.class) .createAlias("itemAttributes", "ia") .add(Restrictions.conjunction() .add(Restrictions.eq("ia.name", "foo")) .add(Restrictions.eq("ia.attributeValue", "bar"))) .list(); Learning how to do this would go a long ways towards expanding my understanding of Hibernate's potential. :)

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• Do I need to explicitly destroy JavaScript objects on window unload?

  - by Bilal Aslam

  I have a JavaScript widget that is hosted on websites. This widget tracks state in a number of variables in its local namespace. Moreover, it attaches listeners for several events, such as mouse movement. Should I explicitly destroy both state-tracking variables and detach event listeners on window unload? Or is it ok to rely on the browser to do a good job of cleaning up after the user leaves the page that hosts my widget?

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• How does the Garbage-First Garbage Collector work?

  - by fahdshariff

  Hi Can someone explain how the G1 Garbage Collector works please? I haven't been able to find any comprehensive, easy-to-understand descriptions anywhere yet. Thanks

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• Fetching value from collection

  - by user334119

  public string GetProductVariantImageUrl(ShoppingCartItem shoppingCartItem) { string pictureUrl = String.Empty; ProductVariant productVariant = shoppingCartItem.ProductVariant; ProductVariantAttributeValueCollection pvaValues = shoppingCartItem.Attributes; [here the count comes 0]{case1} } public string GetAttributeDescription(ShoppingCartItem shoppingCartItem) { string result = string.Empty; ProductVariant productVariant = shoppingCartItem.ProductVariant; if (productVariant != null) { ProductVariantAttributeValueCollection pvaValues = shoppingCartItem.Attributes;[here count is 1] } } WHY am i not able to get count as 1 for the case1. /// <summary> /// Represents a shopping cart item /// </summary> public class ShoppingCartItem : BaseEntity { #region Fields private ProductVariant _cachedProductVariant; private ProductVariantAttributeValueCollection _cachedPvaValues; #endregion #region Ctor /// <summary> /// Creates a new instance of the shopping cart class /// </summary> public ShoppingCartItem() { } #endregion #region Properties /// <summary> /// Gets or sets the shopping cart item identifier /// </summary> public int ShoppingCartItemID { get; set; } /// <summary> /// Gets or sets the shopping cart type identifier /// </summary> public int ShoppingCartTypeID { get; set; } /// <summary> /// Gets or sets the customer session identifier /// </summary> public Guid CustomerSessionGUID { get; set; } /// <summary> /// Gets or sets the product variant identifier /// </summary> public int ProductVariantID { get; set; } /// <summary> /// Gets or sets the product variant attribute identifiers /// </summary> public List<int> AttributeIDs { get; set; } /// <summary> /// Gets or sets the text option /// </summary> public string TextOption { get; set; } /// <summary> /// Gets or sets the quantity /// </summary> public int Quantity { get; set; } /// <summary> /// Gets or sets the date and time of instance creation /// </summary> public DateTime CreatedOn { get; set; } /// <summary> /// Gets or sets the date and time of instance update /// </summary> public DateTime UpdatedOn { get; set; } #endregion #region Custom Properties /// <summary> /// Gets the log type /// </summary> public ShoppingCartTypeEnum ShoppingCartType { get { return (ShoppingCartTypeEnum)ShoppingCartTypeID; } } /// <summary> /// Gets the product variant /// </summary> public ProductVariant ProductVariant { get { if (_cachedProductVariant == null) { _cachedProductVariant = ProductManager.GetProductVariantByID(ProductVariantID); } return _cachedProductVariant; } } /// <summary> /// Gets the product variant attribute values /// </summary> public ProductVariantAttributeValueCollection Attributes { get { if (_cachedPvaValues == null) { ProductVariantAttributeValueCollection pvaValues = new ProductVariantAttributeValueCollection(); foreach (int attributeID in this.AttributeIDs) { ProductVariantAttributeValue pvaValue = ProductAttributeManager.GetProductVariantAttributeValueByID(attributeID); if (pvaValue != null) pvaValues.Add(pvaValue); } _cachedPvaValues = pvaValues; } return _cachedPvaValues; } } /// <summary> /// Gets the total weight /// </summary> public decimal TotalWeigth { get { decimal totalWeigth = decimal.Zero; ProductVariant productVariant = ProductVariant; if (productVariant != null) { decimal attributesTotalWeight = decimal.Zero; foreach (ProductVariantAttributeValue pvaValue in this.Attributes) { attributesTotalWeight += pvaValue.WeightAdjustment; } decimal unitWeight = productVariant.Weight + attributesTotalWeight; totalWeigth = unitWeight * Quantity; } return totalWeigth; } } /// <summary> /// Gets a value indicating whether the shopping cart item is free shipping /// </summary> public bool IsFreeShipping { get { ProductVariant productVariant = this.ProductVariant; if (productVariant != null) return productVariant.IsFreeShipping; return true; } }

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• Ruby 1.9 GarbageCollector, GC.disable/enable

  - by seb

  I'm developing a Rails 2.3, Ruby 1.9.1 webapplication that does quite a bunch of calculation before each request. For every request it has to calculate a graph with 300 nodes and ~1000 edges. The graph and all its nodes, edges and other objects are initialized for every request (~2000 objects) - actually they are cloned from an uncalculated cached graph using Marshal.load(Marshal.dump()). Performance is quite an issue here. Right now the whole request takes in average 150ms. I then saw that during a request, parts of the calculation randomly take longer. Assuming, that this might be the GarbageCollector kicking in, I wrapped the request in GC.disable and GC.enable, so that the request waits with garbagecollecting until calculating and rendering have finished. def query GC.disable calculate respond_to do |format| format.html {render} end GC.enable end The average request now takes about 100ms (50 ms less). But I'm unsure if this is a good/stable solution, I assume there must be drawbacks doing that. Does anybody has experience with a similar problem or sees problems with the above code?

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