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• Flash Backed Write Cache (FBWC) without capacitor pack

  - by Martyn

  I brought a HP Smart Array P410 controller and it is installed and working fine in a HP Prolient Microserver with 4 drives in two RAID 1 arrays. I didn’t realise however that it came without any cache so would only work by directly writing straight to the disk, and the performance was horrible. So I then brought the 512MB Flash Backed Write Cache (FBWC) memory module as I was under the impression that with FBWC I would not need a battery. I got this idea from a forum post. "What do you guys think of the choice between 'BBWC' (battery backed write cache) and 'FBWC' (flash backed write cache)? The flashed based ones use non-volitile memory so need no battery." After installing the cache module however the server pretty much won’t boot. The P410 has a flashing amber light on it, and from the manual that doesn’t sound good. I’ve managed to get to the on board BIOS once and even managed to get to boot to the HP Array Configuration Utility (ACU) CD once, but every other time the Server continuingly reboots once it get to the POST screen and reads ARRAY INITILIZING %%%. The one time I reached the ACU, it reported a problem with the Cache Module. To me, it seems like the cache module is faulty, however the supplier tells me “Do you have an FBWC battery pack, p/n 587324-001, because that is required for the cache to work. If you have it, please complete an RMA form and we'll send a replacement / credit.” Does this sound right to you? I’ve been ordering the parts from the US and I don’t want to spend $77 + $40 p&p on a battery, wait a week for the shipping to find the card is faulty, and I don’t want to send back a working card?

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• How do I tell Windows to use 802.11 in preference to 3G?

  - by Jon Skeet

  I have a Samsung NC-10 netbook which I take to work every day. Most of the time I use it just on the train/bus, but I also use it at work and home. It has a built-in 3G card which I want to use when travelling, but I'd prefer to use wifi when I'm at work or home, for obvious reasons. Unfortunately, if the 3G connection is up, Windows appears to use that in preference to wifi. Starting up and shutting down the 3G modem is a bit of a pain - it's not hard as such, just a bit inconvenient. Ideally I'd like it to always be up, and even have the connection itself up all the time, but without routing traffic through it if there's a wifi connection up. This is what my Android phone does, for example. Is there somewhere in Windows which lets me express an ordering for network interfaces? I suspect the routing table may be relevant, but it's a bit of a pain to mess around with. I'd really expect there to be a simple GUI way of setting this up - after all, it would equally be useful when dealing with wired vs wifi connections. I'm currently using Windows XP Home, but Windows 7 answers would also be useful as I'll be migrating soon.

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• Adventures in Drupal multisite config with mod_rewrite and clean urls

  - by moexu

  The university where I work is planning to offer Drupal hosting to staff/faculty who want a Drupal site. We've set up Drupal multisite with clean urls and it's mostly working except for some weird redirects. If you have two sites where one is a substring of the other then you'll randomly be redirected to the other site. I tracked the problem to how mod_rewrite does path matching, so with a config file like this: RewriteCond %{REQUEST_URI} ^/drupal RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule ^(.*)$ /drupal/index.php?q=$1 [last,qsappend] RewriteCond %{REQUEST_URI} ^/drupaltest RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule ^(.*)$ /drupaltest/index.php?q=$1 [last,qsappend] /drupaltest will match the /drupal line and all of the links on the /drupaltest page will be rewritten to point to /drupal. If you put the end of string character ($) at the end of each rewrite condition then it will always match on the correct site and the links will always be rewritten correctly. That breaks down as soon as a user logs in though because the query string is appended to the url so just the base url will no longer match. You can also fix the problem by ordering the sites in the config file so that the smallest substring will always be last. I suggested storing all of the sites in a table and then querying, sorting, and rewriting the config file every time a Drupal site is requested so that we could guarantee the order. The system administrator thought that was kludgy and didn't address the root problem. Disabling clean urls should also fix the problem but the users really want them so I'd prefer to keep them if possible. I think we could also fix it by using an .htaccess file in each site to handle the clean url rewriting but that also seems suboptimal since it will generate a higher load on the server and the server is intended to host the majority of the university's external facing web content. Is there some magic I can do with mod_rewrite to get it to work? Would another solution be better? Am I doing something the wrong way to begin with?

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• Optimize Apache performance

  - by Phliplip

  I'm looking for ways to optimize our current web server hosted in-house. I'm trying to supply as much relevant information below. Please let me know if you would require additional information in order to assist. Server is running 1 single website, which is an online pizza ordering platform built on Zend Framework (ver1). On traffic stats from the last month aprox 6.000 pageloads per day, concentrated mainly around dinnertime. Around 1500 loads/hour peaks in that period. We recently upgraded from a 2/2mbit aDSL-line to 100/100mbit fiber, and we still have performance issues at dinner time. We assumed the 2mbit was the issue. Website is pretty snappy in low-load periods. Hardware CPU: Intel(R) Xeon(R) CPU 5160 @ 3.00GHz (3000.13-MHz K8-class CPU) Mem: 328M Active, 4427M Inact, 891M Wired, 244M Cache, 623M Buf, 33M Free Swap: 16G Total, 468K Used, 16G Free (6GB physical, 16GB swap) Filesystem Type Size Used Avail Capacity Mounted on /dev/ad7s1a ufs 4.8G 768M 3.7G 17% / devfs devfs 1.0K 1.0K 0B 100% /dev /dev/ad7s1g ufs 176G 5.2G 157G 3% /home /dev/ad7s1e ufs 4.8G 2.8M 4.5G 0% /tmp /dev/ad7s1f ufs 19G 3.5G 14G 19% /usr /dev/ad7s1d ufs 4.8G 550M 3.9G 12% /var Server OS FreeBSD 8.2-RELEASE Software apache-2.2.17 php5-5.3.8 mysql-server-5.5 Apache footprint (example, taken from # top) 31140 www 1 45 0 377M 41588K lockf 2 0:00 0.00% httpd 31122 www 1 44 0 375M 35416K lockf 2 0:00 0.00% httpd 31109 www 1 44 0 375M 38188K lockf 2 0:00 0.00% httpd 31113 www 1 44 0 375M 35188K lockf 2 0:00 0.00% httpd Apache is using the prefork MPM, APC (Alternative PHP Cache). SSL module is loaded, but not utilized (as in don't really work, thus not used). There is a file containing settings for MPM modules, but as i see it's not included in the httpd.conf file, the include line is commented out. Thus i would guess that the prefork MPM is working of default values too. Here are some other Apache conf values that i found - which are included in https.conf Timeout 300 KeepAlive On MaxKeepAliveRequests 100 KeepAliveTimeout 5 UseCanonicalName Off HostnameLookups Off

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• jQuery FullCalendar - trying to add event and display on calendar failed

  - by Michael Mao

  Hi all: I am trying to work out how to use Adam Shaw's brilliant jQuery plugin - FullCalendar to add an event on our project : online balloon ordering page under development Basically, if you click on "step1" and choose "pickup in shop" , the page will bring you to the calendar view, where you could click on the upper-right corner at the "week" button to alter the view to a weekly basis. What I am trying to achieve is when client clicks on an empty slot in a day, she can create her event on that spot. Here is my code in custom.js: dayClick: function() { var n = parseInt(this.className.match(/fc\-slot(\d+)/)[1]); alert('a day has been clicked on slot ' + n); //trying to add an event using the renderEvent() method. $('#' + type + 'Calendar').fullCalendar('renderEvent', { title : 'my pickup slot', start : new Date(y,m,d, 12, 30), end : new Date(y,m,d, 13, 00), }); } It tries to use the FullCalendar's API method renderEvent so to create such an event. However, although my code runs without error and I can see the prompt saying which slot has been clicked, It wouldn't render such an new event on calendar. Is there another way to do this or my code does something wrong? Any suggestion would be much appreciated, thanks a lot in advance.

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• Need to override drawrect if your UIView is merely a container?

  - by Greg Maletic

  According to Apple's docs, "Subclasses need not override -[UIView drawRect:] if the subclass is a container for other views." I have a custom UIView subclass that is indeed merely a container for other views. Yet the contained views aren't getting drawn. Here's the pertinent code that sets up the custom UIView subclass: - (id)initWithFrame:(CGRect)frame { if ((self = [super initWithFrame:frame])) { // Consists of both an "on" light and an "off" light. We flick between the two depending upon our state. self.onLight = [[[LoyaltyCardNumberView alloc] initWithFrame:frame] autorelease]; self.onLight.backgroundColor = [UIColor clearColor]; self.onLight.on = YES; [self addSubview:self.onLight]; self.offLight = [[[LoyaltyCardNumberView alloc] initWithFrame:frame] autorelease]; self.offLight.backgroundColor = [UIColor clearColor]; self.offLight.on = NO; [self addSubview:self.offLight]; self.on = NO; } return self; } When I run the code that displays this custom UIView, nothing shows up. But when I add a drawRect method... - (void)drawRect:(CGRect)rect { [self.onLight drawRect:rect]; [self.offLight drawRect:rect]; } ...the subviews display. (Clearly, this isn't the right way to be doing this, not only because it's contrary to what the docs say, but because it -always- displays both subviews, completely ignoring some other code in my UIView that sets the hidden property of one of the views, it ignores the z-ordering, etc.) Anyway, the main question: why don't my subviews display when I'm not overriding drawRect:? Thanks!

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• Random MKAnnotationView is tapped when there are overlapping annotations

  - by Alexandre Gellibert

  I cannot believe this bug/problem doesn't have any solution! In my iphone application, I'm using MapKit with MKMapView and custom MKAnnotationView. The problem is when annotations overlap (in my app, annotations are photos and those photos may overlap) and when you tap on the annotation that appears on front, other annotation (on back) receives the event (seems to be random). I didn't find any way to send the event to the front annotation. Z ordering and Order of overlapping annotations questions on stackoverflow did not help me that much. Please any idea is welcome (even ugly ones)! Here's some of my code (nothing fancy, very common): CustomAnnotation.h @interface CustomAnnotation : NSObject <MKAnnotation> { @private CustomAnnotationView* view; } @property (nonatomic, retain) CustomAnnotationView* view; @end CustomAnnotation.m @implementation CustomAnnotation @synthetize view; CustomAnnotationView.h @interface CustomAnnotationView : MKAnnotationView { } @end CustomAnnotationView.m @implementation CustomAnnotationView - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{ // Do something related to the annotation tapped } @end Main class ... // Annotations are added and some of them overlaps with others. - (void)addAnnotation:(CustomAnnotation*)annotation { [map addAnnotation:annotation]; } ... - (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation { NSString* identifier = getIdentifierFromAnnotation(annotation); CustomAnnotationView* view; if(!(view = (CustomAnnotationView*)[map dequeueReusableAnnotationViewWithIdentifier:identifier])) { view = [[CustomAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier: identifier]; [(CustomAnnotation*)annotation setView:view]; [view release]; } return view; }

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• Create custom rewrite rule for my WordPress plugin

  - by kitsched

  I'm writing a plug-in for WordPress which in fact will be a separate ordering module (it will be placed in an IFRAME on the site I'm developing as well as others) but with its admin tied into WordPress. I wrote the administration part without too much hassle, however I'm having trouble with the front-end. First of all I'd like my script to be accessible via www.mysite.com/order/ and, as per the WordPress codex, I found I need to place the following code into my main plugin file: add_action('init', 'ta_flush_rewrite_rules'); function ta_flush_rewrite_rules() { global $wp_rewrite; $wp_rewrite->flush_rules(); } add_action('generate_rewrite_rules', 'ta_add_rewrite_rules'); function ta_add_rewrite_rules( $wp_rewrite ) { $new_rules = array("order/(.+)" => "/wp-content/plugins/my-plugin/order.php"); $wp_rewrite->rules = $new_rules + $wp_rewrite->rules; } But it doesn't work and I don't really want to get dirty with .htaccess hacking. Furthermore even if this would work, the order.php file is a separate file from my plugin. This means that I'll have to include some WordPress files in order to have access to the database and other helper classes and functions. That brings us to question number 2: is there a way for the URL to call a function of my plugin to render the order page?

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• Customizing doxygen output for the HTML Table of Contents

  - by ILR

  I'm using doxygen to generate an API reference from source code, aiming to convert it into a CHM help file and eventually into a plugin for Eclipse. Unfortunately the default ordering and nesting of the classes, namespaces, etc. in the Table of Contents is not exactly ideal and I'd prefer to customize it if possible. By default, doxygen creates two indexes/menus for navigating the generated documentation. One is the common Table of Contents on the left frame and the other is the row of buttons at the top of each individual HTML page. The latter can be comfortably customized by editing the layout xml file as described in doxygen manual (see section 'Changing the layout of pages') but so far I've seen no way to do similar modifications for the Table of Contents. To use a precise example, I'm looking for a way to nest the three standard topics Class List, Class Hierarchy, and Class Members as subtopics inside a parent topic in the TOC, as is done by default in the menu system that's located on top of every page. I'd imagine this is not the most unusual issue and may have a known solution available. Thanks for your assistance!

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• Content Management System Where the Content needs to reside

  - by lee

  Hi, We are developing a Online Ordering Website and we are planning to be completely flexible in the sense Layout can be changed, Color, Font , and in a page a component(div) can be added. In this case whether we need to store all our View Code for example <div id="MenuContent"> <div> <h4> Your Order</h4> <hr /> <%if (Model != null) { %> <table width="100%"> <thead> <tr> <th> Item </th> <th> Quantity </th> <th> Price </th> <th> Remove </th> <th> Total </th> </tr> </thead> ...... in the database or we can just store the div id and based on that load a view which is avalaible in the file system. Any Pointers is greatly appreciated.

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• Design patter to keep track UITableView rows correspondance to underlying data in constant time.

  - by DenNukem

  When my model changes I want to animate changes in UITableView by inserting/deleting rows. For that I need to know the ordinal of the given row (so I can construct NSIndexPath), which I find hard to do in better-than-linear time. For example, consider that I have a list of addressbook entries which are manualy sorted by the user, i.e. there is no ordering "key" that represents the sort order. There is also a corresponding UITableView that shows one row per addressbook entry. When UITableView queries the datasource I query the NSMUtableArray populated with my entries and return required data in constant time for each row. However, if there is a change in underlying model I am getting a notification "Joe Smith, id#123 has been removed". Now I have a dilemma. A naive approach would be to scan the array, determine the index at which Joe Smith is and then ask UITableView to remove that precise row from the view, also removing it form the array. However, the scan will take linear time to finish. Now I could have an NSDictionary which allows me to find Joe Smith in constant time, but that doesn't do me a lot of good because I still need to find his ordinal index within the array in order to instruct UITableView to remove that row, which is again a linear search. I could further decide to store each object's ordinal inside the object itself to make it constant, but it will become outdated after first such update as all subsequent index values will have changed due to removal of an object. So what is the correct design pattern to accurately reflect model changes in the UITableView in costant (or at least logarithmic) time?

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• Django ForeignKey TemplateSyntaxError and ProgrammingError

  - by Daniel Garcia

  This is are my models i want to relate. i want for collection to appear in the form of occurrence. class Collection(models.Model): id = models.AutoField(primary_key=True, null=True) code = models.CharField(max_length=100, null=True, blank=True) address = models.CharField(max_length=100, null=True, blank=True) collection_name = models.CharField(max_length=100) def __unicode__(self): return self.collection_name class Meta: db_table = u'collection' ordering = ('collection_name',) class Occurrence(models.Model): id = models.AutoField(primary_key=True, null=True) reference = models.IntegerField(null=True, blank=True, editable=False) collection = models.ForeignKey(Collection, null=True, blank=True, unique=True), modified = models.DateTimeField(null=True, blank=True, auto_now=True) class Meta: db_table = u'occurrence' Every time i go to check the Occurrence object i get this error TemplateSyntaxError at /admin/hotiapp/occurrence/ Caught an exception while rendering: column occurrence.collection_id does not exist LINE 1: ...LECT "occurrence"."id", "occurrence"."reference", "occurrenc.. And every time i try to add a new occurrence object i get this error ProgrammingError at /admin/hotiapp/occurrence/add/ column occurrence.collection_id does not exist LINE 1: SELECT (1) AS "a" FROM "occurrence" WHERE "occurrence"."coll... What am i doing wrong? or how does ForeignKey works?

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• overriding enumeration base type using pragma or code change

  - by vprajan

  Problem: I am using a big C/C++ code base which works on gcc & visual studio compilers where enum base type is by default 32-bit(integer type). This code also has lots of inline + embedded assembly which treats enum as integer type and enum data is used as 32-bit flags in many cases. When compiled this code with realview ARM RVCT 2.2 compiler, we started getting many issues since realview compiler decides enum base type automatically based on the value an enum is set to. http://www.keil.com/support/man/docs/armccref/armccref_Babjddhe.htm For example, Consider the below enum, enum Scale { TimesOne, //0 TimesTwo, //1 TimesFour, //2 TimesEight, //3 }; This enum is used as a 32-bit flag. but compiler optimizes it to unsigned char type for this enum. Using --enum_is_int compiler option is not a good solution for our case, since it converts all the enum's to 32-bit which will break interaction with any external code compiled without --enum_is_int. This is warning i found in RVCT compilers & Library guide, The --enum_is_int option is not recommended for general use and is not required for ISO-compatible source. Code compiled with this option is not compliant with the ABI for the ARM Architecture (base standard) [BSABI], and incorrect use might result in a failure at runtime. This option is not supported by the C++ libraries. Question How to convert all enum's base type (by hand-coded changes) to use 32-bit without affecting value ordering? enum Scale { TimesOne=0x00000000, TimesTwo, // 0x00000001 TimesFour, // 0x00000002 TimesEight, //0x00000003 }; I tried the above change. But compiler optimizes this also for our bad luck. :( There is some syntax in .NET like enum Scale: int Is this a ISO C++ standard and ARM compiler lacks it? There is no #pragma to control this enum in ARM RVCT 2.2 compiler. Is there any hidden pragma available ?

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• Java AtomicInteger: what are the differences between compareAndSet and weakCompareAndSet?

  - by WizardOfOdds

  (note that this question is not about CAS, it's about the "May fail spuriously" Javadoc). The only difference in the Javadoc between these two methods from the AtomicInteger class is that the weakCompareAndSet contains the comment: "May fail spuriously". Now unless my eyes are cheated by some spell, both method do look to be doing exactly the same: public final boolean compareAndSet(int expect, int update) { return unsafe.compareAndSwapInt(this, valueOffset, expect, update); } /* ... * May fail spuriously. */ public final boolean weakCompareAndSet(int expect, int update) { return unsafe.compareAndSwapInt(this, valueOffset, expect, update); } So I realize that "May" doesn't mean "Must" but then why don't we all start adding this to our codebase: public void doIt() { a(); } /** * May fail spuriously */ public void weakDoIt() { a(); } I'm really confused with that weakCompareAndSet() that appears to do the same as the compareAndSet() yet that "may fail spuriously" while the other can't. Apparently the "weak" and the "spurious fail" are in a way related to "happens-before" ordering but I'm still very confused by these two AtomicInteger (and AtomicLong etc.) methods: because apparently they call exactly the same unsafe.compareAndSwapInt method. I'm particularly confused in that AtomicInteger got introduced in Java 1.5, so after the Java Memory Model change (so it is obviously not something that could "fail spuriously in 1.4" but whose behavior changed to "shall not fail spuriously in 1.5").

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• How do I reference Django Model from another model

  - by user313943

  Im looking to create a view in the admin panel for a test program which logs Books, publishers and authors (as on djangoproject.com) I have the following two models defined. class Author(models.Model): first_name = models.CharField(max_length=30) last_name = models.CharField(max_length=30) email = models.EmailField() def __unicode__(self): return u'%s %s' % (self.first_name, self.last_name) class Book(models.Model): title = models.CharField(max_length=100) authors = models.ManyToManyField(Author) publisher = models.ForeignKey(Publisher) publication_date = models.DateField() def __unicode__(self): return self.title What I want to do, is change the Book model to reference the first_name of any authors and show this using admin.AdminModels. #Here is the admin model I've created. class BookAdmin(admin.ModelAdmin): list_display = ('title', 'publisher', 'publication_date') # Author would in here list_filter = ('publication_date',) date_hierarchy = 'publication_date' ordering = ('-publication_date',) fields = ('title', 'authors', 'publisher', 'publication_date') filter_horizontal = ('authors',) raw_id_fields = ('publisher',) As I understand it, you cannot have two ForeignKeys in the same model. Can anyone give me an example of how to do this? I've tried loads of different things and its been driving me mad all day. Im pretty new to Python/Django. Just to be clear - I'd simply like the Author(s) First/Last name to appear alongside the book title and publisher name. Thanks

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• Table design issues - should I create separate fields or store as a blob

  - by Ali

  Hi guys I'm working on my web based ordering system and we would like to maintain a kind of task history for each of our orders. A hsitory in the sense that we would like to maintain a log of who did what on an order like lets say an order has been entered - we would like to know if the order was acknowledged for an example. Or lets say somebody followed up on the order - etc. Consider that there are numerous situations like this for each order would it be wise to create a schema on the lines of: Orders ID - title - description - date - is_ack - is_follow - ack_by ..... That accounts to a lot of fields - on teh other hand I could have one LongText field called 'history' and fill it with a serialised object holding all the information. However in the latter case I can't run a query to lets say retrieve all orders that have not been acknowledged and stuff like that. With time requirements woudl change and I would be required to modify it to allow for more detailed tracking and that is why I need to set up a way which would be feasible to scale upon yet I don't want to be restricted on the SQL side too much.

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• How to do custom display and auto-select in django admin multi-select field?

  - by rsp

  I'm new to django, so please feel free to tell me if I'm doing this incorrectly. I am trying to create a django ordering system. My order model: class Order(models.Model): ordered_by = models.ForeignKey(User, limit_choices_to = {'groups__name': "Managers", 'is_active': 1}) in my admin ANY user can enter an order, but ordered_by must be someone in the group "managers" (this is the behavior I want). Now, if the logged in user happens to be a manager I want it to automatically fill in the field with that logged in user. I have accomplished this by: class OrderAdmin(admin.ModelAdmin): def formfield_for_foreignkey(self, db_field, request, **kwargs): if db_field.name == "ordered_by": if request.user in User.objects.filter(groups__name='Managers', is_active=1): kwargs["initial"] = request.user.id kwargs["empty_label"] = "-------------" return db_field.formfield(**kwargs) return super(OrderAdmin, self).formfield_for_foreignkey(db_field, request, **kwargs) This also works, but the admin puts the username as the display for the select box by default. It would be nice to have the user's real name listed. I was able to do it with this: class UserModelMultipleChoiceField(forms.ModelMultipleChoiceField): def label_from_instance(self, obj): return obj.first_name + " " + obj.last_name class OrderForm(forms.ModelForm): ordered_by = UserModelChoiceField(queryset=User.objects.all().filter(groups__name='Managers', is_active=1)) class OrderAdmin(admin.ModelAdmin): form = OrderForm My problem: I can't to both of these. If I put in the formfield_for_foreignkey function and add form = OrderForm to use my custom "UserModelChoiceField", it puts the nice name display but it won't select the currently logged in user. I'm new to this, but my guess is that when I use UserModelChoiceField it "erases" the info passed in via formfield_for_foreignkey. Do I need to use the super() function somehow to pass on this info? or something completely different?

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• Error generating Interface with svcutil.exe

  - by capdragon

  Can someone help me generate the Interface (c#) file for the following OGC schema? Schema files: Download Schema Files Link I need to create web services for the Ordering wsdl in the schema zip file above. I've been at it for days now with no luck generating the interface. I've tried: svcutil.exe thewsdl.wsdl /language:c# /out:ITheInterface.cs svcutil Order.wsdl /out:IOrder.cs svcutil Order.wsdl Order.xsd ..\ws-addressing\ws-addr.xsd /out:IOrder.cs svcutil Order.wsdl Order.xsd ws-addr.xsd /out:IOrder.cs and i get the following error: Microsoft (R) Service Model Metadata Tool [Microsoft (R) Windows (R) Communication Foundation, Version 4.0.30319.1] Copyright (c) Microsoft Corporation. All rights reserved. Error: Cannot read ws-addr.xsd. Cannot load file D:\Documents\DEV\SARPilot\Docs\eoschema\schema\OrderSchema\ws-addr.xsd as an Assembly. Check the FusionLogs f or more Information. Could not load file or assembly 'file:///D:\Documents\DEV\SARPilot\Docs\eoschema\schema\OrderSchema\ws-addr.xsd' or one of its dependencies. The module was expected to contain an assembly manifest.

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• DataGrid finding a control

  - by nat

  HI I have a DataGrid (yes would be nicer if it was a gridview but nothing i can do about that) in the itemDataBound event i am adding a hidden field into the first cell of each row I am setting its ID based on something, and then saving its clientID in a List for later attempts to get the value from it but try as i might i cant find anything with findcontrol have tried here is the itemdatabound bit foreach(page in datasource){ HiddenField hidOrder = new HiddenField(); hidOrder.ID = "order_" + page.Id.ToString(); hidOrder.Value = page.Ordering.ToString(); e.Item.Cells[0].Controls.Add(hidOrder); idList.Add(hidOrder.ClientID); } then this is a button click event.. int numRows = FrontEndDataGrid.Items.Count; for (int i = 0; i < numRows; i++){ foreach(string hidID in idList){ HiddenField hf = FrontEndDataGrid.Items[i].FindControl(hidID) as HiddenField; //ssadly this never finds anything //have also tried looping around the cells for each 'row' - no luck there either } } any ideas? thanks nat

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• Execution time in nano seconds and related issues

  - by anup

  Hi All, I am using the following code to compute execution time in milli-secs. struct timespec tp; if (clock_gettime (CLOCK_REALTIME, &tp) == 0) return ((tp.tv_sec * 1000000000) + tp.tv_nsec); else return ; Can you please tell me whether this is correct? Let's name this function comptime_nano(). Now, I write the following code in main() to check execution times of following operations. unsigned long int a, b, s1, s3; a = (unsigned long int)(1) << 63; b = (unsigned long int)(1) << 63; btime = comptime_nano(); s1 = b >> 30; atime = comptime_nano(); printf ("Time =%ld for %lu\n", (atime - btime), s1); btime = comptime_nano(); s3 = a >> 1; atime = comptime_nano(); printf ("Time =%ld for %lu\n", (atime - btime), s3); To my surprise, the first operation takes about roughly 4 times more time than the second. Again, if I change the relative ordering of these operations, the respective timings change drastically. Please comment...

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• codingBat separateThousands using regex (and unit testing how-to)

  - by polygenelubricants

  This question is a combination of regex practice and unit testing practice. Regex part I authored this problem separateThousands for personal practice: Given a number as a string, introduce commas to separate thousands. The number may contain an optional minus sign, and an optional decimal part. There will not be any superfluous leading zeroes. Here's my solution: String separateThousands(String s) { return s.replaceAll( String.format("(?:%s)|(?:%s)", "(?<=\\G\\d{3})(?=\\d)", "(?<=^-?\\d{1,3})(?=(?:\\d{3})+(?!\\d))" ), "," ); } The way it works is that it classifies two types of commas, the first, and the rest. In the above regex, the rest subpattern actually appears before the first. A match will always be zero-length, which will be replaceAll with ",". The rest basically looks behind to see if there was a match followed by 3 digits, and looks ahead to see if there's a digit. It's some sort of a chain reaction mechanism triggered by the previous match. The first basically looks behind for ^ anchor, followed by an optional minus sign, and between 1 to 3 digits. The rest of the string from that point must match triplets of digits, followed by a nondigit (which could either be $ or \.). My question for this part is: Can this regex be simplified? Can it be optimized further? Ordering rest before first is deliberate, since first is only needed once No capturing group Unit testing part As I've mentioned, I'm the author of this problem, so I'm also the one responsible for coming up with testcases for them. Here they are: INPUT, OUTPUT "1000", "1,000" "-12345", "-12,345" "-1234567890.1234567890", "-1,234,567,890.1234567890" "123.456", "123.456" ".666666", ".666666" "0", "0" "123456789", "123,456,789" "1234.5678", "1,234.5678" "-55555.55555", "-55,555.55555" "0.123456789", "0.123456789" "123456.789", "123,456.789" I haven't had much experience with industrial-strength unit testing, so I'm wondering if others can comment whether this is a good coverage, whether I've missed anything important, etc (I can always add more tests if there's a scenario I've missed).

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• Hibernate ScrollableResults Do Not Return The Whole Set of Results

  - by mlaverd

  Some of the queries we run have 100'000+ results and it takes forever to load them and then send them to the client. So I'm using ScrollableResults to have a paged results feature. But we're topping at roughly 50k results (never exactly the same amount of results). I'm on an Oracle9i database, using the Oracle 10 drivers and Hibernate is configured to use the Oracle9 dialect. I tried with the latest JDBC driver (ojdbc6.jar) and the problem was reproduced. We also followed some advice and added an ordering clause, but the problem was reproduced. Here is a code snippet that illustrates what we do: Criteria crit = sess.createCriteria(ABC.class); crit.add(Restrictions.eq("property", value)); crit.setFetchSize(pageSize); crit.addOrder(Order.asc("property")); ScrollableResults sr = crit.scroll(); ... ... do{ for (Object entry : page) sess.evict(entry); //to avoid having our memory just explode out of proportion page.clear(); for (int i =0 ; i < pageSize && ! metLastRow; i++){ if (resultSet.next()) page.add(sr.get(0)); else metLastRow = true; } metLastRow = metLastRow?metLastRow:sr.isLast(); sendToClient(page); }while(!metLastRow); So, why is it that I get the result set to tell me its at the end when it should be having so much more results?

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• Why is my logic not working correctly for SPOJ TOPOSORT?

  - by Kavish Dwivedi

  The given problem is http://www.spoj.com/problems/TOPOSORT/ The output format is particularly important as : Print "Sandro fails." if Sandro cannot complete all his duties on the list. If there is a solution print the correct ordering, the jobs to be done separated by a whitespace. If there are multiple solutions print the one, whose first number is smallest, if there are still multiple solutions, print the one whose second number is smallest, and so on. What I am doing is simply doing dfs by reversing the edges i.e if job A finishes before job B, there is a directed edge from B to A . I am maintaining the order by sorting the adjacency list I created and storing the nodes which don't have any constraints separately so as to print them later in correct order . There are two flag arrays used , one for marking discovered node and one for marking the node whose all neighbors have been explored. Now my solution is http://www.ideone.com/QCUmKY (the important function is the visit funtion ) and its giving WA after running correct for 10 cases so its really hard to figure out where am I doing it wrong since it runs for all of the test cases which I have done by hand.

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• F# passing an operator with arguments to a function

  - by dan

  Can you pass in an operation like "divide by 2" or "subtract 1" using just a partially applied operator, where "add 1" looks like this: List.map ((+) 1) [1..5];; //equals [2..6] // instead of having to write: List.map (fun x-> x+1) [1..5] What's happening is 1 is being applied to (+) as it's first argument, and the list item is being applied as the second argument. For addition and multiplication, this argument ordering doesn't matter. Suppose I want to subtract 1 from every element (this will probably be a common beginners mistake): List.map ((-) 1) [1..5];; //equals [0 .. -4], the opposite of what we wanted 1 is applied to the (-) as its first argument, so instead of (list_item - 1), I get (1 - list_item). I can rewrite it as adding negative one instead of subtracting positive one: List.map ((+) -1) [1..5];; List.map (fun x -> x-1) [1..5];; // this works too I'm looking for a more expressive way to write it, something like ((-) _ 1), where _ denotes a placeholder, like in the Arc language. This would cause 1 to be the second argument to -, so in List.map, it would evaluate to list_item - 1. So if you wanted to map divide by 2 to the list, you could write: List.map ((/) _ 2) [2;4;6] //not real syntax, but would equal [1;2;3] List.map (fun x -> x/2) [2;4;6] //real syntax equivalent of the above Can this be done or do I have to use (fun x -> x/2)? It seems that the closest we can get to the placeholder syntax is to use a lambda with a named argument.

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• Ordered delivery with NetNamedPipeBinding using oneWay calls

  - by Aseem Bansal

  Is it possible to guarantee ordered delivery with oneWay calls using namedPipe binding? I have a WCF service/client communicating using namedPipe binding. The client is exposing a callback contract in which all the methods in the callback are marked as OneWay. Something like this [ServiceContract(CallbackContract = typeof(IMyServiceCallback))] public interface IMyService { [OperationContract] void MyOperation(); } public interface IMyServiceCallback { [OperationContract(IsOneWay=true)] void MyCallback1(); [OperationContract(IsOneWay=true)] void MyCallback2(); } At the server side, the implementation of MyOperation method always calls MyCallback1 first and then MyCallback2 but I am observing that sometimes the client receives the calls in the incorrect order (MyCallback2 first and then MyCallback1). On searching the internet I found that the order is not guaranteed with oneway operation as mentioned here and also there is something called reliableSession which ensure message ordering. All the examples on the internet for reliable session are with TCP binding (and not a single one with NamedPipeBinding) and the tcpBinding also has a property called ReliableSession which is not present on the NetNamedPipeBinding. So I am not sure whether reliable session is expected to work with NetNamedPipeBinding or not. Question: Does reliable session work with namedPipeBinding? If yes, how? If no, Is there any other approach with which I can guarantee ordered delivery?

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