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• ArchBeat Link-o-Rama for 2012-09-07

  - by Bob Rhubart

  Oracle Technology Network Architect Day - Boston, MA - 9/12/2012 Sure, you could ask a voodoo priestess for help in improving your solution architecture skills. But there's the whole snake thing, and the zombie thing, and other complications. So why not keep it simple and register for Oracle Technology Network Architect Day in Boston, MA. There's no magic, just a full day of technical sessions covering Cloud, SOA, Engineered Systems, and more. Registration is free. Wednesday September 12, 2012 8:00 a.m. – 5:00 p.m. Boston Marriott Burlington, One Burlington Mall Road, Burlington, MA 01803 Attend OTN Architect Day in Los Angeles – by Architects, for Architects – October 25 The OTN Architect Day roadshow stops in Boston next week, then it's on to Los Angeles for another all architecture, all day event on Thursday October 25, 2012 at the Sofitel Los Angeles, 555 Beverly Boulevard, Los Angeles, CA 90048. Like all Architect Day events, this one is absolutley free, so register now. Webcast: Oracle WebCenter in Action: Hitachi Data Systems Catch this live webcast on Thursday, September 13, 2012 (10am PT / 1pm ET) to learn from speakers from Hitachi Data Systems, LingoTek, and Oracle about how Hitachi used Oracle WebCenter to improve the web experience for its international customers. Article Index: Architect Community Column in Oracle Magazine Did you know that Oracle Magazine features a regular column devoted specifically to the architect community? Every column includes insight and expertise from architects who regularly deal with the issues architects face. Click here to see a complete list of articles. ADF EMG Sunday at OOW 2012 (30. Sep 2012) - A day full of content | Frank Nimphius Frank Nimphius's shares details on Chris Muir's ADF EMG series of sessions during User Group Sunday at OOW, Sept 30, in Moscone West room 305. The Role of Oracle VM Server for SPARC in a Virtualization Strategy New OTN article from Matthias Pfützner. Countdown to Oracle OpenWorld 2012 | Oracle WebCenter Blog A helpful list of OOW sessions focused on Oracle WebCenter. Oracle Exalogic X2-2 walkthrough | Jan van Zoggel "For those of us not lucky enough to have one at home," Jan van Zoggel recommends this "very cool" video featuring "a detailed walkthrough explaining each component of a Oracle Exalogic X2-2 machine," presented by Oracle Exalogic VP Development Brad Cameron. September OTN Member Offers | OTN Blog Save big on books from top tech publishers with these discounts for OTN members. Thought for the Day "Only Robinson Crusoe had everything done by Friday." — Unknown Source: Quote Garden

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• Simulating smooth movement along a line after calculating a collision containing a restitution of zero in 2D

  - by Casey

  [for tl;dr see after listing] //...Code to determine shapes types involved in collision here... //...Rectangle-Line collision detected. if(_rbTest->GetCollisionShape()->Intersects(*_ground->GetCollisionShape())) { //Convert incoming shape to a line. a2de::Line l(*dynamic_cast<a2de::Line*>(_ground->GetCollisionShape())); //Get line's normal. a2de::Vector2D normal_vector(l.GetSlope().GetY(), -l.GetSlope().GetX()); a2de::Vector2D::Normalize(normal_vector); //Accumulate forces involved. a2de::Vector2D intermediate_forces; a2de::Vector2D normal_force = normal_vector * _rbTest->GetMass() * _world->GetGravityHandler()->GetGravityValue(); intermediate_forces += normal_force; //Calculate final velocity: See [1] double Ma = _rbTest->GetMass(); a2de::Vector2D Ua = _rbTest->GetVelocity(); double Mb = _ground->GetMass(); a2de::Vector2D Ub = _ground->GetVelocity(); double mCr = Mb * _ground->GetRestitution(); a2de::Vector2D collision_velocity( ((Ma * Ua) + (Mb * Ub) + ((mCr * Ub) - (mCr * Ua))) / (Ma + Mb)); //Calculate reflection vector: See [2] a2de::Vector2D reflect_velocity( -collision_velocity + 2 * (a2de::Vector2D::DotProduct(collision_velocity, normal_vector)) * normal_vector ); //Affect velocity to account for restitution of colliding bodies. reflect_velocity *= (_ground->GetRestitution() * _rbTest->GetRestitution()); _rbTest->SetVelocity(reflect_velocity); //THE ULTIMATE ISSUE STEMS FROM THE FOLLOWING LINE: //Move object away from collision one pixel to prevent constant collision. _rbTest->SetPosition(_rbTest->GetPosition() + normal_vector); _rbTest->ApplyImpulse(intermediate_forces); } Sources: (1) Wikipedia: Coefficient of Restitution: Speeds after impact (2) Wikipedia: Specular Reflection: Direction of reflection First, I have a system in place to account for friction (that is, a coefficient of friction) but is not used right now (in addition, it is zero, which should not affect the math anyway). I'll deal with that after I get this working. Anyway, when the restitution of either object involved in the collision is zero the object stops as required, but if movement along the same direction (again, irrespective of the friction value that isn't used) as the line is attempted the object moves as if slogging through knee deep snow. If I remove the line of code in question and the object is not push away one pixel the object barely moves at all. All because the object collides, is stopped, is pushed up, collides, is stopped...etc. OR collides, is stopped, collides, is stopped, etc... TL;DR How do I only account for a collision ONCE for restitution purposes (BONUS: but CONTINUALLY for frictional purposes, to be implemented later)

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• Weblogic Bea 10.0 M1 and WorkManager

  - by ma-ver-ick

  Hi there! I have to execute long running threads in a WebLogic Bea 10.0 M1 server environment. I tried to use WorkManagers for this. Using an own WorkManager allows me to specify my own thread timeout (MaxThreadStuckTime) instead of adjusting the timeout for the whole business application. My setup is as follows: weblogic-ejb-jar.xml: <?xml version="1.0" encoding="UTF-8"?> <weblogic-ejb-jar xmlns="http://www.bea.com/ns/weblogic/90" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.bea.com/ns/weblogic/90 http://www.bea.com/ns/weblogic/90/weblogic-ejb-jar.xsd"> <weblogic-enterprise-bean> <ejb-name>TestBean</ejb-name> <resource-description> <res-ref-name>myWorkManager</res-ref-name> <jndi-name>wm/myWorkManager</jndi-name> </resource-description> </weblogic-enterprise-bean> </weblogic-ejb-jar> weblogic-application.xml: <?xml version="1.0" encoding="UTF-8"?> <weblogic xmlns="http://www.bea.com/ns/weblogic/90" xmlns:j2ee="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.bea.com/ns/weblogic/90 http://www.bea.com/ns/weblogic/90/weblogic.xsd"> <work-manager> <name>myWorkManager</name> <ignore-stuck-threads>1</ignore-stuck-threads> </work-manager> </weblogic> and the Bean: import javax.annotation.Resource; import javax.ejb.Stateful; import weblogic.work.WorkManager; @Stateful(mappedName = "TestBean") public class TestBean implements TestBeanRemote { @Resource(name = "myWorkManager") private WorkManager myWorkManager; public void test() { myWorkManager.schedule(new Runnable() { public void run() { while (true) { System.out.println("test: +++++++++++++++++++++++++"); try { Thread.sleep(45000); } catch (InterruptedException e) { e.printStackTrace(); } } } }); } } When I try to deploy this things, the server gives me the following exceptions: [EJB:011026]The EJB container failed while creating the java:/comp/env namespace for this EJB deployment. weblogic.deployment.EnvironmentException: [EJB:010176]The resource-env-ref 'myWorkManager' declared in the ejb-jar.xml descriptor has no JNDI name mapped to it. The resource-ref must be mapped to a JNDI name using the resource-description element of the weblogic-ejb-jar.xml descriptor. I try to figure out how to access / use WorkMangers for days now, and still get this or that as an exception. Very frustrating! Thanks in advance!

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• Need Java Swing HTML canvas with support for integrated swing controls

  - by Iggy Ma

  I would like to create an application in swing in the style of web 2.0 but have the power and functionality of a thick client. I know substance and some other look and feels help with this some, but I was wondering if there is a way I can actually use some kind of html panel / canvas to create the content in html, embedding swing controls in the rendering so as to still use listeners and get the functionality. Anybody know of a way to do this?

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• Code golf: find all anagrams

  - by Charles Ma

  An word is an anagram if the letters in that word can be re-arranged to form a different word. Task: Find all sets of anagrams given a word list Input: a list of words from stdin with each word separated by a new line e.g. A A's AOL AOL's Aachen Aachen's Aaliyah Aaliyah's Aaron Aaron's Abbas Abbasid Abbasid's Output: All sets of anagrams, with each set separated by a separate line Example run: ./anagram < words marcos caroms macros lump's plum's dewar's wader's postman tampons dent tend macho mocha stoker's stroke's hops posh shop chasity scythia ... I have a 149 char perl solution which I'll post as soon as a few more people post :) Have fun!

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• svn diff: file marked as binary type

  - by Charles Ma

  I'm doing an svn diff on one of my files and svn is detecting it as a binary type. The file is readable plain text and I would like to be able to get a diff of this file. How do I tell SVN that this is not a binary file? Cannot display: file marked as a binary type. svn:mime-type = application/octet-stream

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• oracle's pro*C compiler and gnu C (__builtin_va_list, __attribute__, etc)

  - by Charles Ma

  I'm compiling a database library with pro*C which converts the .ppc library file to a .c file that gcc can use. However, I'm getting a lot of errors in pro*C like the following PCC-S-02201, Encountered the symbol "__ attribute__ " when expecting one of the following ... , Encountered the symbol "__builtin_va_list" when expecting one of the following The missing symbols are from a chain of standard includes like stdio.h and stdlib.h. How do I get around this issue? The library I'm compiling came from an old solaris system that we're now upgrading (to a new solaris 10 system) and the header files don't seem to use these symbols. e.g. the newer .h files has typedef __builtin_va_list va_list while the old .h files has typedef void* va_list There are a lot of things like this so I'm reluctant to go and fix all of them manually with a typedef

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• How can I force mod_perl to only allow one process per connection?

  - by Charles Ma

  I have a perl cgi script that's fairly resource intensive (takes about 2 seconds to finish). This is fine as long as only at most 4 or 5 of them are running at the same time and that's usually the case. The problem is that when a user clicks a link that calls this script, a new process is spawned to handle that connection request, so if a user clicks many times (if they're impatient), the server gets overloaded with new processes running and most of them are redundant. How can I ensure that only one instance of this process is running per host? This is an old system that I'm maintaining which uses an old framework for the frontend, and I would like to avoid using javascript to disable the button client side if possible. Converting this to fast-cgi perl is out of the question as well, again because this is an old system and adding fast-cgi to apache might break a lot of other things that this thing runs.

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• Custom Event - invokation list implementation considerations

  - by M.A. Hanin

  I'm looking for some pointers on implementing Custom Events in VB.NET (Visual Studio 2008, .NET 3.5). I know that "regular" (non-custom) Events are actually Delegates, so I was thinking of using Delegates when implementing a Custom Event. On the other hand, Andrew Troelsen's "Pro VB 2008 and the .NET 3.5 Platform" book uses Collection types in all his Custom Events examples, and Microsoft's sample codes match that line of thought. So my question is: what considerations should I have when choosing one design over the other? What are the pros and cons for each design? Which of these resembles the inner-implementation of "regular" events? Below is a sample code demonstrating the two designs. Public Class SomeClass Private _SomeEventListeners As EventHandler Public Custom Event SomeEvent As EventHandler AddHandler(ByVal value As EventHandler) _SomeEventListeners = [Delegate].Combine(_SomeEventListeners, value) End AddHandler RemoveHandler(ByVal value As EventHandler) _SomeEventListeners = [Delegate].Remove(_SomeEventListeners, value) End RemoveHandler RaiseEvent(ByVal sender As Object, ByVal e As System.EventArgs) _SomeEventListeners.Invoke(sender, e) End RaiseEvent End Event Private _OtherEventListeners As New List(Of EventHandler) Public Custom Event OtherEvent As EventHandler AddHandler(ByVal value As EventHandler) _OtherEventListeners.Add(value) End AddHandler RemoveHandler(ByVal value As EventHandler) _OtherEventListeners.Remove(value) End RemoveHandler RaiseEvent(ByVal sender As Object, ByVal e As System.EventArgs) For Each handler In _OtherEventListeners handler(sender, e) Next End RaiseEvent End Event End Class

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• django-admin formfield_for_* change default value per/depending on instance

  - by Nick Ma.

  Hi, I'm trying to change the default value of a foreignkey-formfield to set a Value of an other model depending on the logged in user. But I'm racking my brain on it... This: Changing ForeignKey’s defaults in admin site would an option to change the empty_label, but I need the default_value. #Now I tried the following without errors but it didn't had the desired effect: class EmployeeAdmin(admin.ModelAdmin): ... def formfield_for_foreignkey(self, db_field, request=None, **kwargs): formfields= super(EmployeeAdmin, self).formfield_for_foreignkey(db_field, request, **kwargs) if request.user.is_superuser: return formfields if db_field.name == "company": #This is the RELEVANT LINE kwargs["initial"] = request.user.default_company return db_field.formfield(**kwargs) admin.site.register(Employee, EmployeeAdmin) ################################################################## # REMAINING Setups if someone would like to know it but i think # irrelevant concerning the problem ################################################################## from django.contrib.auth.models import User, UserManager class CompanyUser(User): ... objects = UserManager() company = models.ManyToManyField(Company) default_company= models.ForeignKey(Company, related_name='default_company') #I registered the CompanyUser instead of the standard User, # thats all up and working ... class Employee(models.Model): company = models.ForeignKey(Company) ... Hint: kwargs["default"] ... doesn't exist. Thanks in advance, Nick

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• Integrating a Custom Compiler with the Visual Studio IDE

  - by M.A. Hanin

  Background: I want to create a custom VB compiler, extending the "original" compiler, to handle my custom compile-time attributes. Question: after I've created my custom compiler and I've got an executable file capable of compiling VB code via the standard command-line interface, how do I integrate this compiler with the Visual Studio IDE? (such that pressing "compile" or "build" will make use of my compiler instead of the default compiler). EDIT: (Correct me if i'm wrong) From the reactions here, I see this question is a bit shocking, so I shall further explain my needs and background: .NET provides us with a great mechanism called Attributes. As far as I understand, making attributes apply their intended behavior upon the attributed element (assembly, module, class, method, etc.) - attributes must be reflected upon. So the real trick here is reflecting and applying behavior at the right spot. Lets take Serialization for example: We decorate a class with the Serializable attribute. We then pass an instance of the class to the formatter's Serialize method. The formatter reflects upon the instance, checking if it has the Serializable attribute, and acting accordingly. Now, if we examine the Synchronization, Flags, Obsolete and CLSCompliant attributes, then the real question is: who reflects upon them? At least in some cases, it has to be the compiler (and/or IDE). Therefore, it seems that if I wish to create custom attributes that change an element's behavior regardless of any specific consumer, i must extend the compiler to reflect upon them at compilation. Of course, these are not my personal insights: the book "Applied .NET Attributes" provides a complete example of creating a custom attribute and a custom C# compiler to reflect upon that attribute at compilation (the example is used to implement "java-style checked exceptions").

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• Splitting assemblies - finding the balance (avoiding overkill)

  - by M.A. Hanin

  I'm writing a wide component infrastructure, to be used in my projects. Since not all projects will require every component created, I've been thinking of splitting the component into discrete assemblies, so that every application developed will only be deployed with the required assemblies. I assume that creating an assembly has some storage overhead (the assembly's code, wrapping whatever is inside). Therefore, there must be some limit to the advantage gained by splitting an assembly - a certain point where splitting the assembly is worse than keeping it united (storage-wise and performance-wise). Now, here is the question: how do I know when splitting an assembly is an overkill? P.S I guess there are other overheads to assembly splitting, aside from the storage overhead. If anyone can point out these overheads, it would be much appreciated.

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• .net mvc pass dictionary data from view to controller

  - by Wei Ma

  A while ago, I was trying to pass a dictionary data from my view to my controller. And I was able to do so after googling on the net(remember it was one of scott hanselman's posts). The solution I had was something like <%for(int index=0; index<Model.Count(); index++){ var property= Model.ElementAt(index);%> <input type="hidden" name="<%="properties["+index+"].Key"%>"/> <input type="hidden" name="<%="properties["+index+"].Value"%>"/> <%}%> public ActionResult Process(IDictionary<string,string> properties) { doSomething(); return View(); } The code worked for awhile and then I did some refactoring and got rid of this chunk of code. Today, I ran into a situation in which I would like to pass a dictionary again. But no matter how hard I try, the properties parameter received by the action was always null. I tried the above code and <%for(int index=0; index<Model.Count(); index++){ var property= Model.ElementAt(index);%> <input type="hidden" name="<%="properties.Keys["+index+"]"%>"/> <input type="hidden" name="<%="properties.Values["+index+"]"%>"/> <%}%> Neither code worked. I googled again but couldn't find the post that helped me before. Can someone point out what I did wrong? thanks a million.

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• Delegates and ParamArray - Workaround Suggestions?

  - by M.A. Hanin

  Some predefined methods contain a ParamArray in their signature. Delegates, however, cannot contain a ParamArray in their signature. Main question: Assume you wish to create a delegation mechanism for a specific method which requires a ParamArray. How would you work around this constraint? "Bonus" question: Assume you wish to create a generalized delegation mechanism for all methods which require ParamArray, how would you do that?

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• Android: handle unexpected internet disconnect while downloading data

  - by M.A. Cape

  Hi, I have here a function that downloads data from a remote server to file. I am still not confident with my code. My question is, what if while reading the stream and saving the data to a file and suddenly I was disconnected in the internet, will these catch exceptions below can really catch that kind of incident? If not, can you suggest how to handle this kind of incident? Note: I call this function in a thread so that the UI won't be blocked. public static boolean getFromRemote(String link, String fileName, Context context){ boolean dataReceived = false; ConnectivityManager connec = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE); if (connec.getNetworkInfo(0).isConnected() || connec.getNetworkInfo(1).isConnected()){ try { HttpClient httpClient = new DefaultHttpClient(); HttpGet httpGet = new HttpGet(link); HttpParams params = httpClient.getParams(); HttpConnectionParams.setConnectionTimeout(params, 30000); HttpConnectionParams.setSoTimeout(params, 30000); HttpResponse response; response = httpClient.execute(httpGet); int statusCode = response.getStatusLine().getStatusCode(); if (statusCode == 200){ HttpEntity entity = response.getEntity(); InputStream in = null; OutputStream output = null; try{ in = entity.getContent(); String secondLevelCacheDir = context.getCacheDir() + fileName; File imageFile = new File(secondLevelCacheDir); output= new FileOutputStream(imageFile); IOUtilities.copy(in, output); output.flush(); } catch (IOException e) { Log.e("SAVING", "Could not load xml", e); } finally { IOUtilities.closeStream(in); IOUtilities.closeStream(output); dataReceived = true; } } }catch (SocketTimeoutException e){ //Handle not connecting to client !!!! Log.d("SocketTimeoutException Thrown", e.toString()); dataReceived = false; } catch (ClientProtocolException e) { //Handle not connecting to client !!!! Log.d("ClientProtocolException Thrown", e.toString()); dataReceived = false; }catch (MalformedURLException e) { // TODO Auto-generated catch block e.printStackTrace(); dataReceived = false; Log.d("MalformedURLException Thrown", e.toString()); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); dataReceived = false; Log.d("IOException Thrown", e.toString()); } } return dataReceived; }

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• About Data Objects and DAO Design when using Hibernate

  - by X. Ma

  I'm hesitating between two designs of a database project using Hibernate. Design #1. (1) Create a general data provider interface, including a set of DAO interfaces and general data container classes. It hides the underneath implementation. A data provider implementation could access data in database, or an XML file, or a service, or something else. The user of a data provider does not to know about it. (2) Create a database library with Hibernate. This library implements the data provider interface in (1). The bad thing about Design #1 is that in order to hide the implementation details, I need to create two sets of data container classes. One in the general data provider interface - let's call them DPI-Objects, the other set is used in the database library, exclusively for entity/attribute mapping in Hibernate - let's call them H-Objects. In the DAO implementation, I need to read data from database to create H-Objects (via Hibernate) and then convert H-Objects into DPI-Objects. Design #2. Do not create a general data provider interface. Expose H-Objects directly to components that use the database lib. So the user of the database library needs to be aware of Hibernate. I like design #1 more, but I don't want to create two sets of data container classes. Is that the right way to hide H-Objects and other Hibernate implementation details from the user who uses the database-based data provider? Are there any drawbacks of Design #2? I will not implement other data provider in the new future, so should I just forget about the data provider interface and use Design #2? What do you think about this? Thanks for your time!

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• Why does Git.pm on cygwin complain about 'Out of memory during "large" request?

  - by Charles Ma

  Hi, I'm getting this error while doing a git svn rebase in cygwin Out of memory during "large" request for 268439552 bytes, total sbrk() is 140652544 bytes at /usr/lib/perl5/site_perl/Git.pm line 898, <GEN1> line 3. 268439552 is 256MB. Cygwin's maxium memory size is set to 1024MB so I'm guessing that it has a different maximum memory size for perl? How can I increase the maximum memory size that perl programs can use? update: This is where the error occurs (in Git.pm): while (1) { my $bytesLeft = $size - $bytesRead; last unless $bytesLeft; my $bytesToRead = $bytesLeft < 1024 ? $bytesLeft : 1024; my $read = read($in, $blob, $bytesToRead, $bytesRead); //line 898 unless (defined($read)) { $self->_close_cat_blob(); throw Error::Simple("in pipe went bad"); } $bytesRead += $read; } I've added a print before line 898 to print out $bytesToRead and $bytesRead and the result was 1024 for $bytesToRead, and 134220800 for $bytesRead, so it's reading 1024 bytes at a time and it has already read 128MB. Perl's 'read' function must be out of memory and is trying to request for double it's memory size...is there a way to specify how much memory to request? or is that implementation dependent? UPDATE2: While testing memory allocation in cygwin: This C program's output was 1536MB int main() { unsigned int bit=0x40000000, sum=0; char *x; while (bit > 4096) { x = malloc(bit); if (x) sum += bit; bit >>= 1; } printf("%08x bytes (%.1fMb)\n", sum, sum/1024.0/1024.0); return 0; } While this perl program crashed if the file size is greater than 384MB (but succeeded if the file size was less). open(F, "<400") or die("can't read\n"); $size = -s "400"; $read = read(F, $s, $size); The error is similar Out of memory during "large" request for 536875008 bytes, total sbrk() is 217088 bytes at mem.pl line 6.

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• Preserve data in .net mvc

  - by Wei Ma

  I am implementing a search module with result page support paging. The example provided by NerdDinner passes pagenumber as a parameter for the Index action, and the action uses the pagenumber to perform a query each time the user hit a different page number. My problem is that my search take many more criteria such as price, material, model number etc. than just simple pagenumber. Therefore, I would like to preserve the criteria after users' first submission, so that I only have to pass the pagenumber back and forth. Using ViewData is not possible because ViewData get cleared once it is sent to the View. Is there any good way to preserve the criteria data as I wish?

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• Should non-English member names be changed to English?

  - by M.A. Hanin

  Situation: Automatically generated memebers, such as MenuStrip items, have their (automatically generated) names based on the text entered when the item was created. My most common situation is creating a menu-strip and adding menu-items by entering their text (using the graphical designer). Since my GUI is in Hebrew, all these members have a name which contains a Hebrew string. Something like "(hebrew-text)ToolStripItem". When I create event handlers, the event handlers "inherit" the hebrew text: "(hebrew-text)ToolStripMenuItem_Click". This actually works well, IntelliSense has no problem with Hebrew text, and so does the compiler. The question is: should I change these names (or prevent them from being created in the first place)? What are the possible consequences of keeping those names?

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• Limit size of cache directory.

  - by M.A. Cape

  I have some questions about the cache directory in android. Does anyone knows the limit for each app's cache directory? Also what will happen if there is not enough disk space to cache data? All I know is when the device runs low on storage, the files here (cache directory)will be the ones that get deleted first and each app has its own cache directory. Now, are the files of other app's cache directory will be cleared to accommodate my app's request to add files in the cache dir when there is not enough storage?

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• C# Multi-Comparisons possible?

  - by Iggy Ma

  is it possible in some way to compare multiple variables to one constant in a if statement? It would be very helpful if instead of if ( col.Name != "Organization" && col.Name != "Contacts" && col.Name != "Orders" ) { } I could just say if ( col.Name != "Organization" || "Contacts" || "Orders" ) { } And I know I could use a list but in some instances I dont want to... Thanks!

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• how to use PreferenceActivity to modify DefaultSharedPreference in a native way?

  - by Alvin Ma

  ok... I need to put preferences from DefaultSharedPreference to PreferenceScreen in a PreferenceActivity....any native way for doing that? if not any easy and efficient way?

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• How to get all the descendants of a given instance of a model in google app engine?

  - by M.A. Cape

  Using parent child relationship where a parent can have children while each child has only one parent, does using Children.all().ancestor(parent.key) a good solution where a child is constructed by setting parent=parent.key in the constructor? Is the 1000 limit applies with this kind of query?

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• Appengine JDO dataclasses to python model

  - by M.A. Cape

  Does anyone have tried to implement an app in GAE having both java and python? I have an existing app and my front end is in java. Now I want to use the existing datastore to be interfaced by python. My problem is i don't know how to define the relationships and model that would be equivalent to the one in java. I have tried the one-to-many relationship in python but when stored in the datastore, the fields are different than the one-to-many of java. My data classes are as follows. //one-to-many owned Parent Class public class Parent{ @PrimaryKey @Persistent private String unitID; //some other fields... @Persistent @Order(extensions = @Extension(vendorName="datanucleus", key="list-ordering", value="dateCreated desc")) private List <Child> child; //methods & constructors were omitted } Child public class Child{ @PrimaryKey @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY) private Key uId; @Persistent private String name; /* etc... */ }

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• What does ancestor mean in the google app engine datastore.

  - by M.A. Cape

  Can anyone tell or define more what is "ancestor" and give an example on it and also what it is for? I just can't grasp what it really is. Reference: http://code.google.com/appengine/docs/python/datastore/queryclass.html#Query_ancestor Thanks.

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