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  • Google App Engine, parsedatetime and TimeZones

    - by Ron
    Hey guys, I'm working on a Google App Engine / Django app and I encountered the following problem: In my html I have an input for time. The input is free text - the user types "in 1 hour" or "tomorrow at 11am". The text is then sent to the server in AJAX, which parses it using this python library: http://code.google.com/p/parsedatetime/. Once parsed, the server returns an epoch timestamp of the time. Here is the problem - Google App Engine always runs on UTC. Therefore, lets say that the local time is now 11am and the UTC time is 2am. When I send "now" to the server it will return "2am", which is good because I want the date to be received in UTC time. When I send "in 1 hour" the server will return "3am" which is good, again. However, when I send "at noon" the server will return "12pm" because it thinks that I'm talking about noon UTC - but really I need it to return 3am, which is noon for the request sender.. I can pass on the TZ of the browser that sends the request, but that wont really help me - the parsedatetime library wont take a timezone argument (correct me if I'm wrong). Is there a walk around this? Maybe setting the environments TZ somehow? Thanks!

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  • Advanced search engine or server for relational database [closed]

    - by Pawel
    In my current project we are storing big volume of data in relational database. One of the recent key requirements is to enrich application by adding some advanced search capabilities. In the Project, performance is one of the important factors due to very large tables (10+ milions of records) with parent-children relations (for example: multi-level parent-child relationship, where I am looking for all parents with specific children). The search engine should also be able to check these references for hits. I have found some potential engines on stack overflow, however it looks like that all of them are dedicated rather for text search than relational db and hosted on linux os: lucene Solr Sphinx As I understand some of them use documents as a source of searching, but is it possible or efficient to create programmaticaly documents based on my relational data? As I am not familiar with all of their features/capabilities can anyone please make some recommendations or propose some different solution? To summarize my requirements: framework/engine to search relational database including decendants. support for Microsoft SQL Server can be used in .NET applications preferably hosted on Windows systems Does any of mentioned above are able to solve my problem? do you know any better solution?

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  • Simple App Engine Sessions Implementation

    - by raz0r
    Here is a very basic class for handling sessions on App Engine: """Lightweight implementation of cookie-based sessions for Google App Engine. Classes: Session """ import os import random import Cookie from google.appengine.api import memcache _COOKIE_NAME = 'app-sid' _COOKIE_PATH = '/' _SESSION_EXPIRE_TIME = 180 * 60 class Session(object): """Cookie-based session implementation using Memcached.""" def __init__(self): self.sid = None self.key = None self.session = None cookie_str = os.environ.get('HTTP_COOKIE', '') self.cookie = Cookie.SimpleCookie() self.cookie.load(cookie_str) if self.cookie.get(_COOKIE_NAME): self.sid = self.cookie[_COOKIE_NAME].value self.key = 'session-' + self.sid self.session = memcache.get(self.key) if self.session: self._update_memcache() else: self.sid = str(random.random())[5:] + str(random.random())[5:] self.key = 'session-' + self.sid self.session = dict() memcache.add(self.key, self.session, _SESSION_EXPIRE_TIME) self.cookie[_COOKIE_NAME] = self.sid self.cookie[_COOKIE_NAME]['path'] = _COOKIE_PATH print self.cookie def __len__(self): return len(self.session) def __getitem__(self, key): if key in self.session: return self.session[key] raise KeyError(str(key)) def __setitem__(self, key, value): self.session[key] = value self._update_memcache() def __delitem__(self, key): if key in self.session: del self.session[key] self._update_memcache() return None raise KeyError(str(key)) def __contains__(self, item): try: i = self.__getitem__(item) except KeyError: return False return True def _update_memcache(self): memcache.replace(self.key, self.session, _SESSION_EXPIRE_TIME) I would like some advices on how to improve the code for better security. Note: In the production version it will also save a copy of the session in the datastore. Note': I know there are much more complete implementations available online though I would like to learn more about this subject so please don't answer the question with "use that" or "use the other" library.

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  • Loading child entities with JPA on Google App Engine

    - by Phil H
    I am not able to get child entities to load once they are persisted on Google App Engine. I am certain that they are saving because I can see them in the datastore. For example if I have the following two entities. public class Parent implements Serializable{ @Id @GeneratedValue(strategy = GenerationType.IDENTITY) @Extension(vendorName="datanucleus", key="gae.encoded-pk", value="true") private String key; @OneToMany(cascade=CascadeType.ALL) private List<Child> children = new ArrayList<Child>(); //getters and setters } public class Child implements Serializable{ @Id @GeneratedValue(strategy = GenerationType.IDENTITY) @Extension(vendorName="datanucleus", key="gae.encoded-pk", value="true") private String key; private String name; @ManyToOne private Parent parent; //getters and setters } I can save the parent and a child just fine using the following: Parent parent = new Parent(); Child child = new Child(); child.setName("Child Object"); parent.getChildren().add(child); em.persist(parent); However when I try to load the parent and then try to access the children (I know GAE lazy loads) I do not get the child records. //parent already successfully loaded parent.getChildren.size(); // this returns 0 I've looked at tutorial after tutorial and nothing has worked so far. I'm using version 1.3.3.1 of the SDK. I've seen the problem mentioned on various blogs and even the App Engine forums but the answer is always JDO related. Am I doing something wrong or has anyone else had this problem and solved it for JPA?

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  • Want to develop my own primitive physics engine, don't know how to start with it's high-level architecture. Suggestions?

    - by Violet Giraffe
    Few years ago I tried to make a simple 3D game - billiards. Completed like 50%, stuck with physics. Basically, I only need to calculate balls rolling over flat surface, but it would be nice to make something more flexible. I know all the formulas and laws (most of them, anyway). the problem is I have no idea of how to make good physics engine architecture-wise. I tried google and other forums but didn't find what I was looking for. The only suggestion was to look at open-source engine, but I'm not that good a programmer to make heads or tails out of it...

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  • route view problem

    - by Clear.Cache
    Trying to check IP status to show a customer root@server [~]# telnet route-views.routeviews.org Trying 128.223.51.103... Nothing happens, but telnet is enabled Any idea why it may hang for minutes? Using CSf firewall, Centos 4.4 box

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  • can we set up cron jobs in Google App Engine without using SDK???

    - by nok
    I downloaded java SDK from Google App Engine. I tried running appcfg.cmd from command prompt. But it gives this error. Error opening registry key 'Software\JavaSoft\Java Runtime Environment' Error: could not find java.dll Error: could not find Java 2 Runtime Environment. All i want to do with Google App Engine is to set up cron jobs with 1 minute frequency. I don't want to make any application in Google App Engine. I just want the cron job set up. Is there any way to set up cron job in Google App Engine without using the java SDK ???

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  • Do you know of any alternative to "Google App Engine"?

    - by brilliant
    On their presentation of "Google App Engine" Google team members boldly said: "You write a code and we will run it for you". Then the "Google App Engine" was launched and it still does its job quite successfully - "Google App Engine" runs millions of applications of different sizes belonging to different users completely free!!! Now, here is the question: Do You know of any alternative to GAE? Have You ever even heard of any such service out there that would run Your Python code for free?

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  • ASP.NET MVC 2 generation of the List/Index view

    - by Klas Mellbourn
    ASP.NET MVC 2 has powerful features for generating the model-dependent content of the Edit view (using EditorForModel) and Details view (using DisplayForModel) that automatically utilizes metadata and editor (or display) templates: <% using (Html.BeginForm()) {%> <%= Html.ValidationSummary(true) %> <fieldset> <legend><%= Html.LabelForModel() %></legend> <%= Html.EditorForModel() %> <p> <input type="submit" value="Save" /> </p> </fieldset> <% } %> However, I cannot find any comparable tools for the "last" step of generating the Index view (a.k.a. the List view). There I have to hard code the columns first in the row representing the headers and then inside the foreach loop: <h2>Index</h2> <table> <tr> <th></th> <th> ID </th> <th> Foo </th> <th> Bar </th> </tr> <% foreach (var item in Model) { %> <tr> <td> <%= Html.ActionLink("Edit", "Edit", new { id=item.ID }) %> | <%= Html.ActionLink("Details", "Details", new { id=item.ID })%> | <%= Html.ActionLink("Delete", "Delete", new { id=item.ID })%> </td> <td> <%= Html.Encode(item.ID) %> </td> <td> <%= Html.Encode(item.Foo) %> </td> <td> <%= Html.Encode(String.Format("{0:g}", item.Bar)) %> </td> </tr> <% } %> </table> What would be the best way to generate the columns (utlizing metadata such as HiddenInput), with the aim of making the Index view as free of model particulars as Edit and Details?

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  • DIY Homemade Hybrid Rocket Engine [Video]

    - by Jason Fitzpatrick
    Remember the guy with the cool DIY astronaut ice cream build? He’s back with a mini hybrid rocket engine that runs off oxygen and acrylic. I built a small rocket engine for demonstration purposes. The engine is built from a 2″ diameter acrylic rod through which I drilled a 0.5″ hole. The oxygen at 80 psi or less is passed through the hole and then is forced through a convergent-divergent nozzle at the tail end. The nozzle’s throat is about 0.25″ and expands to 0.625″. I lit the engine by inserting a burning cotton swab (with wooden stick) while a small amount of oxygen was flowing. The acrylic catches fire very easily in a pure oxygen environment. The engine can be throttled and shut off completely, which is a major benefit to hybrid engine designs. Solid-fuel rockets cannot be throttled or shut off, which makes them difficult to control. [via Make] HTG Explains: What is the Windows Page File and Should You Disable It? How To Get a Better Wireless Signal and Reduce Wireless Network Interference How To Troubleshoot Internet Connection Problems

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  • EF4: ObjectContext inconsistent when inserting into a view with triggers

    - by user613567
    I get an Invalid Operation Exception when inserting records in a View that uses “Instead of” triggers in SQL Server with ADO.NET Entity Framework 4. The error message says: {"The changes to the database were committed successfully, but an error occurred while updating the object context. The ObjectContext might be in an inconsistent state. Inner exception message: The key-value pairs that define an EntityKey cannot be null or empty. Parameter name: record"} @ at System.Data.Objects.ObjectContext.SaveChanges(SaveOptions options) at System.Data.Objects.ObjectContext.SaveChanges() In this simplified example I created two tables, Contacts and Employers, and one view Contacts_x_Employers which allows me to insert or retrieve rows into/from these two tables at once. The Tables only have a Name and an ID attributes and the view is based on a join of both: CREATE VIEW [dbo].[Contacts_x_Employers] AS SELECT dbo.Contacts.ContactName, dbo.Employers.EmployerName FROM dbo.Contacts INNER JOIN dbo.Employers ON dbo.Contacts.EmployerID = dbo.Employers.EmployerID And has this trigger: Create TRIGGER C_x_E_Inserts ON Contacts_x_Employers INSTEAD of INSERT AS BEGIN SET NOCOUNT ON; insert into Employers (EmployerName) select i.EmployerName from inserted i where not i.EmployerName in (select EmployerName from Employers) insert into Contacts (ContactName, EmployerID) select i.ContactName, e.EmployerID from inserted i inner join employers e on i.EmployerName = e.EmployerName; END GO The .NET Code follows: using (var Context = new TriggersTestEntities()) { Contacts_x_Employers CE1 = new Contacts_x_Employers(); CE1.ContactName = "J"; CE1.EmployerName = "T"; Contacts_x_Employers CE2 = new Contacts_x_Employers(); CE1.ContactName = "W"; CE1.EmployerName = "C"; Context.Contacts_x_Employers.AddObject(CE1); Context.Contacts_x_Employers.AddObject(CE2); Context.SaveChanges(); //? line with error } SSDL and CSDL (the view nodes): <EntityType Name="Contacts_x_Employers"> <Key> <PropertyRef Name="ContactName" /> <PropertyRef Name="EmployerName" /> </Key> <Property Name="ContactName" Type="varchar" Nullable="false" MaxLength="50" /> <Property Name="EmployerName" Type="varchar" Nullable="false" MaxLength="50" /> </EntityType> <EntityType Name="Contacts_x_Employers"> <Key> <PropertyRef Name="ContactName" /> <PropertyRef Name="EmployerName" /> </Key> <Property Name="ContactName" Type="String" Nullable="false" MaxLength="50" Unicode="false" FixedLength="false" /> <Property Name="EmployerName" Type="String" Nullable="false" MaxLength="50" Unicode="false" FixedLength="false" /> </EntityType> The Visual Studio solution and the SQL Scripts to re-create the whole application can be found in the TestViewTrggers.zip at ftp://JulioSantos.com/files/TriggerBug/. I appreciate any assistance that can be provided. I already spent days working on this problem.

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  • Effectively implementing a game view using java

    - by kdavis8
    I am writing a 2d game in java. The game mechanics are similar to the Pokémon game boy advance series e.g. fire red, ruby, diamond and so on. I need a way to draw a huge map maybe 5000 by 5000 pixels and then load individual in game sprites to across the entirety of the map, like rendering a scene. Game sprites would be things like terrain objects, trees, rocks, bushes, also houses, castles, NPC's and so on. But i also need to implement some kind of camera view class that focuses on the player. the camera view class needs to follow the characters movements throughout the game map but it also needs to clip the rest of the map away from the user's field of view, so that the user can only see the arbitrary proximity adjacent to the player's sprite. The proximity's range could be something like 500 pixels in every direction around the player’s sprite. On top of this, i need to implement an independent resolution for the game world so that the game view will be uniform on all screen sizes and screen resolutions. I know that this does sound like a handful and may fall under the category of multiple questions, but the questions are all related and any advice would be very much appreciated. I don’t need a full source code listing but maybe some pointers to effective java API classes that could make doing what i need to do a lot simpler. Also any algorithmic/ design advice would greatly benefit me as well. example of what i am trying to do in source code form below package myPackage; /** * The Purpose of GameView is to: Render a scene using Scene class, Create a * clipping pane using CameraView class, and finally instantiate a coordinate * grid using Path class. * * Once all of these things have been done, GameView class should then be * instantiated and used jointly with its helper classes. CameraView should be * used as the main drawing image. CameraView is the the window to the game * world.Scene passes data constantly to CameraView so that the entire map flows * smoothly. Path uses the x and y coordinates from camera view to construct * cells for path finding algorithms. */ public class GameView { // Scene is a helper class to game view. it renders the entire map to memory // for the camera view. Scene scene; // Camera View is a helper class to game view. It clips the Scene into a // small image that follows the players coordinates. CameraView Camera; // Path is a helper class to game view. It observes and calculates the // coordinates of camera view and divides them into Grids/Cells for Path // finding. Path path; // this represents the player and has a getSprite() method that will return // the current frame column row combination of the passed sprite sheet. Sprite player; }

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  • Could not import Django settings into Google App Engine

    - by gkelsall
    Hello all you Google App Engine experts, I have used Django a little before but am new to Google App Engine and am trying to use it's development web server with Django for the first time. I don't know if this is relevent but I previously had Django 1.1 and Python 2.6 on my Windows XP and even though I have uninstalled Python 2.6 there is still a folder and entries in the registry. I have followed the instructions from Google but when I browse to the GAE developemnt web server it cannot find my settings (details below). Any hints gratefully received. Regards Geoff C:\Documents and Settings\GeoffK\My Documents\ing\ingsite>echo %PATH% C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS \system32\WindowsPowerShell\v1.0;;C:\Python25;C:\Python25\Lib\site- packages\django\bin;C:\Documents and Settings\GeoffK\My Documents\ing \ingsite;C:\Program Files\Google\google_appengine\ C:\Documents and Settings\GeoffK\My Documents\ing\ingsite>echo %PYTHONPATH% C:\Documents and Settings\GeoffK\My Documents\ing\ingsite C:\Documents and Settings\GeoffK\My Documents\ing\ingsite>C:\Documents and Settings\GeoffK\My Documents\ing\ingsite>dev_appserver.py -- debug_imports ingiliz\ INFO 2009-08-04 07:29:45,328 appengine_rpc.py:157] Server: appengine.google. com INFO 2009-08-04 07:29:45,358 appcfg.py:322] Checking for updates to the SDK. INFO 2009-08-04 07:29:45,578 appcfg.py:336] The SDK is up to date. WARNING 2009-08-04 07:29:45,578 datastore_file_stub.py:404] Could not read data store data from c:\docume~1\geoffk\locals~1\temp \dev_appserver.datastore WARNING 2009-08-04 07:29:45,578 datastore_file_stub.py:404] Could not read data store data from c:\docume~1\geoffk\locals~1\temp \dev_appserver.datastore.history WARNING 2009-08-04 07:29:45,608 dev_appserver.py:3296] Could not initialize ima ges API; you are likely missing the Python "PIL" module. ImportError: No module named _imaging INFO 2009-08-04 07:29:45,625 dev_appserver_main.py:465] Running application ingiliz on port 8080: http://localhost:8080 ..... Now attempting to browse if need more detail here I can post ..... if not settings.DATABASE_ENGINE: File "C:\Python25\lib\site-packages\django\conf\__init__.py", line 28, in __ge tattr__ self._import_settings() File "C:\Python25\lib\site-packages\django\conf\__init__.py", line 59, in _imp ort_settings self._target = Settings(settings_module) File "C:\Python25\lib\site-packages\django\conf\__init__.py", line 94, in __in it__ raise ImportError, "Could not import settings '%s' (Is it on sys.path? Does it have syntax errors?): %s" % (self.SETTINGS_MODULE, e) ImportError: Could not import settings 'settings' (Is it on sys.path? Does it ha ve syntax errors?): No module named settings INFO 2009-08-04 07:31:02,187 dev_appserver.py:2982] "GET / HTTP/ 1.1" 500 -

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  • How does Google App Engine precompile Java ?

    - by Thilo
    App Engine uses a "precompilation" process with the Java bytecode of an app to enhance the performance of the app in the Java runtime environment. Precompiled code functions identically to the original bytecode. Is there any detailed information what this does?

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  • Google App Engine UI Widgets

    - by Carl
    Are there any UI widgets available to the python side of Google App Engine? I'd like something like the collapsed/expanded views of Google Groups threads. Are these type things limited to the GWT side?

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  • Extending Zend View Helper Placeholder

    - by Sonny
    I was reading the manual about basic placeholder usage, and it has this example: class Bootstrap extends Zend_Application_Bootstrap_Bootstrap { // ... protected function _initSidebar() { $this->bootstrap('View'); $view = $this->getResource('View'); $view->placeholder('sidebar') // "prefix" -> markup to emit once before all items in collection ->setPrefix("<div class=\"sidebar\">\n <div class=\"block\">\n") // "separator" -> markup to emit between items in a collection ->setSeparator("</div>\n <div class=\"block\">\n") // "postfix" -> markup to emit once after all items in a collection ->setPostfix("</div>\n</div>"); } // ... } I want to acommplish almost exactly that, but I'd like to conditionally add more class values to the repeating divs, at time of rendering if possible, when all the content is in the placeholder. One thing I specifically want to do is add the class of "first" to the first element and "last" to the last element. I assume that I'll have to extend the Zend_View_Helper_Placeholder class to accomplish this.

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  • How to add Custom View +Relative Layout into ViewGroup

    - by TimothyMiller
    Hi I am creating a View where you can draw on the screen, using a view, where I would like to have a button/titlebar drawn at the top of the screen. Here is my current code public class FingerPaint extends Activity implements ColorPickerDialog.OnColorChangedListener { private Paint mPaint; private MyView mView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); LinearLayout main = new LinearLayout(this); mView = new MyView(this); main.addView(this.getLayoutInflater().inflate( R.layout.topbar, null )); main.addView(mView); main.bringChildToFront(mView); setContentView(main); // mView.addView(this.getLayoutInflater().inflate( R.layout.topbar, null )); mPaint = new Paint(); mPaint.setAntiAlias(true); mPaint.setDither(true); mPaint.setColor(0xFFFF0000); mPaint.setStyle(Paint.Style.STROKE); mPaint.setStrokeJoin(Paint.Join.ROUND); mPaint.setStrokeCap(Paint.Cap.ROUND); mPaint.setStrokeWidth(12); mBitmaps=new Bitmap[100]; location=0; actualSize=0; mEmboss = new EmbossMaskFilter(new float[] { 1, 1, 1 }, 0.4f, 6, 3.5f); mBlur = new BlurMaskFilter(8, BlurMaskFilter.Blur.NORMAL); setContentView(main); } public class MyView extends View{ ......... } But when run, only the topbar.xml view is shown. I want the status bar from topbar and the rest down to be from the myView (for drawing on the screen like paint). Am I using ViewGroup properly?

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  • App engine index building stalled stuck

    - by Alexander
    Hi, I am having a problem with indexes building in my App Engine application. There are only about 200 entities in the indexes that are being built, and the process has now been running or over 24 hours. My application name is romanceapp. Is there any way that I can re-start or clear the indexes that are being built? Thank you and kind regards Alexander M.

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  • Document generation template engine for production usage NVelocity vs StringTemplate

    - by Chris Marisic
    For building a document generation engine what would be the primary .NET framework to be used in production. The 2 main ones I see are NVelocity and StringTemplate. NVelocity in all forks to be almost unsupported at this point where as ST been active atleast as of this year. Are either or both of these stable for use in production (if nv which fork)? Has anyone had any particularly good success with or failures using either of those frameworks?

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  • Recommendation for a Strategy Game Engine for .NET?

    - by Fred F.
    Can anyone recommend a strategy game engine for the .net framework. I downloaded XNA, but it is way beyond my needs. I just want to create a turn based strategy game. I have searched and searched, but all I cannnot find any examples. I have asked for something similiar before, but have not gotten any good answers.

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  • Unlimited Detail Graphics Engine

    - by daddz
    So I stumbled upon this "new" graphics engine/technology called Unlimited Detail. This seems to be pretty interesting granted it's real and not a fake. They have some videos explaining the technology but they only scratch the surface. What do you think about it? Is it programmatically possible? Or is it just a scam for investors?

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  • Bounced email on Google App Engine

    - by Ivan Vovnenko
    I'm developing application for google app engine (python), witch needs not only to send emails, but also know which ones bounce back. I created special account for my domain [email protected], added it as an app admin and sending messages from it. The problem is (and it was described here http://code.google.com/p/googleappengine/issues/detail?id=1800) - GAE sets the Return-Path to some internal email address, not allowing to receive bounced email messages. Anyone aware of any possible workaround for this? Thanks.

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