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  • Class instance clustering in object reference graph for multi-entries serialization

    - by Juh_
    My question is on the best way to cluster a graph of class instances (i.e. objects, the graph nodes) linked by object references (the -directed- edges of the graph) around specifically marked objects. To explain better my question, let me explain my motivation: I currently use a moderately complex system to serialize the data used in my projects: "marked" objects have a specific attributes which stores a "saving entry": the path to an associated file on disc (but it could be done for any storage type providing the suitable interface) Those object can then be serialized automatically (eg: obj.save()) The serialization of a marked object 'a' contains implicitly all objects 'b' for which 'a' has a reference to, directly s.t: a.b = b, or indirectly s.t.: a.c.b = b for some object 'c' This is very simple and basically define specific storage entries to specific objects. I have then "container" type objects that: can be serialized similarly (in fact their are or can-be "marked") they don't serialize in their storage entries the "marked" objects (with direct reference): if a and a.b are both marked, a.save() calls b.save() and stores a.b = storage_entry(b) So, if I serialize 'a', it will serialize automatically all objects that can be reached from 'a' through the object reference graph, possibly in multiples entries. That is what I want, and is usually provides the functionalities I need. However, it is very ad-hoc and there are some structural limitations to this approach: the multi-entry saving can only works through direct connections in "container" objects, and there are situations with undefined behavior such as if two "marked" objects 'a'and 'b' both have a reference to an unmarked object 'c'. In this case my system will stores 'c' in both 'a' and 'b' making an implicit copy which not only double the storage size, but also change the object reference graph after re-loading. I am thinking of generalizing the process. Apart for the practical questions on implementation (I am coding in python, and use Pickle to serialize my objects), there is a general question on the way to attach (cluster) unmarked objects to marked ones. So, my questions are: What are the important issues that should be considered? Basically why not just use any graph parsing algorithm with the "attach to last marked node" behavior. Is there any work done on this problem, practical or theoretical, that I should be aware of? Note: I added the tag graph-database because I think the answer might come from that fields, even if the question is not.

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  • Storing application preferences and data

    - by Rudi Strydom
    I am looking at creating some Ubuntu applications, but finding good resoures are hard. I am using the quickly toolkit, but would really like some more insight. How does one normally store application preferences and settings in Linux / Ubuntu. Is it as simple as creating a XML file and saving the information and then reading from said file on application bootstrap? If someone can point me in a direction it would be greatly appreciated.

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  • A sample Memento pattern: Is it correct?

    - by TheSilverBullet
    Following this query on memento pattern, I have tried to put my understanding to test. Memento pattern stands for three things: Saving state of the "memento" object for its successful retrieval Saving carefully each valid "state" of the memento Encapsulating the saved states from the change inducer so that each state remains unaltered Have I achieved these three with my design? Problem This is a zero player game where the program is initialized with a particular set up of chess pawns - the knight and queen. Then program then needs to keep adding set of pawns or knights and queens so that each pawn is "safe" for the next one move of every other pawn. The condition is that either both pawns should be placed, or none of them should be placed. The chessboard with the most number of non conflicting knights and queens should be returned. Implementation I have 4 classes for this: protected ChessBoard (the Memento) private int [][] ChessBoard; public void ChessBoard(); protected void SetChessBoard(); protected void GetChessBoard(int); public Pawn This is not related to memento. It holds info about the pawns public enum PawnType: int { Empty = 0, Queen = 1, Knight = 2, } //This returns a value that shown if the pawn can be placed safely public bool IsSafeToAddPawn(PawnType); public CareTaker This corresponds to caretaker of memento This is a double dimentional integer array that keeps a track of all states. The reason for having 2D array is to keep track of how many states are stored and which state is currently active. An example: 0 -2 1 -1 2 0 - This is current state. With second index 0/ 3 1 - This state has been saved, but has been undone private int [][]State; private ChessBoard [] MChessBoard; //This gets the chessboard at the position requested and assigns it to originator public ChessBoard GetChessBoard(int); //This overwrites the chessboard at given position public void SetChessBoard(ChessBoard, int); private int [][]State; public PlayGame (This is the originator) private bool status; private ChessBoard oChessBoard; //This sets the state of chessboard at position specified public SetChessBoard(ChessBoard, int); //This gets the state of chessboard at position specified public ChessBoard GetChessBoard(int); //This function tries to place both the pawns and returns the status of this attempt public bool PlacePawns(Pawn);

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  • Red Gate Software announces speaker line up for US SQL in the City tour

    SQL in the City is a free, full day training and networking event for database professionals. After the success of last year’s event, Red Gate has expanded the event to cover six cities from sea to shining sea, including: New York, Austin, San Francisco, Chicago, Boston, and Seattle. Compress live data by 73% Red Gate's SQL Storage Compress reduces the size of live SQL Server databases, saving you disk space and storage costs. Learn more.

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  • wordpress is truncating and replacing category name and description in version 2.7.1 [migrated]

    - by Jayapal Chandran
    version: WordPress 2.7.1 I recently created a new category in a blog by wordpress. I created a long category name like win32 api programming and the description as windows api programming and win23api programming. But after saving it the name and the description changes to name: win32 api instead of win32 api programming and desc: Win32 api snippets I don't want to upgrade my wordpress because i dont like some new features in the new releases. what should i do to get my actual strings(names) intact?

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  • Google I/O 2012 - How to Build Apps that Love Each Other with Web Intents

    Google I/O 2012 - How to Build Apps that Love Each Other with Web Intents Paul Kinlan, James Hawkins Web Intents allows you to build applications that integrate with one another with an ease that has never been seen on the web before. In this session we will show you how to connect applications using Web Intents and how to best integrate with the many actions available in Web Intents such as editing, saving and sharing. For all I/O 2012 sessions, go to developers.google.com From: GoogleDevelopers Views: 1394 15 ratings Time: 57:48 More in Science & Technology

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  • What kind of innovative non-cash financial benefits do I offer to my developers to retain them along with a competitive salary?

    - by Fanatic23
    Stock options don't make much sense, since the company's private. [It still does, if you are a facebook of sorts AND the regulatory system permits sites like secondmarket, but I digress.] I could think of some: Health benefits to parents and parents-in-laws Sponsoring a fuel-saving bike to drive to office Gift cards for occasions like completion of 1, 3, 5 years of service I really could do with more suggestions here. Appreciate 1 response per entry for ease of up-voting.

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  • Database Security Puzzle Solving with IBM DB2 LUW Roles

    The task of keeping up with database security can sometimes be monumental! A major challenge when it comes to administering authorities and privileges is how to approach this puzzle in a sensible, time-saving, 'security robust' manner. There is no need for concern; we have a hint or two that will help solve this puzzler.

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  • Replicate a system as is

    - by Sarvesh Lad
    How do i repliacate a system as is. i have installed ubuntu from the minimal iso... i have kept it to minimum now i m using UCK to customise a live cd is there anyway i can replicate my installed system as is? i.e. install apps that i have install and remove apps that i have not installed/removed i tried using synaptics and saving the marking full state way and when i read it when customizing, it doesnt remove the apps that i have removed it just reads installs more apps, it doesnt remove

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  • Working with SQL Server Profiler Trace Files

    In a previous tip we looked at the steps to Create a Trace Template in Profiler. In this tip we will look at a few more tips such as creating a trace template from an existing trace file and saving a trace file to a SQL Server table. Free trial of SQL Backup™“SQL Backup was able to cut down my backup time significantly AND achieved a 90% compression at the same time!” Joe Cheng. Download a free trial now.

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  • 5 Reasons to Use An Instant Site Creator to Build Your Websites

    An Instant Site Creator is a piece of software that will allow you to create an unlimited number of websites with just a few mouse clicks. You can put up a new, professional looking site in minutes instead of hours or days, saving you both time and money. Here are five reasons you might want to use an instant site creator, or website builder software, instead of outsourcing the project or spending long hours doing it yourself

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  • Best SEO

    In an effort to save on costs and to ensure that the process is done to their liking, a lot of company websites are engaging in doing their own search engine optimization (SEO) analysis as well as the search engine optimization themselves. There is a positive and negative side to this cost saving aspect.

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  • Practical PowerShell for SQL Server Developers and DBAs – Part 1

    There is a lot of confusion amongst DBAs about using PowerShell due to existence the deprecated SQLPS mini-shell of SSMS and the newer SQLPS module. In a two-part article and wallchart, Michael Sorens explains how to install it, what it is, and some of the excellent things it has to offer. Compress live data by 73% Red Gate's SQL Storage Compress reduces the size of live SQL Server databases, saving you disk space and storage costs. Learn more.

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  • The Seven Sins against T-SQL Performance

    There are seven common antipatterns in T-SQL coding that make code perform badly, and three good habits which will generally ensure that your code runs fast. If you learn nothing else from this list of great advice from Grant, just keep in mind that you should 'write for the optimizer'. Compress live data by 73% Red Gate's SQL Storage Compress reduces the size of live SQL Server databases, saving you disk space and storage costs. Learn more.

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  • Cleaning Up SQL Server Deployment Scripts

    Although, generally speaking, source control is the truth, a database doesn't quite conform to the ideal because the target schema can, for valid reasons, contain other conflicting truths that can't easily be captured in source control. Dave Ballantyne explains the problems and suggests a solution. Compress live data by 73% Red Gate's SQL Storage Compress reduces the size of live SQL Server databases, saving you disk space and storage costs. Learn more.

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  • How To Support Multiple SQL Server Package Configurations in SSIS

    I have several applications that use SSIS packages and I want to be able to store all the configurations together in a single table when I deploy. When a package executes I need a way of specifying the "application" and having SSIS automatically handle the package configuration based on the application. Compress live data by 73% Red Gate's SQL Storage Compress reduces the size of live SQL Server databases, saving you disk space and storage costs. Learn more.

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  • Handling Constraint Violations and Errors in SQL Server

    The database developer can, of course, throw all errors back to the application developer to deal with, but this is neither kind nor necessary. How errors are dealt with is dependent on the application, but the process itself isn't entirely obvious. Compress live data by 73% Red Gate's SQL Storage Compress reduces the size of live SQL Server databases, saving you disk space and storage costs. Learn more.

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  • Five Effective Ways Where a Website Can Help Your Business to Grow and Expand

    The internet has brought significant changes to our ways of living, communication, marketing, and in ways of doing business today. There are major enhancements which we have been enjoying since the emergence of Internet where increase in speed and efficiency, cost saving, existence of virtual office and online courses are some of the major changes we have had over the last 20-30 years.

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  • Could not log-in properly but shows no error in joomla

    - by saeha
    I added some fields in the user registration in joomla including the image field which is blob type, all data is saving properly and i could also display the image but I could not log-in properly using the account with an uploaded image in the database and shows no error. And when I log-in as administrator in the backend, i saw this account as logged in. Any idea if what causes this problem? please help? Thank you.

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