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  • Websockets Server with Fault-Tolerance and Durable Message Store

    - by smitchell360
    I am starting to experiment with websockets. Does anyone know of a websockets server (open source or paid) that provides a durable store of the websocket "channel"? All of the examples that I have found do not address durability -- if a websockets server goes down, all "channel" data is lost. Services such as Pusher do not really discuss whether they address the durability issue (and I have not received a response from tech support yet). Happy to roll my own, but would rather not reinvent the wheel. EDIT: I'm not looking for websockets 101 information. That is readily available and understood. I'm looking for a server (open source or paid) that supports websockets and has a durable store for the websocket data so that, in the event that a server fails, a new server can take over where the original one left off. Two main purposes: 1. support failover scenarios contemplated by the websockets Network Working Group http://tools.ietf.org/html/draft-ibc-websocket-dns-srv-02#section-5.1 (most importantly so that missed messages are sent when a client connects to a failover server) 2. support scenarios where new subscribers must receive all past messages that were published. Of course this can be handled at the application layer...but that is not what I am looking for. EDIT So, after some research the following installed options seem to be the most robust: Kaazing Migratory Migratory (http://migratory.ro) Hosted services that seem "real" Pusher (great API but no history feature yet) PubNub (has history) All of the above services have graceful fallback to other communication methods if websockets are not available. I was not able to find any open source that provided "out of the box" clustering, fail-over, and a durable message store to play back history. There are some projects that may serve as good starting points, but not exactly what I am looking for.

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  • Synchronize two directories on linux pc

    - by Gab
    I need a distributed filesystem (or a synchronization tool) that is capable of keeping a directory synchronized across 4 pc. My requirements are: offline access (data must be available offline on each pc) preserve execution rights: some files are marked executable on a linux partition. This flag should be replicated. efficient sync strategy: some of my files are 20GB, they are changed quite often, but in very little parts (Virtualbox images). Delta transmissions are welcome. efficient handling of space: no history for files, files shouldn't be copied to temp directories "just in case you break it". it must propagate deletions of files modification can happen in any of the 4 pcs, they should be propagated when other pc are connected. Other specs of my solution are: Sync is over a lan, the total amount of data to be synced is around 180GB, in some ten thousand files. Changes are small, but can happen in big files. At the moment i'm interested in a linux only solution. conflicts either don't happen or are solved with "last one wins" I haven't found any good solution. I've been trying: unison: it is the only one working at the moment, but during the hashing phase it hangs my pc for some minute, disk light steady on. Sparkleshare doesn't handle large files nicely. It keeps an history of all your changes that grows up indefinitely. They promise it will be fixed in next releases, but at the moment it still doesn't fit my needs. owncloud (keeps history of each file i change) coda ? (help! i couldn't set it up correctly!) git-annex assistant transforms all your files in symlinks and mark the original file as read only ("just in case you make a mistake while you modify it"!). Before you edit a file you have to issue a special command "git-annex unlock", that creates a local copy of the file, and you have to remember to lock it again if you want it synchronized. What to try next?

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  • Is it possible to trace someone using Google during an online exam?

    - by George
    I happen to be a professor at a reputed college. I want to design an online exam for over 1000 students via around 50 computers right after the vacation ends. Now the problem is that I have heard that many students use Google on a different tab to find answers when no invigilator is around. I want to know if there is a way to backtrace it after the exams via some kind of history or any other possible way. In our university there is a standard system. I am not good with computers but I will try to explain. Each computer uses mozilla to connect to a server centrally located via an IP. The students open it and enter a unique ID and password to start the exams. Many questions are jumbled and different groups of students give exam in a different time slot. Is there any way to trace it since I want to set an example for students so they won't cheat and give exams in an honest way. Additional details: Since the number of computers are less than the number of students, more than 10 students are going to use a single computer on a single day over a period of 10 hours. After this, if I check the history (and let's say someone even forgot to delete the history and I see it), will I able to figure out who among the 10 has done it? Moreover, is it even practical and feasible?

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  • SQL Server Full Text Search Special character issue

    - by ManojTrek
    Hello, I have Full Text catalog created in SQL Server 2005, when I search the text like "Bolivia's History", it returns all the result matching to that, but if I use "Bolivias History", it does not return anything, I am very new to Full Text Search stuff, any lead how to ignore the special character ("'"), in Full Text Search? Thanks in Advance, Manoj

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  • Git repo planning questions

    - by masonk
    At work, development uses perforce to handle code sharing. I won't say "revision control", because we aren't allowed to check in changes until they are ready for regression testing. In order to get my personal change sets under revision control, I've been given the go-ahead to build my own git and initialize the client view of the perforce depot as a git repo. There are some difficulties in doing this, however. The client view lives in a subfolder of ~, (~/p4), and I want to put ~ under revision control as well, with its own separate history. I can't figure out how to keep the history for ~ separate from ~/p4 without using a submodule. The problem with a submodule is that it looks like I have to go make a repository that will become the submodule and then git submodule add <repo> <path>. But there is nowhere to make the submodule's repository except in ~. There seems to be no safe place to create the initial client view of the depot with git p4 clone. (I'm working off of the assumption that initing or cloning a repo into a subdirectory of a git repo is not supported. At least, I can find nothing authoritative on nested git repos.) edit: Is merely ignoring ~/p4 in the repo rooted at ~ enough to allow me to init a nested repo in ~/p4? My __git_ps1 function still thinks I'm in a git repository when I visit an ignored subdirectory of a git repo, so I'm inclined to think not. I need the "remote" repository created by git p4 sync to be a branch in ~/p4. We are required to keep all of our code in ~/p4 so that it doesn't get backed up. Can I pull from a "remote" branch that is really a local branch? This one is just for convenience, but I thought I could learn something by asking it. For 99% of the project, I just want to start the with the p4 head revision as the inital commit object. For the other 1%, I would like to suck down the entire p4 history so that I can browse it in git. IOW, after I'm done initalizing it, the initial commit of remotes/p4/master branch will contain: revision 1 of //depot/prod/Foo/Bar/* revision X of other files in //depot/prod/*, where X is the head revision and the remotes/p4/master branch contains Y commits, where Y is the number of changelists that had a file in //depot/prod/Foo/Bar/*, with each commit in the history corresponding to one of those p4 changelists, and HEAD looking like p4's head.

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  • jQuery "Autocomplete" plugin is messing up the order of my data

    - by Max Williams
    I'm using Jorn Zaefferer's Autocomplete plugin on a couple of different pages. In both instances, the order of displayed strings is a little bit messed up. Example 1: array of strings: basically they are in alphabetical order except for General Knowledge which has been pushed to the top: General Knowledge,Art and Design,Business Studies,Citizenship,Design and Technology,English,Geography,History,ICT,Mathematics,MFL French,MFL German,MFL Spanish,Music,Physical Education,PSHE,Religious Education,Science,Something Else Displayed strings: General Knowledge,Geography,Art and Design,Business Studies,Citizenship,Design and Technology,English,History,ICT,Mathematics,MFL French,MFL German,MFL Spanish,Music,Physical Education,PSHE,Religious Education,Science,Something Else Note that Geography has been pushed to be the second item, after General Knowledge. The rest are all fine. Example 2: array of strings: as above but with Cross-curricular instead of General Knowledge. Cross-curricular,Art and Design,Business Studies,Citizenship,Design and Technology,English,Geography,History,ICT,Mathematics,MFL French,MFL German,MFL Spanish,Music,Physical Education,PSHE,Religious Education,Science,Something Else Displayed strings: Cross-curricular,Citizenship,Art and Design,Business Studies,Design and Technology,English,Geography,History,ICT,Mathematics,MFL French,MFL German,MFL Spanish,Music,Physical Education,PSHE,Religious Education,Science,Something Else Here, Citizenship has been pushed to the number 2 position. I've experimented a little, and it seems like there's a bug saying "put things that start with the same letter as the first item after the first item and leave the rest alone". Kind of mystifying. I've tried a bit of debugging by triggering alerts inside the autocomplete plugin code but everywhere i can see, it's using the correct order. it seems to be just when its rendered out that it goes wrong. Any ideas anyone? max EDIT - reply to Clint Thanks for pointing me at the relevant bit of code btw. To make diagnosis simpler i changed the array of values to ["carrot", "apple", "cherry"], which autocomplete re-orders to ["carrot", "cherry", "apple"]. Here's the array that it generates for stMatchSets: stMatchSets = ({'':[#1={value:"carrot", data:["carrot"], result:"carrot"}, #3={value:"apple", data:["apple"], result:"apple"}, #2={value:"cherry", data:["cherry"], result:"cherry"}], c:[#1#, #2#], a:[#3#]}) So, it's collecting the first letters together into a map, which makes sense as a first-pass matching strategy. What i'd like it to do though, is to use the given array of values, rather than the map, when it comes to populating the displayed list. I can't quite get my head around what's going on with the cache inside the guts of the code (i'm not very experienced with javascript).

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  • How to search through all commits in the repository?

    - by Josip
    I have a git repository with few branches and dangling commits. I would like to search all such commits in repository for a specific string. I know how to get a log of all commits in history, but these don't include branches or dangling blobs, just HEAD's history. I want to get them all, to find a specific commit that got misplaced. I would also like to know how to do this in mercurial, as I'm considering the switch.

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  • Seeing release markers in svn log

    - by chuanose
    Whenever we make a release of a project we'll create a tag to capture the snapshot. It will be very helpful to be able to see which revisions in the trunk history were used in certain releases. I know the TortoiseSVN revision graph shows this information, but I'm wondering if there's a way to see it in the command-line svn log? I'm coming from a Clearcase background where we'll be able to see the release labels in the history.

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  • How do I add values from two seperate querys in SQL

    - by fishhead
    Below is my attempt at addinf two values from seperate select statments...it's not working...I can't see why. Looking for some direction thanks select (v1.Value + v2.Value) as total from ( (Select Max(Value) as [Value] from History WHERE Datetime>='Apr 11 2010 6:05AM' and Datetime<='Apr 11 2010 6:05PM' and Tagname ='RWQ272017DTD' ) as v1 (Select Max(Value) as [Value] from History WHERE Datetime>='Apr 11 2010 6:05AM' and Datetime<='Apr 11 2010 6:05PM' and Tagname ='RU282001DTD' ) as v2 ) boy do I feel foolish...I asked the same question a few days ago...now I can't delete this.

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  • Triggers in NHibernate

    - by Felipe
    Hi everybody, I'd like to know if is there something like a Trigger (of databases) in NHibernate that I can use per entity ? I'd like to make a history of each record, and with triggers I can compare the old value and new value of each property and generate a register of history. I've heard about Audit in NHibernate, but it's for all entities, if there isn't another way... how Can I separete a block per entity ? Thanks

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  • jQuery tools tabs fade effect

    - by kielie
    Hi guys, I used jQuery tools to create a tabs setup, and I would like to incorporate the fade effect, but when I try to do so, it bombs out, here is my code: $(function() { $("#flowtabs").tabs("#flowpanes > div", { history: true, effect: 'fade' }); }); I am assuming that it's because I am also enabling the tabs history? I am kinda new to all of this, so please be patient! :-) Thanx in advance!

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  • How to properly use the .animate() function -- top

    - by sadmicrowave
    Is this the proper way to use the .animate(top) function? Positive number (animate down)-- $("div#container div#history-menu").animate({top:'180px'}, 600); Negative number (animate up)-- $("div#container div#history-menu").animate({top:'-180px'}, 600); Because I'm getting a java error in my error console that says: "error in parsing value for property 'top'. Declaration Dropped."

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  • Question about ITextUndoHistory returned from TryGetHistory

    - by nick.ueda
    Everytime the IWpfTextView's TextBuffer changes I am trying to get the history's redostack and undostack and simply checking the count. When doing this I am encountering a "Method not supported exception" when trying to access the two stacks. Am I retrieving the history incorrectly or does VS not want me seeing/editing the contents of the stacks? I can post the code if necessary... Thanks, Nick

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  • how do I subtract values from two select statements

    - by fishhead
    I would like to subtract one value from another value. The schema of the table is as follows: tag, datetime,value ------------ tag1, 2010-1-1 10:10:00, 123 tag2, 2010-2-2 10:12:00. 321 select * from ( (Select Max(Value) as [Value1] from History WHERE Datetime ='2010-1-1 10:10' and tagname ='tag1') as v1 - ( (Select Max(Value) as [Value2] from History WHERE Datetime ='2010-1-1 10:12' and Tagname ='tag2') as v2)) obviously I am lost...how do I do this. thanks ms-sql

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  • Question about the ITextUndoHistory that gets returned from TryGetHistory

    - by Nick U
    Everytime the IWpfTextView's TextBuffer changes I am trying to get the history's redostack and undostack and simply checking the count. When doing this I am encountering a "Method not supported exception" when trying to access the two stacks. Am I retrieving the history incorrectly or does VS not want me seeing/editing the contents of the stacks? I can post the code if necessary... Thanks, Nick

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  • Mercurial permament delete?

    - by Arnis L.
    I commit some 3rd party tools that i decided not to use afterwards and removed them from hg again. Thing that i dislike - they are still kept in history. Normally this is a good thing of course, but for this particular case - that's just a waste of space. What are options to intentionally mess around with hg repository history and weed it out?

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  • Need to recover local changes overwritten by p4 revert

    - by Nayn
    Hi, I had a pending changelist in my workspace. By mistake I reverted one of the files by reverting to depot. Eclipse wiped off the local history. I am not sure if perforce keeps any history for pending changelists. Could someone tell me if it is possible to recover such file. Thanks Nayn

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  • why this sql code dont work

    - by magy
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=windows-1256"> <title>??? ?????? ???? ????</title> </head> <body> <table width="100%" border="1"> <tr> <td>name</td> <td>number</td> <td>math</td> <td>arab</td> <td>history</td> <td>geo</td> </tr> <?php require_once "conf.php"; $sql2=("SELECT * FROM student WHERE snum = $ss"); $rs2 = mysql_query($sql2) or die(mysql_error()); $num = mysql_num_rows($rs2); $ss= $_POST["ss"]; if (empty($ss)) { echo "please write your search words";} else if ($num < 1 ) { echo "not found any like "; }else { $sql=("SELECT * FROM student WHERE snum = $ss "); $rs = mysql_query($sql) or die(mysql_error()); while($data=mysql_fetch_array($rs)){ $name=$data["sname"]; $number=$data["snum"]; $math=$data["math"]; $arab=$data["arab"]; $history=$data["history"]; $geo=$data["geo"]; echo" <tr> <td>$name</td> <td>$number</td> <td>$math</td> <td>$arab</td> <td>$history</td> <td>$geo</td> </tr> "; } }; ?> </table> </body> </html>

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  • Are you concerned by section 3.3.1? [closed]

    - by CJ_Reed
    Are you an iPhone developer using tools other than Objective-C for your coding (i.e. Phonegap, Unity3d, Monotouch, Corona or Titanium, etc?) Have you heard of or read section 3.3.1? If you are concerned vote on the petition at [solicitation removed - see history] Join the facebook group 'Article 3.3.1' and have your say: [solicitation removed - see history] And most importantly contact apple through their web portal and ask for clarification

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  • Best way to have common class shared by both C++ and Ruby?

    - by shuttle87
    I am currently working on a project where a team of us are designing a game, all of us are proficient in ruby and some (but not all) of us are proficient in c++. Initially we made the backend in ruby but we ported it to c++ for more speed. The c++ port of the backend has exactly the same features and algorithms as the original ruby code. However we still have a bunch of code in ruby that does useful things but we want it to now get the data from the c++ classes. Our first thought was that we could save some of the data structures in something like XML or redis and call that, but some of the developers don't like that idea. We don't need anything particularly complex data structures to be passed between the different parts of the code, just tuples, strings and ints. Is there any way of integrating the ruby code so that it can call the c++ stuff natively? Will we need to embed code? Will we have to make a ruby extension? If so are there any good resources/tutorials you could suggest? For example say we have this code in the c++ backend: class The_game{ private: bool printinfo; //print the player diagnostic info at the beginning if true int numplayers; std::vector<Player*> players; string current_action; int action_is_on; // the index of the player in the players array that the action is now on //more code here public: Table(std::vector<Player *> in_players, std::vector<Statistics *> player_stats ,const int in_numplayers); ~Table(); void play_game(); History actions_history; }; class History{ private: int action_sequence_number; std::vector<Action*> hand_actions; public: void print_history(); void add_action(Action* the_action_to_be_added); int get_action_sequence_number(){ return action_sequence_number;} bool history_actions_are_equal(); int last_action_size(int street,int number_of_actions_ago); History(); ~History(); }; Is there any way to natively call something in the actions_history via The_game object in ruby? (The objects in the original ruby code all had the same names and functionality) By this I mean: class MyRubyClass def method1(arg1) puts arg1 self.f() # ... but still available puts cpp_method.the_current_game.actions_history.get_action_sequence_number() end # Constructor: def initialize(arg) puts "In constructor with arg #{arg}" #get the c++ object here and call it cpp_method end end Is this possible? Any advice or suggestions are appreciated.

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  • Copying subversion commit messages

    - by Falcor
    I know this isn't the BEST practice, but every once in a while when I'm merging up a huge batch up changes with the trunk (and I know my branch is current), I will simply delete the contents of the trunk and then copy the contents of my branch up, so that I don't have to deal with resolving conflicts for an hour. The problem is that I seem to lose the entire history of commit messages for each file. My branch still has the correct history of commit messages... how can I merge them up?

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  • w00t! First post!

    - by blaird
    So, I busted my old blog and hadn't been keeping up with it. Decided it would be easier on me to use software that I didn't maintain, so several months ago I signed up for a GWB account. You are a witness to procrastination at its finest!  I was remarking to my friend Abby that I hadn't written anything in ages, that I've typed a bunch in the last 5 years or so, but that the typing belonged to someone else as work product, was boring technical mumbo jumbo, or was only good before it spoiled, that project/job/technology/tweet based freshness window that us geeks have to deal with. In short, I just didn't feel like it. So forgive the rambling sentences and my grammatical failures, you have Abby to thank ;) On the technology front I've been working with WPF, WCF and a whole lot of other alphabet soup in terms of patterns. I'm starting to get spoiled on Visual Studio 2010, and may have made a mistake by evaluating the ultimate version. Because I'm a .NET geek and an outdoor geek, expect a hodgepodge. It's nearly Easter, which for the garden means a whole lot of things. I've already started getting seed out, and started working soil. It feels good to get real dirt on your hands.

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