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  • Amazon EC2 and Named Virtual Hosts

    - by user71718
    I am running ubuntu apache2 on an Amazon EC2 instance running behind an Amazon ELB (load balancer) I am trying to get multiple domain running pointing to different virtual hosts. The problem is I cannot get virtual hosts working with name - I can only get it working with I am trying to get www.domain1.com and www.domain2.com working When I setup my virtual hosts to it doesnt work Any ideas please??

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  • Nginx traffic is going to wrong upsteam when mixing named servers and default servers

    - by Morgan
    I have the below config file for nginx. The problem is all traffic is going to upstream clustera. How do I configure nginx to only send traffic for example.com to clustera and all the rest to clusterb? user www-data; worker_processes 1; error_log /var/log/nginx/error.log; pid /var/run/nginx.pid; events { worker_connections 1024; } http { include /etc/nginx/mime.types; log_format cache '\n*** $remote_addr [$time_local] ' '[$upstream_cache_status] $upstream_response_time ' '$host "$request" ($status) $body_bytes_sent ' '"$http_referer" "$http_user_agent" ' 'Cache-Control: $upstream_http_cache_control ' 'Expires: $upstream_http_expires ' ; access_log /var/log/nginx/access.log cache; sendfile on; keepalive_timeout 65; gzip on; gzip_vary on; gzip_comp_level 6; gzip_proxied any; gzip_disable "MSIE [1-6]\.(?!.*SV1)"; gzip_buffers 16 8k; include /etc/nginx/conf.d/*.conf; proxy_cache_key "$scheme$host$request_uri"; proxy_cache_path /var/cache/nginx levels=1:2 keys_zone=main:10m max_size=1g inactive=30m; upstream clustera { ip_hash; server a.example.com:80; } upstream clusterb { ip_hash; server b.example.com:80; } client_max_body_size 20m; client_body_buffer_size 128k; proxy_connect_timeout 300; proxy_send_timeout 300; proxy_read_timeout 300; # host for example.com should send traffic to clustera server { listen 80; server_name example.com; location ~*(png|jpeg|jpg|gif|ico|css|js)$ { proxy_pass http://clustera; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_cache main; proxy_cache_valid 200 5m; proxy_cache_valid 302 1m; } location / { proxy_pass http://clustera; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; } } # host for everyone else. traffic goes to clusterb server { listen 80; server_name _; if ( $http_user_agent ~* (spider|crawler|slurp) ) { return 503; } set $slow 0; if ( $http_user_agent ~* (bot) ) { set $slow 1; } if ( $slow ) { set $limit_rate 1k; } location ~*(png|jpeg|jpg|gif|ico|css|js)$ { proxy_pass http://clusterb; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_cache main; proxy_cache_valid 200 5m; proxy_cache_valid 302 1m; } location /images { proxy_pass http://clisterb; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_cache main; proxy_cache_valid 200 5m; proxy_cache_valid 302 1m; } location / { proxy_pass http://clusterb; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; } } }

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  • why my server has a dir named "?"

    - by liuxingruo
    These are all the dirs in my server: ? bin boot dev etc home lib lost+found media media2 misc mnt net opt proc root sbin selinux srv sys tmp usr var why there is a "?" dir? Thanks very much. BTW: the touch command was found on my server(wiered). I list the bin dir: alsacard cp dd env hostname loadkeys more ps sed tcptraceroute alsaunmute cpio df ex igawk loadkeys.static mount pwd setfont traceroute6 arch csh dmesg false ipcalc logger mountpoint raw setserial tracert awk cut dnsdomainname fgrep kbd_mode login mv red sh view basename date doexec gawk keyctl ls netstat redhat_lsb_init sleep ypdomainname bash dbus-cleanup-sockets domainname gettext kill mail nice rm sort cat dbus-daemon dumpkeys grep ksh mailx nisdomainname rmdir stty chgrp dbus-monitor echo gtar ksh93 mkdir pgawk rpm su chmod dbus-send ed gunzip link mknod ping rvi sync chown dbus-uuidgen egrep gzip ln mktemp ping6 rview tar touch is missing, how can i get it back?

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  • I am not seeing named session in gnu screen

    - by dorelal
    I am tying to learn gnu screen. I am using mac(snow leopard). I am running 4.00.03 version of screen. I am starting a new screen with following command screen -S foo However after that if I do ctrl + A + " then I see the list of screens. However all the lists have numbers and then bash. Because all it says is 'bash' I can't figure out which screen has what. Am I missing something?

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  • How to close the logon process named NtLmSsp ?

    - by Aristos
    I have a windows 2003 server and time to time I am getting many login failures like this one. Logon Failure: Reason: Unknown user name or bad password User Name: administrator Domain: xx.xx.xx.xx Logon Type: 3 Logon Process: NtLmSsp Authentication Package: NTLM Workstation Name: XLHOST Caller User Name: - Caller Domain: - Caller Logon ID: - Caller Process ID: - Transited Services: - Source Network Address: 173.45.70.100 <- hacker Source Port: 4722 AND Logon attempt by: MICROSOFT_AUTHENTICATION_PACKAGE_V1_0 Logon account: user Source Workstation: XLHOST Error Code: 0xC0000064 The question is, how can I close this process of login ?, what I have left open and some one can try to login ? Some notes: I login to the server using tunneling, nothing is open except dns, email, and web ports, not even ftp, and all default ports are change and hidden. I also monitor port scan and capture any one that try to find the hidden ports. Probably it is something open... Thank you in advanced.

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  • bind named server - forward some requests to other servers

    - by Pentium100
    Is there a way to make bind answer some queries but forward all other queries (of the same domain) to another server, as in: example.com A 127.0.0.1 www.example.com A 127.0.0.1 everything not on this list (example.com MX, ftp.example.com A etc) - ask 192.168.0.1 (another DNS server) Essentially I want to intercept some (but not all) queries going to (in this example) 192.168.0.1 and answer for it. example.com A- intercept www.example.com - intercept example.com MX - pass trough ftp.example.com - pass trough

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  • Creating a folder named after the current date and time

    - by lowerkey
    I'm trying to create a powershell script that creates a new folder with the current date (formatted as yyyy-MM-dd) as a name. Here's what I have so far: PS C:\Users\me\Desktop> powershell.exe -command "new-item ($(get-location) + (Get-Date).year + "-" + (Get-Date).month + "-" + (Get-Date).day) -type directo ry" Die Benennung "C:\Users\me\Desktop" wurde nicht als Name eines Cmdlet, ein er Funktion, einer Skriptdatei oder eines ausführbaren Programms erkannt. Überp rüfen Sie die Schreibweise des Namens, oder ob der Pfad korrekt ist (sofern ent halten), und wiederholen Sie den Vorgang. Bei Zeile:1 Zeichen:35 + new-item (C:\Users\me\Desktop <<<< + (Get-Date).year + - + (Get-Date). month + - + (Get-Date).day) -type directory + CategoryInfo : ObjectNotFound: (C:\Users\j.moore\Desktop:String ) [], CommandNotFoundException + FullyQualifiedErrorId : CommandNotFoundException

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  • Kill named running screen with -X only works after reattached

    - by oversize
    Hello I am using ubuntu 8.04.4 and would like to start daemons like this: screen -dmS SESSIONNAME script.sh Then i want to kill these screens with -X like so screen -S SESSIONAME -X kill But, this does not work. Only if i attach and detach that session it gets kill'ed with above command. What am i doing wrong? I would like to not have to attach/deattach the session to kill it since i want to use fabric scripts that start/stop daemons remotly. - Thank you

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  • Ubuntu 12.04: Unable to add or delete a user named 'mysql'

    - by Afaque H
    I am trying to install MySql on Ubuntu 12.04 but the installation is failing with the error: "Can't change to run as user 'mysql'. Check if the user 'mysql' exits." So I go ahead type in the command : 'cat /etc/passwd | grep mysql' and result is null. I try to add a user 'mysql' by issuing the command 'useradd mysql'/. But it fails with the message: 'useradd: user 'mysql' already exists'. When I try to delete the user 'mysql' using the command 'userdel mysql' it also fails with the message "userdel: cannot remove entry 'mysql' from /etc/passwd." Can anyone explain me what's going on and suggest a solution.

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  • In Process Explorer is it possible change scaling of activity graph the be able to further analyse graph?

    - by therobyouknow
    Is there any way to zoom in, in the System Internals Process Explorer graph? Background I'm trying to work out why my PC freezes/locks up for about a second (the pointer does not move) every so often. This has only been happening for the last 2 days. There is a very narrow spike associated with the freeze, but it's hard to hover over it an analyse what is causing it. My PC spec: ThinkPad X201S 1440x900 i7 2.0GHz 8Gb RAM, 256GB Samsung 840Pro SSD, Windows 8.1 Pro 64bit CalDigit USB 3.0 ExpressCard 34, Ultrabase X200 with DisplayPort to HDMI

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  • Create text file named after a cell containing other cell data

    - by user143041
    I tried using the code below for the Excel program on my `Mac Mini using the OS X Version 10.7.2 and it keeps saying Error due to file name / path: (The Excel file I am creating is going to be a template with my formulas and macros installed which will be used over and over). Sub CreateFile() Do While Not IsEmpty(ActiveCell.Offset(0, 1)) MyFile = ActiveCell.Value & ".txt" fnum = FreeFile() Open MyFile For Output As fnum Print #fnum, ActiveCell.Offset(0, 1) & " " & ActiveCell.Offset(0, 2) Close #fnum ActiveCell.Offset(1, 0).Select Loop End Sub What Im trying to do: 1st Objective I would like to have the following data to be used to create a text file. A:A is what I need the name of the file to be. B:2 is the content I need in the text file. So, A2 - "repair-video-game-Glassboro-NJ-08028.txt" is the file name and B2 to be the content in the file. Next, A3 is the file name and B3 is the content for the file, etc. ONCE the content reads what is in cell A16 and B16 (length will vary), the file creation should stop, if not then I can delete the additional files created. This sheet will never change. Is there a way to establish the excel macro to always go to this sheet instead of have to select it with the mouse to identify the starting point? 2nd Objective I would like to have the following data to be used to create a text file. A:1 is what I need the name of the file to be. B:B is the content I want in the file. So, A2 - is the file name "geo-sitemap.xml" and B:B to be the content in the file (ignore the .xml file extension in the photo). ONCE the content cell reads what is in cell "B16" (length will vary), the file creation should stop, if not then I can adjust the cells that have need content (formulated content you see in the image is preset for 500 rows). This sheet will never change. Is there a way to establish the excel macro to always go to this sheet instead of have to select it with the mouse to identify the starting point? I can Provide the content in the cells that are filled in by excel formulas that are not not to be included in the .txt files. It is ok if it is not possible. I can delete the extra cells that are not populated (based on the data sheet). Please let me know if you need any more additional information or clarity and I will be happy to provide it.

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  • Issues with "There is already an object named 'xxx' in the database'

    - by Hoser
    I'm fairly new to SQL so this may be an easy mistake, but I haven't been able to find a solid solution anywhere else. Problem is whenever I try to use my temp table, it tells me it cannot be used because there is already an object with that name. I frequently try switching up the names, and sometimes it'll let me work with the table for a little while, but it never lasts for long. Am I dropping the table incorrectly? Also, I've had people suggest to just use a permanent table, but this database does not allow me to do that. create table #RandomTableName(NameOfObject varchar(50), NameOfCounter varchar(50), SampledValue decimal) select vPerformanceRule.ObjectName, vPerformanceRule.CounterName, Perf.vPerfRaw.SampleValue into #RandomTableName from vPerformanceRule, vPerformanceRuleInstance, Perf.vPerfRaw where (ObjectName like 'Processor' AND CounterName like '% Processor Time') OR(ObjectName like 'System' AND CounterName like 'Processor Queue Length') OR(ObjectName like 'Memory' AND CounterName like 'Pages/Sec') OR(ObjectName like 'Physical Disk' AND CounterName like 'Avg. Disk Queue Length') OR(ObjectName like 'Physical Disk' AND CounterName like 'Avg. Disk sec/Read') OR(ObjectName like 'Physical Disk' and CounterName like '% Disk Time') OR(ObjectName like 'Logical Disk' and CounterName like '% Free Space' AND SampleValue > 70 AND SampleValue < 100) order by ObjectName, SampleValue drop table #RandomTableName

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  • Trap SIGPIPE when trying to write without reader

    - by Matt
    I am trying to implement a named-pipe communication solution in BASH between two processes. The first process runs a script which echo something in a named-pipe: send(){ echo 'something' > $NAMEDPIPE } And the second script is supposed to read the named-pipe via another script which contains: while true;do if read line < $NAMEDPIPE;do someCommands fi done Not that the named pipe has been previously created using the traditional command mkfifo $NAMEDPIPE My problem is that the reader script is not always running so that if the writer script try to write in the named-pipe it stay blocked until a reader connect the pipe. I want to avoid this behavior, and a solution would be to trap a SIGPIPE signal. Indeed, according to man 7 signal is supposed to be send when trying to write in a pipe with no reader. So I changed my red function by: read(){ trap 'echo "SIGPIPE received"' SIGPIPE echo 'something' > $NAMEDPIPE } But when I run the reader script, the script stay blocked, and not "SIGPIPE received" appears... Am I mistaking on the signal mechanism or is there any better solution to my problem ? Thank you for your help.

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  • Better Way To Use C++ Named Parameter Idiom?

    - by Head Geek
    I've been developing a GUI library for Windows (as a personal side project, no aspirations of usefulness). For my main window class, I've set up a hierarchy of option classes (using the Named Parameter Idiom), because some options are shared and others are specific to particular types of windows (like dialogs). The way the Named Parameter Idiom works, the functions of the parameter class have to return the object they're called on. The problem is that, in the hierarchy, each one has to be a different class -- the createWindowOpts class for standard windows, the createDialogOpts class for dialogs, and the like. I've dealt with that by making all the option classes templates. Here's an example: template <class T> class _sharedWindowOpts: public detail::_baseCreateWindowOpts { public: /////////////////////////////////////////////////////////////// // No required parameters in this case. _sharedWindowOpts() { }; typedef T optType; // Commonly used options optType& at(int x, int y) { mX=x; mY=y; return static_cast<optType&>(*this); }; // Where to put the upper-left corner of the window; if not specified, the system sets it to a default position optType& at(int x, int y, int width, int height) { mX=x; mY=y; mWidth=width; mHeight=height; return static_cast<optType&>(*this); }; // Sets the position and size of the window in a single call optType& background(HBRUSH b) { mBackground=b; return static_cast<optType&>(*this); }; // Sets the default background to this brush optType& background(INT_PTR b) { mBackground=HBRUSH(b+1); return static_cast<optType&>(*this); }; // Sets the default background to one of the COLOR_* colors; defaults to COLOR_WINDOW optType& cursor(HCURSOR c) { mCursor=c; return static_cast<optType&>(*this); }; // Sets the default mouse cursor for this window; defaults to the standard arrow optType& hidden() { mStyle&=~WS_VISIBLE; return static_cast<optType&>(*this); }; // Windows are visible by default optType& icon(HICON iconLarge, HICON iconSmall=0) { mIcon=iconLarge; mSmallIcon=iconSmall; return static_cast<optType&>(*this); }; // Specifies the icon, and optionally a small icon // ...Many others removed... }; template <class T> class _createWindowOpts: public _sharedWindowOpts<T> { public: /////////////////////////////////////////////////////////////// _createWindowOpts() { }; // These can't be used with child windows, or aren't needed optType& menu(HMENU m) { mMenuOrId=m; return static_cast<optType&>(*this); }; // Gives the window a menu optType& owner(HWND hwnd) { mParentOrOwner=hwnd; return static_cast<optType&>(*this); }; // Sets the optional parent/owner }; class createWindowOpts: public _createWindowOpts<createWindowOpts> { public: /////////////////////////////////////////////////////////////// createWindowOpts() { }; }; It works, but as you can see, it requires a noticeable amount of extra work: a type-cast on the return type for each function, extra template classes, etcetera. My question is, is there an easier way to implement the Named Parameter Idiom in this case, one that doesn't require all the extra stuff?

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  • No Persistence provider for EntityManager named ...

    - by Robert A Henru
    I have my persistence.xml with the same name, using toplink, under META-INF directory. Then I have my code calling it with... EntityManagerFactory emfdb = Persistence.createEntityManagerFactory("agisdb"); Yet, I got the following error message 2009-07-21 09:22:41,018 [main] ERROR - No Persistence provider for EntityManager named agisdb javax.persistence.PersistenceException: No Persistence provider for EntityManager named agisdb at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:89) at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:60) Here is the persistence.xml... <?xml version="1.0" encoding="UTF-8"?> <persistence xmlns="http://java.sun.com/xml/ns/persistence" version="1.0"> <persistence-unit name="agisdb"> <class>com.agis.livedb.domain.AddressEntity</class> <class>com.agis.livedb.domain.TrafficCameraEntity</class> <class>com.agis.livedb.domain.TrafficPhotoEntity</class> <class>com.agis.livedb.domain.TrafficReportEntity</class> <properties> <property name="toplink.jdbc.url" value="jdbc:mysql://localhost:3306/agisdb"/> <property name="toplink.jdbc.driver" value="com.mysql.jdbc.Driver"/> <property name="toplink.jdbc.user" value="root"/> <property name="toplink.jdbc.password" value="password"/> </properties> </persistence-unit> </persistence> It should have been in the classpath... Yet, I got the above error... Really appreciate any help... Thanks

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  • How to resize a Flot graph when its containing div changes size

    - by Will Gorman
    I'm using the Flot graphing library jQuery plugin and I haven't found a good way to handle resizing the graph when it's containing <div> changes size (for example, due to window resizing). When handling the onresize event, I've made sure that the width and height of the containing <div>are updated to the correct size and then tried calling both setupGrid and draw on the plot object but with no effect. I've had some success with the approach of just removing and readding the containing <div> and replotting the graph in it. However, this seems to be prone to getting stuck in infinite resize event loops if I have to add other <div> elements to the document at the same time (like for tooltips for the graph) as I'm guessing those can trigger resize events as well? Is there a good way to handle it that I'm missing? (I'm also using ExplorerCanvas for IE in order to be able to use Flot, if that might have anything to do with it. I haven't really tried in any other browsers yet)

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  • Draw a column graph with no space between columns

    - by Andrew Shepherd
    I am using the WPF toolkit, and am trying to render a graph that looks like a histogram. In particular, I want each column to be right up against each other column. There should be no gaps between columns. There are a number of components that you apply when creating a column graph. (See example XAML below). Does anybody know if there is a property you can set on one of the elements which refers to the width of the white space between columns? <charting:Chart Height="600" Width="Auto" HorizontalAlignment="Stretch" Name="MyChart" Title="Column Graph" LegendTitle="Legend"> <charting:ColumnSeries Name="theColumnSeries" Title="Series A" IndependentValueBinding="{Binding Path=Name}" DependentValueBinding="{Binding Path=Population}" Margin="0" > </charting:ColumnSeries> <charting:Chart.Axes> <charting:LinearAxis Orientation="Y" Minimum="200000" Maximum="2500000" ShowGridLines="True" /> <charting:CategoryAxis Name="chartCategoryAxis" /> </charting:Chart.Axes> </charting:Chart>

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  • storing/retrieving data for graph with long continuous stretches

    - by james
    i have a large 2-dimensional data set which i would like to graph. the graph is displayed in a browser and the data is retrieved via ajax. long stretches of this graph will be continuous - e.g., for x=0 through x=1000, y=9, then for x=1001 through x=1100, y=80, etc. the approach i'm considering is to send (from the server) and store (in the browser) only the points where the data changes. so for the example above, i would say data[0] = 9, then data[1001] = 80. then given x=999 for example, retrieving data[999] would actually look up data[0]. the problem that arises is finding a dictionary-like data structure which behaves like this. the approach i'm considering is to store the data in a traditional dictionary object, then also maintain a sorted array of key for that object. when given x=999, it would look at the mid-point of this array, determine whether the nearest lower key is left or right of that midpoint, then repeat with the correct subsection, etc.. does anyone have thoughts on this problem/approach?

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  • jQuery capture all changes to named inpt on a form

    - by Brian M. Hunt
    I'm trying to determine when any of a set of named input/select/radio/checked/hidden fields in a form change. In particular, I'd like to capture when any changes are made to fields matching jQuery's selector $("form :input"), and where that input is has a name attribute. However, the form isn't static i.e. some of the fields are dynamically added later. My initial thought is to keep track of when new named elements matching :input are added, and then add an event handler, like this: function on_change() { alert("The form element with name " + $(this).attr("name") + " has changed"); } function reg_new_e_handler(input_element) { input_element.change(on_change); } However, I'm quite hopeful I can avoid this with some jQuery magic. In particular, is there a way to register an event handler in jQuery that would handle input elements that match the following: $("form :input").filter( function () { $(this).attr("name") } ).change(on_change); However, have this event set update whenever new input elements are added. I've thought that it may be possible to capture keyup event on the form node with $("form").keyup(on_change), but I'm not so sure how one could capture change events. I'd also like this to capture keyup events. Thank you for reading. Brian

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  • Django error - no module named

    - by Shreyas
    Here is my relevant directory structure (Windows 7, Python 2.7, virtualenv) -userProf - - manage.py - -UserProfile - sampleapp_db - urls.py - views.py - wsgi.py - __init__.py - -libs - - __init__.py - -allauth - - app_settings.py - - models.py - - tests.py - - urls.py - - utils.py - - - -account - - - admin.py - - - context_processors.py - - - models.py - - - urls.py - - - __init__.py - -socialaccount - - - admin.py - - - context_processors.py - - - models.py - - - urls.py - - - views.py - - - __init__.py - - - - -templates - -account - - - base.html - - - email.html -settings - base_settings.py - dev.py - __init__.py - -static -css I get the following error when I try to run this dango app Error: No module named account I have read other posts on SO that refer to the syspath being the issue or that the appname matches the project name Django Shell No module named settings ...as a result of this, I added the following statements in the base_settings.py file import sys base = os.path.abspath(os.path.dirname(os.path.dirname(__file__))) base_parent = os.path.dirname(base) sys.path.append(base) sys.path.append(base_parent) sys.path.append(os.path.join(base,'libs')) sys.path.append(os.path.join(base,'libs','allauth','account')) I verified that the sys.path is correct by putting a break in PyCharm and evaluating sys.path Should I be putting this in manage.py? Some other SO postings referred to not being able to import the module but I can launch the python console and import UserProfile.libs.allauth.account without any exceptions being thrown! My base_setings.py has the following relevant section INSTALLED_APPS = ( 'UserProfile.libs.allauth.account', )

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  • Named previously unnamed branch

    - by Jab
    It seems naming a previously unnamed branch doesn't really work out. It creates a nasty multiple heads problem that I can't find a solution for. Here is the workflow... UserA starts working on feature that they expect to be small, so they just start working(off the default branch). The change turns out to be a large project and will need multiple contributors. So UserA issues... hg branch "Feature1" and continues working, committing locally s needed. UserA then pulls down the changes from the central repo so he can push. At this point, why does hg heads return 3 heads? It shows 2 for default and 1 for Feature1. The first head for default is the latest change by another user on the branch(irrelevant). The second default head is the commit prior to the hg branch "Feature1" commit. The central repository has rules enforced so that only 1 head per branch is allowed, so forcing a push isn't an option. The repo doesn't want multiple heads on the default branch. UserA should be able to push these changes so that other users can see the Feature1 branch and help out. I can't seem to find a way to "correct" this. I don't think I can re-write the branch of the initial commits for the feature, before it was a named branch. I know the initial changes before the named branch are technically on the default branch, but does that mean they will be heads until that Feature1 branch is merged?

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  • changing the serialization procedure for a graph of objects (.net framework)

    - by pierusch
    Hello I'm developing a scientific application using .net framework. The application depends heavily upon a large data structure (a tree like structure) that has been serialized using a standard binaryformatter object. The graph structure looks like this: <serializable()>Public class BigObjet inherits list(of smallObject) end class <serializable()>public class smallObject inherits list(of otherSmallerObjects) end class ... The binaryFormatter object does a nice job but it's not optimized at all and the entire data structure reaches around 100Mb on my filesystem. Deserialization works too but it's pretty slow (around 30seconds on my quad core). I've found a nice .dll on codeproject (see "optimizing serialization...") so I wrote a modified version of the classes above overriding the default serialization/deserialization procedure reaching very good results. The problem is this: I can't lose the data previosly serialized with the old version and I'd like to be able to use the new serialization/deserialization method. I have some ideas but I'm pretty sure someone will be able to give me a proper and better advice ! use an "helper" graph of objects who takes care of the entire serialization/deserialization procedure reading data from the old format and converting them into the classes I nedd. This could work but the binaryformatter "needs" to know the types being serialized so........ :( modify the "old" graph to include a modified version of serialization procedure...so I'll be able to deserialize old file and save them with the new format......this doesn't sound too good imho. well any help will be higly highly appreciated :)

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  • Fast path cache generation for a connected node graph

    - by Sukasa
    I'm trying to get a faster pathfinding mechanism in place in a game I'm working on for a connected node graph. The nodes are classed into two types, "Networks" and "Routers." In this picture, the blue circles represent routers and the grey rectangles networks. Each network keeps a list of which routers it is connected to, and vice-versa. Routers cannot connect directly to other routers, and networks cannot connect directly to other networks. Networks list which routers they're connected to Routers do the same I need to get an algorithm that will map out a path, measured in the number of networks crossed, for each possible source and destination network excluding paths where the source and destination are the same network. I have one right now, however it is unusably slow, taking about two seconds to map the paths, which becomes incredibly noticeable for all connected players. The current algorithm is a depth-first brute-force search (It was thrown together in about an hour to just get the path caching working) which returns an array of networks in the order they are traversed, which explains why it's so slow. Are there any algorithms that are more efficient? As a side note, while these example graphs have four networks, the in-practice graphs have 55 networks and about 20 routers in use. Paths which are not possible also can occur, and as well at any time the network/router graph topography can change, requiring the path cache to be rebuilt. What approach/algorithm would likely provide the best results for this type of a graph?

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  • How do we keep dependent data structures up to date?

    - by Geo
    Suppose you have a parse tree, an abstract syntax tree, and a control flow graph, each one logically derived from the one before. In principle it is easy to construct each graph given the parse tree, but how can we manage the complexity of updating the graphs when the parse tree is modified? We know exactly how the tree has been modified, but how can the change be propagated to the other trees in a way that doesn't become difficult to manage? Naturally the dependent graph can be updated by simply reconstructing it from scratch every time the first graph changes, but then there would be no way of knowing the details of the changes in the dependent graph. I currently have four ways to attempt to solve this problem, but each one has difficulties. Nodes of the dependent tree each observe the relevant nodes of the original tree, updating themselves and the observer lists of original tree nodes as necessary. The conceptual complexity of this can become daunting. Each node of the original tree has a list of the dependent tree nodes that specifically depend upon it, and when the node changes it sets a flag on the dependent nodes to mark them as dirty, including the parents of the dependent nodes all the way down to the root. After each change we run an algorithm that is much like the algorithm for constructing the dependent graph from scratch, but it skips over any clean node and reconstructs each dirty node, keeping track of whether the reconstructed node is actually different from the dirty node. This can also get tricky. We can represent the logical connection between the original graph and the dependent graph as a data structure, like a list of constraints, perhaps designed using a declarative language. When the original graph changes we need only scan the list to discover which constraints are violated and how the dependent tree needs to change to correct the violation, all encoded as data. We can reconstruct the dependent graph from scratch as though there were no existing dependent graph, and then compare the existing graph and the new graph to discover how it has changed. I'm sure this is the easiest way because I know there are algorithms available for detecting differences, but they are all quite computationally expensive and in principle it seems unnecessary so I'm deliberately avoiding this option. What is the right way to deal with these sorts of problems? Surely there must be a design pattern that makes this whole thing almost easy. It would be nice to have a good solution for every problem of this general description. Does this class of problem have a name?

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