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• hyperv machine guest loads slow

  - by Dani Avni

  this is by far one of the strangest things I have seen. I have a win 2008R2 cluster with a CSV. the CSV itself is on an iSCSI storage (hitachi HUS 110) basic config of the two hosts in the cluster is Dell R610 Win 2008 R2 with all patches 64GB 1 NIC for host access 2 NICs for guest access 2 NICs for iSCSI these machine work great and I can load a 2008R2 test guest machine on them in less than 90 seconds after the above config is running for over a year, I now need to add a new host. now the host is Dell R620 (Still intel but different CPU) Win 2008 R2 with all patches 64GB 1 NIC for host access 2 NICs for guest access 2 NICs for iSCSI I added this new host to the domain and to the cluster, I gave it access to the CSV and I tried loading the same guest machine that loads in 90 seconds in the other hosts. the machine loads in about 6 minutes. no matter how many times I try this the old hosts load the machine in about 90 seconds and this new host in around 6 minutes to eliminate any problems with the iSCSI connection, I added a new LUN and directly accessed it from the new host and I was working at around 300MB/s so no problem there. I also tested the connection between the other hosts and the new one and network is working fine there too. to eliminate problems in HyperV, I copied the machine to the local disk of the new host and it loaded in less than 20 seconds. now is the point were things get a lot stranger: in my tests I tried installing a fresh windows guest machine to the CSV from the new host. I noticed that while the fresh windows was installing, my test guest was loading in less than 90 seconds even on the new host (I repeated this a few times). If I paused the fresh install guest and tried loading the test guest again it loaded in 6 minutes. and again after I resumed the guest installation the test guest loaded fast. after the fresh windows was also loaded, I ran tests loading the fresh window and my test machine. each one of them loaded in about 5 minutes when I tried loading them separately. however when I started both of them in the same time they both loaded in around 2.5 minutes it seems that the iSCSI disk access is only working if it is under some load (although I never got to above 10% utilization according to the task manager) does anyone have any idea what could be the problem?

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• VNC connection via SSH proxy machine

  - by pufferfish

  I would like to make a VNC connection from home to a Windows machine at work. The Windows machine is not accessible from the outside, but there is a Linux box that does have port 22 open, so it would seem that this can be done. I suspect it's just a command that "forwards" connections to port 22 on the Linux machine to the Windows machine? Just can't find an example that does exactly this though Thanks in advance!

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• VNC connection through machine with only SSH port open

  - by pufferfish

  I would like to make a VNC connection from home to a Windows machine at work. The Windows machine is not accessible from the outside, but there is a Linux box that does have port 22 open, so it would seem that this can be done. I suspect it's just a command that "forwards" connections to port 22 on the Linux machine to the Windows machine? Just can't find an example that does exactly this though Thanks in advance!

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• how do I copy from a remote linux machine to a local linux machine?

  - by leonbnu

  I sshed to a remote machine and want to copy some files from there to my local machine. Both are running linux. My local machine is behind a firewall, so I can't do "scp file_on_remote user@localmachine". I know I can do "scp user@remotemachine:/directory/file ./", but I need to wander around on the remote server to pick some files to download to local machine, so this way doesn't seem too appealing to me.

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• How to monitor an XP machine

  - by Phenom

  I have a Windows 7 machine and XP machine on the same router. If someone is using the XP machine, how can I see what they're doing from my Windows 7 machine?

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• Can we run windowservice or EXE in Azure website or in Virtual Machine?

  - by Arun Rana

  I have experienced with cloud service/hosted service on Azure. However regarding another project i am confused in selection in terms of functionalities. I have project (2 tier asp.net app) with that i need to run windowservice or exe which will do some functionality every day (like fetch data) so my confusions are as below Regarding Azure website Can i access RDP if i'll move to reserved instance? can i run windowservice/exe ? Regarding Virtual Machine Is it same as dedicated server? can i use WASD as database from application reside in same? I think i can run any exe and installed anything however azure is going to recycle this and if yes then what happened on recycling? can i use new window server 2012 (VHD) in that? Azure website & VM both are in preview mode so is it reliable to use it as production version?

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• In a virtual machine monitor such as VMware's ESXi Server, how are shadow page tables implemented?

  - by ali01

  My understanding is that VMMs such as VMware's ESXi Server maintain shadow page tables to map virtual page addresses of guest operating systems directly to machine (hardware) addresses. I've been told that shadow page tables are then used directly by the processor's paging hardware to allow memory access in the VM to execute without translation overhead. I would like to understand a bit more about how the shadow page table mechanism works in a VMM. Is my high level understanding above correct? What kind of data structures are used in the implementation of shadow page tables? What is the flow of control from the guest operating system all the way to the hardware? How are memory access translations made for a guest operating system before its shadow page table is populated? How is page sharing supported? Short of straight up reading the source code of an open source VMM, what resources can I look into to learn more about hardware virtualization?

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• How to remove CRUD operations from Entity Class

  - by GlutVonSmark

  Trying to get my head around removing dataStore access from my entity classes. Lets say I have an AccountsGroup entity class. I put the all DBAccess into AccountsGroupRepository class. Now should I have a DeleteFromDB method in the AccountsGroup class, that will call the repository? Public Sub DeleteFromDB dim repository as new AccountsGroupRepository(me) repository.DelteFromDB End Sub Or should I just always use repositry whenever I need to delete an entity, and not have the CRUD methods in the entity class? What happens when there is some business logic validation that needs to be done before the delete can proceed. For example if AccountsGroup still has some Accounts in it the delete method should throw an exception. Where do I put that?

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• Don’t Sleep Keeps Your Windows Machine Awake

  - by ETC

  Don’t Sleep is an ultra lightweight and portable application that fills a niche need perfect: sometimes you need to temporarily keep your Windows machine from shutting down or power saving without making any permanent changes to your power profile. Fire up portable Don’t Sleep and tell it how long you want it to stop your computer from shutting down, going to sleep (standby/hibernation), and/or keeping the monitor on. At the end of the monitoring period you can have it turn itself off, stay on but stop blocking, or shut down your computer. It’s a great application for those times you need to alter how your computer handles hibernation mode, activating the screensaver, or other automated tasks without making any permanent changes to your power profile or other settings. Hit up the link below to read more and grab a copy. Don’t Sleep is freeware, Windows only. Don’t Sleep [via The Portable Freeware Collection] Latest Features How-To Geek ETC Have You Ever Wondered How Your Operating System Got Its Name? Should You Delete Windows 7 Service Pack Backup Files to Save Space? What Can Super Mario Teach Us About Graphics Technology? Windows 7 Service Pack 1 is Released: But Should You Install It? How To Make Hundreds of Complex Photo Edits in Seconds With Photoshop Actions How to Enable User-Specific Wireless Networks in Windows 7 Access the Options for Your Favorite Extensions Easier in Firefox Don’t Sleep Keeps Your Windows Machine Awake DropSpace Syncs Android Files to Dropbox Field of Poppies Wallpaper The History Of Operating Systems [Infographic] DriveSafe.ly Reads Your Text Messages Aloud

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• Automated “ubuntu-12.04.1-server-amd64” OS installation on physical machine

  - by user285336

  We are using Physical server and are in process of Automated “ubuntu-12.04.1-server-amd64” OS installation on it. There are two HDD for OS installation purpose and there are RAID1 relation between them. This setup has been done through BIOS. The kickstart configuration file looks like this: #Generated by Kickstart Configurator #platform=AMD64 or Intel EM64T #System language lang en_US #Language modules to install langsupport en_US #System keyboard keyboard us #System mouse mouse #System timezone timezone Asia/Dili #Root password rootpw --iscrypted $1$Yl1QJyta$KzIT.kq3i9E5XaiQKcUJn/ #Initial user user ankit --fullname "Ankit" --iscrypted --password $1$c6Yflpea$pi1QQ59/jgywmGwBv25z3/ #Reboot after installation reboot #Use text mode install text #Install OS instead of upgrade install #Use Web installation url --url my_repo_location #System bootloader configuration bootloader --location=mbr #Clear the Master Boot Record zerombr yes #Partition clearing information clearpart --all --initlabel #Disk partitioning information part /boot --fstype ext4 --size 100 --ondisk sda part / --fstype ext4 --size 10000 --ondisk sda part /var --fstype ext4 --size 10000 --ondisk sda part swap --size 1024 --ondisk sdb #System authorization infomation auth --useshadow --enablemd5 #Network information network --bootproto=dhcp --device=eth0 #Firewall configuration firewall --enabled --trust=eth0 --http --ftp --ssh --telnet --smtp #X Window System configuration information xconfig --depth=8 --resolution=640x480 --defaultdesktop=GNOME But I am getting the below error : No root file system is defined Please suggest on this. Do we need to do any modification in kickstart configuration file. Any help in this regard will be very helpful for us. The automated Ubuntu OS installation is successful in Virtual Machine(VM) with the above ks.cfg (kickstart configuration file ) but failing in case of physical machine. Please suggest on this and if possible provide the new ks.cfg file to resolve above problem. Thanks & Regards, Rajesh Prasad

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• Progressive Enhancement vs. Single Page Apps

  - by SeanPlusPlus

  I just got back from a conference in Boston called An Event Apart. A really popular theme amongst the speakers was the idea of progressive enhancement - a site's content should go in the HTML, and JavaScript should only be used to enhance behavior. The arguments that the speakers gave for progressive enhancement were very compelling. Not only is it a solid pattern for supporting older browsers, and devices on a network with low bandwidth, but HTML fails much more gracefully than JavaScript (i.e. markup that is not supported is just ignored, while if a browser throws an exception while executing your script - you are hosed). Jeremy Keith gave a particularly insightful talk about this. But what about single page web apps like Backbone and Angular? The whole design behind these frameworks seems to push the developer toward moving content out of the HTML, and into something like a JSON API. I can not seem to gel these two design patterns: progressive enhancement vs. single page web apps. Are there instances when one is better than the other? Or are they not even antagonistic technologies, and I am missing something here with my mental model?

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• Integrating different branches from external sources into a single Mercurial repository

  - by dukeofgaming

  I'm currently working in a company using Perforce and am making way for distributed version control with Mercurial. I've had success importing Perforce history using the perfarce (quite a suitable name, I laugh every time I see/say it) however, this only works with a single branch at a time. Here's how my P4 integration setup works: In perforce, create a "client", which is kind of a description of what you will be constantly updating/checking-out. This can only address one branch at a time (trunk or other). Once you do this, run hg clone p4://<server>/<client_name> Go to .hg/hgrc and put the perforce path line: perforce = p4://<server>/<client_name> Work normally with the code under mercurial, do hg pull perforce to sync up, hg push to export a changelist What I'd like to be able to do is have a perforce path per branch and have everything work in the same repository. Now, pushing is not a problem, however, if I pull the history from another branch it would end up at the default branch. I'd like to be able to do something like hg pull perforce-R5 and have it land in mercurial's R5 branch. Even if I have no merging history, it would be sweet enough to be able to preserve it. There are also other plugins for CVCSs that let you integrate mercurial, but AFAIK the subversion one has the same problem. I don't think there is a straight-through way of doing this, but as long as I could automate the process with some hooks and scripts in a single Mercurial machine, that would be good enough.

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• Back up a single table in SQL Server

  - by BuckWoody

  SQL Server doesn’t have an easy way to take a table backup, so I often use the bcp (Bulk Copy Program) to accomplish the same goal. I’ve mentioned this before, and someone told me when they tried it they couldn’t restore the table – ah the dangers of telling people half the information! I should have mentioned that you need to have a “format file” ready if the table does not exist at the destination. In my case I already had the table, in this person’s case they did not. The format file can be used to rebuild that table structure before the data is bcp’d in, and you can read more about it here: http://msdn.microsoft.com/en-us/library/ms191516.aspx There’s another way to back up a table, and that’s to create a Filegroup and place the table there. Then you can take a Filegroup backup to back up a single table. Of course, there are other methods of moving a single table’s data in an out, including SQL Server Integration Services and even the older Data Transformation Services, or simply by using hte SQLCMD or PowerShell utilities to run a query and just save the output to a file. In fact, these days I’m using a PowerShell script to build INSERT statements from that query. That could also easily be modified to create the table structure (or modify one if needed) quite easily. Share this post: email it! | bookmark it! | digg it! | reddit! | kick it! | live it!

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• Installed on a machine with EFI and after installation, it says the disk is not bootable

  - by Roy Hocknull

  I installed Ubuntu 11.10 and the installation runs through fine. It then says reboot, and the machine says 'inserts a boot disk' which means the hard disk isn't bootable. The primary hard disk is an EFI device, and nothing seems to work. The machine in question is an Acer Aspire M3970 desktop. Core i5 2300, with 8Gb Ram. Main boot drive is an SSD (Vertex 2E 60Gb). I am trying to install the 11.10 x64 version. The installation I have tried from CD and USB stick. It goes through the install, allows you to partition the drives then installs all the packages. At the end it goes for a reboot, and asks you to remove the installation media. The PC then restarts and says no bootable disk. I tried it many times. In the end I have installed Fedora 15 x64 which works straight away with no messing. Unless this issues is fixed I have to drop 11.10 as a viable option. From my experience F15 isn't quite as polished as Ubuntu, but in this case - it works!! Is this a widespread problem or am I unique?

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• VirtualBox : increase hard disk size of the virtual machine

  - by wim

  I have run out of space on my WinXP virtual machine, which I only gave 10 GB space for when I created it. Is there an easy way to increase it to, say, 20 GB? I can't see any obvious option in VirtualBox settings. edit: the suggestion below gives this error wim@wim-ubuntu:/media/data/winxp_vm$ VBoxManage modifyhd wim.vdi --resize 20000 VBoxManage: error: Cannot register the hard disk '/media/data/winxp_vm/wim.vdi' {46284957-2c09-4e70-8a49-bfbe0f7f681d} because a hard disk '/home/wim/VirtualBox VMs/winxp_vm/wim.vdi' with UUID {46284957-2c09-4e70-8a49-bfbe0f7f681d} already exists VBoxManage: error: Details: code NS_ERROR_INVALID_ARG (0x80070057), component VirtualBox, interface IVirtualBox, callee nsISupports Context: "OpenMedium(Bstr(pszFilenameOrUuid).raw(), enmDevType, AccessMode_ReadWrite, fForceNewUuidOnOpen, pMedium.asOutParam())" at line 210 of file VBoxManageDisk.cpp edit2: removing the .vdi from VirtualBox before calling VBoxManage command, then adding it back in, was successful. But now I can't boot the virtual machine, I get this worrying screen: By the way, it says FATAL: Could not read from the boot medium! System halted. edit3: The vdi must be reattached to the VM after VBoxManage command. Further, the partition will need to be resized from WITHIN windows, because you will have this empty space: I was able to resize the partition easily using a bit of freeware called EASEUS Partition Master 9.1.0 Home Edition.

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• MySQL – Grouping by Multiple Columns to Single Column as A String

  - by Pinal Dave

  In this post titled SQL SERVER – Grouping by Multiple Columns to Single Column as A String we have seen how to group multiple column data in comma separate values in a single row grouping by another column by using FOR XML clause. In this post we will see how we can produce the same result using the GROUP_CONCAT function in MySQL. Let us create the following table and data. CREATE TABLE TestTable (ID INT, Col VARCHAR(4)); INSERT INTO TestTable (ID, Col) SELECT 1, 'A' UNION ALL SELECT 1, 'B' UNION ALL SELECT 1, 'C' UNION ALL SELECT 2, 'A' UNION ALL SELECT 2, 'B' UNION ALL SELECT 2, 'C' UNION ALL SELECT 2, 'D' UNION ALL SELECT 2, 'E'; Now to generate csv values of the column col for each ID, use the following code SELECT ID, GROUP_CONCAT(col) AS CSV FROM TestTable GROUP BY ID; The result is ID CSV 1 A,B,C 2 A,B,C,D,E You can also change the delimiters. For example instead of comma, if you want to have a pipe symbol (|), use the following SELECT ID, REPLACE(GROUP_CONCAT(col),',','|') AS CSV FROM TestTable GROUP BY ID; The result is ID CSV 1 A|B|C 2 A|B|C|D|E MySQL makes this very simple with its support of GROUP_CONCAT function. Reference: Pinal Dave (http://blog.sqlauthority.com)Filed under: PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, T SQL

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• Partner Webcast – Oracle Exadata X3 Database In-Memory Machine - Next-Generation Technologies Update - 20 Dec 2012

  - by Thanos

  Oracle’s next-generation database machine, Oracle Exadata X3, combines massive memory and low-cost disks to deliver even faster performance and greater storage capabilities at the lowest cost, making it the ideal database platform for the varied and unpredictable workloads of cloud computing. Oracle Exadata is available in multiple configurations including a low-cost eighth-rack configuration, so you can start small and grow at your own pace. We have also introduced new migration services designed to streamline implementation thereby saving you time and money. If your IT department is expected to deliver business value—or even drive business growth—then you’ll want to join us for a live Webcast discussing how the new Oracle Exadata X3 can help you transform data management.  Agenda: Oracle Exadata Evolution Oracle Exadata X3 Database In-Memory Machine Hardware Update Software Update Exadata Unique Next Generation Technologies Getting on board Oracle Exadata Q&A Delivery Format This FREE online LIVE eSeminar will be delivered over the Web. Registrations received less than 24hours prior to start time may not receive confirmation to attend. Thursday, December 20th, 10am CET (9am GMT) Duration: 1 hour Register Now! For any questions please contact us at [email protected] Visit our ISV Migration Center blog Or Follow us @oracleimc to learn more on Oracle Technologies, upcoming partner webcasts and events. Existing content available YouTube - SlideShare - Oracle Mix.

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• When does the "Do One Thing" paradigm become harmful?

  - by Petr

  For the sake of argument here's a sample function that prints contents of a given file line-by-line. Version 1: void printFile(const string & filePath) { fstream file(filePath, ios::in); string line; while (file.good()) { getline(file, line); cout << line << endl; } } I know it is recommended that functions do one thing at one level of abstraction. To me, though code above does pretty much one thing and is fairly atomic. Some books (such as Robert C. Martin's Clean Code) seem to suggest breaking the above code into separate functions. Version 2: void printLine(const string & line) { cout << line << endl; } void printLines(fstream & file) { string line; while (file.good()) { getline(file, line); printLine(line); } } void printFile(const string & filePath) { fstream file(filePath, ios::in); printLines(file); } I understand what they want to achieve (open file / read lines / print line), but isn't it a bit of overkill? The original version is simple and in some sense already does one thing - prints a file. The second version will lead to a large number of really small functions which may be far less legible than the first version. Wouldn't it be, in this case, better to have the code at one place? At which point does the "Do One Thing" paradigm become harmful?

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• Questions about identifying the components in MVC

  - by luiscubal

  I'm currently developing an client-server application in node.js, Express, mustache and MySQL. However, I believe this question should be mostly language and framework agnostic. This is the first time I'm doing a real MVC application and I'm having trouble deciding exactly what means each component. (I've done web applications that could perhaps be called MVC before, but I wouldn't confidently refer to them as such) I have a server.js that ties the whole application together. It does initialization of all other components (including the database connection, and what I think are the "models" and the "views"), receiving HTTP requests and deciding which "views" to use. Does this mean that my server.js file is the controller? Or am I mixing code that doesn't belong there? What components should I break the server.js file into? Some examples of code that's in the server.js file: var connection = mysql.createConnection({ host : 'localhost', user : 'root', password : 'sqlrevenge', database : 'blog' }); //... app.get("/login", function (req, res) { //Function handles a GET request for login forms if (process.env.NODE_ENV == 'DEVELOPMENT') { mu.clearCache(); } session.session_from_request(connection, req, function (err, session) { if (err) { console.log('index.js session error', err); session = null; } login_view.html(res, user_model, post_model, session, mu); //I named my view functions "html" for the case I might want to add other output types (such as a JSON API), or should I opt for completely separate views then? }); }); I have another file that belongs named session.js. It receives a cookies object, reads the stored data to decide if it's a valid user session or not. It also includes a function named login that does change the value of cookies. First, I thought it would be part of the controller, since it kind of dealt with user input and supplied data to the models. Then, I thought that maybe it was a model since it dealt with the application data/database and the data it supplies is used by views. Now, I'm even wondering if it could be considered a View, since it outputs data (cookies are part of HTTP headers, which are output)

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• Level and Player objects - which should contain which?

  - by Thane Brimhall

  I've been working on a several simple games, and I've always come to a decision point where I have to choose whether to have the Level object as an attribute of the Player class or the Player as an attribute of the Level class. I can see arguments for both: The Level should contain the player because it also contains every other entity. In fact it just makes sense this way: "John is in the room." It makes it a bit more difficult to move the player to a new level, however, because then each level has to pass its player object to an upcoming level. On the other hand, it makes programming sense to me to leave the player as the top-level object that is persistent between levels, and the environment changes because the player decides to change his level and location. It becomes very easy to change levels, because all I have to do is replace the level variable on the player. What's the most common practice here? Or better yet, is there a "right" way to architecture this relationship?

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• Customers Deploying Sun Oracle Database Machine

  - by kimberly.billings

  Philippine Savings Bank (PS Bank) recently deployed the Sun Oracle Database Machine to underpin its enterprise-wide analytics platform. Now, the response times for queries and requests that used to take from three hours to several days is completed in less than one minute with near real-time updates. Read the press release. EFU General Insurance also announced this week that they have deployed the Sun Oracle Database Machine. With Oracle, EFU will be able to open more sales channels via the Web and facilitate integration with other companies. As a result, more quality services can be offered to its customers via the Web because of the more agile and reliable IT infrastructure. In addition, a centralized IT environment will offer the EFU management a real time view of key information, enabling EFU to analyze business trends and make timely decisions. Read the press release. Let us know about your Sun Oracle Database deployment! var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www."); document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E")); try { var pageTracker = _gat._getTracker("UA-13185312-1"); pageTracker._trackPageview(); } catch(err) {}

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• GCC: assembly listing for IA64 without an Itanium machine

  - by KD04

  I need to try the following thing: I would like to compile some simple C code samples and see the assembly listing generated by GCC for IA64 architecture, i.e. I just want to run GCC with the -S switch and see the resultant .s file. I don't have an Itanium machine, so in order to do it myself I'll probably need a cross-compiling version of GCC built for x86 RedHat. I'm not interested in full cross-compilation, meaning that I don't need to generate the binaries at all. The easiest way, of course, would be to find an Itanium machine with with GCC and just try it there. Unfortunately, I don't seem to have access to any. Another option is to build a cross-compiling version GCC on my RedHat, but apparently that's quite an endeavor for someone who hasn't done it before (I assume that the fact that I only need .s output doesn't make it simpler). What other options are there, if any? Maybe there's some sort of a web front to an Itanium GCC compiler on the Net (something like Comeau Online or ideone.com, but with .s output)? Anything else? I would appreciate any help.

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• Client/Server game even in solo: any big problem?

  - by Klaim

  I'm making a game which have strong basic design based on multiplayer but also should provide a really interesting and self-sufficient solo game. A bit like a real-time strategy game. The events and actions taken shouldn't be as massive and immediate as in a FPS, so you can also think the networking like for an RTS. It's a PC game, targetting Windows, MacOSX and Linux (Ubuntu & Fedora). It's programmed in C++, using a variety of open source libraries, so I have great (potential) control over the performances. So far I always considered that just making the game work with two applications, client & server, even in solo mode was ok. However, as I'm in the process of starting the network code I'm having doubts about if it's a good idea. I'm not a specialist so I might be missing something in my analysis. I see these pros and cons: Pros: The game works only one way so if I fix a bug it should apply on all game modes, whatever the distance with the server is; Basic networking issues would be detected early, including behaviour with the protection softwares (firewall) installed (i am not specialist so this might be wrong); Cons: I suppose that even if it should be really fast enough, networking client and server on the same computer would still be slower than no networking and message passing in (one) process memory. Maybe debugging would be more difficult? I don't have experience in this case but so far I assume that debugging with Visual Studio allows me to debug multiple process so it shouldn't be really different. Also, remote debugging. My question is: is there a big disadvantage that I missed? Or maybe there are advantages that I missed and that should encourage me to just continue with only client-server game sessions?

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• should I create a new class for a specific piece of business logic?

  - by Riz

  I have a Request class based on the same Entity in my Domain. It currently only has property definitions. I'd like to add a method for checking a duplicate Request which I'll call from my controller. Should I add a method called CheckDuplicate in the Request class? Would I be violating the SRP? The method will need to access a database context to check already existing requests. I'm thinking creating another class altogether for this logic that accepts a datacontext as part of its constructor. But creating a whole new class for just one method seems like a waste too. Any advice?

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• Dynamic State Machine in Ruby? Do State Machines Have to be Classes?

  - by viatropos

  Question is, are state machines always defined statically (on classes)? Or is there a way for me to have it so each instance of the class with has it's own set of states? I'm checking out Stonepath for implementing a Task Engine. I don't really see the distinction between "states" and "tasks" in there, so I'm thinking I could just map a Task directly to a state. This would allow me to be able to define task-lists (or workflows) dynamically, without having to do things like: aasm_event :evaluate do transitions :to => :in_evaluation, :from => :pending end aasm_event :accept do transitions :to => :accepted, :from => :pending end aasm_event :reject do transitions :to => :rejected, :from => :pending end Instead, a WorkItem (the main workflow/task manager model), would just have many tasks. Then the tasks would work like states, so I could do something like this: aasm_initial_state :initial tasks.each do |task| aasm_state task.name.to_sym end previous_state = nil tasks.each do |tasks| aasm_event task.name.to_sym do transitions :to => "#{task.name}_phase".to_sym, :from => previous_state ? "#{task.name}_phase" : "initial" end previous_state = state end However, I can't do that with the aasm gem because those methods (aasm_state and aasm_event) are class methods, so every instance of the class with that state machine has the same states. I want it so a "WorkItem" or "TaskList" dynmically creates a sequence of states and transitions based on the tasks it has. This would allow me to dynamically define workflows and just have states map to tasks. Are state machines ever used like this?

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