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  • Resuming File Downloads in Ruby on Rails

    - by jaycode
    Hi, this has been asked here: http://stackoverflow.com/questions/1840413/resuming-file-downloads-in-ruby-on-rails-range-header-support But there was no answer. I am having similar problem, could anybody help, please? Thanks before. Alright I am getting close. Seems like I need to setup header Content-Length or Content-Range, as described here: http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.13. Haven't got an idea how. Anybody knows? Jay response.header["Content-Range"] = "20000-#{size}" send_file "#{Dir.pwd}/products/filename.zip", :type => 'application/zip', :size => (size - 20000) doesn't work

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  • NoSQL as file meta database

    - by fga
    I am trying to implement a virtual file system structure in front of an object storage (Openstack). For availability reasons we initially chose Cassandra, however while designing file system data model, it looked like a tree structure similar to a relational model. Here is the dilemma for availability and partition tolerance we need NoSQL, but our data model is relational. The intended file system must be able to handle filtered search based on date, name etc. as fast as possible. So what path should i take? Stick to relational with some indexing mechanism backed by 3 rd tools like Apache Solr or dig deeper into NoSQL and find a suitable model and database satisfying the model? P.S: Currently from NoSQL Cassandra or MongoDB are choices proposed by my colleagues.

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  • How to organize my site's file system properly?

    - by Wolfpack'08
    Doing some reading on Stack Overflow, I've found a lot of information suggesting that proper organization of a file system is crucial to a well-written web app. One of the key pieces of evidence is high-frequency references to "separation of concerns" in questions related to keeping programs organized. Now, I've found some information on organizing file systems (Filesystem Hierarchy Standard) from 2004. It raises only two concerns: first, the standard's a bit dated, so I believe it may be possible to do better given the changes in technology over the past 8 years; second, and most important, my application is very small compared to an entire Linux distro. I think that the file system should be organized very differently because of that. Here's what I'm looking at, currently: /scripts, /databases, /www -> /dev, /production -> login, router, admin pages, /sites -> content types, static pages /modules, /includes, /css, /media -> /module-specific-media

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  • Does this file format exist?

    - by Jon Chase
    Is there a file format that handles the following use case... I'd like to create a tar file (or whatever - I'm just using tar here b/c it's a well known file format for containing multiple files) that would be usable even if I only had access to specific chunks of said file. For example, say I tar up my mp3 and photo collection into a 100GB tar file, then put the file into some long term storage somewhere. Later, I want to access a specific mp3 file. I don't want to download the entire 100GB tar file just to get to one mp3. In fact, let's say I can't download the entire 100GB tar file. Instead, I'd like to say "give me megabytes 10 through 19 of the 100GB tar file" and then have the mp3 magically extracted from those 10 megabytes. Does a file format like this exist?

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  • Foremost custom file type not accepted by -t argument

    - by Channel72
    I'm trying to recover a deleted file on an ext3 file system using the foremost utility. The file I want to recover is a hpp C++ source code file. However, foremost does not automatically support the hpp file extension, so I have to add it to the config file. So, following the instructions on the man page, I add the following line to the config file: hpp n 50000 include include ASCII Then I run foremost as follows: $foremost -v -T -t hpp -i /dev/md0 -o /home/recover/ Instead of doing anything, it just displays the help message. If I change the hpp to htm or jpg, it works. So apparently foremost isn't accepting the custom file type I added into the config file. But I've looked over this dozens of times now, and I can't see what I'm doing wrong. I'm following the instructions exactly. Why doesn't foremost recognize the new file type I added to the config file?

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  • Windows file Sync

    - by Deane Venske
    So I have a big problem at the moment. Trying to find a reliable solution for syncing 2 windows IIS servers. I need to keep the web content imaged on both. Now I have been trying to use Rsync to this point, but unfortunately file permission errors are a nightmare to manage this way. I'm testing out dropbox, but the performance sucks. I'm more familiar with Linux stuff and I've used Rsync in the past but isn't there a native windows solution that will work?

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  • Error with SQL Server Setup 2012 on Windows 2012

    - by Jeff
    I am trying to install SQL Server on Windows 2012. I was able to finally get the wizard up and running after making some changes on the server, but now it fails no matter what I do with the following error: TITLE: SQL Server Setup failure. SQL Server Setup has encountered the following error: There is an error in XML document (108, 148).. For help, click: http://go.microsoft.com/fwlink?LinkID=20476&ProdName=Microsoft%20SQL%20Server&EvtSrc=setup.rll&EvtID=50000&EvtType=0x066FCAFD%25400x5539C151 LinkID: 20476 Product Name: Microsoft SQL Server Message Source setup.rll Message ID: 50000 EvtType: 0x066FCAFD%400x5539C151 What I've tried: Installing from commandline with /q Result from CL installation: Error result: -2147467259 Result facility code: 0 Result error code: 16389 Please review the summary.txt log for further details The Verbose CL installation reveals: Sco: File 'C:\SQL Install\1033_ENU_LP\x64\setup\x64\sql_bids_loc.msi' does not exist Sco: File 'C:\SQL Install\1033_ENU_LP\x64\setup\x64\sql_bids_loc.msi' does not exist Package ID sql_bids_loc_Cpu64_1033: NotInstalled Sco: File 'C:\SQL Install\1036_FRA_LP\x64\setup\x64\sql_bids_loc.msi' does not exist Sco: File 'C:\SQL Install\1036_FRA_LP\x64\setup\x64\sql_bids_loc.msi' does not exist Package ID sql_bids_loc_Cpu64_1036: NotInstalled Sco: File 'C:\SQL Install\1040_ITA_LP\x64\setup\x64\sql_bids_loc.msi' does not exist Sco: File 'C:\SQL Install\1040_ITA_LP\x64\setup\x64\sql_bids_loc.msi' does not exist Package ID sql_bids_loc_Cpu64_1040: NotInstalled Sco: File 'C:\SQL Install\1041_JPN_LP\x64\setup\x64\sql_bids_loc.msi' does not exist Sco: File 'C:\SQL Install\1041_JPN_LP\x64\setup\x64\sql_bids_loc.msi' does not exist Package ID sql_bids_loc_Cpu64_1041: NotInstalled Sco: File 'C:\SQL Install\1042_KOR_LP\x64\setup\x64\sql_bids_loc.msi' does not exist Sco: File 'C:\SQL Install\1042_KOR_LP\x64\setup\x64\sql_bids_loc.msi' does not exist Package ID sql_bids_loc_Cpu64_1042: NotInstalled Sco: File 'C:\SQL Install\1046_PTB_LP\x64\setup\x64\sql_bids_loc.msi' does not exist Sco: File 'C:\SQL Install\1046_PTB_LP\x64\setup\x64\sql_bids_loc.msi' does not exist Package ID sql_bids_loc_Cpu64_1046: NotInstalled Sco: File 'C:\SQL Install\1049_RUS_LP\x64\setup\x64\sql_bids_loc.msi' does not exist Sco: File 'C:\SQL Install\1049_RUS_LP\x64\setup\x64\sql_bids_loc.msi' does not exist Package ID sql_bids_loc_Cpu64_1049: NotInstalled Sco: File 'C:\SQL Install\2052_CHS_LP\x64\setup\x64\sql_bids_loc.msi' does not exist Sco: File 'C:\SQL Install\2052_CHS_LP\x64\setup\x64\sql_bids_loc.msi' does not exist Package ID sql_bids_loc_Cpu64_2052: NotInstalled Sco: File 'C:\SQL Install\3082_ESN_LP\x64\setup\x64\sql_bids_loc.msi' does not exist Sco: File 'C:\SQL Install\3082_ESN_LP\x64\setup\x64\sql_bids_loc.msi' does not exist Package ID sql_bids_loc_Cpu64_3082: NotInstalled Sco: File 'C:\SQL Install\1053_SVE_LP\x64\setup\x64\sql_bids_loc.msi' does not exist Sco: File 'C:\SQL Install\1053_SVE_LP\x64\setup\x64\sql_bids_loc.msi' does not exist Package ID sql_bids_loc_Cpu64_1053: NotInstalled Sco: File 'C:\SQL Install\x64\setup\x64\sql_ssms.msi' does not exist Sco: File 'C:\SQL Install\x64\setup\x64\sql_ssms.msi' does not exist Package ID sql_ssms_Cpu64: NotInstalled Sco: File 'C:\SQL Install\1028_CHT_LP\x64\setup\x64\sql_ssms_loc.msi' does not exist Sco: File 'C:\SQL Install\1028_CHT_LP\x64\setup\x64\sql_ssms_loc.msi' does not exist Package ID sql_ssms_loc_Cpu64_1028: NotInstalled Sco: File 'C:\SQL Install\1031_DEU_LP\x64\setup\x64\sql_ssms_loc.msi' does not exist Sco: File 'C:\SQL Install\1031_DEU_LP\x64\setup\x64\sql_ssms_loc.msi' does not exist Package ID sql_ssms_loc_Cpu64_1031: NotInstalled Sco: File 'C:\SQL Install\1033_ENU_LP\x64\setup\x64\sql_ssms_loc.msi' does not exist Sco: File 'C:\SQL Install\1033_ENU_LP\x64\setup\x64\sql_ssms_loc.msi' does not exist Package ID sql_ssms_loc_Cpu64_1033: NotInstalled Sco: File 'C:\SQL Install\1036_FRA_LP\x64\setup\x64\sql_ssms_loc.msi' does not exist Sco: File 'C:\SQL Install\1036_FRA_LP\x64\setup\x64\sql_ssms_loc.msi' does not exist Package ID sql_ssms_loc_Cpu64_1036: NotInstalled Sco: File 'C:\SQL Install\1040_ITA_LP\x64\setup\x64\sql_ssms_loc.msi' does not exist Sco: File 'C:\SQL Install\1040_ITA_LP\x64\setup\x64\sql_ssms_loc.msi' does not exist Package ID sql_ssms_loc_Cpu64_1040: NotInstalled Sco: File 'C:\SQL Install\1041_JPN_LP\x64\setup\x64\sql_ssms_loc.msi' does not exist Sco: File 'C:\SQL Install\1041_JPN_LP\x64\setup\x64\sql_ssms_loc.msi' does not exist Package ID sql_ssms_loc_Cpu64_1041: NotInstalled Sco: File 'C:\SQL Install\1042_KOR_LP\x64\setup\x64\sql_ssms_loc.msi' does not exist Sco: File 'C:\SQL Install\1042_KOR_LP\x64\setup\x64\sql_ssms_loc.msi' does not exist Package ID sql_ssms_loc_Cpu64_1042: NotInstalled Sco: File 'C:\SQL Install\1046_PTB_LP\x64\setup\x64\sql_ssms_loc.msi' does not exist Sco: File 'C:\SQL Install\1046_PTB_LP\x64\setup\x64\sql_ssms_loc.msi' does not exist Package ID sql_ssms_loc_Cpu64_1046: NotInstalled Sco: File 'C:\SQL Install\1049_RUS_LP\x64\setup\x64\sql_ssms_loc.msi' does not exist Sco: File 'C:\SQL Install\1049_RUS_LP\x64\setup\x64\sql_ssms_loc.msi' does not exist Package ID sql_ssms_loc_Cpu64_1049: NotInstalled Sco: File 'C:\SQL Install\2052_CHS_LP\x64\setup\x64\sql_ssms_loc.msi' does not exist Sco: File 'C:\SQL Install\2052_CHS_LP\x64\setup\x64\sql_ssms_loc.msi' does not exist Package ID sql_ssms_loc_Cpu64_2052: NotInstalled Sco: File 'C:\SQL Install\3082_ESN_LP\x64\setup\x64\sql_ssms_loc.msi' does not exist Sco: File 'C:\SQL Install\3082_ESN_LP\x64\setup\x64\sql_ssms_loc.msi' does not exist Package ID sql_ssms_loc_Cpu64_3082: NotInstalled Sco: File 'C:\SQL Install\1053_SVE_LP\x64\setup\x64\sql_ssms_loc.msi' does not exist Sco: File 'C:\SQL Install\1053_SVE_LP\x64\setup\x64\sql_ssms_loc.msi' does not exist Package ID sql_ssms_loc_Cpu64_1053: NotInstalled Sco: File 'C:\SQL Install\x64\setup\sql_common_core_msi\x64\sql_common_core.msi' does not e Sco: File 'C:\SQL Install\x64\setup\sql_common_core_msi\x64\sql_common_core.msi' does not e Package ID sql_common_core_Cpu64: NotInstalled Sco: File 'C:\SQL Install\1028_CHT_LP\x64\setup\sql_common_core_loc_msi\x64\sql_common_core Sco: File 'C:\SQL Install\1028_CHT_LP\x64\setup\sql_common_core_loc_msi\x64\sql_common_core Package ID sql_common_core_loc_Cpu64_1028: NotInstalled Sco: File 'C:\SQL Install\1031_DEU_LP\x64\setup\sql_common_core_loc_msi\x64\sql_common_core Sco: File 'C:\SQL Install\1031_DEU_LP\x64\setup\sql_common_core_loc_msi\x64\sql_common_core Package ID sql_common_core_loc_Cpu64_1031: NotInstalled Sco: File 'C:\SQL Install\1033_ENU_LP\x64\setup\sql_common_core_loc_msi\x64\sql_common_core Sco: File 'C:\SQL Install\1033_ENU_LP\x64\setup\sql_common_core_loc_msi\x64\sql_common_core Package ID sql_common_core_loc_Cpu64_1033: NotInstalled Sco: File 'C:\SQL Install\1036_FRA_LP\x64\setup\sql_common_core_loc_msi\x64\sql_common_core Sco: File 'C:\SQL Install\1036_FRA_LP\x64\setup\sql_common_core_loc_msi\x64\sql_common_core Package ID sql_common_core_loc_Cpu64_1036: NotInstalled Sco: File 'C:\SQL Install\1040_ITA_LP\x64\setup\sql_common_core_loc_msi\x64\sql_common_core Sco: File 'C:\SQL Install\1040_ITA_LP\x64\setup\sql_common_core_loc_msi\x64\sql_common_core Package ID sql_common_core_loc_Cpu64_1040: NotInstalled Sco: File 'C:\SQL Install\1041_JPN_LP\x64\setup\sql_common_core_loc_msi\x64\sql_common_core Sco: File 'C:\SQL Install\1041_JPN_LP\x64\setup\sql_common_core_loc_msi\x64\sql_common_core Package ID sql_common_core_loc_Cpu64_1041: NotInstalled Sco: File 'C:\SQL Install\1042_KOR_LP\x64\setup\sql_common_core_loc_msi\x64\sql_common_core Sco: File 'C:\SQL Install\1042_KOR_LP\x64\setup\sql_common_core_loc_msi\x64\sql_common_core Package ID sql_common_core_loc_Cpu64_1042: NotInstalled Sco: File 'C:\SQL Install\1046_PTB_LP\x64\setup\sql_common_core_loc_msi\x64\sql_common_core Sco: File 'C:\SQL Install\1046_PTB_LP\x64\setup\sql_common_core_loc_msi\x64\sql_common_core Package ID sql_common_core_loc_Cpu64_1046: NotInstalled Sco: File 'C:\SQL Install\1049_RUS_LP\x64\setup\sql_common_core_loc_msi\x64\sql_common_core Sco: File 'C:\SQL Install\1049_RUS_LP\x64\setup\sql_common_core_loc_msi\x64\sql_common_core Package ID sql_common_core_loc_Cpu64_1049: NotInstalled Sco: File 'C:\SQL Install\2052_CHS_LP\x64\setup\sql_common_core_loc_msi\x64\sql_common_core Sco: File 'C:\SQL Install\2052_CHS_LP\x64\setup\sql_common_core_loc_msi\x64\sql_common_core Package ID sql_common_core_loc_Cpu64_2052: NotInstalled Sco: File 'C:\SQL Install\3082_ESN_LP\x64\setup\sql_common_core_loc_msi\x64\sql_common_core Sco: File 'C:\SQL Install\3082_ESN_LP\x64\setup\sql_common_core_loc_msi\x64\sql_common_core Package ID sql_common_core_loc_Cpu64_3082: NotInstalled Sco: File 'C:\SQL Install\1053_SVE_LP\x64\setup\sql_common_core_loc_msi\x64\sql_common_core Sco: File 'C:\SQL Install\1053_SVE_LP\x64\setup\sql_common_core_loc_msi\x64\sql_common_core Package ID sql_common_core_loc_Cpu64_1053: NotInstalled Sco: File 'C:\Users\Administrator\AppData\Local\Temp\2\SQL Server 2012\Setup\1033_ENU_LP\x6 lSupport.msi' does not exist Sco: File 'C:\Users\Administrator\AppData\Local\Temp\2\SQL Server 2012\Setup\1033_ENU_LP\x6 lSupport.msi' does not exist Package ID SqlSupport_Cpu64: NotInstalled Sco: File 'C:\SQL Install\redist\watson\x86\dw20shared.msi' does not exist Sco: File 'C:\SQL Install\redist\watson\x86\dw20shared.msi' does not exist Package ID WatsonX86_Cpu32: NotInstalled Package ID sqlncli_Cpu64: NotInstalled Package ID SqlLocalDB_Cpu64: NotInstalled Package ID SqlLocalDB_CTP3_Cpu64: NotInstalled Sco: File 'C:\SQL Install\1033_ENU_LP\x64\setup\x86\SSDTStub.msi' does not exist Sco: File 'C:\SQL Install\1033_ENU_LP\x64\setup\x86\SSDTStub.msi' does not exist Package ID SSDTStub_Cpu32: NotInstalled Sco: File 'C:\SQL Install\1033_ENU_LP\x64\setup\x86\SSDTDBSvcExternals.msi' does not exist Sco: File 'C:\SQL Install\1033_ENU_LP\x64\setup\x86\SSDTDBSvcExternals.msi' does not exist What does this mean?

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  • Need a solution to store images (1 billion, 1000,000,000) which users will upload to a website via php or javascript upload [on hold]

    - by wish_you_all_peace
    I need a solution to store images (1 billion) which users will upload to a website via PHP or Javascript upload (website will have 1 billion page views a month using Linux Debian distros) assuming 20 photos per user maximum (10 thumbnails of size 90px by 90px and 10 large, script resized images of having maximum width 500px or maximum height 500px depending on shape of image, meaning square, rectangle, horizontal, vertical etc). Assume this to be a LEMP-stack (Linux Nginx MySQL PHP) social-media or social-matchmaking type application whose content will be text and images. Since everyone knows storing tons of images (website users uploaded images in this case) are bad inside a single directory or NFS etc, please explain all the details about the architecture and configuration of the entire setup of storage solution, to store 1 billion images on any method you recommend (no third-party cloud storage like S3 etc. It has to be within the private data center using our own hardware and resources.). The solution has to include both the storage solution and organizing the images uploaded by users. How will we organize the users images if a single user will not have more than 20 images (10 thumbs and 10 large of having either width or height 500px)? Please consider that this has to be organized in a structural way so we can fetch a single user's images via PHP/Javascript or API programmatically through some type of user's unique identifier(s).

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  • Thread Synchronization - UI thread and Worker thread

    This article describes how a Worker thread can take the control of the UI and can update the UI, created by the UI thread. This will be useful when a worker thread needs to update the UI in the mid of the background processing or on the completion without relying on UI thread to synchronize the work

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  • Enabling Hyper-V Integrated Services Time Sync Services versus Internet Time Synchronization

    - by cpuguru
    Should I deselect the "Synchronize with an Internet Time Server" checkbox under the VM's "Date and Time - Internet Time Settings" tab if the "Time Synchronization Service" for a Hyper-V-based Virtual Machine is enabled? One of the Integration Services that Hyper-V provides is the Time Synchronization Service, which can be enabled/disabled by going to a VM's Settings-Integration Services setting in the Management section. I believe this is checked by default. When you install a Windows Server 2008 OS in a VM on the Hyper-V server, it comes with the "Synchronize with an Internet Time Server" option set, pointing to "time.windows.com". I'd think that if the parent Hyper-V server is set to one time server, and the child VM is pointing to a different time server, there would be a momentary blip if the two are not spot on with their times when the synchronization services run. So the question is, which time sync service should I use? I'm assuming not both. And what is the advantage of one over the other? Note: This question assumes that the machines are not joined to a domain. If they were, the machines would also try to update their time against the domain controller with the primary domain controller role too, right? Thanks!

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  • Copy website content from WebsiteA.com/file.html to WebsiteB/file.com every time interval

    - by Jimbo Mombasa
    I want to copy a website from http://stats.pingdom.com/file... to http://mywebsite.com/file every 10 min. Then with purple-include I want to do a transclusion and display it on http://mywebsite.com/page.html So the task is download http://stats.pingdom.com/file to http://mywebsite.com/file I figured out the transclusion part but I do not know how to copy a wabpage from A to B. Are there any script for this or how can I do this?

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  • What You Said: How Do You Sync Your Files Between Your Devices?

    - by Jason Fitzpatrick
    Earlier this week we asked you to share your tricks and techniques for keeping files synced between your different devices. Now we’re back to highlight how you do it. Overwhelmingly, you do it with Dropbox. Despite the proliferation of different platforms there has been little inroads made into any sort of universal syncing. We heard from quite a few different readers and by far the most popular option was to use Dropbox to ensure that you could get the music and documents you wanted whether you were on your desktop, laptop, netbook, iPhone, or Android device. In the same breath however, nearly all of your added on an additional service. The real message, it would seem, is that there simply isn’t a service good enough to meet all of the needs most users have, all of the time. The most common response to our Ask the Readers question was “Dropbox and…”; this pattern is illustrated nicely in the following quotes. Kim writes: Dropbox for all kinds of things. (Would also use Sugarsync, but it doesn’t support Linux.) Lastpass for passwords. Xmarks for bookmarks, although I’m going to try Firefox Sync soon. Evernote for things like shell commands I might want someday. Google Beta for music, once I get it uploaded. I have an Amazon account too, but Google gives you more space. Gmail. Michael finds himself in a similar situation and writes: How to Make and Install an Electric Outlet in a Cabinet or DeskHow To Recover After Your Email Password Is CompromisedHow to Clean Your Filthy Keyboard in the Dishwasher (Without Ruining it)

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  • Storing lots of large strings with frequent "appends" and few reads

    - by Thiago Moraes
    In my current project, I need to store a very long ASCII string to each instance of a given object. This string will receive an 2 appends per minute and will not be retrieved so frequently. The worst case scenario is a 5-10MB string. I'll have thousands of instances of my object and I'm worried that storing all those strings in the filesystem would not be optimal, but I can't think of a better solution. Can anyone suggest an alternative? Maybe a key-value store? In this case, which one? Any other thoughts?

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  • Metaphor for task synchronization [closed]

    - by nkint
    I'm looking for a metaphor. A friend of mine taught me to use metaphors from nature, everyday life, math, and use them to design my projects. They can help in creating a better design or better understanding or the problem, and they are cool. Now I'm working on a project with hardware and micro-controllers in C. For convenience, I have decided to use multiple micro-controllers as co-processor units for real-time (the slaves) and a master. This has saved me a lot of headache: I can code the main logic in the master without paying too much attention to super optimizing everything; I don't care if I need some blocking-call; I don't worry about serial communication with the computer. I just send messages to the slaves and they are super fast super in real time. I like my design and it seems to work well. So here are the important concepts that I'm trying capture in the metaphor: hierarchy of processing Not using one big brain but rather several small, distributed brain units using distributed power or resources I'm looking for a good metaphor for this concept of having one unit synchronize the work of all the others. Preferably, the metaphor would come from nature, biology, or zoology.

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  • Healthcare Mobile Database Synchronization Demonstration

    - by Jim Connors
    Like many of you, I learn best by getting my hands dirty.  When confronted with the task of understanding a new set of products and technologies and figuring out how they might apply to a vertical industry like healthcare, I set out to create a demonstration.  The video that follows aims to show how the Oracle embedded software portfolio can be applied to a healthcare application.  The demonstration utilizes among others, Java SE Embedded, Berkeley DB, Apache Tomcat, Oracle 11gR2 and Oracle Database Mobile Server. Eric Jensen gives a great critique and description of the demo here.  To sum it up, we aim to show how live medical data can be collected on a medical device, stored in a local database, synchronized to a master database and furthermore propagated to a mobile phone (Android) application.  Come take a look!

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  • Multi-Threaded Pipelined Game Engine Data Synchronization Questions

    - by Douglas
    Let's say I'm setting up a worker pool based game engine with pipelining. Let's say I have 4 stages in my pipeline as such: Stage 1: Physics Stage 2: AI/Input Stage 3: Game Logic Stage 4: Rendering Now let's say that the physics detects a collision between a bullet and a character in stage 1. Two frames later the game logic may choose to remove that bullet from the simulation, however none of the other copies of the data for the other pipeline stages will get this information. How is this sort of thing and other things like it get handled? Do you generally make changes like this to every pipeline stage's data at the end of a frame?

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  • Data Synchronization in mobile apps - multiple devices, multiple users

    - by ProgrammerNewbie
    I'm looking into building my first mobile app. One of the core features of the application is that multiple devices/users will have access to the same data -- and all of them will have CRUD rights. I believe the architecture should involve a central server where all the data is stored. The devices will use an API to interact with the server to perform its data operations (e.g. adding a record, editing a record, deleting a record). I imagine a scenario where synchronizing the data will become a problem. Assume the application should work when it is not connected to the Internet, and thus cannot communicate with this central server. So: User A is offline and edits record #100 User B is offline and edits record #100 User C is offline and deletes record #100 User C goes online (presumably, record #100 should get deleted on the server) User A and B goes online, but the records they edited no longer exist All sorts of scenarios similar to the above can come up. How is this generally handled? I plan to use MySQL, but am wondering if it's not appropriate for such a problem.

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  • Free file/image hosting website with api [closed]

    - by KoolKabin
    Possible Duplicate: Which image sharing websites supports file uploading dynamically via api I would like to know is there any free images/file hosting website which will allow users to upload image to its website using api? I tried with imageshack.us its fine only problem with it is that i could not make upload the files under my account in imageshack . URL: http://www.outsourcingnepal.com/ImageShack/Uploader/

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  • Delete temp file during finally vs delete output file during catch

    - by Russell
    This is in Java 6. I've seen more than once that people create temp files, do something, then rename it to the output file. Everything is wrapped in a try-finally block, where the temp file is deleted in finally in case something goes wrong in between. try { //do something with tempFile //do something with tempFile //do something with tempFile tempFile.renameTo(outputFile); } finally { if (tempFile.exists()) tempFile.delete() } I was wondering what are the benefits of doing that instead of doing something to the output file directly and delete it in case of exceptions. try { //do something with outputFile //do something with outputFile //do something with outputFile } catch (Exception e) { if (outputFile.exists()) outputFile.delete(); } My guess is that deleting temp files in finally benefits me when the try block can throw many kinds of exceptions. Is my guess right? What else?

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  • [c++] How to create a std::ofstream to a temp file?

    - by dehmann
    Okay, mkstemp is the preferred way to create a temp file in POSIX. But it opens the file and returns an int, which is a file descriptor. From that I can only create a FILE*, but not an std::ofstream, which I would prefer in C++. (Apparently, on AIX and some other systems, you can create an std::ofstream from a file descriptor, but my compiler complains when I try that.) I know I could get a temp file name with tmpnam and then open my own ofstream with it, but that's apparently unsafe due to race conditions, and results in a compiler warning (g++ v3.4. on Linux): warning: the use of `tmpnam' is dangerous, better use `mkstemp' So, is there any portable way to create an std::ofstream to a temp file?

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  • File won't save output to file, and prints out a string oddly C++ Linux

    - by Predictability
    I'm trying to make a password code, the user enters a password, then it will save the password to a file in /tmp/ and then it will output the password (For me so I can find bugs). I have included the "string" library, and I set the password type to string, but when I output it, it outputs like this: 0x7fffb55baac0password // <-- thats the password I entered It will output hex (I think), then the password I entered, and it won't save it to the file in /tmp/ I want it to (Or any file in /tmp/). Here's the source code: http://codepad.org/3aamAv7R Thank you for all the help you guys have given me so far.

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  • perl + shell script + remove all not uniq lines except the first line uniq (FILE NAME) + perl in she

    - by yael
    hi I have the following file How to remove by sed all FILE NAME lines except the first uniq FILE NAME For example need to remove all FILE NAME lines from the file except the first: FILE NAME: /dir1/dir2/dir3/dir4/dir5/file FILE NAME: /dirA/dirB/dirC/dirD/dirE/file the file: FILE NAME: /dir1/dir2/dir3/dir4/dir5/file PARAMETER NAME: blablabla TARGET FILE: 12 SOURCE FILE: 565 FILE NAME: /dir1/dir2/dir3/dir4/dir5/file PARAMETER NAME: blablabla TARGET FILE: 18 SOURCE FILE: 552 FILE NAME: /dir1/dir2/dir3/dir4/dir5/file PARAMETER NAME: blablabla TARGET FILE: 14 SOURCE FILE: 559 FILE NAME: /dirA/dirB/dirC/dirD/dirE/file PARAMETER NAME: blablabla TARGET FILE: 134 SOURCE FILE: 344 FILE NAME: /dirA/dirB/dirC/dirD/dirE/file PARAMETER NAME: blablabla TARGET FILE: 13 SOURCE FILE: 445 FILE NAME: /dirA/dirB/dirC/dirD/dirE/file PARAMETER NAME: blablabla TARGET FILE: 13

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