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  • Architecture of a secure application that encrypts data in the database.

    - by Przemyslaw Rózycki
    I need to design an application that protects some data in a database against root attack. It means, that even if the aggressor takes control over the machine where data is stored or machine with the application server, he can't read some business critical data from the database. This is a customer's requirement. I'm going to encrypt data with some assymetric algorithm and I need some good ideas, where to store private keys, so that data is secure as well as the application usability was quite comfortable? We can assume, for simplicity, that only one key pair is used.

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  • What is a good architecture for a Lift-JPA application?

    - by egervari
    I was wondering what is the best practice for a JPA model in Lift? I noticed that in the jpa demo application, there is just a Model object that is like a super object that does everything. I don't think this can be the most scalable approach, no? Is it is wise to still do the DAO pattern in Lift? For example, there's some code that looks a tad bloated and could be simplified across all model objects: Model.remove(Model.getReference(classOf[Author], someId)) Could be: AuthorDao.remove(someId) I'd appreciate any tips for setting up something that will work with the way Lift wants to work and is also easy to organize and maintain. Preferably from someone who has actually used JPA on a medium to large Lift site rather than just postulating what Spring does (we know how to do that) ;) The first phase of development will be around 30-40 tables, and will eventually get to over 100... we need a scalable, neat approach.

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  • DB Architecture : Linking to intersection or to main tables?

    - by Jean-Nicolas
    Hi, I'm creating fantasy football system on my website but i'm very confuse about how I should link some of my table. Tables The main table is Pool which have all the info about the ruling of the fantasy draft. A standard table User, which contains the usual stuff. Intersection table called pools_users which contains id,pool_id,user_id because a user could be in more than one pool, and a pool contains more than 1 user. The problem Table Selections = that's the table that is causing problem. That's the selection that the user choose for his pool. This is related to the Player table but thats not relevant for this problem. Should I link this table to the table Pools_users or should I link it with both main table Pool and User. This table contains id,pool_id,user_id,player_id,... What is the best way link my tables? When I want to retrieve my data, I normally want the information to be divided BY users. "This user have those selections, this one those selections, etc).

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  • What do you call a generalized (non-GUI-related) "Model-View-Controller" architecture?

    - by dcuccia
    I am currently refactoring code that coordinates multiple hardware components for data acquisition, and feeling a bit like I'm recreating the wheel. In particular, an MVC-like pattern seems to be emerging. Except, this has nothing to do with a GUI and I'm worried that I'm forcing this particular pattern where another might be more appropriate. Here's my scenario: Individual hardware "component" classes obey interface contracts for each hardware type. Previously, component instances were orchestrated by a single monolithic InstrumentController class, which relied heavily on configuration + branching logic for executing a specific acquisition sequence. After an iteration, I have a separate controller for each component, with these controllers all managed by a small InstrumentControllerBase (or its derivatives). The composite system will receive "input" either programmatically or via inter-hardware component triggering - in either case these interactions are routed to, and handled by, the appropriate controller. So, I have something that feels MVC-esque, but I don't know if that's because I'm forcing the point. With little direct MVC experience in application development, it's hard to know if I'm just trying to make my scenario fit MVC, where another pattern might be a good alternative or complimentary. My problem is, search results and wiki documentation of these family of patterns seems to immediately drop me into GUI-specific discussions. I understand "M means Model data and the V means View" - but do you call the superset pattern? Component-Commander-Controller? Whence can I exhume examples exemplary?

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  • Booking logic and architecture, database sync: Hotels, tennis courts reservation system ...

    - by coulix
    Hello Stackers, Imagine that you want to design a tennis booking system. You have 5 tennis clubs as partenrs with no online api allowing you to check on their side if a court is booked or not: You have to build this part as well. Every time a booking is done on their side you want it to be know by our system. Probably using a POST request form tennis partner to our server. Every time a booking is done on our website, we want to push the booking to their system. The difficulty is that their system need to be online and accessible from outside. Ip may change, we have to use a dns updater. In case their system is not available we still accept the booking and fallback to an async email with 'i confirm booking/reject booking' link sent to the club. I find the whole process quite complex and was wondering about the way online hotel booking system and hotel were working. Do they all have their data open and online ? The good thing is that the data will grow large and fits nicely to some no SQL ;) like couch db

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  • Content disappearing

    - by Koen_vdp
    several times now, I've had a document with very large parts of the content simply disappearing. I have Ubuntu (precise pangolin) a few days now. all of the years with windows, I never encountered this-very unpleasant-problem. Anyone knows a solution? Type document: docx; Which Ubuntu: Precise Pangolin LTS. &In the meantime, I'm discovering more & more documents like that with very large parts of the concent just... vanished :-(( A very 'dangereous' situation :-(

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  • What's wrong with the architecture of a game object drawing and updating itself?

    - by Ricket
    What are the reasons for and against a game object drawing and updating itself? For example, if you have a game where the player has a position on screen, why not have an all-encompassing class: public class Player { private int x, y, xVelocity, yVelocity; private Sprite s; //... public Player() { // load the sprite here, somehow? } public void draw(CustomGraphicsClass g) { g.draw(s, x, y); } public void update(long timeElapsed) { x += (xVelocity * timeElapsed); y += (yVelocity * timeElapsed); } } What is wrong with this design? What are the downfalls or concerns? How would you better write something like this, or better architect this type of thing in a game? Also, somewhat connected, how would you implement loading that Sprite image? And furthermore, how would you then implement collision between two Players? (I should probably separate these extra two questions into new questions, huh?)

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  • Cannot reach reach jQuery (in parent document ) from IFRAME

    - by Michael Joyner
    I have written a backup program for SugarCRM. My program sets a iframe to src=BACKUP.PHP My backup program sends updates to parent window with: echo "<script type='text/javascript'>parent.document.getElementById('file_size').value='".fileSize2human(filesize($_SESSION['archive_file_name']))."';parent.document.getElementById('file_count').value=".$_SESSION['archive_file_count'].";parent.document.getElementById('description').innerHTML += '".$log_entry."\\r\\n';parent.document.getElementById('description').scrollTop = parent.document.getElementById('description').scrollHeight;</script>"; echo str_repeat( ' ', 4096); flush(); ob_flush(); I have added a JQUERY UI PROGRESS BAR and I need to know how I update the progress bar on the parent window. I tried this: $percent_complete = $_SESSION['archive_file_count'] / $_SESSION['archive_total_files']; echo "<script type='text/javascript'>parent.document.jquery('#progressbar').animate_progressbar($percent_complete); </script>"; ......... and get this error in browser. Uncaught TypeError: Object [object HTMLDocument] has no method 'jquery' HOW CAN I UPDATE THE PROGRESS BAR IN PARENT DOCUMENT FROM THE IFRAME?

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  • Microsoft Office document is "locked for editing by 'another user'"

    - by Chris
    A few of my users are in and out of various Excel 2007 spreadsheets all day. One of them reports that "50% of the time" she tries to open a spreadsheet from the file server, an information message comes up stating: foo.xlsx is locked for editing by 'another user'. Open "Read-Only" or click "Notify" to open read-only and receive notification when the document is no longer in use. Nine times out of ten the document is not open by another user. My users immediately try to open the same document again, and it works. I imagine this is caused by Excel leaving owner files on the server, but I do not know why. An added clue: When one of my users selects "Notify," a dialog pops up in a moment informing them the file is available for them to edit. Any guidance on how to solve this issue and make my users' days flow better?

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  • How to normalize a word document?

    - by AngryHacker
    I was too cheap to hire someone to retype a really, really long scanned document full of legalese. So I OCRed it using OmniPage. But the OCR output was kind of disappointing. I got a word doc that has multiple line spacings. The before and after paragraph heights are different all over the place. This would be easy, if the entire document had the same paragraph settings, but it does not. There are probably a half dozen different styles going on. What is the easiest way to normalize the document? For instance, if one paragraph has a line spacing of 20.4 pt and another one has a spacing of 20.9 pt, then I'd like to consider them the same style and set them to a single value? Or really, any suggestion is welcome at this point.

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  • A Firefox extension for scan & upload document?

    - by Ivan Petrushev
    Hello, Do you know such an extension that provides easy document scanning in Firefox? We are building a web site and we want visitors to be able to upload scanned documents to it. The normal procedure for that is: Scan the document via Gimp, Photoshop or some other scanning software. Save the file. Navigate to the upload web page. Find some sort of HTML input type file on that page. Browse and find the saved file. Submit the form. I want an extension or plugin that automatize that process and do everything with 1 click - scan the document with some default settings (for example "grayscale, 300 dpi") creates temporary file, fills the page input field and deletes the temporary file after upload. I tried lots of googling but the term scan in combination with everything web-related gives zillions of virus, malware and port scanners...

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  • Ideas for scaling out database architecture

    - by andrew
    We're looking to scale out our existing database architecture and need some advice on which way to go. We currently have 2 web servers behind a load balancer that both read & write to a single master database which replicates to a slave. Ideally, I'd like each of the webservers to point to their own master DB and have the data between the 2 synchronised but from what I've read, using any kind of master-master or ring-replication is discouraged. I'm looking for a general "what do other people do" kind of answer - database vendor isn't a concern at the moment but we'd like to stay with MySQL or convert to MSSQL. Any ideas would be gratefully received. Many thanks, Andrew

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  • Network architecture when using Rackspace's Cloud

    - by brianz
    I'm planning on launching a web application soon, and have decided on using Rackspace's Cloud offering with Debian. I'm not expecting that much traffic to start, but would rather get the architecture correct now even with the small VPSs. The thing I'm not quite sure about is how many VPSs I should get. At a minimum, I know I'll want three VPSs: Two Apache webservers One server for MySQL I'd also like: Nginx load balancer MySQL replication memcached I'm not sure where those last three processes should be running. Can the load balancer run on the same machine as the MySQL slave, or should they each run on their own machine? Does memcached run alongside the webservers or on different machines?

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  • Compiling LaTeX document makes Google Drive crash

    - by Sander
    I've the issue that when I compile a LaTeX document that is located inside my Google Drive this will after a few turns make the OSX Google Drive application crash. As this is an important document I want to keep it all the time inside the Google Drive location to ensure cloud backup but this ofcourse is not guaranteed if this makes my Google Drive crash all the time. I don't seem te be able to identify what is causing this and I was hoping that maybe some people here have any idea what might cause this? We're talking about a 8 pages document with 3 images, so nothing crazy big or complex.

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  • Word document to PDF: open hyperlinks in new window

    - by baens
    I have a Mircosoft Word document with hyperlinks in it. When I save the PDF document, those hyperlinks no longer open that link in a new window. I have tried all the settings under the "Target Frame..." option, but those don't seem to persist. Is there any settings that help with this to make all hyperlinks in the document open in a new window? I am currently using the Acrobat plugin, but could move to a different plugin if it offers this feature.

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  • Selection Issues with a PDF from a Word document

    - by syrion
    I have a long Word document that has a running footer. When I try to copy and paste across pages in the PDF generated from this document, the behavior of this footer is unpredictable--sometimes it is unselected, sometimes it is selected, sometimes the footer on the next page is selected. I would prefer to make this portion of the document unselectable, so that it still shows up but doesn't interfere with copying and pasting. Does anyone have an idea of how to do this? No, changing it to an image isn't possible, because it includes a page number.

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  • strategy /insights for avoiding document content loss due to encryption

    - by pbernatchez
    I'm about to encourage a group of people to begin using S-Mime and GPG for digital signatures and encryption. I foresee a nightmare of encrypted documents which can no longer be recovered because of lost keys. The thorniest issue is archiving. The natural way to preserve privacy in an archive is to archive the encrypted document. But that opens us up to the risk of a lost key when time comes to unarchive a document, or a forgotten password. After all it will be a long way in the future. This would be equivalent to having destroyed the document. First thought is archiving keys with documents, but that still leaves the forgotten pass phrase. Archiving the passphrase too would be tantamount to archiving in the clear. No privacy. What approaches do you use? What insights can you offer on the issue?

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  • Can't print graphic from Publisher to pre-printed document

    - by Michael Itzoe
    I have a client who was given a stack of 8.5x11 tri-fold (unfolded) brochures printed on standard printer paper that they need to add their bulk mail permit stamp to. They've created a Publisher document with the stamp. If they print the document to standard paper in the tray, it prints fine. When they load the brochures into the tray, the brochure feeds through the printer but the stamp doesn't print. The stamp document is also 8.5x11. The printer is a Canon MF4300-D44. I can remoted in, but obviously have no access to the hardware. Any ideas?

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  • Excel Document Size is at 0KB, can't be opened

    - by Bassam
    After I saved an Excel document, I remembered that I needed to change something in it, so I go back to open it and it said Excel cannot open the file, because the file format or the file extension is not valid. Verify that the file has not been corrupted and that the file extension matches the format of the file. I know when I saved before, around 2hours ago, it worked just fine. The document size is at 0KB now. How do I recover this document? Its crucial for my business!

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  • options for physical architecture of rails site regarding caching server or cdn

    - by timpone
    I have a rails app that is set on a single server currently. On production, I force_ssl for everything. I am interested in using a caching server for images (I'm fine with css and js being served from origin for time being). Would nginx or varnish (which I have no experience with) be a better solution (for October 2012)? I'd imagine that it would be easy to switch these around while still on this single server architecture. Or would something like cloudfront (which I also have no experience with) make sense for hosting image files? I know this is a vague question but appreciate any current feedback. thx in advance

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  • Word 2010, how to update protected document

    - by Seth
    The document has one "Section Break" with e.g. "Text Form Fields" above. To make this Form Field work properly I use "Restrict Editing", allow "Filling in Forms", "Select Sections" and then protect Section 1. Then "Start Enforcing Protection". Now when the document is protected above the Section Break you can't use CTRL-Aand F9 to make an update of the fields, etc. of the document below the Section Break. Is there any solution for this problem?

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  • Deployment Options for AutoVue 20.0 Users

    - by celine.beck
    AutoVue release 20.0 boasts a brand new architecture. As part of this product rearchitecture, AutoVue can now be deployed either as a desktop deployment to serve the needs of individual users in their personal productivity; or in a Client / Server deployment for those that require connections to enterprise applications / back-end systems. The most common question that we hear from our customers about this new architecture is the following: "Is AutoVue Desktop Version still part of release 20.0 and if so, what is the difference between AutoVue Desktop Version and the Desktop deployment of AutoVue release 20.0?" A detailed answer to these questions is provided in a very complete article entitled Understanding Deployment Options for AutoVue 19.3 Desktop Version users upgrading to AutoVue 20.0 (note 1058254.1) which was posted on My Oracle Support. Is AutoVue Desktop Version still part of AutoVue 20.0? Yes, AutoVue Desktop Version 20.0 is still available to customers and partners, as a maintenance release of AutoVue 19.3. As such, it will not contain any of the new capabilities featured in AutoVue release 20.0. All format enhancements and new format support have been added to release 20.0 Desktop Version though. What is the different between AutoVue Desktop Version 20.0 and the Desktop Deployment of AutoVue release 20.0? AutoVue 20.0 Desktop deployment works like the AutoVue Desktop version. It is installed as a standalone product on each user's machine and runs a local instance of AutoVue. The AutoVue 20.0 Desktop deployment includes all new features, formats and performance enhancements included in release 20.0 (walkthrough capability, improved compare, ...) What deployment options are available to AutoVue 19.3 Desktop Version customers? AutoVue Desktop Version users can evolve at their own pace to the new AutoVue platform. With release 20.0, customers can opt to: Option 1: Stay on AutoVue Desktop Version 20.0 Option 2: Migrate to AutoVue and select the desktop deployment method Option 3: Migrate to AutoVue and select the Client/Server deployment method What is the Client / Server deployment of AutoVue 20.0? The Client/Server deployment has AutoVue installed on a server, to which local client machines connect to access and view documents. AutoVue 20.0 Client Server Deployment allows users to leverage the new online/offline capabilities in release 20.0 and easily switch between online and offline modes of operation. With the Client/Server deployment, customers also get a complete, open and standards-based set of integration tools that allows them to tie AutoVue to any enterprise applications to provide users with a consistent view of data and business objects and expand workflow automation to document-based processes. Related articles: AutoVue Release 20.0 Now Available, New Walkthrough Capability in AutoVue 20.0, Watch the AutoVue 20.0 Release Webcast, April 27 at 12pm EST

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  • Vermeidung von SOA Anti-Patterns mittels AIA

    - by Hans Viehmann
    Gerade ist mir ein White Paper des Enterprise Architecture Teams in die Hände gefallen, das sich mit SOA Anti-Patterns befasst. Es ist zwar kein AIA Paper im eigentlichen Sinne, aber mit AIA hat man natürlich eine gute Unterstützung darin, die dort beschriebenen Fehler zu vermeiden. Das White Paper behandelt Themen wie: Vermeidung von SOA Silos SOA Reifegrad und Projekt-Management Ausuferndes Service Portfolio Umgang mit Referenz-Architekturen EAI 2.0 - Punkt-zu-Punkt Integration auf offenen Standards Ein Link auf das Dokument ist unten angefügt - viel Vergnügen bei der Lektüre ... Oracle White Paper: SOA Anti-Patterns.

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  • ROA on top of SOA

    - by Vaibhav Pujari
    I already have a stable Service Oriented Architecture for my application which exposes services as API calls. (the verbs) Now, I need to build a Resource Oriented Architecture to expose a RESTful API to interact with the application objects. (the nouns) What are the best practices to reuse the existing services: - without any persistence inside my new code. - without putting unnecessary logic into the REST layer i.e. it should ideally just leverage the services provided by SOA API. I want this layer to be as thin as possible. - without modifying the existing SOA API - allow easy extension of the REST API i.e. it should be easy to add more resources without changing the (yet to be written) core code. (I want to make resource names and their associated actions configurable so more contributors can easily add resources without a need to understand my module) Any advices/suggestions how to achieve this? Edit: Adding more info My Stack: My existing stacks is in Java. But since I plan to just use the services, I don't think that should affect the design of new REST code. I am planning to implement the new REST code in PHP. How well the services map to resources? Some services are mapped well i.e. there are services for creating, updating application objects. But for other application objects, there are no direct services available. More importantly, there are actions beyond just create, update etc. that apply to application objects. And I would like to provide some way for these actions to be exposed through REST. Since these are verbs, how do I deal with them? Where exactly I need help? I would appreciate any help towards high level design to accomplish the task along-with making the framework extendible. For instance, tomorrow there are some new services added to my SOA layer, I want to make sure it is easy for a fresh developer to write a REST call by simply registering a new resource (in a config file/db) and write code for connecting it with SOA calls. Just like plugin.

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