Search Results

Search found 17727 results on 710 pages for 'large apps'.

facebook twitter digg google delicious technorati stumbleupon myspace wordpress linkedin gmail igoogle windows live tumblr viadeo yahoo buzz yahoo mail yahoo bookmarks favorites email print

Page 23/710 | < Previous Page | 19 20 21 22 23 24 25 26 27 28 29 30  | Next Page >

  • MySQL Binary Storage using BLOB VS OS File System: large files, large quantities, large problems.

    - by Quantico773
    Hi Guys, Versions I am running (basically latest of everything): PHP: 5.3.1 MySQL: 5.1.41 Apache: 2.2.14 OS: CentOS (latest) Here is the situation. I have thousands of very important documents, ranging from customer contracts to voice signatures (recordings of customer authorisation for contracts), with file types including, but not limited to jpg, gif, png, tiff, doc, docx, xls, wav, mp3, pdf, etc. All of these documents are currently stored on several servers including Windows 32 bit, CentOS and Mac, among others. Some files are also stored on employees desktop computers and laptops, and some are still hard copies stored in hundreds of boxes and filing cabinets. Now because customers or lawyers could demand evidence of contracts at any time, my company has to be able to search and locate the correct document(s) effectively, for this reason ALL of these files have to be digitised (if not already) and correlated into some sort of order for searching and accessing. As the programmer, I have created a full Customer Relations Management tool that the whole company uses. This includes Customer Profiles management, Order and job Tracking tools, Job/sale creation and management modules, etc, and at the moment any file that is needed at a customer profile level (drivers licence, credit authority, etc) or at a job/sale level (contracts, voice signatures, etc) can be uploaded to the server and sits in a parent/child hierarchy structure, just like Windows Explorer or any other typical file managment model. The structure appears as such: drivers_license |- DL_123.jpg voice_signatures |- VS_123.wav |- VS_4567.wav contracts So the files are uplaoded using PHP and Apache, and are stored in the file system of the OS. At the time of uploading, certain information about the file(s) is stored in a MySQL database. Some of the information stored is: TABLE: FileUploads FileID CustomerID (the customer id that the file belongs to, they all have this.) JobID/SaleID (the id of the job/sale associated, if any.) FileSize FileType UploadedDateTime UploadedBy FilePath (the directory path the file is stored in.) FileName (current file name of uploaded file, combination of CustomerID and JobID/SaleID if applicable.) FileDescription OriginalFileName (original name of the source file when uploaded, including extension.) So as you can see, the file is linked to the database by the File Name. When I want to provide a customers' files for download to a user all I have to do is "SELECT * FROM FileUploads WHERE CustomerID = 123 OR JobID = 2345;" and this will output all the file details I require, and with the FilePath and FileName I can provide the link for download. http... server / FilePath / FileName There are a number of problems with this method: Storing files in this "database unconcious" environment means data integrity is not kept. If a record is deleted, the file may not be deleted also, or vice versa. Files are strewn all over the place, different servers, computers, etc. The file name is the ONLY thing matching the binary to the database and customer profile and customer records. etc, etc. There are so many reasons, some of which are described here: http://www.dreamwerx.net/site/article01 . Also there is an interesting article here too: sietch.net/ViewNewsItem.aspx?NewsItemID=124 . SO, after much research I have pretty much decided I am going to store ALL of these files in the database, as a BLOB or LONGBLOB, but there are still many considerations before I do this. I know that storing them in the database is a viable option, however there are a number of methods of storing them. I also know storing them is one thing; correlating and accessing them in a manageable way is another thing entirely. The article provided at this link: dreamwerx.net/site/article01 describes a way of splitting the uploaded binary files into 64kb chunks and storing each chunk with the FileID, and then streaming the actual binary file to the client using headers. This is a really cool idea since it alleviates preassure on the servers memory; instead of loading an entire 100mb file into the RAM and then sending it to the client, it is doing it 64kb at a time. I have tried this (and updated his scripts) and this is totally successful, in a very small frame of testing. So if you are in agreeance that this method is a viable, stable and robust long-term option to store moderately large files (1kb to couple hundred megs), and large quantities of these files, let me know what other considerations or ideas you have. Also, I am considering getting a current "File Management" PHP script that gives an interface for managing files stored in the File System and converting it to manage files stored in the database. If there is already any software out there that does this, please let me know. I guess there are many questions I could ask, and all the information is up there ^^ so please, discuss all aspects of this and we can pass ideas back and forth and teach each other. Cheers, Quantico773

    Read the article

  • What is the email limit on Google Apps Script?

    - by jmvidal
    Can someone tell me if there is a webpage that lists the official Google limit on emails sent from a Google Apps Script? In testing my little script I got a Service invoked too many times: email (# 59) and now I can't send any more emails. The obvious place for this information would be in the MailApp.sendEmail documentation. But, that does not say anything about a limit. I found this discussion on the google forum from 2/11/10 where users discuss about a 100 or 500 emails/day limit, with a 24 hour ban, but no one from Google provided an official answer. Note that this is for google apps script, which is different from the google app engine, which does have well published limits.

    Read the article

  • Is there a distributed VCS that can manage large files?

    - by joelhardi
    Is there a distributed version control system (git, bazaar, mercurial, darcs etc.) that can handle files larger than available RAM? I need to be able to commit large binary files (i.e. datasets, source video/images, archives), but I don't need to be able to diff them, just be able to commit and then update when the file changes. I last looked at this about a year ago, and none of the obvious candidates allowed this, since they're all designed to diff in memory for speed. That left me with a VCS for managing code and something else ("asset management" software or just rsync and scripts) for large files, which is pretty ugly when the directory structures of the two overlap.

    Read the article

  • One click login to my google apps solution how can I do it?

    - by Ali
    Hi guys I'm developing a google apps solution and I'm building on the tutorial application give by google at http://code.google.com/googleapps/marketplace/tutorial_php.html - the thing is that the example given sets up the application such that the user has to enter in manually the email address or username and then it takes the user through an authentication process whereby it asks the user if they wish to allow the application to be given access to the services mentioned in the manifest.xml file. Isn't there a better way to do this I mean like I want that when the user upon logging into his google apps account just has to click in the application link installed and straight on should be able to enter the application. Can't the process of authentication and all be transparent in the backdrop. I need help on this asap. Thanks a bunch!

    Read the article

  • How to send mail with large size attachment using System.Net.Mail to Google Apps ?

    - by Preeti
    Hi, I am trying to send mail with large size attachment upto (1MB,2MB). But sending mail fails.(Sending to Google Apps) as: MailItemEntry[] entries = new MailItemEntry[1]; String EmlPath = "C:\\testemail.eml"; String msg = File.ReadAllText(EmlPath); entries[0] = new MailItemEntry(); entries[0].Rfc822Msg = new Rfc822MsgElement(msg); How can i divide attachments into multi part? Exception I am getting while migrating this EML to Google apps is: {"The request was aborted: The request was canceled."}

    Read the article

  • How to insert large files in mysql database using php? [closed]

    - by anjan
    Hi! I want to upload a large file of size 10M max to my mysql database. Using .htaccess i changed the PHP's own file upload limit to "10485760" = 10M, i am able to upload files upto 10M size without any problem. But i can not insert the file in database if it is more that 1M in size. i am using file_get_contents to read all file data and pass it to the insert query as a string to be inserted into a LONGBLOB field. But files with more than 1M size is not being added to database, though i can use print_r($_FILES) to examine that the file uploaded correctly. Any help will be appreciated and i will need it within next 6 hours. So, please help! best regards, Anjan * This is a duplicate of http://stackoverflow.com/questions/492549/how-can-i-insert-large-files-in-mysql-db-using-php *

    Read the article

  • Iterating over a large data set in long running Python process - memory issues?

    - by user1094786
    I am working on a long running Python program (a part of it is a Flask API, and the other realtime data fetcher). Both my long running processes iterate, quite often (the API one might even do so hundreds of times a second) over large data sets (second by second observations of certain economic series, for example 1-5MB worth of data or even more). They also interpolate, compare and do calculations between series etc. What techniques, for the sake of keeping my processes alive, can I practice when iterating / passing as parameters / processing these large data sets? For instance, should I use the gc module and collect manually? Any advice would be appreciated. Thanks!

    Read the article

  • Fill a Flash Drive with Portable Software using Lupo PenSuite

    - by Asian Angel
    A flash drive full of portable software is helpful to have along wherever you go. The Lupo PenSuite lets you choose from three different versions to get the best fit for your everyday needs. Note: If running the full version you will need a 512 MB USB flash drive or larger. Using Lupo PenSuite The one window to watch for during the setup process is where you have the opportunity to add a specific language pack if needed. Outside of that all that you need to do is sit back and wait for the suite to be extracted. Note: Extraction times will vary based on version and extraction location. Here we browsed to our flash drive to extract it to… Once the setup process is complete locate and double click the Lupo_PenSuite.exe file. This one time window will present you the opportunity to start using the suite immediately, or go directly into the options. When the suite is active you will have a new system tray icon that operates as a start menu button. At the bottom you can monitor the remaining room on your flash drive, and use the close button to exit the suite (may display as a power button based on menu theme). A quick look at the set up inside the suite. There is a pre-configured area for organizing and storing your personal files. Prefer a classic style menu? Just select for it in the options (various tab) and enjoy a smaller streamlined look. Note: You can also change the theme for the regular menu and add a user pic. The suite provides access to your portable software and online sites. You get to enjoy the best of both as shown in the following examples. Websites will open using the suite’s portable Firefox install. VLC is ready to play your downloaded videos. The suite also has some very nice photo editing programs added in. Installing Additional Apps If one of your favorite programs is not included in the suite version, it only takes a few minutes to add it in. Go to the Additional Apps webpage, download the app(s), and extract them onto your hard-drive. Note: Link for additional apps webpage provided below. Add the extracted app(s) to the MyApps folder in the suite’s folder hierarchy. Click on ASuite in the suite’s start menu. Drag and drop the portable app’s exe file into the MyApps section in the ASuite window. Your new software’s shortcut should display as shown here. Close this window when finished. Checking the suite’s start menu will show your new software ready to be used. Conclusion If you need a good portable software collection to carry with you on a flash drive then Lupo PenSuite is definitely worth taking a look at. We tested Lupo PenSuite on XP, Vista, and Windows 7 and it works great on all three. Another popular choice is PortableApps and you can check out our Review of that too they are essentially the same thing, each is just packaged differently. Links Download Lupo PenSuite (Full, Lite, & Zero versions) *Download links approximately one-third down the page. Download Additional Apps for Lupo PenSuite Download Additional Skins for Lupo PenSuite Start Menu View Video Tutorials *Has tutorial for easy updating of entire suite. Similar Articles Productive Geek Tips Install and Run Applications from Your iPod, Flash Drive or Mp3 PlayerRebit Backup Software [Review]BitLocker To Go Encrypts Portable Flash Drives in Windows 7Create a Bootable Ubuntu USB Flash Drive the Easy WaySpeed up Your Windows Vista Computer with ReadyBoost TouchFreeze Alternative in AutoHotkey The Icy Undertow Desktop Windows Home Server – Backup to LAN The Clear & Clean Desktop Use This Bookmarklet to Easily Get Albums Use AutoHotkey to Assign a Hotkey to a Specific Window Latest Software Reviews Tinyhacker Random Tips All My Movies 5.9 CloudBerry Online Backup 1.5 for Windows Home Server Snagit 10 VMware Workstation 7 Google TV The iPod Revolution Ultimate Boot CD can help when disaster strikes Windows Firewall with Advanced Security – How To Guides Sculptris 1.0, 3D Drawing app AceStock, a Tiny Desktop Quote Monitor

    Read the article

  • Apps UX Unveils New Face of Fusion at OpenWorld 2012

    - by Kathy.Miedema
    By Kathy Miedema, Oracle Applications User Experience The Oracle Applications User Experience (UX) team is getting ready to unveil the new face of Oracle Fusion Applications at Oracle OpenWorld 2012 in San Francisco next week. Photos by Martin Taylor, Oracle Applications User ExperienceJeremy Ashley, Vice President of Oracle Applications User Experience, shows the new face of Fusion Applications to a group of trainers at Oracle’s headquarters in Redwood Shores, Calif. Our team spent the past 6 months working on this project, which embraces simplicity with a modern, productive user experience that aims to help our applications customers rapidly scale deployment of essential self-service tasks and speed adoption by users who need quick access to do quick-entry tasks. We have spent the week before OpenWorld at Oracle headquarters in Redwood Shores, conducting training sessions with Fusion UX Advocates (FXA), Oracle UX Sales Ambassadors (SAMBA), and members of the Oracle Usability Advisory Board (OUAB). We showed the new face of Fusion to customers, partners, ACE Directors, and people from our own sales organization. Next week during OpenWorld, they will be showing demos alongside our team members. To find them, look for the Usable Apps t-shirt, with this artwork: You can also get a look at the new face of Fusion during OpenWorld at the following sessions and demopods: GEN9433 - General Session: Oracle Fusion Applications—Overview, Strategy, and Roadmap Presenter: Chris Leone, Senior Vice President, Oracle Monday, Oct. 1, 10:45 a.m. – 11:45 a.m. in Moscone West 2002/2004 AND Wednesday, Oct. 3, 10:1 a.m. – 11:15 a.m. in Moscone West 2002/2004 CON9407 - Oracle Fusion Customer Relationship Management: Overview/Strategy/Customer Experiences/Roadmap Presenter: Anthony Lye, Senior Vice President, Oracle Monday, Oct. 1, 3:15 – 4:15 p.m. in Moscone West 2008 CON9438 - Oracle Fusion Applications: Transforming Insight into Action Presenters: Jeremy Ashley, Vice President Applications User Experience, Oracle; Katie Candland, Director Applications User Experience, Oracle; Basheer Khan, founder and CEO of Innowave Technology, an Oracle ACE Director for both Fusion Middleware and Applications, and a Fusion UX Advocate Tuesday, Oct. 2, 10:15 a.m. - 11:15 a.m. in Moscone West 2007 CON9467 - Oracle’s Roadmap to a Simple, Modern User Experience Presenter: Jeremy Ashley, Vice President Applications User Experience, Oracle Wednesday, Oct. 3, 3:30 p.m. - 4:30 p.m. in Moscone West 3002/3004 On the demogrounds: Come to the Apps UX pods for a look at enterprise applications on mobile devices such as smart phones and the iPad, and stay for a demo of the new face of Oracle Fusion Applications. Our demopods will also feature some of the cutting-edge tools in Oracle’s arsenal of usability evaluation methods. The Exhibition Hall at Oracle OpenWorld 2012 will be open Monday through Wednesday, Oct. 1-3. The demogrounds for Oracle Applications are located on the lower level of Moscone West in San Francisco. Hours for the Exhibition Hall are: · Monday, 10 a.m. to 6 p.m. · Tuesday, 9:45 a.m. to 6 p.m. · Wednesday, 9:45 a.m. to 4 p.m.

    Read the article

  • Review&ndash;Build Android and iOS apps in Visual Studio with Nomad

    - by Bill Osuch
    Nomad is a Visual Studio extension that allows you build apps for both Android and iOS platforms in Visual Studio using HTML5. There is no need to switch between .Net, Java and Objective-C to target different platforms - write your code once in HTML5 and build for all common mobile platforms and tablets. You have access to the native hardware functions (such as camera and GPS) through the PhoneGap library, UI libraries such as jQuery mobile allow you to create an impressive UI with minimal work. Nomad is still in an early access beta stage, so the documentation is a bit sparse. In fact, the only documentation is a simple series of steps on how to install the plug-in, set up a project, build and deploy it. You're going to want to be a least a little familiar with the PhoneGap library and jQuery mobile to really tap into the power of this. The sample project included with the download shows you just how simple it is to create projects in Visual Studio. The sample solution comes with an index.html file containing the HTML5 code, the Cordova (PhoneGap) library, jQuery libraries, and a JQuery style sheet: The html file is pretty straightforward. If you haven't experimented with JQuery mobile before, some of the attributes (such as data-role) might be new to you, but some quick Googling will fill in everything you need to know. The first part of the file builds a simple (but attractive) list with some links in it: The second part of the file is where things get interesting and it taps into the PhoneGap library. For instance, it gets the geolocation position by calling position.coords.latitude and position.coords.longitude: ...and then displays it in a simple span: Building is pretty simple, at least for Android (I'm not an iOS developer so I didn't look at that feature) - just configure the display name, version number, and package ID. There's no need to specify Android version; Nomad supports 2.2 and later. Enter these bits of information, click the new "Build for Android" button (not the regular Visual Studio Build link...) and you get a dialog box saying that your code is being built by their cloud build service (so no building while away from a WiFi signal apparently). After a couple minutes you wind up with a .apk file that can be copied over to your device. Applications built with Nomad for Android currently use a temporary certificate, so you can test the app on your devices but you cannot publish them in the Google Play Store (yet). And I love the "success" dialog box: Since Nomad is still in Beta, no pricing plans have been announced yet, so I'll be curious to see if this becomes a cost-effective solution to mobile app development. If it is, I may even be tempted to spring for the $99 iOS membership fee! In the meantime, I plan to work on porting some of my apps over to it and seeing how they work. My only quibble at this time is the lack of a centralized documentation location - I'd like to at least see which (if any) features of JQuery and PhoneGap are limited or not supported. Also, some notes on targeting different Android screen sizes would be nice, but it's relatively easy to find jQuery examples out on the InterWebs. Oh well, trial and error! You can download the Nomad extension for Visual Studio by going to their web site: www.vsnomad.com. Technorati Tags: Android, Nomad

    Read the article

  • Cloud Apps News @#OOW12

    - by Natalia Rachelson
    All eyes were on Oracle this past week and the news cycle was in full swing. What better time to make some key announcements that were guaranteed to create buzz ... and so we did. The name of the game was Cloud! Here are the key Cloud announcements for Apps, which included Fusion Tap that enables mobility across all Cloud Apps, HCM customer momentum in the Cloud, and our very first ERP Cloud Services customer. Oracle Unveils Oracle Fusion Tap for the iPadOracle Fusion Tap - Productivity Amplified Anywhere, Anytime "Both the enterprise and technology providers must recognize the need to innovate and adapt for the increasing mobility of the workforce - not just for sales teams, but across the organization," said Carter Lusher, Research Fellow and Chief Analyst of Enterprise Applications Ecosystem, Ovum. "A mobile application that quickly and powerfully allows employees to make connections, analyze data, and complete activities at any time and wherever they may be located drives new levels of business value and enhances efficiency. Frankly, mobile access is no longer a 'nice to have' but a 'must have.'"  "The mobile workforce is a business reality, and Oracle Fusion Tap is an example of how Oracle delivers mobile and cloud innovations that fundamentally improve productivity and how we work," said Chris Leone, Senior Vice President of Application Development, Oracle. "With Oracle Fusion Tap users will have an all-in-one, easily extensible app that puts mission-critical data and colleague connection at their fingertips." The entire release is available here http://www.oracle.com/us/corporate/press/1855392 Customers Live on Oracle Fusion Human Capital ManagementOracle HCM Cloud Service Helps Power HR's Contribution to the Business "More than 25 of the 100-plus customers who have selected Oracle Fusion Human Capital Management (HCM) are already live. Ardent Leisure, Peach Aviation, Toshiba Medical Systems and Zillow have deployed Oracle HCM Cloud Service and are using it to transform their HR operations. They join companies such as Principal Financial Group and Elizabeth Arden, who are already using Oracle HCM Cloud Service to help manage international growth and deliver pervasive, role-based, configurable solutions to their employees. With these recent go-lives, Oracle takes a leading position in successfully bringing live HCM customers in the cloud."  "As a technology company, Zillow looked to a partner who could scale with us. Zillow has gone live on Oracle HCM Cloud Service, which will give us the ability automate and streamline HR operations for our employees in the near future," said Sarah Bilton, Senior Director HR, Zillow. Read the entire release here http://www.oracle.com/us/corporate/press/1859573 Lending Club Selects Oracle ERP Cloud Service to Help Increase Insight and EfficienciesOracle ERP Cloud Service Provides an Open Architecture, Best-of-Breed Decision-Making, and Scalability in the Cloud "Lending Club, the leading platform for investing in and obtaining personal loans, has selected Oracle ERP Cloud Service to help improve decision-making and workflow, implement robust reporting, and take advantage of the inherent scalability and cost savings provided by the cloud. With more than 76,000 borrowers and 90,000 investors Lending Club utilizes technology and innovation to reduce the cost of traditional banking and offer borrowers better rates and investors better returns.  After an extensive search, Lending Club selected Oracle ERP Cloud Service due to the breadth and depth of capabilities and ongoing innovation of Oracle ERP Cloud Service, as well as Oracle's open architecture, industry leadership and commitment to partners." "Lending Club is an innovative, data-intensive, high-growth company and we needed a solution and partner that could match us," said Carrie Dolan, CFO, Lending Club. "We conducted a thorough review of our options, and Oracle ERP Cloud Service was the clear winner in terms of capabilities and business value as well as commitment to us as a customer." Read the entire release here http://www.oracle.com/us/corporate/press/1859020

    Read the article

  • Apps UX Launches Blueprints for Mobile User Experiences

    - by mvaughan
    By Misha Vaughan, Oracle Applications User ExperienceAt Oracle OpenWorld 2012 this year, the Oracle Applications User Experience (Apps UX) team announced the release of Mobile User Experience Functional Design Patterns. These patterns are designed to work directly with Oracle’s Fusion Middleware, specifically, ADF Mobile.  The Oracle Application Development Framework for mobile users enables developers to build one application that can be deployed to multiple mobile device platforms. These same mobile design patterns provide the guidance for Oracle teams to develop Fusion Mobile expenses. Application developers can use Oracle’s mobile design patterns to design iPhone, Android, or browser-based smartphone applications. We are sharing our mobile design patterns and their baked-in, scientifically proven usability to enable Oracle customers and partners to build mobile applications quickly.A different way of thinking and designing. Lynn Rampoldi-Hnilo, Senior Manager of Mobile User Experiences for Apps UX, says mobile design has to be compelling. “It needs to be optimized for the device, and be visually rich and simple,” she said. “What is really key is that you are designing for a user’s most personal device, the device that they will have with them at all times of the day.”Katy Massucco, director of the overall design patterns site, said: “You need to start with a simplified task flow. Everything should be a natural interaction. The action should be relevant and leveraging the device. It should be seamless.”She suggests that developers identify the essential tasks that a user would want to do while mobile. “They need to understand the user and the context,” she added. ?A sample inline action design patternWhat people are sayingReactions to the release of the design patterns have been positive. Debra Lilley, Oracle ACE Director and Fusion User Experience Advocate (FXA), has already demo’ed Fusion Mobile Expenses widely.  Fellow Oracle Ace Director Ronald van Luttikhuizen, called it a “cool demo by @debralilley of the new mobile expenses app.” FXA member Floyd Teter says he is already cooking up some plans for using mobile design patterns.  We hope to see those ideas at Collaborate or ODTUG in 2013. For another perspective on why user experience is such an important focus for mobile applications, check out this video by John King, Director, and Monty Latiolais, President, both from ODTUG, or the Oracle Development Tools User Group.In a separate interview by e-mail, Latiolais wrote: “I enjoy the fact we can take something that, in the past, has been largely subjective, and now apply to it a scientifically proven look and feel. Trusting Oracle’s UX Design Patterns, the presentation really can become one less thing to worry about. As someone with limited ADF experience, that is extremely beneficial.”?King, who was also interviewed by e-mail, wrote: “User Experience is about making the task at hand as easy and error-free as possible. Oracle's UX labs worked hard to make the User Experience in the new Fusion Applications as good as possible; ADF makes adding tested, consistent, user experiences a declarative exercise by leveraging that work. As we move applications onto mobile platforms, user experience is the driving factor. Customers are "spoiled" by a bevy of fantastic applications, and ours cannot disappoint them. Creating applications that enable users to quickly and effectively accomplish whatever task is at hand takes thought and practice. Developers must become ’power users’ and then create applications that they and their users will love.”

    Read the article

  • Using WKA in Large Coherence Clusters (Disabling Multicast)

    - by jpurdy
    Disabling hardware multicast (by configuring well-known addresses aka WKA) will place significant stress on the network. For messages that must be sent to multiple servers, rather than having a server send a single packet to the switch and having the switch broadcast that packet to the rest of the cluster, the server must send a packet to each of the other servers. While hardware varies significantly, consider that a server with a single gigabit connection can send at most ~70,000 packets per second. To continue with some concrete numbers, in a cluster with 500 members, that means that each server can send at most 140 cluster-wide messages per second. And if there are 10 cluster members on each physical machine, that number shrinks to 14 cluster-wide messages per second (or with only mild hyperbole, roughly zero). It is also important to keep in mind that network I/O is not only expensive in terms of the network itself, but also the consumption of CPU required to send (or receive) a message (due to things like copying the packet bytes, processing a interrupt, etc). Fortunately, Coherence is designed to rely primarily on point-to-point messages, but there are some features that are inherently one-to-many: Announcing the arrival or departure of a member Updating partition assignment maps across the cluster Creating or destroying a NamedCache Invalidating a cache entry from a large number of client-side near caches Distributing a filter-based request across the full set of cache servers (e.g. queries, aggregators and entry processors) Invoking clear() on a NamedCache The first few of these are operations that are primarily routed through a single senior member, and also occur infrequently, so they usually are not a primary consideration. There are cases, however, where the load from introducing new members can be substantial (to the point of destabilizing the cluster). Consider the case where cluster in the first paragraph grows from 500 members to 1000 members (holding the number of physical machines constant). During this period, there will be 500 new member introductions, each of which may consist of several cluster-wide operations (for the cluster membership itself as well as the partitioned cache services, replicated cache services, invocation services, management services, etc). Note that all of these introductions will route through that one senior member, which is sharing its network bandwidth with several other members (which will be communicating to a lesser degree with other members throughout this process). While each service may have a distinct senior member, there's a good chance during initial startup that a single member will be the senior for all services (if those services start on the senior before the second member joins the cluster). It's obvious that this could cause CPU and/or network starvation. In the current release of Coherence (3.7.1.3 as of this writing), the pure unicast code path also has less sophisticated flow-control for cluster-wide messages (compared to the multicast-enabled code path), which may also result in significant heap consumption on the senior member's JVM (from the message backlog). This is almost never a problem in practice, but with sufficient CPU or network starvation, it could become critical. For the non-operational concerns (near caches, queries, etc), the application itself will determine how much load is placed on the cluster. Applications intended for deployment in a pure unicast environment should be careful to avoid excessive dependence on these features. Even in an environment with multicast support, these operations may scale poorly since even with a constant request rate, the underlying workload will increase at roughly the same rate as the underlying resources are added. Unless there is an infrastructural requirement to the contrary, multicast should be enabled. If it can't be enabled, care should be taken to ensure the added overhead doesn't lead to performance or stability issues. This is particularly crucial in large clusters.

    Read the article

  • Working with Tile Notifications in Windows 8 Store Apps – Part I

    - by dwahlin
    One of the features that really makes Windows 8 apps stand out from others is the tile functionality on the start screen. While icons allow a user to start an application, tiles provide a more engaging way to engage the user and draw them into an application. Examples of “live” tiles on part of my current start screen are shown next: I’ll admit that if you get enough of these tiles going the start screen can actually be a bit distracting. Fortunately, a user can easily disable a live tile by right-clicking on it or pressing and holding a tile on a touch device and then selecting Turn live tile off from the AppBar: The can also make a wide tile smaller (into a square tile) or make a square tile bigger assuming the application supports both squares and rectangles. In this post I’ll walk through how to add tile notification functionality into an application. Both XAML/C# and HTML/JavaScript apps support live tiles and I’ll show the code for both options.   Understanding Tile Templates The first thing you need to know if you want to add custom tile functionality (live tiles) into your application is that there is a collection of tile templates available out-of-the-box. Each tile template has XML associated with it that you need to load, update with your custom data, and then feed into a tile update manager. By doing that you can control what shows in your app’s tile on the Windows 8 start screen. So how do you learn more about the different tile templates and their respective XML? Fortunately, Microsoft has a nice documentation page in the Windows 8 Store SDK. Visit http://msdn.microsoft.com/en-us/library/windows/apps/hh761491.aspx to see a complete list of square and wide/rectangular tile templates that you can use. Looking through the templates you’ll It has the following XML template associated with it:  <tile> <visual> <binding template="TileSquareBlock"> <text id="1">Text Field 1</text> <text id="2">Text Field 2</text> </binding> </visual> </tile> An example of a wide/rectangular tile template is shown next:    <tile> <visual> <binding template="TileWideImageAndText01"> <image id="1" src="image1.png" alt="alt text"/> <text id="1">Text Field 1</text> </binding> </visual> </tile>   To use these tile templates (or others you find interesting), update their content, and get them to show for your app’s tile on the Windows 8 start screen you’ll need to perform the following steps: Define the tile template to use in your app Load the tile template’s XML into memory Modify the children of the <binding> tag Feed the modified tile XML into a new TileNotification instance Feed the TileNotification instance into the Update() method of the TileUpdateManager In the remainder of the post I’ll walk through each of the steps listed above to provide wide and square tile notifications for an application. The wide tile that’s shown will show an image and text while the square tile will only show text. If you’re going to provide custom tile notifications it’s recommended that you provide wide and square tiles since users can switch between the two of them directly on the start screen. Note: When working with tile notifications it’s possible to manipulate and update a tile’s XML template without having to know XML parsing techniques. This can be accomplished using some C# notification extension classes that are available. In this post I’m going to focus on working with tile notifications using an XML parser so that the focus is on the steps required to add notifications to the Windows 8 start screen rather than on external extension classes. You can access the extension classes in the Windows 8 samples gallery if you’re interested.   Steps to Create Custom App Tile Notifications   Step 1: Define the tile template to use in your app Although you can cut-and-paste a tile template’s XML directly into your C# or HTML/JavaScript Windows store app and then parse it using an XML parser, it’s easier to use the built-in TileTemplateType enumeration from the Windows.UI.Notifications namespace. It provides direct access to the XML for the various templates so once you locate a template you like in the documentation (mentioned above), simplify reference it:HTML/JavaScript var notifications = Windows.UI.Notifications; var template = notifications.TileTemplateType.tileWideImageAndText01; .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; }   XAML/C# var template = TileTemplateType.TileWideImageAndText01;   Step 2: Load the tile template’s XML into memory Once the target template’s XML is identified, load it into memory using the TileUpdateManager’s GetTemplateContent() method. This method parses the template XML and returns an XmlDocument object:   HTML/JavaScript   var tileXml = notifications.TileUpdateManager.getTemplateContent(template); .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; }   XAML/C#  var tileXml = TileUpdateManager.GetTemplateContent(template);   Step 3: Modify the children of the <binding> tag Once the XML for a given template is loaded into memory you need to locate the appropriate <image> and/or <text> elements in the XML and update them with your app data. This can be done using standard XML DOM manipulation techniques. The example code below locates the image folder and loads the path to an image file located in the project into it’s inner text. The code also creates a square tile that consists of text, updates it’s <text> element, and then imports and appends it into the wide tile’s XML.   HTML/JavaScript var image = tileXml.selectSingleNode('//image[@id="1"]'); image.setAttribute('src', 'ms-appx:///images/' + imageFile); image.setAttribute('alt', 'Live Tile'); var squareTemplate = notifications.TileTemplateType.tileSquareText04; var squareTileXml = notifications.TileUpdateManager.getTemplateContent(squareTemplate); var squareTileTextAttributes = squareTileXml.selectSingleNode('//text[@id="1"]'); squareTileTextAttributes.appendChild(squareTileXml.createTextNode(content)); var node = tileXml.importNode(squareTileXml.selectSingleNode('//binding'), true); tileXml.selectSingleNode('//visual').appendChild(node); .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; }   XAML/C#var tileXml = TileUpdateManager.GetTemplateContent(template); var text = tileXml.SelectSingleNode("//text[@id='1']"); text.AppendChild(tileXml.CreateTextNode(content)); var image = (XmlElement)tileXml.SelectSingleNode("//image[@id='1']"); image.SetAttribute("src", "ms-appx:///Assets/" + imageFile); image.SetAttribute("alt", "Live Tile"); Debug.WriteLine(image.GetXml()); var squareTemplate = TileTemplateType.TileSquareText04; var squareTileXml = TileUpdateManager.GetTemplateContent(squareTemplate); var squareTileTextAttributes = squareTileXml.SelectSingleNode("//text[@id='1']"); squareTileTextAttributes.AppendChild(squareTileXml.CreateTextNode(content)); var node = tileXml.ImportNode(squareTileXml.SelectSingleNode("//binding"), true); tileXml.SelectSingleNode("//visual").AppendChild(node);  Step 4: Feed the modified tile XML into a new TileNotification instance Now that the XML data has been updated with the desired text and images, it’s time to load the XmlDocument object into a new TileNotification instance:   HTML/JavaScript var tileNotification = new notifications.TileNotification(tileXml); .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; }   XAML/C#var tileNotification = new TileNotification(tileXml);  Step 5: Feed the TileNotification instance into the Update() method of the TileUpdateManager Once the TileNotification instance has been created and the XmlDocument has been passed to its constructor, it needs to be passed to the Update() method of a TileUpdator in order to be shown on the Windows 8 start screen:   HTML/JavaScript notifications.TileUpdateManager.createTileUpdaterForApplication().update(tileNotification); .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; }   XAML/C#TileUpdateManager.CreateTileUpdaterForApplication().Update(tileNotification);    Once the tile notification is updated it’ll show up on the start screen. An example of the wide and square tiles created with the included demo code are shown next:     Download the HTML/JavaScript and XAML/C# sample application here. In the next post in this series I’ll walk through how to queue multiple tiles and clear a queue.

    Read the article

  • Favourite Open Source iPhone apps

    - by objektivs
    I'm an aspiring iPhone developer and I'm looking for a significant OS iPhone codebase to see how others build apps. I'm especially interested in examples exhibiting some or all of the following: business/enterprise apps apps that interact with web services apps utilising XML apps using oauth or other authenticate Personally, I'm less interested in games, but feel free to include any examples for the benefit of others. I'm asking here because the usual places I've been looking (i.e. sourceforge) don't seem to have the kind of examples I'm looking for.

    Read the article

  • How best to use XPath with very large XML files in .NET?

    - by glenatron
    I need to do some processing on fairly large XML files ( large here being potentially upwards of a gigabyte ) in C# including performing some complex xpath queries. The problem I have is that the standard way I would normally do this through the System.XML libraries likes to load the whole file into memory before it does anything with it, which can cause memory problems with files of this size. I don't need to be updating the files at all just reading them and querying the data contained in them. Some of the XPath queries are quite involved and go across several levels of parent-child type relationship - I'm not sure whether this will affect the ability to use a stream reader rather than loading the data into memory as a block. One way I can see of making it work is to perform the simple analysis using a stream-based approach and perhaps wrapping the XPath statements into XSLT transformations that I could run across the files afterward, although it seems a little convoluted. Alternately I know that there are some elements that the XPath queries will not run across, so I guess I could break the document up into a series of smaller fragments based on it's original tree structure, which could perhaps be small enough to process in memory without causing too much havoc. I've tried to explain my objective here so if I'm barking up totally the wrong tree in terms of general approach I'm sure you folks can set me right...

    Read the article

  • What's the best way to transfer a large dataset over a .NET web service?

    - by Malvineous
    I've inherited a C# .NET application which talks to a web service, and the web service talks to an Oracle database. I need to add an export function to the UI, to produce an Excel spreadsheet of some of the data. I have created a web service function to run a database query, load the data into a DataTable and then return it, which works fine for a small number of rows. However there is enough data in the full run that the client application locks up for a few minutes and then returns a timeout error. Obviously this isn't the best way to retrieve such a large dataset. Before I go ahead and come up with some dodgy way of splitting the call, I'm wondering if there is already something in place that can handle this. At the moment I'm thinking of a startExport function then repeatedly calling a next50Rows function until there is no data left, but because web services are stateless this means I'm going to have to keep some sort of ID number around and deal with the associated permissions. It would mean that I don't have to load the entire data set into the web server's memory though, which is one good thing. So if anyone knows a better way to retrieve a large amount of data (in a table format) over a .NET web service, please let me know!

    Read the article

  • Using Durandal to Create Single Page Apps

    - by Stephen.Walther
    A few days ago, I gave a talk on building Single Page Apps on the Microsoft Stack. In that talk, I recommended that people use Knockout, Sammy, and RequireJS to build their presentation layer and use the ASP.NET Web API to expose data from their server. After I gave the talk, several people contacted me and suggested that I investigate a new open-source JavaScript library named Durandal. Durandal stitches together Knockout, Sammy, and RequireJS to make it easier to use these technologies together. In this blog entry, I want to provide a brief walkthrough of using Durandal to create a simple Single Page App. I am going to demonstrate how you can create a simple Movies App which contains (virtual) pages for viewing a list of movies, adding new movies, and viewing movie details. The goal of this blog entry is to give you a sense of what it is like to build apps with Durandal. Installing Durandal First things first. How do you get Durandal? The GitHub project for Durandal is located here: https://github.com/BlueSpire/Durandal The Wiki — located at the GitHub project — contains all of the current documentation for Durandal. Currently, the documentation is a little sparse, but it is enough to get you started. Instead of downloading the Durandal source from GitHub, a better option for getting started with Durandal is to install one of the Durandal NuGet packages. I built the Movies App described in this blog entry by first creating a new ASP.NET MVC 4 Web Application with the Basic Template. Next, I executed the following command from the Package Manager Console: Install-Package Durandal.StarterKit As you can see from the screenshot of the Package Manager Console above, the Durandal Starter Kit package has several dependencies including: · jQuery · Knockout · Sammy · Twitter Bootstrap The Durandal Starter Kit package includes a sample Durandal application. You can get to the Starter Kit app by navigating to the Durandal controller. Unfortunately, when I first tried to run the Starter Kit app, I got an error because the Starter Kit is hard-coded to use a particular version of jQuery which is already out of date. You can fix this issue by modifying the App_Start\DurandalBundleConfig.cs file so it is jQuery version agnostic like this: bundles.Add( new ScriptBundle("~/scripts/vendor") .Include("~/Scripts/jquery-{version}.js") .Include("~/Scripts/knockout-{version}.js") .Include("~/Scripts/sammy-{version}.js") // .Include("~/Scripts/jquery-1.9.0.min.js") // .Include("~/Scripts/knockout-2.2.1.js") // .Include("~/Scripts/sammy-0.7.4.min.js") .Include("~/Scripts/bootstrap.min.js") ); The recommendation is that you create a Durandal app in a folder off your project root named App. The App folder in the Starter Kit contains the following subfolders and files: · durandal – This folder contains the actual durandal JavaScript library. · viewmodels – This folder contains all of your application’s view models. · views – This folder contains all of your application’s views. · main.js — This file contains all of the JavaScript startup code for your app including the client-side routing configuration. · main-built.js – This file contains an optimized version of your application. You need to build this file by using the RequireJS optimizer (unfortunately, before you can run the optimizer, you must first install NodeJS). For the purpose of this blog entry, I wanted to start from scratch when building the Movies app, so I deleted all of these files and folders except for the durandal folder which contains the durandal library. Creating the ASP.NET MVC Controller and View A Durandal app is built using a single server-side ASP.NET MVC controller and ASP.NET MVC view. A Durandal app is a Single Page App. When you navigate between pages, you are not navigating to new pages on the server. Instead, you are loading new virtual pages into the one-and-only-one server-side view. For the Movies app, I created the following ASP.NET MVC Home controller: public class HomeController : Controller { public ActionResult Index() { return View(); } } There is nothing special about the Home controller – it is as basic as it gets. Next, I created the following server-side ASP.NET view. This is the one-and-only server-side view used by the Movies app: @{ Layout = null; } <!DOCTYPE html> <html> <head> <title>Index</title> </head> <body> <div id="applicationHost"> Loading app.... </div> @Scripts.Render("~/scripts/vendor") <script type="text/javascript" src="~/App/durandal/amd/require.js" data-main="/App/main"></script> </body> </html> Notice that I set the Layout property for the view to the value null. If you neglect to do this, then the default ASP.NET MVC layout will be applied to the view and you will get the <!DOCTYPE> and opening and closing <html> tags twice. Next, notice that the view contains a DIV element with the Id applicationHost. This marks the area where virtual pages are loaded. When you navigate from page to page in a Durandal app, HTML page fragments are retrieved from the server and stuck in the applicationHost DIV element. Inside the applicationHost element, you can place any content which you want to display when a Durandal app is starting up. For example, you can create a fancy splash screen. I opted for simply displaying the text “Loading app…”: Next, notice the view above includes a call to the Scripts.Render() helper. This helper renders out all of the JavaScript files required by the Durandal library such as jQuery and Knockout. Remember to fix the App_Start\DurandalBundleConfig.cs as described above or Durandal will attempt to load an old version of jQuery and throw a JavaScript exception and stop working. Your application JavaScript code is not included in the scripts rendered by the Scripts.Render helper. Your application code is loaded dynamically by RequireJS with the help of the following SCRIPT element located at the bottom of the view: <script type="text/javascript" src="~/App/durandal/amd/require.js" data-main="/App/main"></script> The data-main attribute on the SCRIPT element causes RequireJS to load your /app/main.js JavaScript file to kick-off your Durandal app. Creating the Durandal Main.js File The Durandal Main.js JavaScript file, located in your App folder, contains all of the code required to configure the behavior of Durandal. Here’s what the Main.js file looks like in the case of the Movies app: require.config({ paths: { 'text': 'durandal/amd/text' } }); define(function (require) { var app = require('durandal/app'), viewLocator = require('durandal/viewLocator'), system = require('durandal/system'), router = require('durandal/plugins/router'); //>>excludeStart("build", true); system.debug(true); //>>excludeEnd("build"); app.start().then(function () { //Replace 'viewmodels' in the moduleId with 'views' to locate the view. //Look for partial views in a 'views' folder in the root. viewLocator.useConvention(); //configure routing router.useConvention(); router.mapNav("movies/show"); router.mapNav("movies/add"); router.mapNav("movies/details/:id"); app.adaptToDevice(); //Show the app by setting the root view model for our application with a transition. app.setRoot('viewmodels/shell', 'entrance'); }); }); There are three important things to notice about the main.js file above. First, notice that it contains a section which enables debugging which looks like this: //>>excludeStart(“build”, true); system.debug(true); //>>excludeEnd(“build”); This code enables debugging for your Durandal app which is very useful when things go wrong. When you call system.debug(true), Durandal writes out debugging information to your browser JavaScript console. For example, you can use the debugging information to diagnose issues with your client-side routes: (The funny looking //> symbols around the system.debug() call are RequireJS optimizer pragmas). The main.js file is also the place where you configure your client-side routes. In the case of the Movies app, the main.js file is used to configure routes for three page: the movies show, add, and details pages. //configure routing router.useConvention(); router.mapNav("movies/show"); router.mapNav("movies/add"); router.mapNav("movies/details/:id");   The route for movie details includes a route parameter named id. Later, we will use the id parameter to lookup and display the details for the right movie. Finally, the main.js file above contains the following line of code: //Show the app by setting the root view model for our application with a transition. app.setRoot('viewmodels/shell', 'entrance'); This line of code causes Durandal to load up a JavaScript file named shell.js and an HTML fragment named shell.html. I’ll discuss the shell in the next section. Creating the Durandal Shell You can think of the Durandal shell as the layout or master page for a Durandal app. The shell is where you put all of the content which you want to remain constant as a user navigates from virtual page to virtual page. For example, the shell is a great place to put your website logo and navigation links. The Durandal shell is composed from two parts: a JavaScript file and an HTML file. Here’s what the HTML file looks like for the Movies app: <h1>Movies App</h1> <div class="container-fluid page-host"> <!--ko compose: { model: router.activeItem, //wiring the router afterCompose: router.afterCompose, //wiring the router transition:'entrance', //use the 'entrance' transition when switching views cacheViews:true //telling composition to keep views in the dom, and reuse them (only a good idea with singleton view models) }--><!--/ko--> </div> And here is what the JavaScript file looks like: define(function (require) { var router = require('durandal/plugins/router'); return { router: router, activate: function () { return router.activate('movies/show'); } }; }); The JavaScript file contains the view model for the shell. This view model returns the Durandal router so you can access the list of configured routes from your shell. Notice that the JavaScript file includes a function named activate(). This function loads the movies/show page as the first page in the Movies app. If you want to create a different default Durandal page, then pass the name of a different age to the router.activate() method. Creating the Movies Show Page Durandal pages are created out of a view model and a view. The view model contains all of the data and view logic required for the view. The view contains all of the HTML markup for rendering the view model. Let’s start with the movies show page. The movies show page displays a list of movies. The view model for the show page looks like this: define(function (require) { var moviesRepository = require("repositories/moviesRepository"); return { movies: ko.observable(), activate: function() { this.movies(moviesRepository.listMovies()); } }; }); You create a view model by defining a new RequireJS module (see http://requirejs.org). You create a RequireJS module by placing all of your JavaScript code into an anonymous function passed to the RequireJS define() method. A RequireJS module has two parts. You retrieve all of the modules which your module requires at the top of your module. The code above depends on another RequireJS module named repositories/moviesRepository. Next, you return the implementation of your module. The code above returns a JavaScript object which contains a property named movies and a method named activate. The activate() method is a magic method which Durandal calls whenever it activates your view model. Your view model is activated whenever you navigate to a page which uses it. In the code above, the activate() method is used to get the list of movies from the movies repository and assign the list to the view model movies property. The HTML for the movies show page looks like this: <table> <thead> <tr> <th>Title</th><th>Director</th> </tr> </thead> <tbody data-bind="foreach:movies"> <tr> <td data-bind="text:title"></td> <td data-bind="text:director"></td> <td><a data-bind="attr:{href:'#/movies/details/'+id}">Details</a></td> </tr> </tbody> </table> <a href="#/movies/add">Add Movie</a> Notice that this is an HTML fragment. This fragment will be stuffed into the page-host DIV element in the shell.html file which is stuffed, in turn, into the applicationHost DIV element in the server-side MVC view. The HTML markup above contains data-bind attributes used by Knockout to display the list of movies (To learn more about Knockout, visit http://knockoutjs.com). The list of movies from the view model is displayed in an HTML table. Notice that the page includes a link to a page for adding a new movie. The link uses the following URL which starts with a hash: #/movies/add. Because the link starts with a hash, clicking the link does not cause a request back to the server. Instead, you navigate to the movies/add page virtually. Creating the Movies Add Page The movies add page also consists of a view model and view. The add page enables you to add a new movie to the movie database. Here’s the view model for the add page: define(function (require) { var app = require('durandal/app'); var router = require('durandal/plugins/router'); var moviesRepository = require("repositories/moviesRepository"); return { movieToAdd: { title: ko.observable(), director: ko.observable() }, activate: function () { this.movieToAdd.title(""); this.movieToAdd.director(""); this._movieAdded = false; }, canDeactivate: function () { if (this._movieAdded == false) { return app.showMessage('Are you sure you want to leave this page?', 'Navigate', ['Yes', 'No']); } else { return true; } }, addMovie: function () { // Add movie to db moviesRepository.addMovie(ko.toJS(this.movieToAdd)); // flag new movie this._movieAdded = true; // return to list of movies router.navigateTo("#/movies/show"); } }; }); The view model contains one property named movieToAdd which is bound to the add movie form. The view model also has the following three methods: 1. activate() – This method is called by Durandal when you navigate to the add movie page. The activate() method resets the add movie form by clearing out the movie title and director properties. 2. canDeactivate() – This method is called by Durandal when you attempt to navigate away from the add movie page. If you return false then navigation is cancelled. 3. addMovie() – This method executes when the add movie form is submitted. This code adds the new movie to the movie repository. I really like the Durandal canDeactivate() method. In the code above, I use the canDeactivate() method to show a warning to a user if they navigate away from the add movie page – either by clicking the Cancel button or by hitting the browser back button – before submitting the add movie form: The view for the add movie page looks like this: <form data-bind="submit:addMovie"> <fieldset> <legend>Add Movie</legend> <div> <label> Title: <input data-bind="value:movieToAdd.title" required /> </label> </div> <div> <label> Director: <input data-bind="value:movieToAdd.director" required /> </label> </div> <div> <input type="submit" value="Add" /> <a href="#/movies/show">Cancel</a> </div> </fieldset> </form> I am using Knockout to bind the movieToAdd property from the view model to the INPUT elements of the HTML form. Notice that the FORM element includes a data-bind attribute which invokes the addMovie() method from the view model when the HTML form is submitted. Creating the Movies Details Page You navigate to the movies details Page by clicking the Details link which appears next to each movie in the movies show page: The Details links pass the movie ids to the details page: #/movies/details/0 #/movies/details/1 #/movies/details/2 Here’s what the view model for the movies details page looks like: define(function (require) { var router = require('durandal/plugins/router'); var moviesRepository = require("repositories/moviesRepository"); return { movieToShow: { title: ko.observable(), director: ko.observable() }, activate: function (context) { // Grab movie from repository var movie = moviesRepository.getMovie(context.id); // Add to view model this.movieToShow.title(movie.title); this.movieToShow.director(movie.director); } }; }); Notice that the view model activate() method accepts a parameter named context. You can take advantage of the context parameter to retrieve route parameters such as the movie Id. In the code above, the context.id property is used to retrieve the correct movie from the movie repository and the movie is assigned to a property named movieToShow exposed by the view model. The movie details view displays the movieToShow property by taking advantage of Knockout bindings: <div> <h2 data-bind="text:movieToShow.title"></h2> directed by <span data-bind="text:movieToShow.director"></span> </div> Summary The goal of this blog entry was to walkthrough building a simple Single Page App using Durandal and to get a feel for what it is like to use this library. I really like how Durandal stitches together Knockout, Sammy, and RequireJS and establishes patterns for using these libraries to build Single Page Apps. Having a standard pattern which developers on a team can use to build new pages is super valuable. Once you get the hang of it, using Durandal to create new virtual pages is dead simple. Just define a new route, view model, and view and you are done. I also appreciate the fact that Durandal did not attempt to re-invent the wheel and that Durandal leverages existing JavaScript libraries such as Knockout, RequireJS, and Sammy. These existing libraries are powerful libraries and I have already invested a considerable amount of time in learning how to use them. Durandal makes it easier to use these libraries together without losing any of their power. Durandal has some additional interesting features which I have not had a chance to play with yet. For example, you can use the RequireJS optimizer to combine and minify all of a Durandal app’s code. Also, Durandal supports a way to create custom widgets (client-side controls) by composing widgets from a controller and view. You can download the code for the Movies app by clicking the following link (this is a Visual Studio 2012 project): Durandal Movie App

    Read the article

  • integration of dynamic forms for 3rd party web apps

    - by afr0
    I've a custom web forms definition interface where I user can define bespoke web forms and those webforms are then rendered on the other part of the my web app. It works well as I can render and submit my forms dynamically. However I have a scenario where there will be different 3rd party apps should be interacting with my custom forms. So the quesion arises how can I have my client side web forms and the fields within to work with the 3rd party interfaces on the fly. Any idea in that regard or best practice will be highly appreciated.

    Read the article

  • Cross-Domain calls using JavaScript in SharePoint Apps

    - by Sahil Malik
    SharePoint, WCF and Azure Trainings: more information Sounds simple enough right? You’ve probably done $.ajax, and jsonp? Yeah all that doesn’t work in SharePoint. The main reason being, those calls need to work under the app’s credentials. So instead here is what a SharePoint app does, It downloads a file called ~hostweburl/_layouts/15/SPRequestExecutor.js. This file creates an IFrame in your page which then downloads a file called ~appweburl/_layouts/15/AppWebproxy.aspx Then all calls that look like the below, are routed via AppWebProxy and run on the server under the apps identity. 1: var executor = new SP.RequestExecutor(this.appweburl); 2: var url = this.appweburl + "/_api/SP.AppContextSite(@target)/web?" + "@target='" + this.hostweburl + Read full article ....

    Read the article

  • Email a very large list of WordPress subscribers = fail (every single time)

    - by Greg-J
    I have tried using a number of plugins to email my 40,000 registered users on my WordPress-powered site, to no avail. I have tried Subscribe2 (seems to send some, but I have no idea how many) as well as a few Newsletter plugins. I either run out of memory trying to add 40K entries to the mail queue, or I error out trying to add 40K emails in the BCC of the email being sent. Is there anyone out there with a large subscriber-base that has found a successful solution? If so, please share.

    Read the article

  • Simplifying the process of compiling and running objective-c apps in GNUstep

    - by Matthew
    I just installed GNUstep (following this post: http://www.jaysonjc.com/programming/objective-c-programming-in-windows-gnustep-projectcenter.html) It says to run this code: gcc -o helloworld helloworld.m -I /GNUstep/System/Library/Headers -L /GNUstep/System/Library/Libraries -lobjc -lgnustep-base -fconstant-string-class=NSConstantString every time I want to compile. It works just fine for me. However as I'm learning and will be compiling/running apps way often (making little changes and trying again), I'd like a simpler way to do this. Is there an easier way to compile and then run the app? Or am I just being lazy?

    Read the article

  • Storing large data in HTTP Session (Java Application)

    - by Umesh Awasthi
    I am asking this question in continuation with http-session-or-database-approach. I am planning to follow this approach. When user add product to cart, create a Cart Model, add items to cart and save to DB. Convert Cart model to cart data and save it to HTTP session. Any update/ edit update underlying cart in DB and update data snap shot in Session. When user click on view cart page, just pick cart data from Session and display to customer. I have following queries regarding HTTP Session How good is it to store large data (Shopping Cart) in Session? How scalable this approach can be ? (With respect to Session) Won't my application going to eat and demand a lot of memory? Is my approach is fine or do i need to consider other points while designing this? Though, we can control what all cart data should be stored in the Session, but still we need to have certain information in cart data being stored in session?

    Read the article

  • Google I/O 2010 - Geospatial apps for desktop and mobile

    Google I/O 2010 - Geospatial apps for desktop and mobile Google I/O 2010 - Map once, map anywhere: Developing geospatial applications for both desktop and mobile Geo 201 Mano Marks As the number of desktop and mobile platforms proliferates the cost of developing and maintaining multiple versions of an application continues to increase. This session illustrates how the JS Maps API can be used to simplify cross platform geospatial application development by enabling a single implementation to be shared across multiple platforms, while maintaining a native look and feel. For all I/O 2010 sessions, please go to code.google.com From: GoogleDevelopers Views: 8 0 ratings Time: 01:00:58 More in Science & Technology

    Read the article

facebook twitter digg google delicious technorati stumbleupon myspace wordpress linkedin gmail igoogle windows live tumblr viadeo yahoo buzz yahoo mail yahoo bookmarks favorites email print

< Previous Page | 19 20 21 22 23 24 25 26 27 28 29 30  | Next Page >