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  • 1. Clouds and Web2.0 II: Case Study and Tutorial CTS08 Tutorial Hyatt Regency Irvine California May 19 2008 Geoffrey Fox, Marlon Pierce Community Grids Laboratory, School of informatics Indiana University http://www.infomall.org/multicore gcf@indiana.edu, http://www.infomall.org 1
  • 2. Polar Grid: A Web 2.0 Case Study Using Microformats, GeoRSS, REST, and KML Slides from Yu Ma
  • 3. More Detailed Information • See Marie’s blog: http://tethealla.blogspot.com/ • We use blogs in the lab extensively as lab books.
  • 4. PolarGrid Datasets • A typical processed dataset consists of: – One plain text header file describing the overall system and metadata of the particular chunk of measurements. – Multiple JPG images processed from the corresponding raw data. – Collection timestamp and fundamental properties such as waveform and transmitting (TX) /receiving (RX) antenna IDs are embedded in file names. • Images are processed by Kansas University’s Matlab-based code, GOAP
  • 5. Approaches • Convert unstructured metadata description into microformats. • Construct a relational database to enable fast and dynamic queries. • Provide geographic annotation embedded into web feeds that can be plotted by Google Maps and Google Earth • Technologies: – GeoRSS: RSS syndication with geo-location – Microformats: extensions to XHTML
  • 6. Microformat Conversion • Microformats capture “semantic” metadata information in XHTML format. • Principals for converted microformats: – Simple: capture the most basic information unit. – Reusable: capture shared features among data. – Composable: when combined, can reflect more complex relationships among data. • Most of our microformat classes are prefixed with “pg:” denoting the PolarGrid project namespace, except when existing generic ones such as the geo microformat are used.
  • 7. How To Extend XHTML • Use either <div> or <span> tags. • Display of these tags can be controlled with style sheets • You can also dynamically control these with JavaScript. • Next generation of browsers will have built-in support for well-known microformats such as hCard.
  • 8. Simple Example: Geo Format <span class="geo"> <span class="longitude">-2.193</span> <span class="latitude">52.686</span> </span>
  • 9. Polar Grid Microformat Examples • Simple descriptions: <span class="pg:radar-type">MCRDS</span> • Measurements with unit: <span class="pg:delay"> <span class="pg:value">2.5</span> <span class="pg:unit">us</span> </span>
  • 10. Microformat Examples • Identification for cross-references: <span class="pg:waveform”> <span class="pg:id">1</span> </span> • Commonly shared features: (e.g. both TX and RX antennas record same kind of information) <span class="pg:antenna"> <span class="pg:id">0</span> <span class="pg:type">TX/RX</span> <span class="pg:attenuation">0</span> </span>
  • 11. Microformat Examples • Structured collections/Arrays: <span class="pg:antenna-array"> <span class="pg:array- size">2</span> <span class="pg:antenna”> <span class="pg:id">0</span> <span class="pg:type">TX</span> <span class="pg:attenuation">0</span> </span> <span class="pg:antenna”> <span class="pg:id">1</span> <span class="pg:type">TX</span> <span class="pg:attenuation">0</span> </span> </span>
  • 12. Microformat Examples • Complex objects: (e.g. spatial and temporal information that uniquely defines a processed data chunk) <span class="pg:data-chunk"> <span class="pg:name">Start/Stop</span> <span class="pg:utc- timestamp">1202755351.892651</span> <span class="geo"> <span class="longitude">-2.193</span> <span class="latitude">52.686</span> </span> </span>
  • 13. GeoRSS-Simple Embedded Atom Feed <?xml version="1.0" encoding="utf-8"?> <feed xmlns="http://www.w3.org/2005/Atom" xmlns:georss="http://www.georss.org/georss"> <title>PolarGrid Expedition</title> <id>tag:pg3.ucs.indiana.edu,2008:polargrid-expedition-2008- 05</id> <updated>2008-05-11T02:02:54Z</updated> <author> <name>Polar Grid</name> </author> <link type="application/atom+xml" rel="self" href="http://pg3.ucs.indiana.edu/cgi-bin/getPolarGridFeed"/>
  • 14. GeoRSS-Simple Embedded Atom Feed <entry> <title>Data Chunk: 2008-03-11 11:55:41</title> <id>tag:pg3.ucs.indiana.edu,2008:polargrid expedition-2008- 05-262</id> <updated>2008-03-11T11:55:41Z</updated> <content type="html"> … (data chunk information described in microformats) … </content> <georss:point>77.585957 -52.448461</georss:point> <georss:point>77.580976 -52.435148</georss:point> </entry> </feed>
  • 15. Google RSS Feed Reader
  • 16. Google Maps
  • 17. Corresponding KML <?xml version="1.0" encoding="UTF-8"?> <kml xmlns="http://earth.google.com/kml/2.2"> <Document> <name>PolarGrid Expedition</name> <Placemark id="tag:pg3.ucs.indiana.edu,2008:polargrid-expedition- 2008-05-262”> <name>Data Chunk: 2008-03-11 11:55:41</name> <description><![CDATA[ … (data chunk information described in microformats) … ]]></description> <Point><coordinates>-52.448461,77.585957</coordinates></Point> <Point><coordinates>-52.435148,77.580976</coordinates></Point> </Placemark> </Document></kml>
  • 18. Google Earth and KML
  • 19. Web 2.0 Lessons • Web 2.0 approaches can be applied to management of scientific information. • With the right choices, you get a lot for free. • Microformats: simple ways to encode name-value pairs, build up semantic descriptions. • GeoRSS: orders data by both time and space – Works in all standard RSS/Atom readers. – Google Maps supports natively
  • 20. Web 2.0 Tutorial Map
  • 21. User Layer Browser + Browser + Browser + JavaScript JavaScript JavaScript Libraries Libraries Libraries AJAX, JSON, REST, RSS Gadgets, Server-Side Facebook Apps Gadget Gdata Apps Aggregators SOAP, REST, RSS Blogs, Social Gadget Calendars, Facebook Containers Docs, etc System Cloud Layer
  • 22. Map Key • Red blocks represent browsers and things that run in them (JavaScript). – This is the “user” level. – Client side mashups • Green blocks represent Web servers and their applications. – This is the “developer” level. – Server-side mashups. – These can run on any hosting environment: your web server, Amazon EC2, Google GAE, etc. • Blue blocks represent third party services. – This is the “system cloud” layer. • Arrows represent network communications. – Everything goes over HTTP – REST, AJAX: communication patterns. – RSS, ATOM, JSON, SOAP: message format.
  • 23. Using Google’s GData API How to Write Server-Side Mash- Ups
  • 24. GData: the API to Google Services • Google provides an extensive set of online services with well- known user interfaces. – Docs – Spreadsheet – YouTube – Blogger/Blogspot – Calendar – Picasso Photo Sharing – GMail • These have programming interfaces as well as user interfaces. – Server side: Java, .NET, PHP, Python – Client side: JavaScript • Client interfaces include visual components suitable for mash- ups • Server-side APIs don’t include visual components but do allow you to make server-side mash-ups.
  • 25. Server-Side Mash-Up Use Case • Imagine you have a Web service that runs a large parallel finite element code. – Output can include images, movies, output files, metadata, etc. – Your web service manages the interaction with the queuing system (another topic…) • With a server-side mash-up, your Web Service can – Post status information about your jobs (“Step 521 Completed!”) on your blog. – Post URLs pointing to your output files on your blog. – Upload your visualizations to Picasso and YouTube (and post links). – Generate RSS/Atom feeds of the above. – Post results to Google Calendar • We’ll look at some Java examples.
  • 26. Getting Started with GData • Create a Blog, make sure you can login to YouTube, etc. • You will need a clientID and associated developer key. – Get these from http://code.google.com/apis/base/signup.html. • Get the Java code – http://code.google.com/p/gdata-java-client/downloads/list • See any number of Google examples – http://code.google.com/apis/base/javadevguide.html • One trick: You can get your blogger ID by examining the your Blog’s Atom feed. – It will be in the header and look something like this: <id>tag:blogger.com,1999:blog-19457310</id> – The blog ID to use in the code below would be 19457310 in this example. • The full working example is here – http://communitygrids.blogspot.com/2008/03/googles-gdata-java- api.html – We will simplify for pedagogical reasons.
  • 27. Posting Results to Your Blogspot Blog String userName="me@gmail.com"; String password= "qwerty"; Replace these with your values String content=“…”; GoogleService myService= Login in new GoogleService("blogger",""); myService.setUserCredentials(userName,password); Create the entry to insert Entry myEntry = new Entry(); myEntry.setTitle(new PlainTextConstruct(title)); myEntry.setContent(new PlainTextConstruct(content)); Insert the new entry using REST’s POST URL postUrl = new URL("http://www.blogger.com/feeds/" + blogID + "/posts/default"); myService.insert(postUrl, myEntry);
  • 28. Getting a YouTube Feed String feedUrl="http://gdata.youtube.com/feeds/api/videos/"; String scarFace5sec="http://gdata.youtube.com/feeds/api/videos/egwB7hVIIE c"; YouTubeService service = new YouTubeService(clientID, developer_key); service.setUserCredentials(userName,password); VideoFeed videoFeed = youTubeService.getFeed(new URL(feedUrl),VideoFeed.class); VideoEntry videoEntry = youTubeService.getEntry(new URL(scarFace5sec), VideoEntry.class); //Loop over feed entries and display. String feedContent= "Title: " + videoEntry.getTitle().getPlainText()+”"; feedContent+=videoEntry.getMediaGroup().
  • 29. Posting To Google Calendar CalendarService calService=new CalendarService(clientID); calService.setUserCredentials(userName,password); Log in to the calendar service URL postUrl = new URL("http://www.google.com/calendar/feeds/"+userName+"/private/full"); CalendarEventEntry myEntry = new CalendarEventEntry(); myEntry.setTitle(new PlainTextConstruct(titleOfEvent)); Create a new Calendar entry myEntry.setContent(new PlainTextConstruct(contentToPost)); DateTime startTime = new DateTime(new Date()); When eventTimes = new When(); eventTimes.setStartTime(startTime); Create the event time and insert myEntry.addTime(eventTimes); CalendarEventEntry insertedEntry = calendarService.insert(postUrl, myEntry); CalendarEventEntry myEntry2 = new CalendarEventEntry(); String now=(new Date()).toString(); myEntry2.setContent(new PlainTextConstruct("Test post at "+now)); myEntry2.setQuickAdd(true); An alternative way to post the entry // Send the request and receive the response: CalendarEventEntry insertedEntry2 =calendarService.insert(postUrl, myEntry2);
  • 30. Some Other Things You Can Do with GData Server Code • YouTube – Search movies by keyword tag, “related”, categories – Upload and download movies. – Put movies into collections • Calendar – Retrieve events as RSS feed • Spreadsheet – Remotely retrieve and insert or change row and cell data. – Use structured queries to retrieve data ranges. – Remotely invoke batch operations
  • 31. Making FaceBook Applications Using Facebook as a backend service.
  • 32. Full Examples and More Detailed Notes • PHP and JavaScript notes – http://communitygrids.blogspot.com/2008/02/q uick-facebook-javascript-api-notes.html • JavaScript example: – http://communitygrids.blogspot.com/2008/02/li ttle-more-jsfacebook-hacking.html
  • 33. Why Use FaceBook as a Portal? • Because it has 10’s of millions of users. – The largest Web 2.0-style Web portal • Easy to create Social Networks: groups of friends and share applications, communicate, share information, etc. – And more importantly, tools for building and managing these networks • Can leverage many third party applications – For example, photo albums – Of course many of them are trivial, silly
  • 34. FaceBook APIs • These come in two flavors – Embedded: make your application available through FaceBook. • PHP APIs – Embedding: use Facebook authentication and social network data in your application. • JavaScript API • In both cases, you run your application on your Web server. – You application do anything you can implement. – And you can query FaceBook for social network information, user metadata.
  • 35. Using The JavaScript API • Getting Started: – You just need a Web server to host your application. – Register as a developer – Place Facebook’s xd_receiver.htm on your web server • Make sure the relative path used is correct. • What will happen? – Your page will run outside of Facebook. – Anyone loading your application will be directed to Facebook to login. – User is then redirected back to your page. • Your application can make calls back to Facebook. • And you can do anything else you want. – So you could embed this application in a portlet, interact with a local database, – You can build your application with .NET or Java Server Faces, etc.
  • 36. HTML Page Example <textarea style="width:500px;height:300px;" id="_traceTextBox"> </textarea> <script src="http://static.ak.facebook.com/js/api_lib/F acebookApi.debug.js" type="text/javascript"> var api = new FB.ApiClient('<your_key_here>', '/xd_receiver.htm', null); … </script>
  • 37. Interact with FaceBook api.requireLogin(function(exception) { api.friends_get(null,getResults); var myinfo= 'last_name, first_name, hometown_location, work_history, pic_small'; api.users_getInfo(api.get_session().uid, myinfo, getInfo); });
  • 38. Notes on Previous Slides • The requireLogin, friends_get, and users_getInfo are FaceBook API calls. • The getResults and getInfo methods are callback methods that I defined. – Shown in next slide • The myinfo data structure is taken from the Facebook XML user profile. – http://wiki.developers.facebook.com/index.php /Users.getInfo
  • 39. Developer Defined Call-Back Functions function getResults(result,exception) { Debug.dump(api.get_session().uid,’You'); Debug.dump(result,’Your Friends’); } function getInfo(result,exception) { Debug.dump(result,’Your info'); } These two methods receive the output returned from Facebook by the API’s friends_get() and users_getInfo() methods. The results are dumped to the text window but you can do more interesting things.
  • 40. Output Info Dumped to Text Area you: 627774031 Your friends: {Array} [Deleted] User’s Facebook ID and the ID numbers of his friends Your Info: {Array} [0]: {Object} first_name: Marlon hometown_location: {Object} city: state: User’s profile metadata. Note some fields are strings, some are country: Arrays, and some are structured objects of strings. zip: last_name: Pierce pic_small: http://profile.ak.facebook.com/profile6/1797/98/t627774031_2463.jpg uid: 627774031 work_history: {Object}
  • 41. Facebooks’ Query Language • All of the FaceBook API is basically a set of wrappers around their SQL like FQL query language. So you can, if you prefer, make custom methods out of FQL query strings. var myQuery='SELECT name FROM user WHERE uid='+api.get_session().uid; api.fql_query(myQuery, getFQLResponse); getFQLResponse() is a developer-written callback function
  • 42. Working with Facebook Groups • To list information about groups you are a member of, use the following. – You can replace the value of uid with any UID you know. – 18629081888 is the Group ID for the Open Grid Forum’s uninteresting Facebook group api.groups_get(api.get_session().uid,null,getGroup s); api.groups_getMembers(18629081888,getGroupM embers);
  • 43. More Information • The JavaScript documentation is available from here – http://wiki.developers.facebook.com/index.php /JavaScript_Client_Library • It is pretty minimal, but it is essentially the same as the better documented PHP API. – Replace PHP’s "." with a "_". – So PHP’s users.getInfo becomes users_getInfo(...) in JavaScript.
  • 44. Open Social API and Gadgets
  • 45. What Is a Gadget? Simple gadgets for getting a Grid proxy credential and running remote commands. Both run on my own Web server.
  • 46. Gadget Definition <?xml version="1.0" encoding="UTF-8" ?> <Module> <ModulePrefs title="MyProxy Gadget Example" scrolling="true" height="500"/> <Content type="url" href="http://156.56.104.143:8080/GTLAB/examples/MyProxyExample.j sf"> </Content> </Module> • This XML page is web accessible via http://156.56.104.143:8080/GTLAB/MyProxyGadget.x ml • This URL points to the actual application (written in JSF) • Google uses an HTML IFrame to load the page. • You can also use content type=“html” for more integrated applications. – For example, you can send messages between gadgets in the client.
  • 47. Gadgets and Open Social • Open Social is a consortium of Facebook’s major competitors. – Orkut, MySpace, Hi5, LinkedIn, Friendster, etc. • The Open Social API has two parts – JavaScript libraries for building social gadgets. • Must run in a gadget container (server) – REST APIs for exchanging data between container servers. • The ideas: – JS APIs let you make portable gadgets that will work in different containers (Hi5LinkedIn) but data will be different. – REST will let you export/import data.
  • 48. Getting Started • You need a Gadget container to host your gadgets. – LinkedIn is notably selective about the gadgets it will host. • Orkut provides a sandbox, but you have to upload your gadgets. • Apache Shindig is an extremely simple Java- based container. – De facto reference implementation of Open Social – Not suitable for production by a long ways. – But it will work on an air plane. • Shindig is something of a moving target. – My February notes were obsolete…
  • 49. Getting Started with Shindig • Visit the Web site for information – http://incubator.apache.org/shindig • Check out the code with SVN – mkdir $HOME/shindig; cd shindig – svn co http://svn.apache.org/repos/asf/incubator/shindig/trunk/ • Build and run it with Apache Maven – Run “mvn” from $HOME/shindig/ – Run “mvn -Prun” from $HOME/shindig/java/server • Point browser to http://localhost:8080/gadgets/files/container/sample1.html and look through other samples. – You can also load these HTML files using file:// if you don't want to run the Jetty server. • Periodically check for updates and rebuild – svn update • The READMEs have better/more up-to-date information than the website.
  • 50. What Do You Get? • Shindig actually has two major parts: – A container that can run social gadgets • This must have access to your user and social network database. – A gadget aggregator that displays gadgets • Runs the layout manager. • Think of this as your own iGoogle server. • Access the gadget container – http://localhost:8080/gadgets/files/samplecont ainer/samplecontainer.html
  • 51. The gadget is actually served remotely. This is the module definition. The gadget can be displayed in your http://localhost:8080 display container.
  • 52. Import JS Libraries into Container Page <link rel="stylesheet" href="gadgets.css"> <script type="text/javascript" src="../../js/rpc.js?c=1&debug=1"></script> <script type="text/javascript" src="cookies.js"></script> <script type="text/javascript" src="util.js"></script> <script type="text/javascript" src="gadgets.js"></script> <script type="text/javascript" src="cookiebaseduserprefstore.js"></script>
  • 53. Create Your Layout Manager var my = {}; Note gadgets are loaded from remote host containers. my.gadgetSpecUrls = [ 'http://www.google.com/ig/modules/horoscope.xml', 'http://www.google.com/ig/modules/aue07otr.xml', 'http://www.labpixies.com/campaigns/todo/todo.xml' ]; my.LayoutManager = function() { gadgets.LayoutManager.call(this); }; my.LayoutManager.inherits(gadgets.LayoutManager); my.LayoutManager.prototype.getGadgetChrome = function(gadget) { var chromeId = 'gadget-chrome-' + gadget.id; return chromeId ? document.getElementById(chromeId) : null; };
  • 54. Initialize and Render my.init = function() { gadgets.container.layoutManager = new my.LayoutManager(); }; my.renderGadgets = function() { for (var i = 0; i < my.gadgetSpecUrls.length; ++i) { var gadget = gadgets.container.createGadget( {specUrl: my.gadgetSpecUrls[i]}); gadgets.container.addGadget(gadget); gadgets.container.renderGadget(gadget); } };
  • 55. HTML Display <body onLoad="my.init();my.renderGadgets()"> <h2>Sample: Dynamic Height</h2> <div id="gadget-chrome-0" class="gadgets-gadget- chrome"></div> <div id="gadget-chrome-1" class="gadgets-gadget- chrome"></div> <div id="gadget-chrome-2" class="gadgets-gadget- chrome"></div> </body> Shows the 3 Gadgets. As we saw, this will use “flow” layout and “chrome” styling.
  • 56. Hosting Your Own Social Gadget • Place your widget code here: – $HOME/shindig/javascript/samplecontainer/exam ples • After compilation, these will be located here: – ./target/gadgets/files/samplecontainer/examples. • These will be served up from – http://localhost:8080/gadgets/files/samplecontain er/examples/myapp.xml • Myapp.xml is the gadget definition we saw earlier.
  • 57. Hello World Gadget in Container Uses flat XML file. User and his network of friends provided by the local container. “Hello” chosen based friend’s preferred http://localhost:8080/gadgets/files/samplecontainer/samplecontainer.html
  • 58. Shindig social network XML “database”. Real containers would use a real database. OpenSocial API essentially lets you retrieve this sort of data.
  • 59. my.gadgetSpecUrls = [ 'http://www.google.com/ig/modules/horoscope.xml', 'http://www.google.com/ig/modules/aue07otr.xml', 'http://localhost:8080/gadgets/files/samplecontainer/example s/SocialHelloWorld.xml' ];
  • 60. More Information • See http://communitygrids.blogspot.com for more detailed information. • Email: mpierce@cs.indiana.edu