Post-relational databases: What's wrong with web development? v3
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Pogledat ćemo kako se razvoj aplikacija mijenjao kroz vrijeme i koji je najjednostavniji način da napravimo web aplikaciju korištenjem JavaScript-a i JSON-a koji nam omogućavaju brz i jednostavan razvoj aplikacija uz pomoć Angulara i CouchDB-a. Cilj je napraviti aplikaciju za jedno popodne!
![NoSQL for great good [hanoi.rb talk]](https://cdn.slidesharecdn.com/ss_thumbnails/kvs-hanoirb-150728163935-lva1-app6891-thumbnail.jpg?width=560&fit=bounds)
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Post-relational databases: What's wrong with web development? v3
- 1. 1/18 Post-relational databases What's wrong with web development? Dobrica Pavlinušić http://blog.rot13.org WebUG, 2011-06-16
- 2. 2/18 Who am I? ● Web programming since 1995 using FLOSS ● Languages: php, perl, JavaScript ● Databases: PostgreSQL, MySQL, CouchDB ● 5+ years of expirience as system architect on large intranet content portal ● http://blog.rot13.org ● Big question: are we solving same problems over and over again? ● Model-View-Controller pattern
- 3. 3/18 Back in mainframe days... View serial Controller Model text text COBOL files Terminal Server ● All logic in COBOL application ● Similar to Clipper in DOS ● Payroll-type applications 1970 ... 1975 ... 1980 ... 1985 ... 1990 ... 1995 .. 2000 ... 2005 ... 2010
- 4. 4/18 GUI Client/Server RDBMS View Controller SQL GUI API Model 4GL ODBC RDBMS Client Server ● tabular normalized data (3NF) ● SQL to query and modify data (static schema) ● logic in controller and RDBMS (validation) 1970 ... 1975 ... 1980 ... 1985 ... 1990 ... 1995 .. 2000 ... 2005 ... 2010
- 5. 5/18 Internet! Web 1.0 View Controller HTTP Model HTML HTML PHP SQL RDBMS Browser Web server ● "network is computer" – browser thin client ● Logic in controller, RDBMS & view (JavaScript) ● Trees (XML)? Self-referencing data? 1970 ... 1975 ... 1980 ... 1985 ... 1990 ... 1995 .. 2000 ... 2005 ... 2010
- 6. 6/18 AJAX JSON REST Web2.0 View Controller Model HTTP HTML JSON JavaScript JSON JSON Browser 2.0 NoSQL server ● JSON without schema (or verification!) ● Logic in JavaScript on client and server ● Turtles all the way down reduces complexity 1970 ... 1975 ... 1980 ... 1985 ... 1990 ... 1995 .. 2000 ... 2005 ... 2010
- 7. 7/18 Perfect web stack ● HTTP REST API with JSON – GET, PUT/POST, DELETE ● JavaScript queries using map/reduce – Real-world dirty data from views ● Serve application from HTTP database (content-type support) ● Two-way data binding forms <-> JSON – HTML is only template we need! ● Single language: JavaScript (+jquery) ● "simple app in single afternoon" benchmark
- 8. 8/18 CouchDB ● Designed for replication over HTTP – applications replicatied with data (off-line) ● Custom views, requests and _changes feed
- 9. 9/18 <angular/> ● What if web browsers where written for web applications today? – html compiler inside browser – ng:repeat and friends to template objects – Objects persisted using REST to server ● http://docs.angularjs.org/ ● Demos – http://angularjs.org/slides/intro/#/8 – printer overview – conference submission app
- 10. 10/18 angular-mojolicious ● Mojolicious – web in the box (perl) – http://mojolicious.org/ ● Mojo::Client – chunked HTTP client – Perfrect for CouchDB integration ● https://github.com/dpavlin/angular-mojolicious ● REST API for Angular's $resource – CouchDB proxy or static JSON files ● Replication with getangular.com service – not API compliant, uses newer version ● Helpers to quickly prototype with angular
- 11. 11/18 Server-side templates ● Generate slips server-side using angular – PhanotomJS – headless WebKit browser – http://www.phantomjs.org/ – https://github.com/dpavlin/angular-uplatnica $ ./bin/phantomjs examples/rasterize.js 'http://localhost:3000/app/index.html#/uplatnica' uplatnica.pdf
- 12. 12/18 Pixel-exact PDF templates? ● Generate conference name tags – http://blog.rot13.org/2011/04/print-conference-name-tags-using-inkscape.html – Inkscape (SVG template) – pdfnup for to A4 page
- 13. 13/18 CouchDB triggers ● Finite-state machine inside document ● Multiple workers - FSM for lock and status ● filter, trigger, commit on _changes feed ● Perfect for async tasks – executing shell – sending e-mail
- 14. 14/18 CouchDB full-text search ● Implemented as filter-only trigger ● KinoSearch – full-text search, base for Apache lucy (Lucene in C) ● trigger which delete/add documents – Unroll structures into.flat.schema ● CouchDB external server to perform queries
- 15. 15/18 CouchDB related projects ● BigCouch – https://github.com/cloudant/bigcouch – Consistant hashing, sharding ● ElasticSearch – http://www.elasticsearch.com/ – CouchDB river ● GeoCouch – https://github.com/vmx/couchdb – Spartial index
- 16. 16/18 Riak (search) ● cluster of machines! ● Amazon's dynamo model – r,w – eventual consistency ● Multiple map/reduce phases in single query – Ad-hoc, not cached, in parallel over cluster ● post-commit hooks (search) ● Links (REST traversal) ● HTTP and ProcolBuffers interfaces ● http://www.basho.com/riaksearch.html
- 17. 17/18 Alternative JSON storage ● Raven DB – .Net platform – Linq Map/Reduce – RESTful JSON – http://ravendb.net/ ● PostgreSQL – Mostly tabular data? – hstore - key/value pairs – own HTTP/JSON app (ORM?) – http://www.postgresql.org/docs/9.0/static/hstore.html
- 18. 18/18 Overview ● Avoid complexity – Model: JSON – View: HTML – Controller: angular ● Solve offline problem: CouchDB – Attach async processes in the cloud! ● Generate pdfs server side Attack interesting problems – Tree-data, (social) networks