Web Service Architecture

Transcript

1. Tuesday, 6 March 2012
2. ... because states with right angles are safer? Colorado Tuesday, 6 March 2012
3. Web Service Architecture Tuesday, 6 March 2012
4. what? Tuesday, 6 March 2012
5. a service is a model! • Traditional MVC frameworks assume that the model is a set of classes that talk to a database. • However, a service is also a kind of model. • Views don’t change • Controllers now call services, rather than directly accessing your data source. Tuesday, 6 March 2012
6. why? • Scalability • Management Tuesday, 6 March 2012
7. databases are dangerous! • SQL is complex, powerful. • Hard to manage SQL routines, stored procedures hide complexity. • No revision control. • Bad developers _will_ attempt to optimize their apps by bastardizing the model. • Most companies don’t have a DBA to manage database performance/access. Tuesday, 6 March 2012
8. • It’s all too easy to just add SQL call to a view. Front-end developers are used to this lexicon, because it’s more or less the same as making an AJAX call. • We all end up spend time refactoring code that belongs in a controller. Tuesday, 6 March 2012
9. how? Tuesday, 6 March 2012
10. what to migrate Tuesday, 6 March 2012
11. ....the good. • Anything that involves talking to a database. • Search. • KinoSearch Tuesday, 6 March 2012
12. ...the bad. • I18N • However it’s still beneficial to define an interface and stub classes. Tuesday, 6 March 2012
13. ...the ugly. • Content delivery? Tuesday, 6 March 2012
14. defining an API • I like to go old school: use-case, data-flow, UML. • You could use REST, JSON etc, but I’d suggest trying SOAP! • Define a WSDL file - even tho you don’t have to. • Version control for your interface • Language agnostic ( can use the same WSDL file to create Java, C#, php, etc stubs ). Tuesday, 6 March 2012
15. • Once you’ve defined your API and created your WSDL file, choosing whether or not to create a stub class is up to you. • If you do, you are likely to rework the generated class to your own preferences and patterns ( i.e. use Moose ). • If you don’t, you are going to incur the cost of opening & processing the WSDL file for each service call. Tuesday, 6 March 2012
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20. building stubs WSDL stubmaker.pl Operation Operation Attribute Attribute GetCamel Operation Operation Attribute Attribute Camel::Client Operation Operation Attribute Attribute Camel::Client Tuesday, 6 March 2012