ZendCon 2012 - Writing Services with ZF2

ZF2 takes a different approach to services; there are several services out there and you should be providing the ability for ZF2 to integrate with this. ZF2 marries services with composer and a different packaging mechanism to ensure that services can be released without a specific framework version. This not only helps the framework but helps you prevent an API changing in between framework releases without having an issue of awaiting a framework release.

Transcript

1. Writing Services with ZF2 Mike Willbanks | Barnes & Noble
2. 2 Housekeeping… •  Talk  Slides will be posted after the talk. •  Me  Sr. Web Architect Manager at NOOK Developer  Open Source Contributor  Where you can find me: •  Twitter: mwillbanks G+: Mike Willbanks •  IRC (freenode): mwillbanks Blog: http://blog.digitalstruct.com •  GitHub: https://github.com/mwillbanks
3. 3 Agenda • Background • ZF2 Services • Writing a Service • Implementing your Service
4. Background…
5. 5 A Definition ZF 1 contained Zend_Service_* components
6. 6 Zend_Service_* Components were included in the core distribution
7. 7 Zend_Service_* Make it easy for people to have it available…
8. 8 1.11.13 Release Caused several issues
9. 9 Started Getting Messy…
10. Services in ZF2
11. 11 • RFC March 2012 “RFC Service Components”  http://framework.zend.com/wiki/display/ZFDEV2/RFC+-+Service +Components • Removal of ZF2 Zend\Service namespace into a separate namespace and repository. Changing for the Better
12. 12 • Ability to version separately from core framework • Easier to leverage outside of a ZF context • Encourage service providers to further contribute Goals of ZF2 Services
13. 13 • Independently versioned • Dependencies on framework versions (2.*, 2.0.*, 2.0.1) • Maintain dependencies by specific packages • Must follow ZF coding standards • Must be unique  A service that does the same thing should not already exist! Services for Contribution (Official Services)
14. 14 Service Component Lifecycle Discuss on Contributor Mailing List CR Team Review Fork Repo Build Component IRC Vote (Meeting Agenda) Publish!
15. 15 Service Maintenance • Must be maintained for the duration of major versions  Exceptions must be noted in the ChangeLog  Component should only state dependency on minor versions • Maintainers must attempt at all times to keep compatibility with the latest version  If unable to maintain, actively recruit, if still unable ZF or CR team will make a recommendation on the component.
16. 16 How are we doing so far?
17. Writing a Service By example of ZendService\Twitter
18. 18 • Services are really just like framework libraries  However, the namespace implies 3rd party integrations.  They are also organized like the framework. • Services should be reusable for other developers  Write it out based on the API and not just what you need. • Create reasonable dependencies  Zend\Http and Zend\Stdlib being most common. General Information
19. 19 • Modules are more specifically for ZF • Components are reusable libraries for any code base. • Base Rule  If it involves the MVC; it should more than likely be a module. Why Not Modules?
20. 20 • Build out the file structure:  library/ZendService/Twitter  tests/ZendService/Twitter • Add LICENSE, README, .travis.yml, .gitignore  Just copy these over from another project  Update the readme for the project Starting Off..
21. 21 Create Your Composer File
22. 22 Dependencies
23. 23 • Because we all do TDD right?  From a module; copy over the _autoload.php, Bootstrap.php, phpunit.xml.dist, TestConfiguration.php.dist, TestConfiguration.php.travis • You will need to customize  phpunit.xml.dist – Change out the unit test name.  TestConfiguration.php.dist – Configure your constants and configuration. Unit Testing
24. 24 • Tests should contain proper namespacing  ZendServiceTest\Twitter • Right now the Twitter component just uses ZendTest\Twitter J • Files you need should be located in an _files directory inside the test area of your component  tests/ZendService/Twitter/_files • Write unit tests like normal! Unit Testing
25. 25 • The guts of the library is what most of us are familiar with • Write your library inside of your compliant directory  library/ZendService/Twitter • Your first file should very well likely be that of the service name  library/ZendService/Twitter/Twitter.php • Ensure proper namespacing  ZendService\Twitter Library Code!
26. 26 • Remember to make use of the coding standards!  Docblocks • @category Zend • @package Zend_Service • @subpackage Twitter  Import the proper packages from their respective namespaces • No one likes to write out the full namespace time and time again…  Read the coding standards doc: • http://framework.zend.com/wiki/display/ZFDEV2/Coding+Standards • Mainly; PSR-0, PSR-1, PSR-2 (there are likely slight differences) Coding Standards
27. 27 • The most dreaded part of the job… • All of the documentation is in the “zf2-documentation” project under the “zendframework” github organization.  This will likely change for services in the future. • Fork the project • Create a feature branch: feature/twitter • Write your documentation • Submit a PR Documentation
28. 28 • Documentation is built out of reStructuredText  Yes, Docbook has gone away; so fear not! • Language Files  Always start with English first aka “en” as it is the default in the event a translation is missing. • Modify docs/language/en/index.rst to add in your new service  Follow the convention; for a service you will use zendservice.twitter.intro.rst • Create your file  docs/language/en/modules/zendservice.twitter.intro.rst or the like Documenting
29. 29 • Install the proper tools  apt-get install python-setuptools python-pygments  easy_install -U Sphinx • Enter the docs/ directory • Run: make html • Your documentation will now be in:  docs/_build/html  Review for errors before sending the PR Seeing your Documentation
30. Integrating your Service
31. 31 • Add the module to the composer configuration • Add in potential configuration • Setup the service manager • Fetch it inside of a controller We will leverage the Skeleton Application
32. 32 Composerize php composer.php install
33. 33 Potential Configuration
34. 34 Setup the Service Manager
35. 35 Controller Integration
36. 36 •  These slides will be posted to SlideShare & SpeakerDeck.   SpeakerDeck: http://speakerdeck.com/u/mwillbanks   Slideshare: http://www.slideshare.net/mwillbanks   Twitter: mwillbanks   G+: Mike Willbanks   IRC (freenode): mwillbanks   Blog: http://blog.digitalstruct.com   GitHub: https://github.com/mwillbanks Questions?