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Intro To Spring Python
- 1. Introduction to SpringPython Greg L. Turnquist Senior Software Engineer SpringSource Adapted from presentation given at SpringOne 2008
- 2. What should youtake away from this? Spring Python gives you the tools to build dynamic, powerful, easy-to-maintain enterprise solutions
- 3. Who Am I?A test-bitten script junky, always seeking better solutions for customer requirements
- 4. Worked as asoftware engineer for 11 years at Harris Corporation after graduating Auburn University with Master's in Computer Engineering. Joined SpringSource in 2010.
- 5. Have built missioncritical systems, trained on-call support teams, evangelized usage of wikis, and utilized Agile practices to write top quality software
- 6. Active contributor toopen source community: MythTV, Mediawiki, Spring Framework/Acegi, TestNG Eclipse plug-in
- 7. Find me athttp://www.linkedin.com/in/GregLTurnquist
- 8. Who Am I?Wrote Spring Python 1.1
- 9. Find detailed diagrams,lots of code examples, and information on how to build powerful Python applications using the Spring way.
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- 11. The Spring Frameworkprovides many useful features, and I wanted those same features available in Python.
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- 19. Future of theproject
- 20. When/where did itcome from? In October 2006 came the carputer
- 21. Needed utility ofSpring with power of Python
- 22. In December 2006,made first release to Sourceforge
- 23. In July 2008,Russ Miles (SpringSource) invited Spring Python to be a Spring Extension
- 24. In June 2009,started writing Python 1.1 book
- 25. Becoming an extensionSince then: Migrated code to Spring's subversion servers, and later to git
- 26. Worked with buildteam to setup Continuous Integration
- 27. Copied all ticketsinto JIRA (open and closed)
- 28. Setup Spring Pythoncommunity forum, blog, and irc channel (#springpython)
- 29. Made 750+ commits;released versions 0.6-0.9, 1.0, and 1.1; closed 109 issues
- 30. Brought on boardtwo more committers
- 31. Currently interacting w/manydevs and users about future of Spring Python including roadmap for 1.2 and beyond
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- 39. Future of theproject
- 40. We have thesame concepts as Spring Simple Object Simple Object Dependency Injection AOP Portable Service Abstractions
- 41. Multiple IoC formatssupported Started with an XML-based configuration
- 42. Later, a pythondecorator-based configuration
- 43. Recently rewrote IoCcontainer, handles: Original format (now called PyContainerConfig)
- 44. Newer, more sophisticatedXML format (XMLConfig)
- 45. Spring Java's format(SpringJavaConfig)
- 46. Decorator-based @Object format(PythonConfig)
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- 48. New container canmix ANYTHING Allows multiple sources in multiple formats
- 49. Objects can referenceANY other object ...no matter WHERE its defined
- 50. ...and no matterWHAT format its defined in Flexible IoC container + dynamic Python = High Value
- 51. Pure Python IoC@Object-based configuration class MovieBasedConfig(PythonConfig): def __init__(self): super(MovieBasedConfig, self).__init__() @Object(scope.PROTOTYPE)
- 52. def MovieLister(self): lister= MovieLister()
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- 56. def MovieFinder(self): returnColonMovieFinder(filename="support/movies1.txt")
- 57. Compare with Spring'sIoC Similar concepts found in Spring Java = beans, Python = objects
- 58. @Object is like@Bean
- 59. Current scopes: SINGLETONand PROTOTYPE
- 60. FUTURE: Lazy initialization,auto-wiring Newer concepts not yet found in Spring One-and-only-one container type
- 61. FUTURE: Fluent API(DSL) configuration
- 62. Question What databaseproblem does Python have?
- 63. Answer The Magic8 says: “Same problem Java JDBC has!”
- 64. Python's database issueFor every query: Only difference between every query is SQL and row conversion // open connection to database
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- 66. // execute SQLquery
- 67. // for eachRowin resultSet // convert row into an object // close cursor
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- 69. Why create DatabaseTemplate?Spring's JdbcTemplate helped me write database queries fast in Java
- 70. Python apps havethe same problem and need the same leverage
- 71. DatabaseTemplate should bereason enough for potential users to embrace Spring Python
- 72. ORMs and DatabaseTemplateThey provide quick way to persist objects.
- 73. But sometimes theyare tricky for complex queries. What if... You need left outer joins that lack foreign key meta-data
- 74. You actually knowwhat a left outer join is and don't need “help”
- 75. You are portingfrom ORM to another
- 76. You have aDBA team that can optimize your queries
- 77. How to codea query Piece of PetClinic: Use binding variables (?) to avoid SQL injection attacks
- 78. Each row ofresults is passed to callback
- 79. Notice lack ofcursor management? return databaseTemplate.query(""" SELECT id, first_name, last_name, address, city, telephone
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- 81. WHERE upper(last_name) like?""",
- 82. ("%" + lastName.upper()+ "%",),
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- 84. Immediate payoff Benefits:No cursors to manage
- 85. No ugly try/exceptblocks
- 86. Focus is onbusiness logic
- 87. Query will workwith any RDBMS* MySQL, Sqlite, PostGreSQL, Oracle (*Okay, DB vendors can support different forms of binding variables, but we are ready for that!)
- 88. How to codea row mapper The other side: Very useful when you have to code a lot of Owner-based queries class OwnerMapper(RowMapper): def map_row(self, row): owner = Owner()
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- 96. Question Have youever had to deal with transactions?
- 97. Transactions power theenterprise Database calls are valuable for any app, small or large
- 98. Transactions power enterprisesolutions
- 99. Coding transactions isone of the first demands for enterprise apps
- 100. How to codetransactions Spring Python makes it easy to programmatically code transactions tx_mgr = ConnectionFactoryTransactionManager(factory)
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- 103. class txDefinition(TransactionCallback): defdo_in_transaction(s, status): dt.execute("INSERT INTO animal (name) VALUES (?)",('black mamba',))
- 104. dt.execute("INSERT INTO animal(name) VALUES (?)",('copperhead',))
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- 108. WHERE name like'c%'", required_type=types.StringType)
- 109. return results printtx_template.execute(txDefinition())
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- 111. Declarative transactions arekey TransactionTemplate is useful for a handful of transactions
- 112. However, marking businessmethods with @transactional catapults you into the enterprise
- 113. Decouples business logicfrom the database
- 114. How to declaretransactions class TransactionalBank(object):
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- 118. def deposit(self, amount,account_num):
- 119. self.dt.execute("UPDATE account SETbalance = balance + ?
- 120. WHERE account_num =?", (amount, account_num))
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- 122. def withdraw(self, amount,account_num):
- 123. self.dt.execute("UPDATE account SETbalance = balance - ?
- 124. WHERE account_num =?", (amount, account_num))
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- 127. def transfer(self, amount,from_account_num, to_account_num):
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- 130. Code is cleanand easy to read Declarative transactions move configuration to a central location
- 131. Your logic isclean, concise, and clear to its purpose
- 132. Enterprise apps tendto get HUGE, so maintainable code is paramount to success
- 133. Spring Python's declarativetransactions are EXACTLY what you need
- 134. Spring Python 1.1 shows you the pros and cons of programmatic vs. declarative vs. AOP-based transactions.
- 135. Question At whatstage do developers code security into their apps?
- 136. Answer HINT: Itsusually not the first thing on your mind
- 137. Security done rightis hard Security is a big flaw in modern web apps
- 138. Security is typicallydone last and thus, often rushed
- 139. Rushed implementation =WRONG solution
- 140. Spring Python's securityis the RIGHT solution
- 141. Authentication made easyAuthenticating a user is EASY
- 142. Uses AOP soyour APIs don't change
- 143. Familiar with SpringSecurity? We borrowed their concepts.
- 144. Makes Spring Pythonpowerful! TODAY: In-memory (for testing), database, LDAP
- 145. FUTURE: X.509, OpenID, OpenSSO, Basic HTTP, 2-factor, anything!
- 146. Authorization also easyAuthorizing users is also easy
- 147. Spring Python isjust as powerful
- 148. TODAY: Role-based and/orLabel-based voters
- 149. + Affirmative- orUnanimous- or Consensus-based policies
- 150. = Powerful,flexible, elegant configuration FUTURE: read-write-execute ACL voters for domain object security
- 151. Anything the communityneeds!
- 152. Question What technologymakes it easy to layer on services without changing APIs?
- 153. Answer Survey says:“ Aspect Oriented Programming”
- 154. Spring makes AOPeasy Spring AOP = easy AOP for Java
- 155. Spring Python AOP= easy AOP for Python
- 156. Allows enterprise-style servicesto be easily built around your objects Security, transactions, auditing, tracing, performance analysis Many parts of Spring Python ride on AOP
- 157. AOP is partof the Spring triangle Simple Object Simple Object Dependency Injection AOP Portable Service Abstractions
- 158. AOP, easy as1-2-3 class SampleService:
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- 160. return "You sentme '%s'" % data service = SampleService()
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- 162. >>> "You sentme 'something'" class WrappingSvc(MethodInterceptor):
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- 164. return "<Wrapped>" +invocation.proceed() + "</Wrapped>" service = ProxyFactoryObject(target = SampleService(), interceptors = [WrappingSvc()])
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- 166. >>> "<Wrapped>You sentme 'something'</Wrapped>"
- 167. Question What canyou do to make apps redundant and support more clients?
- 168. Answer The answerbehind door #3 is: “ Spread your app across multiple nodes”
- 169. Remoting links thingstogether Remoting is the building block for distributed systems
- 170. It allows youto split up apps that need more resources
- 171. Horizontal scaling allowsyou to grow your enterprise
- 172. Spring Python allowsyou to easily supply and consume remote services
- 173. Pyro today, REST& WS tomorrow Today: Pyro (Python remote objects) – pure python RPC library
- 174. Hessian – interoperableprotocol
- 175. JMS – linkPython-to-Python or Python-to-Java with WebshereMQ Tomorrow: RESTful web services
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- 178. Any web service,or other useful remoting protocol
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- 187. Future of theproject
- 188. Top quality, production-readyJust released 1.1.0.FINAL. Starting 1.2. Has ALL key features needed for development Top quality Tied in to CI: nightly builds and trunk commits
- 189. Built from Day1 using TDD => Code coverage at 85% Powerful integration CherryPy, Pyro, Hessian, MySQL, PostGreSQL, Sqlite, Oracle Documentation is up-to-date and useful
- 190. Community support isimportant Solutions What solutions do python users need?
- 191. What 3 rd party libraries can be enhanced or leveraged to provide integrated solutions? Community Striving to answer any/all questions posted to the forums
- 192. Provide fast supportto email distribution list
- 193. Grow the communityof users
- 194. Spring Python hasa strong future Quality is always #1 priority
- 195. Integrating with top-usedtools is important Django, Turbogears, Zope/Plone, Paste, Google App Engine, SpringSource Tool Suite, Jython, IronPython Books, podcasts, slide shows, video tutorials, anything to support the community
- 196. Spring + Python= powerful solutions Spring Python provides powerful, dynamic, and easy-to-maintain enterprise solutions
- 197. Useful project linksWeb site: http://springpython.webfactional.com
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- 200. Community forum: http://forum.springframework.org
- 201. Source code: https://src.springframework.org/svn/se-springpython-py/
- 202. Bug tracking: http://jira.springframework.org/browse/SESPRINGPYTHONPY
- 203. Mailing list: http://lists.springsource.com/listmanager/listinfo/springpython-users
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- 206. Thank you foryour attention