Maven, SVN, Jars, Interfaces

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Maven, SVN, Jars, Interfaces
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Maven

• Why
• Dependency managment
• Build tool (classpath managment)
• Useful in large projects and in complex projects.

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Project Object model pom.xml

• (Copied from the lecture notes)
• ltprojectgt
• ltmodelVersiongt4.0.0lt/modelVersiongt
• ltgroupIdgtno.uio.inf5750lt/groupIdgt
• ltartifactIdgtexample1lt/artifactIdgt
• ltversiongt1.0-SNAPSHOTlt/versiongt
• ltpackaginggtjarlt/packaginggt
• ltnamegtINF5750 Example 1lt/namegt
• ltdependenciesgt
• ltdependencygt
• ltgroupIdgtcommons-logginglt/groupIdgt
• ltartifactIdgtcommons-logginglt/artifactIdgt
• ltversiongt1.0.3lt/versiongt
• lt/dependencygt
• ltdependencygt
• ltgroupIdgtspringframeworklt/groupIdgt
• ltartifactIdgtspringlt/artifactIdgt

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Groups and artifacts
no.uio.inf5750
assignment2
xml-formatter
assignment1
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Example uses of Maven

• (Copied from the lecture notes)
• Package the source code into an archive
• m2 package
• Run the projects unit tests
• m2 test
• Creating Eclipse project files
• m2 eclipseeclipse
• Creating IDEA project files
• m2 ideaidea
• Clean project
• m2 cleanclean
• Install the package into the local repository
• m2 install

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Maven repository

• Has nothing to do with an SVN repository.
• Central repo (maven.apache.org, ibiblio.org,
  download jars from here)
• Local repo (downloaded/installed jars)
• Look in /.m2/repository

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JAR

• A zip file for Java code
• Bundle lots of files together in a foo.jar file.
• May contain a manifest (like a ships manifest)
• Can be run, if a class is specified in the
  manifest java jar foo.jar
• The assignment1 example!
• Create archive
• jar cvzf foo.jar ltsome filesgt
• Extract contents of archive
• jar xvzf foo.jar

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Subversion (SVN)

• Why SVN?
• Multiple people coding on the same project.
• Version control Increment changes, rollback
  unwanted changes.
• CVS is the same type of program, only older.

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SVN Working cycle

• Create repository (svnadmin create)
• Check out local copy ( svn checkout URL)
• Create local files
• Add files to version control (svn add ltfilegt)
• Commit changes (svn commit)
• Check status of local copy (svn status)
• Check out/Update local copy (svn update)
• Change files
• Commit changes (svn commit)

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SVN Overview

• SVN client
• - Local copy
• svn CLI (linux/win)
• Tortoise SVN putty (win)
• Cygwin (svn through win)
• svn checkout
• svn add
• svn commit

• SVN server
• Central repo
• svnadmin create

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SVN General cycle
Client 1
Checkout
Commit
Central repo
Checkout
Client 2
Commit
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SVN Conflict!
Client 1
Checkout
Commit
Central repo
Checkout
Client 2
Commit
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SVN Healthy cycle
Client 1
Checkout
Commit
Central repo
Checkout
Update
Client 2
Commit
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SVN Adding to version control?

• What to check in
• Source code
• Tests
• Resources
• What not to check in
• Compiled code
• Eclipse files (.project, .whatnot)
• Other files specific for the local system
• Make SVN ignore files
• svn propset svnignore F ltfile-with-listgt -R
  ltPATHgt

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Java interfaces

• Perhaps the most advanced concept in Java?
• Code
• A class with only methods, methods which have
  no body.
• Concept
• A contract If you implement the interface, you
  must implement the methods defined by it.
• Reward Other classes can treat you as if you are
  an instance of the interface.
• Interface What. Implementation How.

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Interfaces Overview
Implementation 1
Application
Interface
Implementation 2
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Interfaces Java examples

• Javas ActionListener concept
• A class can listen to a button if it implements
  the ActionListener interface and the method
• public void actionPerformed(ActionEvent e)
• Javas collections framework (e.g. List, Set,
  etc)
• Interface List.
• Implementations ArrayList, Vector, LinkedList.

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Example RentABike
Implementations
MemoryRentABike (class)
BikeApplication (class)
RentABike (interface)
DatabaseRentABike (class)
FileRentABike (class)
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Where to choose the implementation?

• Hard code it into the application (highly
  coupled)
• Let a controlling class choose the implementation
  for the application. (Better, but still coupled)
• Decide at run time, depending on situation. Need
  a registry.
• Let Swing inject the implementation into the
  application (even better ?).

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Spring beans.xml

• ltbeansgt
• ltbean idrentABike
• classno.uio.inf5750.hanssto.bike.Mem
  oryRentABike/gt
• ltbean idBikeApplication
• classno.uio.inf5750.hanssto.bike.Bik
  eApplicationgt
• ltproperty namerentABikegt
• ltref idrentABike/gt
• lt/propertygt
• lt/beangt
• lt/beansgt