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Developers' Best Practices » History » Version 2

Claudio Atzori, 10/01/2014 10:10 AM

1 1 Alessia Bardi
h1. Developers' Best Practices
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It is time for D-NET development teams to find a strategy to improve our developement work!
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The introduction of Jenkins and Nexus helped a lot in terms of code management, but now it is time to establish a set of guidelines to better co-ordinate our teams.
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The following best practices are inspired by CNR developers' common sense, so we do not assume they are written in stones and applies as they are also in your cases.
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So, you are strongly invited to comment/update this wiki page, so that we can reach a consensus. 
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h2. Branching
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It is always recommended to create a new branch when performing heavy changes to a module, rather than directly into trunk.
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14 2 Claudio Atzori
h2. Use CI: trust Jenkins!
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The developer should clean the @.m2/repository/eu@ local repository from time to time to be sure that there are no modules installed locally. 
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Modules should be downloaded from Nexus in order to properly resolve dependencies.
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h2. Release Best Practices
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h3. When/Why releasing a module?
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* Generally speaking a developer should release a module when the code is mature enough to be used by others. 
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* An early release should be available in case others are relying on a module that is currently under heavy development (i.e., frequent commits that imply frequent snapshot updates), in order to avoid blocking other development activities.
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* Before updating an interface (e.g., service interfaces) or library (e.g., common and utilities modules) a developer MUST ENSURE there is a release of the current version. 
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h3. How to assign a release version number?
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Before releasing a module, you must check which kinds of changes have been performed since the last release.
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@svn log@ is your friend here :) .
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Depending on the kind of changes you can decide to increase the artifact version according to the following guidelines:
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* BIG CHANGES impact the MAJOR version number. Ex. @0.0.1 --> 1.0.0@
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** Examples of big changes are: updates to service interfaces, shared libraries, new functionalities.
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* MINOR CHANGES impact the MINOR version number. Ex. @1.2.5 --> 1.3.0@
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** Examples of minor changes are: service internals, non-shared code and libraries, important bug fixes.
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* BUG FIXES impact the BUILD version number. Ex. @1.4.2 --> 1.4.3@
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** Examples are small bug fixes that do not affect other components 
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h3. How to release?
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These are the steps for the release of a module, given that developer has a fresh checkout of the module to be released.
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# Ensure that the module to be released and the modules depending on it compile fine on Jenkins (http://ci.research-infrastructures.eu/).
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# Update and commit the version of the module (trunk) to be released according to the guidelines above. 
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This maven command can be helpful:
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 @mvn versions:set -DnewVersion={release_version}-SNAPSHOT@
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# Copy the trunk source code to a release branch:
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@svn cp https://svn.driver.../modules/<MODULE_NAME>/trunk https://svn.driver.../modules/<MODULE_NAME>/releases/{release_version}@
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# Switch to the release branch:
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@svn switch https://svn.driver.../modules/<MODULE_NAME>/releases/{release_version}@
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# A released module MUST depend and inherit ONLY from released modules. Therefore the pom.xml file MUST be updated as follows:
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## change the parent version to a released version. Current is 0.0.1-alpha.
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## change all snapshot dependencies to a released version. Ex. @0.2.3-SNAPSHOT --> 0.2.3@
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## change the artifact version by removing the @-SNAPSHOT@ suffix.
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# Commit the updated pom.xml.
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# Ensure the module compiles: @mvn clean compile package -U@
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# Create the release build job on Jenkins (http://ci.research-infrastructures.eu/):
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## Select "New job"
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## Type in the name of the job as 
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@[module name]-release-[version]@. Ex. @dnet-runtime-release-0.0.9@
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## Select "Create from existing job" and type in @dnet-svn-template-release@, then press OK
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## Modify the repository URL so that it matches the svn folder of the release branch
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## Save, enable the job, start the job, watch it compile, ensure it is deployed on nexus, disable the job again (an artifact on the dnet-release repository cannot be overwritten, hence we disable the job just to be sure they are not fired again by mistake).
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Possibly a script will be made available to cover the points from 2 to 7.