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Orbit/Adding Bundles to Orbit

Setting up CVS for the new bundle

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Creating a new project for an Orbit bundle

When adding an entirely new library to Orbit, you have to create a project in CVS to house the content. Follow these steps to set this up the first time.

  1. In your workspace, create a project with the desired name (see Bundle Naming). For this example we'll use com.example.foo.
  2. In the project, create a readme.txt file that alerts users to the fact that the real content of the project is maintained in CVS branches. Something like
    Work in this project happens in various branches according to the 
    
version of the library being maintained. For example, if you are looking for javax.servlet version 2.3, check out the v2_3 branch of the javax.servlet project.
  1. Share the project into the Orbit repository using the Team > Share Project... wizard. There select CVS then the "dev.eclipse.org/cvsroot/tools" repository. In the following page, choose Use specified module name and enter "org.eclipse.orbit/com.example.foo" (remember to fill-in your bundle name). Finish off the wizard steps.
  2. Immediately create a new branch of the newly created project following the steps in Creating a new branch.

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Creating a new branch of an existing Orbit project

Since all real content in Orbit is maintained in branches, HEAD never contains any real content (just the readme.txt file described above). Follow these steps to create a new branch.

  1. Check out HEAD of the desired project, or Replace with... HEAD if HEAD of the project is not currently in the workspace.
  2. Create a new branch using the Team > Branch... wizard. You will be asked to enter a branch name. The typical pattern for that is "v<version number>" where the version number is that which was assigned by the original library producers with the '.' (period) characters replaced with '_' (underscore) characters. So a library whose version is 2.3 would go in the v2_3 branch. Ensure that the "Work with this branch" option is selected and and finish off the wizard.
  3. Delete the readme.txt file
  4. Proceed to add the desired content and eventually commit the changes into the branch.

Moving an existing bundle to Orbit

Taking a library that is already bundled in another Eclipse project and adding it to Orbit is quite straightforward.

  1. Create a new project or new branch of an existing project to hold the bundle's content.
  2. Check out the existing version of the library into a project using a temporary name. You need to do this if the new and old projects have the same name. Use the Team > Check Out As... wizard from the repository navigator. Pick any name you like for the new project. For example, com.example.foo.old helps keep things clear. This project will only be in your workspace for a few minutes.
  3. Once the original project is checked out, copy and paste all content from the old project into the project you created at the beginning of these steps and delete the old project. Note that you should use the Resource Navigator to ensure you get all the content.
  4. Commit the changes to the destination project to create an exact copy of the original bundle project in a branch in the Orbit repository.

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Adding a library for the first time

Use this approach when you have a library (i.e., JAR) that you want to convert into a bundle.

  1. Create a new project or new branch of an existing project to hold the bundle's content.
  2. Start the New > Project > Plugin Development > Plug-in from existing JAR wizard to effectively import the library into a new project.
  3. Enter the new bundle name etc.
  4. Ensure that the Analyze library contents and add dependencies checkbox is selected.
  5. Ensure that the Unzip the JAR into the project checkbox is selected.
  6. Click Finish

Adding a library that is already a bundle

TBD

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Adding source for Orbit bundles

Adding the associated source for orbit bundles makes it easier to use and debug in situations where logic enters third party libraries. Orbit projects should if possible include the source code and add the related project bindings as follows.

  1. Create a zip file named src.zip at the root of the bundle project containing the java files and other resources useful for debugging.
  2. Select the project properties and link the src.zip source attachment to your classes on the "Java Build Path" -> "Libraries" tab.
  3. Open your project's build.properties and switch to the PDE Build tab.
  4. Select and check src.zip under Source Build and then save your changes.

Project setup

No matter how you created your bundle in Orbit, the following outlines how the project itself should be configured. Remember, it is often simpler to use the Resource Navigator rather than the Project Explorer since you really need to see all the files in your project and you aren't really compiling or building anything.

  • In general Orbit projects have the original JAR exploded into the root of the project. This results in a directory structure such as <project root>org/apache/commons/logging/foo.class.
  • Using the Project properties > Java Build Path > Source tab remove all source folders. Check the Libraries tab to ensure that that project itself is listed as a library (since the class files are directly in the root of the project)
  • In the MANIFEST.MF, ensure that the Bundle-Classpath: header is either missing or has only '.' as a value.
  • For most cases there is no need to have Eclipse-Autostart: true or such headers since this library is generic and will not have an OSGi bundle activator.
  • Similarly, for most bundles there is no need to set the singleton:=true on the Bundle-SymbolicName header.
  • Of course, you should set the Bundle-RequiredExecutionEnvironment header to the absolute minimum JRE required by the library. That can often be difficult to figure out. Look for some tools in PDE to help with this...
  • Where possible use Import-Package instead of Require-Bundle. This reduces sensitivity to different bundlings of the same library.
  • The Orbit community has agreed that Bundle-Version numbers should be the original library version number followed by .qualifier in the fourth segment. In the event that the original number is already four segments, that version number should be used and then followed by "_qualifier".

Special Detailed Notes on the four segment case

As documented above, in the event that the original package number is already four segments, that version number should be used and then followed by "_qualifier". These leads to a few differences in exactly how the final qualifier is computed and referred to in features and map files. The following example are taken from bug 152588.

For example, for the junit version 4.1.0.01, the manifest.mf file specifies

   Bundle-Version: 4.1.0.01_qualifier

But, the feature.xml file specifies

   <plugin
       id="org.junit"
       download-size="0"
       install-size="0"
       version="4.1.0.qualifier" />

And, the (multiversion) map file specifies

    plugin@org.junit,4.1.0=v200701261101,:pserver:anonymous....

The resulting zip file is named as follows (zip, in this case, since it is not a jarred bundle).

    org.junit_4.1.0.01_200704231307.zip

And, the resulting bundle version matches the file name, for example,

    Bundle-Version: 4.1.0.01_200704231307 

Note, the final qualifier in this case does not "match" the cvs version tag, as the usual case, but, is "translated" into current date/time to append to the provided 4th segment prefix.




Packaging licensing information

When packaging a third party library we have to ensure that the licensing information is present and correctly used.

  1. Create an about_files directory and add a copy of the licensing text.
  2. Create an about.html file at the root of the third party bundle based on the template here... (eventually).
  3. Open your project's build.properties and switch to the PDE Build tab.
  4. Select and check the about_files directory and about.html under both your Binary Build and Source Build and then save your changes.

Adding your bundle to the Orbit Build

See Orbit Builds for Orbit Committers.