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A collection of useful utility classes and functions.

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common

Boss: Michael

A collection of useful utility classes and functions.

API Docs.

testkit - Unit test classes and utilities.

webapp - Spray- and web-specific tools.

guice - Guice-specific libraries.

core - Catchall collection of utilities, with smaller dependency footprint than webapp.

Using this project as a library

common is published to JCenter (an alternative to Maven Central) via BinTray at https://bintray.com/allenai/maven. If you have the latest version of our core plugins the BinTray resolver will be included by default. Otherwise you will need to include a resolver for the JCenter repo using the sbt-bintray plugin to find this artifact.

Releasing new versions

This project releases to BinTray. To make a release, follow our standard release process.

  1. Make sure you are on a branch of the main repository other than master. You cannot use a branch of your fork for releases. If you do, your tag will not make it to the main repository.
  2. Set the upstream repository (git push --set-upstream origin $branch_name).
  3. Kick of the release with sbt release.
  4. Create a pull request and make sure Semaphore builds it OK.
  5. When the pull request is merged, Semaphore will kick off a build and ultimately publish the artifact.
  6. You can verify that it was published by looking on BinTray.com!

You are done!

Guideline for Contributing to common

There is no strict process for contributing to common. However, following are some general guidelines.

Discuss in Pull Request Code Reviews

If you have implemented something in a repository other than common and that you think could be a candidate to be migrated into common, ask reviewers for feedback when issuing your pull request.

Create a GitHub Issue

Feel free create a GitHub issue in the common project to provide traceability and a forum for discussion.

Use TODO Comments

While working on a task, go ahead and implement the functionality that you think would be a good fit for common, and comment the implementation with a TODO suggesting it belongs in common. An example:

// TODO(mygithubusername): migrate to common
object ResourceHandling {
  type Resource = { def close(): Unit }
  def using[A](resource: => Resource)(f: Resource => A) {
    try {
      f(resource)
    finally {
      resource.close()
    }
  }
}

If you have created a GitHub issue for the common candidate, it is a good idea for traceability to reference the issue number in your TODO comment:

// TODO(mygithubusername): migrate to common. See https://github.com/allenai/common/issues/123
...

Have Two Code Reviewers to common Pull Requests

Try and always have at least two reviewers for a pull request to common

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