HornetQ

If you need information about the HornetQ project please go to

http://community.jboss.org/wiki/HornetQ

http://www.jboss.org/hornetq/

This file describes some minimum 'stuff one needs to know' to get started coding in this project.

Source

The project's source code is hosted at:

https://github.com/hornetq

Git usage:

Pull requests should be merged without fast forwards '--no-ff'. An easy way to achieve that is to use

% git config branch.master.mergeoptions --no-ff

Maven

The minimum required Maven version is 3.0.0.

Do note that there are some compatibility issues with Maven 3.X still unsolved 1. This is specially true for the 'site' plugin 2.

Tests

To run the unit tests:

% mvn -Phudson-tests test

Generating reports from unit tests:

% mvn install site

Running tests individually

% mvn -Phudson-tests -DfailIfNoTests=false -Dtest=<test-name> test

where <test-name> is the name of the Test class without its package name

Examples

To run an example firstly make sure you have run

% mvn -Prelease install

If the project version has already been released then this is unnecessary.

then you will need to set the following maven options, on Linux by

export MAVEN_OPTS="-Xmx1024m -XX:MaxPermSize=512m"

and the finally run the examples by

% mvn verify

You can also run individual examples by running the same command from the directory of which ever example you want to run. NB for this make sure you have installed examples/common.

Recreating the examples

If you are trying to copy the examples somewhere else and modifying them. Consider asking Maven to explicitly list all the dependencies:

# if trying to modify the 'topic' example:
cd examples/jms/topic && mvn dependency:list

To build a release artifact

% mvn -Prelease install

To build the release bundle

% mvn -Prelease package

Eclipse

We recommend using Eclipse Kepler (4.3), due to the built-in support for Maven and Git. Note that there are still some Maven plugins used by sub-projects (e.g. documentation) which are not supported even in Eclipse Kepler (4.3).

Eclipse m2e is already included in "Eclipse IDE for Java Developers", or it can be installed from Eclipse Kepler release repository.

Annotation Pre-Processing

HornetQ uses JBoss Logging and that requires source code generation from Java annotations. In order for it to 'just work' in Eclipse you need to install the Maven Integration for Eclipse JDT Annotation Processor Toolkit m2e-apt. See this JBoss blog post for details.

M2E Connector for Javacc-Maven-Plugin

Eclipse Indigo (3.7) has out-of-the-box support for it.

As of this writing, Eclipse Kepler (4.3) still lacks support for Maven's javacc plugin. The available m2e connector for javacc-maven-plugin requires a downgrade of Maven components to be installed. manual installation instructions (as of this writing you need to use the development update site). See this post for how to do this with Eclipse Juno (4.2).

The current recommended solution for Eclipse Kepler is to mark javacc-maven-plugin as ignored by Eclipse, run Maven from the command line and then modify the project hornetq-core-client adding the folder target/generated-sources/javacc to its build path.

Use Project Working Sets

Importing all HornetQ subprojects will create too many projects in Eclipse, cluttering your Package Explorer and Project Explorer views. One way to address that is to use Eclipse's Working Sets feature. A good introduction to it can be found at a Dzone article on Eclipse Working Sets.

Code Formatting

Eclipse code formatting and (basic) project configuration files can be found at the etc/ folder. You should manually copy them after importing all your projects:

for settings_dir in `find . -type d -name .settings`; do
   \cp -v etc/org.eclipse.jdt.* $settings_dir
done

Do not use the maven-eclipse-plugin to copy the files as it conflicts with m2e.

Committing Changes

Repositories

The code repository for ActiveMQ6 is hosted by Apache org and lives here: https://git-wip-us.apache.org/repos/asf/activemq-6.git. We also host a mirror of the ActiveMQ repository on GitHub: https://github.com/apache/activemq-6. We use this mirror for all code submissions and reviews. To submit code to ActiveMQ please open a Pull Request as outlined as part of the GitHub workflow described here: https://guides.github.com/introduction/flow/index.html. Once a pull request is opened it will be reviewed and commented on. Any further changes as a result of comments / review process should be addressed and reflected in the original pull request as outlined in the GitHub workflow. When the pull request has went through the review process and ready to merge, the reviewer should comment with "Ack, Ready to Push". Once an Ack message is received one of the ActiveMQ core team members will push the changes to upstream Apache ActiveMQ repository and close the pull request.

Commit Messages

We follow the 50/72 git commit message format. An ActiveMQ6 commit message should be formatted in the following manner:

• Add the ACTIVEMQ6 JIRA or Bugzilla reference (if one exists) followed by a brief description of the change in the first line.
• Insert a single blank line after the first line.
• Provide a detailed description of the change in the following lines, breaking paragraphs where needed.
• The first line should be limited to 50 characters
• Subsequent lines should be wrapped at 72 characters.

An example correctly formatted commit message:

ACTIVEMQ6-123 Add new commit msg format to README

Adds a description of the new commit message format as well as examples
of well formatted commit messages to the README.md.  This is required 
to enable developers to quickly identify what the commit is intended to 
do and why the commit was added.

Core Contributers

Core ActiveMQ members have write access to the Apache ActiveMQ repositories and will be responsible for Ack'ing and pushing commits contributed via pull requests on GitHub. The follow steps can be used as an example for how to set up relevant ActiveMQ repositories for reviewing and pushing changes.

To setup repositories for reviewing and pushing:

  # Clone the GitHub Mirror of ActiveMQ Repo:
  git clone git@github.com:apache/activemq-6.git

  # Add the following section to your <activemq-6 repo>/.git/config statement to fetch all pull requests sent to the GitHub mirror.  Note that the remote name for git@github.com:apache/activemq-6.git may be different.  Be sure to edit all references to the remote name.  In this case "activemq".
  [remote "activemq"]
        url = git@github.com:apache/activemq-6.git
        fetch = +refs/heads/*:refs/remotes/activemq/*
        fetch = +refs/pull/*/head:refs/remotes/activemq/pr/*


  # Add the Apache repository as a remote
  git remote add apache https://git-wip-us.apache.org/repos/asf/activemq-6.git

  # Fetch
  git fetch --all

To push commits from a pull request to the apache repository:

  cd <activemq repo>

  # Download all the remote branches etc... including all the pull requests.
  git fetch --all
  
  # Checkout the pull request you wish to review
  git checkout pr/2

  # Ensure this patch is rebased onto apache/master
  git rebase apache/master

  # Continue through review process.  Once an Ack has been sent.  Push to the Apache ActiveMQ6 repo
  git push apache pr/2:master