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The Subversive project is a proposed open source project under the Eclipse Technology Project.
This proposal is in the Project Proposal Phase (as defined in the Eclipse Development Process document) and is written to declare its intent and scope. This proposal is written to solicit additional participation and input from the Eclipse community. You are invited to comment on and/or join the project. Please send all feedback to the http://www.eclipse.org/newsportal/thread.php?group=eclipse.technology.subversive newsgroup.
The goal of project is to create an Subversion plug-in for Eclipse (Platform SVN Integration) with functionality similar to the Eclipse CVS Team project (Platform CVS Integration). After gathering wide community acceptance and reaching a sufficient maturity level, it is anticipated that Subversive will become part of the core Eclipse platform.
Team collaborative work, sharing source files and versioning are key concepts of any software development effort. One of the most popular version control system for quite some time is the open-source CVS project. Nonetheless, CVS concepts have become insufficient in recent years. The aim of the CVS successor known as Subversion (SVN) is to avoid CVS conceptual problems, provide more quality solution, which is targeted community needs and finally gather CVS user's community.
SVN's user community has been growing continually since the release of the first version. SVN is positioned as a replacement for CVS, and it is highly probable that it will be widely accepted by the community in that capacity. SVN has reached enough maturity level to be used in production, and many companies and development groups previously using CVS are replacing it with SVN now. This process of adoption is clearly reflected in open-source communities like apache.org and sourceforge.net, which now use SVN repositories along with CVS.
Wide SVN support by development tools is a key concept for SVN evolution and popularity growth. From the other side, including SVN support to development tools can be also valuable for these tools themselves. Unfortunately Eclipse doesn't provide such support in standard distribution, which is an object for discussion in community during a long time. Instead of using third-party plugins for SVN community want to see SVN support in standard Eclipse distribution.
The Subversive project was started in second quarter of 2005 as a component of larger development activity where it played role of foundation for a rich client to the Polarion server. Because of this the project scope was wider then standalone SVN client for Eclipse, especially in following areas:
One of the most important task since the beginning was to find the best way how the user interface components should interact with the SVN client access. This work brought to light necessity to define additional interfaces to standard JavaHL SVN client access interface. Major reasons for the extension were necessity to satisfy needs of higher layers, and to reach defined quality of UI behavior (e.g. progress reporting, ability to cancel an operation, etc.). Such extensions also allow to resolve problems, which were caused by limitations of standard JavaHL interfaces, like refactoring support. As a foundation for such improvements JavaSVN library was chosen. Together with JavaSVN authors Subversive team worked on implementation and verification of the SVN access interfaces improvements, which are further suggested for inclusion to standard SVN. As the result of such approach Subversive users can benefit from extended SVN functionality earlier then it can be included to standard SVN.
In March 2006, as soon as this project was reached enough maturity level, it was separated from larger project and released as the Subversive open source project on the Polarion Community site. Since the first public release a Subversive community grew to thousands of users, and hundreds of active community members. During a long time project ranked as one of the most popular in the Eclipse Plugin Central site.
The Subversive project main scope is providing an ability to work with SVN from the Eclipse. The main goal, which declared by this proposal is creation a foundation, which can be used for including the SVN support in the standard Eclipse distribution. In order to achieve this goal the following areas should be targeted.
The Subversive project is focused on development of an Eclipse plug-in which provides SVN support. From the project organization point of view it is close to Eclipse CVS project and follows its concepts and Eclipse best practices. Namely the project consists of Core and UI plugins and two SVN Client plugins: JavaSVN, which is pure Java implementation and JavaHL, which is native implementation. The project organization is represented in picture below.
Using extension points defined in Core and UI plugins Subversive can be easily integrated with other projects. Also it's possible to change used SVN Client library - contributors may implement their own SVN Client Library plug-ins and Subversive will use them automatically when they are installed in the Eclipse.
The Subversive project architecture, which is represented on the picture below, follows to several important requirements for both - UI and Core modules:
Subversive infrastructure contains following main benefits, which can be useful also for integration with other projects. More detailed information about the Subversive architecture is provided by the Subversive Architecture Overview document.
The Subversive team together with the JavaSVN authors extended standard SVN API (JavaHL) in order to extend SVN functionality and resolve problems, which are caused by limitations of standard JavaHL interface. Such extensions were made for concepts proofing as a first step to propose standard SVN extension. Currently Subversive users can benefit from following features, which are not available in other SVN tools:
Subversive reached the 1.0.0 release in July 2006 and now is developed in two streams: 1.1.x for Eclipse 3.2/Callisto and 1.0.x for Eclipse 3.0 and later. Project is available under EPL license.
The Project is proposed to be created within the Eclipse Technology Project. After reaching enough of a maturity level and a large enough user community, it is anticipated that will become part of the core Eclipse platform.
Polarion Software, as a submitter of this proposal, is looking for companies and persons interested in participating in all aspects of this project. If you are interested in actively participating, please take part in the newsgroup discussions or ask to be added to the list of interested parties.
Because Subversive's main functionality is providing access to SVN, it makes sense to store Subversive source code in a SVN repository and use Subversive for development.
Polarion Software has committed to providing project leadership and developer resources for this project. The initial committers are:
This proposal can be interested for the following Eclipse projects, which have integration with Subversive:
Since the first appearing on public in March 2006 the Subversive project quickly gathered around itself the thousands of people, which take an active interest in SVN. These people are participated in mail lists and forum discussions, send error reports and tips for improvements. This community of people defines a direction of project evolution and such community is one of the most important values of project.
Community people also helped a project by code contributions. Currently there are five code contributors and this number is growing.
A Subclipse project is another SVN plugin for Eclipse. After a publishing of the Subversive proposal for Eclipse, Subclipse team decided to publish their own proposal. After reviewing of this proposal we found that both or our proposals are close to each other and have same goals. The main goal for Subversive and Subclipse proposals is inclusion SVN support into standard Eclipse distribution. As so we invited the Subclipse team to join forces in creation of common project.
Both projects have a good history and a lot of supporters, so from all this community point of view cancelling of any project in favor of another is not a profitable way. Instead both teams should join forces in order to analyze strong and weak points of each solution and create new project, which benefit from the best solutions. It will not be a quick and easy way, but it's a good chance to union teams and community in order to reach the main goal.
In order to make it possible we propose following:
The Subversive team made fist steps in this direction and anyone can contribute to this process. See related discussions in the Subversive project http://www.eclipse.org/newsportal/thread.php?group=eclipse.technology.subversive newsgroup.
M1 - Q3 2006. Join the Eclipse community as a new Technology Project.
Aim - appearance in the community, gathering users and user support in order to reach a sound maturity level
M2 - September/October 2006.
Making current codebase compliant to EPL restrictions.
M3 - November 2006
M4 - January 2007
M5 - February/March 2007
M6 - Q2 2007. Be ready to join the Eclipse platform.
Aim - be ready to join the Eclipse platform standard distribution, preparation for code review, rework code according Eclipse comments, etc.
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