Introduction

The Akubra Project is a new effort to provide a pluggable file storage interface that can be adapted to almost any storage subsystem. Akubra supports both ordinary and transactional storage systems, but makes simplifying assumptions in order to achieve a high level of interoperability between storage systems:

In Akubra:

• a Blob is a finite-length bitstream with an id (a URI)
• a Blob Store is primarily concerned with providing read/write access to blobs.

News

• March 13th, 2010 - Akubra 0.3 released.  This release has no core API changes, but several important improvements:
  • The core Akubra jars are now available in Maven Central
  • All jars are now compiled for Java 6 (Java 5 has reached its End of Service Life)
  • All jars now include OSGi metadata
  • Logging is now done via SLF4J (was commons-logging)
  • The JTA dependency is now to version 1.1 (was previously 1.0.1B)
• November 27th, 2009 - Akubra 0.2 released.  This release:
  • Uses the latest version of Derby for the akubra-txn implementation
  • Repackages the Akubra classes under org.akubraproject
• April 30th, 2009 - Akubra 0.1 released.

Downloads

• Core API

  • [akubra-core-0.3.jar|http://repo1.maven.org/maven2/org/akubraproject/akubra-core/0.3/akubra-core-0.3.jar] \- The Core Akubra API \[[javadocs|http://fedora-commons.org/documentation/akubra/0.3/site/apidocs/org/akubraproject/package-summary.html]\]

• Base Implementations

  • [akubra-fs-0.3.jar|http://repo1.maven.org/maven2/org/akubraproject/akubra-fs/0.3/akubra-fs-0.3.jar] \- Simple filesystem implementation (non-transactional) \[[javadocs|http://fedora-commons.org/documentation/akubra/0.3/site/apidocs/org/akubraproject/fs/FSBlobStore.html]\]

  • [akubra-mem-0.3.jar|http://repo1.maven.org/maven2/org/akubraproject/akubra-mem/0.3/akubra-mem-0.3.jar] \- In-memory implementation (non-transactional) \[[javadocs|http://fedora-commons.org/documentation/akubra/0.3/site/apidocs/org/akubraproject/mem/MemBlobStore.html]\]

  • [akubra-www-0.3.jar|http://repo1.maven.org/maven2/org/akubraproject/akubra-www/0.3/akubra-www-0.3.jar] \- Web implementation (non-transactional, read-only) \[[javadocs|http://fedora-commons.org/documentation/akubra/0.3/site/apidocs/org/akubraproject/www/WWWStore.html]\]

• Layering Implementations

  • [akubra-map-0.3.jar|http://repo1.maven.org/maven2/org/akubraproject/akubra-map/0.3/akubra-map-0.3.jar]\- Wraps an existing BlobStore to provide a blob id mapping layer \[[javadocs|http://fedora-commons.org/documentation/akubra/0.3/site/apidocs/org/akubraproject/map/IdMappingBlobStore.html]\]

  • [akubra-mux-0.3.jar|http://repo1.maven.org/maven2/org/akubraproject/akubra-mux/0.3/akubra-mux-0.3.jar] \- Provides a unified view over any number of backing stores \[[javadocs|http://fedora-commons.org/documentation/akubra/0.3/site/apidocs/org/akubraproject/mux/AbstractMuxStore.html]\]

  • [akubra-qsc-0.3.jar|http://repo1.maven.org/maven2/org/akubraproject/akubra-qsc/0.3/akubra-qsc-0.3.jar] \- Provides quiescing capability to a BlobStore \[[javadocs|http://fedora-commons.org/documentation/akubra/0.3/site/apidocs/org/akubraproject/qsc/QuiescingBlobStore.html]\]

  • [akubra-rmi-0.3.jar|http://repo1.maven.org/maven2/org/akubraproject/akubra-rmi/0.3/akubra-rmi-0.3.jar] \- Allows a BlobStore to be exposed and accessed remotely, via RMI \[[javadocs|http://fedora-commons.org/documentation/akubra/0.3/site/apidocs/org/akubraproject/rmi/package-summary.html]\]

  • [akubra-txn-0.3.jar|http://repo1.maven.org/maven2/org/akubraproject/akubra-txn/0.3/akubra-txn-0.3.jar] \- Uses Derby to provide transactional capabilities over a non-transactional store \[[javadocs|http://fedora-commons.org/documentation/akubra/0.3/site/apidocs/org/akubraproject/txn/derby/package-summary.html]\]

• Utilities

  • [akubra-tck-0.3.jar|http://repo1.maven.org/maven2/org/akubraproject/akubra-tck/0.3/akubra-tck-0.3.jar] \- Technology Compatibility Kit for Akubra implementations \[[javadocs|http://fedora-commons.org/documentation/akubra/0.3/site/apidocs/org/akubraproject/tck/package-summary.html]\]

Documentation

• Requirements and Goals
• Analysis of Existing Approaches
• Latest API Documentation (Javadocs)
• Latest Maven Site

Community

We invite you browse our mailing lists, or subscribe and join the conversation:

• *Akubra Users* \[subscribe [via google|http://groups.google.com/group/akubra-users/subscribe] or [via email|mailto:akubra-users-subscribe@googlegroups.com] \| [view|http://groups.google.com/group/akubra-users/topics] \] \\ _General information, questions, release announcements, etc._

• *Akubra Developers* \[subscribe [via google|http://groups.google.com/group/akubra-dev/subscribe] or [via email|mailto:akubra-dev-subscribe@googlegroups.com] \| [view|http://groups.google.com/group/akubra-dev/topics] \| [original list archive|http://lists.topazproject.org/pipermail/akubra-dev/] \] \\ _Discussions pertaining the development of Akubra._

• *Akubra Codewatch* \[subscribe [via google|http://groups.google.com/group/akubra-codewatch/subscribe] or [via email|mailto:akubra-codewatch-subscribe@googlegroups.com] \| [view|http://groups.google.com/group/akubra-codewatch/topics] \] \\ _Intended for developers, this_ _{+}read-only{+}_ _list provides automatic notification of commits to the source code repository._

Source Code

You may download or browse the source code in our subversion repository at the following locations.

• Download: svn co https://svn.duraspace.org/akubra/trunk
• Browse: https://svn.duraspace.org/view/akubra/trunk

Note: You will need JDK 1.6+ and maven to build.

Coding conventions for this project are currently documented here (TODO:migrate here).

Issue Tracking

Bugs and features for this project will be tracked here.