db4o Developer Community

In this session Patrick and Tetyana use db4obuild project from svn repository to create full db4o distribution (Java and .NET versions). They show how to access the repository, checkout the latest source, setup and run the build and check the results. The detailed instructions on the process are also available in db4o Reference documentation.

(Watch on-line without downloading here)

In this session Carl and Rodrigo use the JProbe profiler to analyse how reflection impacts the read and write performance of db4o for Java. They discover that the impact is very small and find a potential area to tune activation performance.

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In this 4-way session with Rodrigo, Carl, Patrick and Adriano, Rodrigo explains how fixture providers can be used to set up test cases with multiple dimensions of conditions in a way so they can all run against eachother.

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In this Paircast session Carl and Rodrigo review the very first drop of the sources of ObjectManager Enterprise for .NET.

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In this session Carl and Christoph only wanted to quickly fix some internal interfaces of the FreespaceManager.

While fixing the test case to actually test migration between FreespaceManagers they find a severe bug in FreeSpaceManager migration. In the process of this (very long) session they hunt down the issue and also recover space that was previously lost in migration.

This session demonstrates many debugging techniques and how DTrace can be helpful to focus on the place in the code where things go wrong.

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In this session Carl and Richard debug Jira issue COR-120 and fix Queries-By-Interface to return the right results.

The session gives some insight on:

• classes that are part of the querying architecture
• how to work with Debug.queries==true
• how to simplify debugging by storing only one object and expecting only one result or none

This session comes in two parts, one at 35 MB, the other with 42 MB.

Editorial work to extract the most interesting parts would be welcome.

(Watch on-line without downloading here)

Welcome to db4o Paircasts!

db4objects is a distributed company where developers from all continents (except Antarctica) work together. To take advantage of our shared knowledge we assign development tasks to a "pair", a team of two. The majority of our development work is done in remote pair programming sessions using Skype and VNC.

"Paircasts" are videos of recorded pairing sessions.

With Paircasts we would like to spread the knowledge about our code and about how we work in a fun and scalable way. We also would like to demonstrate how it is like to work in our team, so maybe we can attract even more talented developers to work with us.

Of course Paircasts also are an invitation to contribute suggestions on how we can improve. Please feel free to add comments to Paircast sessions or to start discussions about sessions in our development forums.

If our Paircast .avi files do not work in your preferred player because you do not have the right codecs, you may want to download and install the free K-Lite codec package from here or use VLC, a free player that comes with the necessary codecs.

Enjoy watching Paircasts!