Presentation: How to write unit tests

Attaching presentation I made for my colleagues regarding unit testing. Google docs version.

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NHibernate performance issues #3: slow inserts (stateless session)

The whole series of NHibernate performance issues isn't about simple use-cases. If you develop small app, such as simple website, you don't need to care about performance. But if you design and develop huge application and once you have decided to use NHibernate you'll solve various sort of issue. For today the use-case is obvious: how to insert many entities into the database as fast as possible? Why I'm taking about previous stuff? The are a lot of articles how the original NHibernate's purpose isn't to support batch operations , like inserts. Once you have decided to NHibernate, you have to solve this issue. Slow insertion The basic way how to insert mapped entity into database is: SessionFactory.GetCurrentSession().Save(object); But what happen when I try to insert many entities? Lets say, I want to persist 1000 libraries each library has 100 books = 100k of books each book has 5 rentals - there are 500k of rentals It's really slow! The inser

Git on Windows: MSysGit

I have started to use Git today. I read a lot of discussions that there is no good tool for Windows platform. After forethought I have decided to used TortoiseGit . I also feared of difficult work related with Git as a lot of articles mentioned many instructions. As I already said, I have decided to use TortoiseGit, because I'm used to work with TortoiseSvn, but for start, MSysGit is enought. So this article is about MSysGit , next will be about TortoiseGit . How to start with MSysgit on local machine? Download and install Git for Windows Create source code directory for your git app Right click the directory at your favorite file browser. Menu should contain item "Git init here". It initializes chosen directory to be git-abled :-) It was your first usage of Git. Commit data to local Git repository Now, you can add any file, your first source code, to created directory. If you are prepared to commit any changes to your local git repository, follow next instruc

Java, Docker, Spring boot ... and signals

I spend last couple weeks working on java apps running within docker containers deployed on clustered CoreOS machines . It's pretty simple to run java app within a docker container. You just have to choose a base image for your app and write a docker file. Note that docker registry contains many java distributions usually based on open jdk. We use our internal image for Oracle's Java 8 , build on top of something like this docker file . Once you make a decision whether oracle or openjdk, you can start to write your own docker file. FROM dockerfile/java:oracle-java8 ADD your.jar /opt/your-app ADD /dependencies /opt/your-app/dependency WORKDIR /opt/your-app CMD ["java -jar /opt/your-app/your.jar"] However, your app would probably require some parameters. Therefore, last line usually calls your shell script. Such script than validates number and format of those parameters among other things. This is also useful during the development phase because none of us

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