ZooKeeper is a high-performance coordination service for distributed applications. It exposes common services - such as naming, configuration management, synchronization, and group services - in a simple interface so you don’t have to write them from scratch.

Lombok is a Java library which provides a set of annotations with which you can simplify your Java code(get rid of “getter/setter/equals/hashcode” and etc) by using the annotations, after that Lombok will generate the boilerplate code for you during the compiling/building time(“compile” for “Eclipse/IntelliJ IDEA with plugins”, “build” for “Maven/Gradle”) with the annotation information. Then you can use the Java classes as vanilla Java classes.

From here, here, here and here.

It’s difficult to figure out how a Gradle script works as a pure Groovy script. Such as, where are the “buildscript/task/project/allprojects/subprojects/dependencies” functions defined, if they are function calls really?

Recently, I’m working on a project in which I use Grails to implement RESTful API back-end with the “rest-api” profile. It’s simple and works well, until the frond-end developer asks me to intergrate the front-end implementation(React with “javscript/css/font/image”) files into the back-end Grails project.

When installing a new Python version with pyenv, you may need to migrate all the installed packages from a previous Python version to the new one. For an example, I had Python 3.5.2 and installed a lot of packages with pip. After I install Python 3.6.0, I want to make the new Python have all the packages under the Python 3.5.2 version.

ReText is a simple but powerful editor for Markdown and reStructuredText markup languages written in Python.

After the Kernel is updated, the old unused kernels in Ubuntu are not removed by default. To clean them, you can do the following actions.

In the recent several days I was working on a Grails web application which provides a REST API implementation.