There are multiple projects that are mostly independent of each other. Here are a summary of each projects. Look for README in respective project subdirectory for more details.
this project scrapes wikipedia IRC channel for updated article, extracts newly added citations, and feed those URLs for crawling. scraper and crawl-scheduler are communicating through Kafka messaging, so other apps can also read a feed of new citations as well as original IRC notifications.
this project reads WordPress's official blog update stream, and schedules each permalink URL of new post for crawling. it is implemented as single application at this moment.