Comala Publishing provides a Java API for other add-ons to extend.
Setup
Add the Comalatech Maven repository to you .m2/settings.xml file or your project pom.xml.
<repository>
<id>appfire-comalatech-public</id>
<url>https://nexus.appfire.com/repository/comalatech-maven-public/</url>
<snapshots>
<enabled>true</enabled>
</snapshots>
<releases>
<enabled>true</enabled>
</releases>
</repository>
Add a dependency on the publishing api library to your project
Only available from Comala Publishing 2.16.0 onwards, there will always be a corresponding API library with the same version available.
<dependency>
<groupId>com.comalatech</groupId>
<artifactId>publishing-api</artifactId>
<version>3.1.0</version>
<scope>provided</scope>
</dependency>
Using the API
Currently the API provides a range of events that can be listened to via Confluence event listeners. This allows your add-on to take some additional action once a publishing action has taken place.