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Maximum Open Projects Sample 
Reference: Plugin Services in IntelliJ SDK Docs
Quickstart
Maximum Open Projects Sample implements a ProjectManagerListener with two methods applied to check if the current projects have been opened or closed.
Each method refers to the ProjectCountingService service registered as an com.intellij.applicationService extension point.
It provides methods to increase and decrease the global counter of the currently opened projects in the IDE.
After opening each one, a message dialog is presented to the user with the current number.
Extension Points
| Name | Implementation | Extension Point Class |
|---|---|---|
com.intellij.applicationService |
ProjectCountingService | n/a |
Reference: Plugin Extension Points in IntelliJ SDK Docs
Application Listeners
| Name | Implementation | Listener Class |
|---|---|---|
| listener | ProjectOpenCloseListener | ProjectManagerListener |
Reference: Plugin Listeners in IntelliJ SDK Docs