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Maximum Open Projects Sample 
Reference: Plugin Services in IntelliJ SDK Docs
Quickstart
Maximum Open Projects Sample implements a StartupActivity extension point to run on project open as well as a
ProjectManagerListener for tracking projects being closed.
Both use ProjectCountingService application-level light service.
It provides methods to increase and decrease the counter of currently opened projects in the IDE.
When opening more projects than the maximum allowed (3), a message dialog is shown.
Extension Points
| Name | Implementation | Extension Point Class |
|---|---|---|
com.intellij.postStartupActivity |
ProjectOpenStartupActivity | StartupActivity |
Application Listeners
| Name | Implementation | Listener Class |
|---|---|---|
| listener | ProjectOpenCloseListener | ProjectManagerListener |
Reference: Plugin Listeners in IntelliJ SDK Docs