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intellij-sdk-code-samples/code_samples/max_opened_projects/README.md
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2023.2 release (#1091)
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Maximum Open Projects Sample JetBrains IntelliJ Platform SDK Docs

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