Use Light Service in max_open_projects code sample

max_opened_projects/README.md

@@ -4,18 +4,10 @@
 ## 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.
+Each method refers to the `ProjectCountingService` [light service][docs:plugin_services:light_services].
 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][file:ProjectCountingService] | n/a                   |
-
-*Reference: [Plugin Extension Points in IntelliJ SDK Docs][docs:ep]*
-
 ### Application Listeners
 
 | Name     | Implementation                                            | Listener Class           |
@@ -26,7 +18,7 @@ After opening each one, a message dialog is presented to the user with the curre
 
 [docs]: https://plugins.jetbrains.com/docs/intellij/
 [docs:plugin_services]: https://plugins.jetbrains.com/docs/intellij/plugin-services.html
-[docs:ep]: https://plugins.jetbrains.com/docs/intellij/plugin-extensions.html
+[docs:plugin_services:light_services]: https://plugins.jetbrains.com/docs/intellij/plugin-services.html#light-services
 [docs:listeners]: https://plugins.jetbrains.com/docs/intellij/plugin-listeners.html
 
 [file:ProjectCountingService]: ./src/main/java/org/intellij/sdk/maxOpenProjects/ProjectCountingService.java

max_opened_projects/src/main/java/org/intellij/sdk/maxOpenProjects/ProjectCountingService.java

@@ -1,45 +1,31 @@
-// Copyright 2000-2022 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2023 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license.
 
 package org.intellij.sdk.maxOpenProjects;
 
+import com.intellij.openapi.components.Service;
+
 /**
  * Application service implementation to keep a running count of how many projects are open at a given time.
  */
-public class ProjectCountingService {
+@Service
+public final class ProjectCountingService {
 
-  /**
+  private final static int MAX_OPEN_PROJECTS_LIMIT = 3;
-   * Sets the maximum allowed number of opened projects.
-   */
-  private final static int MAX_OPEN_PRJ_LIMIT = 3;
 
-  /**
-   * The count of open projects must always be >= 0.
-   */
   private int myOpenProjectCount = 0;
 
   public void incrProjectCount() {
-    validateProjectCount();
     myOpenProjectCount++;
   }
 
   public void decrProjectCount() {
+    if (myOpenProjectCount > 0) {
       myOpenProjectCount--;
-    validateProjectCount();
+    }
   }
 
   public boolean projectLimitExceeded() {
-    return myOpenProjectCount > MAX_OPEN_PRJ_LIMIT;
+    return myOpenProjectCount > MAX_OPEN_PROJECTS_LIMIT;
-  }
-
-  public int getProjectCount() {
-    return myOpenProjectCount;
-  }
-
-  /**
-   * Anti-bugging to ensure the count of open projects never goes below zero.
-   */
-  private void validateProjectCount() {
-    myOpenProjectCount = Math.max(myOpenProjectCount, 0);
   }
 
 }

max_opened_projects/src/main/resources/META-INF/plugin.xml

@@ -1,4 +1,4 @@
-<!-- Copyright 2000-2023 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
+<!-- Copyright 2000-2023 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license. -->
 <!-- Plugin Configuration File. Read more: https://plugins.jetbrains.com/docs/intellij/plugin-configuration-file.html -->
 
 <idea-plugin>
@@ -40,8 +40,4 @@
               topic="com.intellij.openapi.project.ProjectManagerListener"/>
   </applicationListeners>
 
-  <extensions defaultExtensionNs="com.intellij">
-    <applicationService serviceImplementation="org.intellij.sdk.maxOpenProjects.ProjectCountingService"/>
-  </extensions>
-
 </idea-plugin>