Unzipped MaxOpenedProjects and added Gradle module

MaxOpenedProjects/MaxOpenedProjects.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module type="PLUGIN_MODULE" version="4">
+  <component name="DevKit.ModuleBuildProperties" url="file://$MODULE_DIR$/META-INF/plugin.xml" />
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/resources" type="java-resource" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

MaxOpenedProjects/src/META-INF/plugin.xml

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+<idea-plugin version="2">
+  <name>Plugin name here</name>
+  <description>short description of the plugin</description>
+  <version>1.0</version>
+  <vendor>YourCompany</vendor>
+  <idea-version since-build="8000"/>
+
+  <application-components>
+    <!-- Add your application components here -->
+  </application-components>
+
+  <project-components>
+    <!-- Add your project components here -->
+      <component>
+          <implementation-class>MyPackage.MaxProject</implementation-class>
+      </component>
+  </project-components>
+
+  <actions>
+    <!-- Add your actions here -->
+  </actions>
+
+  <extensions defaultExtensionNs="com.intellij">
+    <!-- Add your extensions here -->
+      <applicationService serviceInterface="MyPackage.MyCounter" serviceImplementation="MyPackage.MyCounter">
+          
+      </applicationService>
+  </extensions>
+</idea-plugin>

MaxOpenedProjects/src/MyPackage/MaxProject.java

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+package MyPackage;
+
+import com.intellij.openapi.components.ProjectComponent;
+import com.intellij.openapi.components.ServiceManager;
+import com.intellij.openapi.project.Project;
+import com.intellij.openapi.project.ProjectManager;
+import com.intellij.openapi.ui.Messages;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Created by IntelliJ IDEA.
+ * User: Alexey.Chursin
+ * Date: Aug 13, 2010
+ * Time: 3:50:25 PM
+ * To change this template use File | Settings | File Templates.
+ */
+public class MaxProject implements ProjectComponent {
+    public MaxProject(Project project) {
+    }
+
+    public void initComponent() {
+        // TODO: insert component initialization logic here
+    }
+
+    public void disposeComponent() {
+        // TODO: insert component disposal logic here
+    }
+
+    @NotNull
+    public String getComponentName() {
+        return "MaxProject";
+    }
+
+    public void projectOpened() {
+        // called when project is opened
+     MyCounter CommandCounter = ServiceManager.getService(MyCounter.class);
+
+     if (CommandCounter.IncreaseCounter() == -1) {
+         Messages.showMessageDialog("The maximum number of opened projects exceeds " + String.valueOf(CommandCounter.MaxCount) +
+         " projects!", "Error", Messages.getErrorIcon());
+         ProjectManager PM=ProjectManager.getInstance();
+         Project[] AllProjects = PM.getOpenProjects();
+         Project project = AllProjects[AllProjects.length-1];
+         PM.closeProject(project);
+     }
+     }
+
+
+    public void projectClosed() {
+        // called when project is being closed
+        MyCounter CommandCounter = ServiceManager.getService(MyCounter.class);
+        CommandCounter.DecreaseCounter();
+    }
+}

MaxOpenedProjects/src/MyPackage/MyCounter.java

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+package MyPackage;
+
+/**
+ * Created by IntelliJ IDEA.
+ * User: Alexey.Chursin
+ * Date: Aug 13, 2010
+ * Time: 3:49:33 PM
+ * To change this template use File | Settings | File Templates.
+ */
+public class MyCounter {
+    private int Count = 0;
+    // Sets the maximum allowed number of opened projects.
+    public final int MaxCount = 3;
+    public MyCounter(){
+
+
+    }
+
+    public int  IncreaseCounter() {
+        Count++;
+        return (Count > MaxCount) ? -1:Count;
+    }
+
+    public int  DecreaseCounter() {
+        Count--;
+        return (Count > MaxCount) ? -1:Count;
+    }
+
+}