statistics: report which JDK versions are used in project modules (FUS-533)

GitOrigin-RevId: 06a5c035e0e718b15c689d16102ffcd1fe3b0048

java/java-impl/src/META-INF/JavaPlugin.xml

@@ -432,6 +432,7 @@
     <projectService serviceImplementation="com.intellij.compiler.CompilerWorkspaceConfiguration"/>
     <statistics.projectUsagesCollector implementation="com.intellij.compiler.CompilerSettingsCollector"/>
     <statistics.projectUsagesCollector implementation="com.intellij.pom.java.JavaLanguageLevelCollector"/>
+    <statistics.projectUsagesCollector implementation="com.intellij.pom.java.JdkVersionCollector"/>
 
     <changesGroupingPolicy key="module" id="module"
                            implementationClass="com.intellij.openapi.vcs.changes.ui.ModuleChangesGroupingPolicy$Factory"/>

java/java-impl/src/com/intellij/pom/java/JdkVersionCollector.kt

@@ -0,0 +1,39 @@
+// Copyright 2000-2019 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+package com.intellij.pom.java
+
+import com.intellij.internal.statistic.beans.MetricEvent
+import com.intellij.internal.statistic.beans.newMetric
+import com.intellij.internal.statistic.eventLog.FeatureUsageData
+import com.intellij.internal.statistic.service.fus.collectors.ProjectUsagesCollector
+import com.intellij.openapi.module.ModuleManager
+import com.intellij.openapi.project.Project
+import com.intellij.openapi.roots.ModuleRootManager
+import com.intellij.util.lang.JavaVersion
+import java.util.*
+
+class JdkVersionCollector : ProjectUsagesCollector() {
+  override fun getGroupId(): String {
+    return "java.jdk.version"
+  }
+
+  public override fun getMetrics(project: Project): Set<MetricEvent> {
+    val sdks = ModuleManager.getInstance(project).modules.mapNotNullTo(HashSet()) {
+      ModuleRootManager.getInstance(it).sdk
+    }
+
+    val jdkVersions = sdks.mapTo(HashSet()) {
+      JavaVersion.tryParse(it.versionString)
+    }
+
+    return jdkVersions.mapTo(HashSet()) {
+      newMetric("MODULE_JDK_VERSION", FeatureUsageData().apply {
+        addData("feature", it?.feature ?: -1)
+        addData("minor", it?.minor ?: -1)
+        addData("update", it?.update ?: -1)
+        addData("ea", it?.ea ?: false)
+      })
+    }
+  }
+
+  override fun requiresReadAccess() = true
+}