Scripting: do not start multiple request when related file was changed

idea/idea-gradle/src/org/jetbrains/kotlin/idea/scripting/gradle/GradleKotlinScriptConfigurationInputs.kt

@@ -11,13 +11,30 @@ import com.intellij.openapi.vfs.VirtualFile
 import org.jetbrains.kotlin.idea.core.script.configuration.cache.CachedConfigurationInputs
 import org.jetbrains.kotlin.psi.KtFile
 
+/**
+ * Up to date of gradle script depends on following factors:
+ * 1. It is out of date when essential [sections] are changed
+ * @see getGradleScriptInputsStamp
+ * 2. When some related file is changed (other gradle script, gradle.properties file)
+ * @see GradleScriptInputsWatcher.areRelatedFilesUpToDate
+ *
+ * [inputsTimeStamp] is needed to check if some related file was changed between updates
+ * [relatedFilesTimeStamp] is needed to check if we already loaded a configuration after the last related file change
+ *
+ * In case when [relatedFilesTimeStamp]s are equal there is no needs to check if related files were changed
+ */
 data class GradleKotlinScriptConfigurationInputs(
-    val buildScriptAndPluginsSections: String,
-    val timeStamp: Long
+    val sections: String,
+    val inputsTimeStamp: Long,
+    val relatedFilesTimeStamp: Long
 ) : CachedConfigurationInputs {
     override fun isUpToDate(project: Project, file: VirtualFile, ktFile: KtFile?): Boolean {
         val actualStamp = getGradleScriptInputsStamp(project, file, ktFile) ?: return false
-        return actualStamp.buildScriptAndPluginsSections == this.buildScriptAndPluginsSections
-                && project.service<GradleScriptInputsWatcher>().areAffectedFilesUpToDate(file, timeStamp)
+
+        if (actualStamp.sections != this.sections) return false
+
+        if (actualStamp.relatedFilesTimeStamp == this.relatedFilesTimeStamp) return true
+
+        return project.service<GradleScriptInputsWatcher>().areRelatedFilesUpToDate(file, inputsTimeStamp)
     }
 }

idea/idea-gradle/src/org/jetbrains/kotlin/idea/scripting/gradle/GradleScriptInputsWatcher.kt

@@ -35,6 +35,12 @@ class GradleScriptInputsWatcher(val project: Project) {
         }
     }
 
+    fun lastModifiedFileTimeStamp(file: VirtualFile): Long = lastModifiedRelatedFile(file)?.timeStamp ?: 0
+
+    fun areRelatedFilesUpToDate(file: VirtualFile, timeStamp: Long): Boolean {
+        return lastModifiedFileTimeStamp(file) <= timeStamp
+    }
+
     fun addToStorage(file: VirtualFile) {
         if (storage.contains(file)) {
             storage.remove(file)
@@ -42,19 +48,19 @@ class GradleScriptInputsWatcher(val project: Project) {
         storage.add(file)
     }
 
-    fun areAffectedFilesUpToDate(file: VirtualFile, timeStamp: Long): Boolean {
-        if (storage.isEmpty()) return true
+    private fun lastModifiedRelatedFile(file: VirtualFile): VirtualFile? {
+        if (storage.isEmpty()) return null
 
         val iterator = storage.descendingIterator()
-        if (!iterator.hasNext()) return true
+        if (!iterator.hasNext()) return null
 
         var lastModifiedFile = iterator.next()
         while (lastModifiedFile == file && iterator.hasNext()) {
             lastModifiedFile = iterator.next()
         }
 
-        if (lastModifiedFile == file) return true
+        if (lastModifiedFile == file) return null
 
-        return lastModifiedFile.timeStamp <= timeStamp
+        return lastModifiedFile
     }
 }

idea/idea-gradle/src/org/jetbrains/kotlin/idea/scripting/gradle/GradleScriptInputsWatcher.kt.as34

@@ -35,6 +35,12 @@ class GradleScriptInputsWatcher(val project: Project) {
         }
     }
 
+    fun lastModifiedFileTimeStamp(file: VirtualFile): Long = lastModifiedRelatedFile(file)?.timeStamp ?: 0
+
+    fun areRelatedFilesUpToDate(file: VirtualFile, timeStamp: Long): Boolean {
+        return lastModifiedFileTimeStamp(file) <= timeStamp
+    }
+
     fun addToStorage(file: VirtualFile) {
         if (storage.contains(file)) {
             storage.remove(file)
@@ -42,19 +48,19 @@ class GradleScriptInputsWatcher(val project: Project) {
         storage.add(file)
     }
 
-    fun areAffectedFilesUpToDate(file: VirtualFile, timeStamp: Long): Boolean {
-        if (storage.isEmpty()) return true
+    private fun lastModifiedRelatedFile(file: VirtualFile): VirtualFile? {
+        if (storage.isEmpty()) return null
 
         val iterator = storage.descendingIterator()
-        if (!iterator.hasNext()) return true
+        if (!iterator.hasNext()) return null
 
         var lastModifiedFile = iterator.next()
         while (lastModifiedFile == file && iterator.hasNext()) {
             lastModifiedFile = iterator.next()
         }
 
-        if (lastModifiedFile == file) return true
+        if (lastModifiedFile == file) return null
 
-        return lastModifiedFile.timeStamp <= timeStamp
+        return lastModifiedFile
     }
 }

idea/idea-gradle/src/org/jetbrains/kotlin/idea/scripting/gradle/utils.kt

@@ -5,6 +5,7 @@
 
 package org.jetbrains.kotlin.idea.scripting.gradle
 
+import com.intellij.openapi.components.service
 import com.intellij.openapi.project.Project
 import com.intellij.openapi.util.registry.Registry
 import com.intellij.openapi.vfs.VirtualFile
@@ -55,7 +56,8 @@ fun getGradleScriptInputsStamp(
                     }
                 }
 
-            GradleKotlinScriptConfigurationInputs(result.toString(), file.timeStamp)
+            val relatedFilesTimeStamp = project.service<GradleScriptInputsWatcher>().lastModifiedFileTimeStamp(file)
+            GradleKotlinScriptConfigurationInputs(result.toString(), file.timeStamp, relatedFilesTimeStamp)
         } else null
     }
 }

idea/idea-gradle/tests/org/jetbrains/kotlin/idea/scripting/gradle/GradleScriptInputsWatcherTest.kt

@@ -182,6 +182,15 @@ class GradleScriptInputsWatcherTest : AbstractScriptConfigurationLoadingTest() {
         assertConfigurationUpdateWasDone(testFiles.buildKts)
     }
 
+    fun testLoadedConfigurationWhenExternalFileChanged() {
+        assertAndLoadInitialConfiguration(testFiles.buildKts)
+
+        changePropertiesFile()
+
+        assertConfigurationUpdateWasDone(testFiles.buildKts)
+        assertConfigurationUpToDate(testFiles.buildKts)
+    }
+
     private fun assertConfigurationUpToDate(file: KtFile) {
         scriptConfigurationManager.updater.ensureUpToDatedConfigurationSuggested(file)
         assertNoBackgroundTasks()