SONARJAVA-4983 improve logging for partial analysis (#4932)

Author: johann-beleites-sonarsource

java-frontend/src/main/java/org/sonar/java/SonarComponents.java

@@ -341,6 +341,12 @@ private void registerCheckClasses(List<JavaCheck> destinationList, Checks<JavaCh
       .sorted(Comparator.comparing(check -> classIndexes.getOrDefault(check.getClass(), Integer.MAX_VALUE)))
       .toList();
     destinationList.addAll(orderedChecks);
+    if (LOG.isDebugEnabled()) {
+      LOG.debug("Registered check: [{}]",
+        orderedChecks.stream()
+          .map(c -> c.getClass().getSimpleName() + " (" + createdChecks.ruleKey(c) + ")")
+          .collect(Collectors.joining(", ")));
+    }
     jspChecks.addAll(orderedChecks.stream().filter(JspCodeVisitor.class::isInstance).toList());
   }
 

java-frontend/src/main/java/org/sonar/java/model/VisitorsBridge.java

@@ -181,12 +181,21 @@ public boolean scanWithoutParsing(InputFile inputFile) {
     if (sonarComponents != null && sonarComponents.fileCanBeSkipped(inputFile)) {
       PerformanceMeasure.Duration duration = PerformanceMeasure.start("ScanWithoutParsing");
       boolean allScansSucceeded = true;
+
+      List<JavaFileScanner> scannersRequiringParsing = new ArrayList<>();
+      List<JavaFileScanner> scannersNotRequiringParsing = new ArrayList<>();
+
       var fileScannerContext = createScannerContext(sonarComponents, inputFile, javaVersion, inAndroidContext, cacheContext);
       for (var scanner: scannersThatCannotBeSkipped) {
         boolean exceptionIsBlownUp = false;
         PerformanceMeasure.Duration scannerDuration = PerformanceMeasure.start(scanner);
         try {
-          allScansSucceeded &= scanner.scanWithoutParsing(fileScannerContext);
+          if (scanner.scanWithoutParsing(fileScannerContext)) {
+            scannersNotRequiringParsing.add(scanner);
+          } else {
+            scannersRequiringParsing.add(scanner);
+            allScansSucceeded = false;
+          }
         } catch (AnalysisException e) {
           // In the case where the IssuableSubscriptionVisitorsRunner throws an exception, the problem has already been
           // logged and the exception formatted.
@@ -210,6 +219,10 @@ public boolean scanWithoutParsing(InputFile inputFile) {
         }
       }
       duration.stop();
+
+      LOG.trace("Scanners that do not require parsing of {}: {}", inputFile, scannersNotRequiringParsing);
+      LOG.debug("Scanners that require parsing of {}: {}", inputFile, scannersRequiringParsing);
+
       return allScansSucceeded;
     } else {
       return false;

java-frontend/src/test/java/org/sonar/java/SonarComponentsTest.java

@@ -226,6 +226,33 @@ void test_sonar_components() {
     assertThat(sonarComponents.getJavaClasspath()).isEqualTo(list);
   }
 
+  @Test
+  void verify_registration_logging_doesnt_trigger_on_info_level() {
+    logTester.setLevel(Level.INFO);
+
+    JavaCheck expectedCheck = new CustomCheck();
+    CheckRegistrar expectedRegistrar = getRegistrar(expectedCheck);
+    SonarComponents sonarComponents = new SonarComponents(this.fileLinesContextFactory, null, null,
+      null, this.checkFactory, context.activeRules(), new CheckRegistrar[]{expectedRegistrar});
+    sonarComponents.setSensorContext(context);
+
+    assertThat(logTester.getLogs()).isEmpty();
+  }
+
+  @Test
+  void verify_registration_logging() {
+    logTester.setLevel(Level.DEBUG);
+
+    JavaCheck expectedCheck = new CustomCheck();
+    CheckRegistrar expectedRegistrar = getRegistrar(expectedCheck);
+    SonarComponents sonarComponents = new SonarComponents(this.fileLinesContextFactory, null, null,
+      null, this.checkFactory, context.activeRules(), new CheckRegistrar[]{expectedRegistrar});
+    sonarComponents.setSensorContext(context);
+
+    assertThat(logTester.getLogs()).hasSize(2);
+    assertThat(logTester.getLogs().get(0).getRawMsg()).isEqualTo("Registered check: [{}]");
+  }
+
   @Test
   void creation_of_custom_checks() {
     JavaCheck expectedCheck = new CustomCheck();