bubble indexParallel exceptions up to the indexer main

also get rid of the capability to perform per directory reindex

fixes #4696

Author: vladak

opengrok-indexer/src/main/java/org/opengrok/indexer/Metrics.java

@@ -35,12 +35,12 @@
 import io.micrometer.statsd.StatsdConfig;
 import io.micrometer.statsd.StatsdMeterRegistry;
 import io.micrometer.statsd.StatsdFlavor;
+import org.opengrok.indexer.configuration.Project;
 import org.opengrok.indexer.configuration.RuntimeEnvironment;
-import org.opengrok.indexer.index.Indexer;
 import org.opengrok.indexer.logger.LoggerFactory;
 
 import java.util.Collections;
-import java.util.List;
+import java.util.Set;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 import java.util.stream.Collectors;
@@ -108,13 +108,12 @@ public boolean buffered() {
     private Metrics() {
     }
 
-    public static void updateSubFiles(List<String> subFiles) {
+    public static void updateProjects(Set<Project> projects) {
         // Add tag for per-project reindex.
-        if (statsdRegistry != null && !subFiles.isEmpty()) {
-            String projects = subFiles.stream().
-                    map(s -> s.startsWith(Indexer.PATH_SEPARATOR_STRING) ? s.substring(1) : s).
+        if (statsdRegistry != null && !projects.isEmpty()) {
+            String projectNames = projects.stream().map(Project::getName).
                     collect(Collectors.joining(","));
-            Tag commonTag = Tag.of("projects", projects);
+            Tag commonTag = Tag.of("projects", projectNames);
             LOGGER.log(Level.FINE, "updating statsdRegistry with common tag: {}", commonTag);
             statsdRegistry.config().commonTags(Collections.singleton(commonTag));
         }

opengrok-indexer/src/main/java/org/opengrok/indexer/configuration/RuntimeEnvironment.java

@@ -143,12 +143,6 @@ public final class RuntimeEnvironment {
 
     private final Set<ConfigurationChangedListener> listeners = new CopyOnWriteArraySet<>();
 
-    public List<String> getSubFiles() {
-        return subFiles;
-    }
-
-    private final List<String> subFiles = new ArrayList<>();
-
     /**
      * Maps project name to FileCollector object. This is used to pass the list of files acquired when
      * generating history cache in the first phase of indexing to the second phase of indexing.
@@ -507,17 +501,15 @@ public String getPathRelativeToSourceRoot(File file) throws IOException, Forbidd
             return maybeRelPath;
         }
 
-        throw new FileNotFoundException("Failed to resolve [" + file.getPath()
-                + "] relative to source root [" + sourceRoot + "]");
+        throw new FileNotFoundException(String.format("Failed to resolve '%s' relative to source root '%s'",
+                file.getPath(), sourceRoot));
     }
 
     /**
-     * Do we have any projects ?
-     *
-     * @return true if we have projects
+     * @return true if projects are enabled and there are some projects present
      */
     public boolean hasProjects() {
-        return (this.isProjectsEnabled() && getProjects().size() > 0);
+        return (this.isProjectsEnabled() && !getProjects().isEmpty());
     }
 
     /**