Open review DB in try-with-resource

Change-Id: I81357a357c9c2f589dab5801a435a475cf41da5b

src/main/java/com/googlesource/gerrit/plugins/reviewnotes/ExportReviewNotes.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/reviewnotes/ExportReviewNotes.java b/src/main/java/com/googlesource/gerrit/plugins/reviewnotes/ExportReviewNotes.java
index d4312f6..edf3f6c 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/reviewnotes/ExportReviewNotes.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/reviewnotes/ExportReviewNotes.java
@@ -76,17 +76,11 @@
   }
 
   private List<Change> allChanges() {
-    ReviewDb db = null;
-    try {
-      db = database.open();
+    try (ReviewDb db = database.open()){
       return db.changes().all().toList();
     } catch (OrmException e) {
       stderr.println("Cannot read changes from database " + e.getMessage());
       return Collections.emptyList();
-    } finally {
-      if (db != null) {
-        db.close();
-      }
     }
   }
 
@@ -157,14 +151,7 @@
   private class Worker extends Thread {
     @Override
     public void run() {
-      ReviewDb db;
-      try {
-        db = database.open();
-      } catch (OrmException e) {
-        stderr.println(e.getMessage());
-        return;
-      }
-      try {
+      try (ReviewDb db = database.open()){
         for (;;) {
           Entry<Project.NameKey, List<Change>> next = next();
           if (next != null) {
@@ -177,9 +164,10 @@
             break;
           }
         }
+      } catch (OrmException e) {
+        stderr.println(e.getMessage());
       } finally {
         monitor.endWorker();
-        db.close();
       }
     }
   }

src/main/java/com/googlesource/gerrit/plugins/reviewnotes/RefUpdateListener.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/reviewnotes/RefUpdateListener.java b/src/main/java/com/googlesource/gerrit/plugins/reviewnotes/RefUpdateListener.java
index c839c31..389195e 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/reviewnotes/RefUpdateListener.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/reviewnotes/RefUpdateListener.java
@@ -106,39 +106,21 @@
       return;
     }
 
-    ReviewDb reviewDb;
-    try {
 
-      try {
-        reviewDb = schema.open();
-      } catch (OrmException x) {
-        log.error(x.getMessage(), x);
-        return;
+    try (ReviewDb reviewDb = schema.open()){
+      CreateReviewNotes crn = reviewNotesFactory.create(
+          reviewDb, projectName, git);
+      if (e.getRefName().startsWith("refs/heads/")) {
+        crn.createNotes(e.getRefName(),
+            ObjectId.fromString(e.getOldObjectId()),
+            ObjectId.fromString(e.getNewObjectId()),
+            null);
+        crn.commitNotes();
       }
-
-      try {
-        CreateReviewNotes crn = reviewNotesFactory.create(
-            reviewDb, projectName, git);
-        if (e.getRefName().startsWith("refs/heads/")) {
-          crn.createNotes(e.getRefName(),
-              ObjectId.fromString(e.getOldObjectId()),
-              ObjectId.fromString(e.getNewObjectId()),
-              null);
-          crn.commitNotes();
-        }
-      } catch (OrmException x) {
-        log.error(x.getMessage(), x);
-      } catch (IOException x) {
-        log.error(x.getMessage(), x);
-      } catch (ConcurrentRefUpdateException x) {
-        log.error(x.getMessage(), x);
-      } finally {
-        reviewDb.close();
-      }
-
+    } catch (OrmException | IOException | ConcurrentRefUpdateException x) {
+      log.error(x.getMessage(), x);
     } finally {
       git.close();
     }
-
   }
 }