Fix BatchRefUpdate progress-monitoring so it doesn't count twice

I was seeing output like this while running The BFG:

Updating references:    200% (374/187)

...issue sneaked in with 5cf53fda I think.

The update call is also moved to the end of the loop, as update() is
only supposed to be called after work has been done ("Denote that some
work units have been completed").

Change-Id: I1620fa75be16dc80df44745d0e123ea512762e31
Signed-off-by: Robin Stocker <robin@nibor.org>

org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/RefDirectoryTest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2010, Google Inc.
+ * Copyright (C) 2010, 2013 Google Inc.
  * and other copyright owners as documented in the project's IP log.
  *
  * This program and the accompanying materials are made available
@@ -73,6 +73,7 @@ import org.eclipse.jgit.junit.LocalDiskRepositoryTestCase;
 import org.eclipse.jgit.junit.TestRepository;
 import org.eclipse.jgit.lib.AnyObjectId;
 import org.eclipse.jgit.lib.BatchRefUpdate;
+import org.eclipse.jgit.lib.ProgressMonitor;
 import org.eclipse.jgit.lib.NullProgressMonitor;
 import org.eclipse.jgit.lib.Ref;
 import org.eclipse.jgit.lib.Ref.Storage;
@@ -1191,8 +1192,7 @@ public class RefDirectoryTest extends LocalDiskRepositoryTestCase {
 						ReceiveCommand.Type.UPDATE_NONFASTFORWARD));
 		BatchRefUpdate batchUpdate = refdir.newBatchUpdate();
 		batchUpdate.addCommand(commands);
-		batchUpdate
-				.execute(new RevWalk(diskRepo), NullProgressMonitor.INSTANCE);
+		batchUpdate.execute(new RevWalk(diskRepo), new StrictWorkMonitor());
 		Map<String, Ref> refs = refdir.getRefs(RefDatabase.ALL);
 		assertEquals(ReceiveCommand.Result.OK, commands.get(0).getResult());
 		assertEquals(ReceiveCommand.Result.REJECTED_NONFASTFORWARD, commands
@@ -1215,8 +1215,7 @@ public class RefDirectoryTest extends LocalDiskRepositoryTestCase {
 		BatchRefUpdate batchUpdate = refdir.newBatchUpdate();
 		batchUpdate.setAllowNonFastForwards(true);
 		batchUpdate.addCommand(commands);
-		batchUpdate
-				.execute(new RevWalk(diskRepo), NullProgressMonitor.INSTANCE);
+		batchUpdate.execute(new RevWalk(diskRepo), new StrictWorkMonitor());
 		Map<String, Ref> refs = refdir.getRefs(RefDatabase.ALL);
 		assertEquals(ReceiveCommand.Result.OK, commands.get(0).getResult());
 		assertEquals(ReceiveCommand.Result.OK, commands.get(1).getResult());
@@ -1267,8 +1266,7 @@ public class RefDirectoryTest extends LocalDiskRepositoryTestCase {
 		BatchRefUpdate batchUpdate = refdir.newBatchUpdate();
 		batchUpdate.setAllowNonFastForwards(true);
 		batchUpdate.addCommand(commands);
-		batchUpdate
-				.execute(new RevWalk(diskRepo), NullProgressMonitor.INSTANCE);
+		batchUpdate.execute(new RevWalk(diskRepo), new StrictWorkMonitor());
 		Map<String, Ref> refs = refdir.getRefs(RefDatabase.ALL);
 		assertEquals(ReceiveCommand.Result.OK, commands.get(0).getResult());
 		assertEquals(ReceiveCommand.Result.OK, commands.get(1).getResult());
@@ -1311,4 +1309,29 @@ public class RefDirectoryTest extends LocalDiskRepositoryTestCase {
 		File path = new File(diskRepo.getDirectory(), name);
 		assertTrue("deleted " + name, path.delete());
 	}
+
+	private static final class StrictWorkMonitor implements ProgressMonitor {
+		private int lastWork, totalWork;
+
+		public void start(int totalTasks) {
+			// empty
+		}
+
+		public void beginTask(String title, int totalWork) {
+			this.totalWork = totalWork;
+			lastWork = 0;
+		}
+
+		public void update(int completed) {
+			lastWork += completed;
+		}
+
+		public void endTask() {
+			assertEquals("Units of work recorded", totalWork, lastWork);
+		}
+
+		public boolean isCancelled() {
+			return false;
+		}
+	}
 }

org.eclipse.jgit/src/org/eclipse/jgit/lib/BatchRefUpdate.java

@@ -294,8 +294,6 @@ public class BatchRefUpdate {
 			// Now to the update that may require more room in the name space
 			for (ReceiveCommand cmd : commands2) {
 				try {
-					monitor.update(1);
-
 					if (cmd.getResult() == NOT_ATTEMPTED) {
 						cmd.updateType(walk);
 						RefUpdate ru = newUpdate(cmd);
@@ -305,7 +303,6 @@ public class BatchRefUpdate {
 							break;
 						case UPDATE:
 						case UPDATE_NONFASTFORWARD:
-							monitor.update(1);
 							RefUpdate ruu = newUpdate(cmd);
 							cmd.setResult(ruu.update(walk));
 							break;
@@ -329,6 +326,8 @@ public class BatchRefUpdate {
 				} catch (IOException err) {
 					cmd.setResult(REJECTED_OTHER_REASON, MessageFormat.format(
 							JGitText.get().lockError, err.getMessage()));
+				} finally {
+					monitor.update(1);
 				}
 			}
 		}