From 9fffba665e4a785cfeaddd038c8c8a302f216a1c Mon Sep 17 00:00:00 2001
From: "Brian S. O'Neill" <bronee@gmail.com>
Date: Tue, 17 May 2011 00:19:20 +0000
Subject: Don't rebuild index if nothing to build. Make sure bogus index
 entries are truncated.

---
 .../com/amazon/carbonado/repo/indexed/ManagedIndex.java  | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

(limited to 'src/main/java/com/amazon/carbonado/repo')

diff --git a/src/main/java/com/amazon/carbonado/repo/indexed/ManagedIndex.java b/src/main/java/com/amazon/carbonado/repo/indexed/ManagedIndex.java
index dbc7c06..1da57aa 100644
--- a/src/main/java/com/amazon/carbonado/repo/indexed/ManagedIndex.java
+++ b/src/main/java/com/amazon/carbonado/repo/indexed/ManagedIndex.java
@@ -294,6 +294,22 @@ class ManagedIndex<S extends Storable> implements IndexEntryAccessor<S> {
                 .orderBy(naturalOrdering(mMasterStorage.getStorableType()));
         }
 
+        // Quick check to see if any records exist in master.
+        {
+            Transaction txn = mRepository.enterTopTransaction(IsolationLevel.READ_COMMITTED);
+            try {
+                if (!masterQuery.exists()) {
+                    if (mIndexEntryStorage.query().exists()) {
+                        txn.exit();
+                        mIndexEntryStorage.truncate();
+                    }
+                    return;
+                }
+            } finally {
+                txn.exit();
+            }
+        }
+
         // Enter top transaction with isolation level of none to make sure
         // preload operation does not run in a long nested transaction.
         Transaction txn = mRepository.enterTopTransaction(IsolationLevel.NONE);
-- 
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