From 7fc50f10c33d29772d57d8c0af354eeb4eccf3ee Mon Sep 17 00:00:00 2001
From: "Brian S. O'Neill" <bronee@gmail.com>
Date: Mon, 15 Oct 2007 00:08:57 +0000
Subject: Minor lock fixes and optimizations.

---
 .../amazon/carbonado/spi/TransactionManager.java   | 43 ++++++++++++----------
 1 file changed, 24 insertions(+), 19 deletions(-)

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

diff --git a/src/main/java/com/amazon/carbonado/spi/TransactionManager.java b/src/main/java/com/amazon/carbonado/spi/TransactionManager.java
index e8cc637..355af7c 100644
--- a/src/main/java/com/amazon/carbonado/spi/TransactionManager.java
+++ b/src/main/java/com/amazon/carbonado/spi/TransactionManager.java
@@ -451,12 +451,18 @@ public abstract class TransactionManager<Txn> {
         }
 
         public void setDesiredLockTimeout(int timeout, TimeUnit unit) {
-            if (timeout < 0) {
-                mDesiredLockTimeout = 0;
-                mTimeoutUnit = null;
-            } else {
-                mDesiredLockTimeout = timeout;
-                mTimeoutUnit = unit;
+            TransactionManager<Txn> txnMgr = mTxnMgr;
+            txnMgr.mLock.lock();
+            try {
+                if (timeout < 0) {
+                    mDesiredLockTimeout = 0;
+                    mTimeoutUnit = null;
+                } else {
+                    mDesiredLockTimeout = timeout;
+                    mTimeoutUnit = unit;
+                }
+            } finally {
+                txnMgr.mLock.unlock();
             }
         }
 
@@ -464,6 +470,7 @@ public abstract class TransactionManager<Txn> {
             return mLevel;
         }
 
+        // Caller must hold mLock.
         <S extends Storable> void register(Cursor<S> cursor) {
             if (mCursorList == null) {
                 mCursorList = new CursorList<Object>();
@@ -471,30 +478,28 @@ public abstract class TransactionManager<Txn> {
             mCursorList.register(cursor, null);
         }
 
+        // Caller must hold mLock.
         <S extends Storable> void unregister(Cursor<S> cursor) {
             if (mCursorList != null) {
                 mCursorList.unregister(cursor);
             }
         }
 
+        // Caller must hold mLock.
         Txn getTxn() throws Exception {
-            TransactionManager<Txn> txnMgr = mTxnMgr;
-            txnMgr.mLock.lock();
-            try {
-                if (mTxn == null) {
-                    Txn parent = (mParent == null || mTop) ? null : mParent.getTxn();
-                    if (mTimeoutUnit == null) {
-                        mTxn = txnMgr.createTxn(parent, mLevel);
-                    } else {
-                        mTxn = txnMgr.createTxn(parent, mLevel, mDesiredLockTimeout, mTimeoutUnit);
-                    }
+            if (mTxn == null) {
+                TransactionManager<Txn> txnMgr = mTxnMgr;
+                Txn parent = (mParent == null || mTop) ? null : mParent.getTxn();
+                if (mTimeoutUnit == null) {
+                    mTxn = txnMgr.createTxn(parent, mLevel);
+                } else {
+                    mTxn = txnMgr.createTxn(parent, mLevel, mDesiredLockTimeout, mTimeoutUnit);
                 }
-                return mTxn;
-            } finally {
-                txnMgr.mLock.unlock();
             }
+            return mTxn;
         }
 
+        // Caller must hold mLock.
         private void closeCursors() throws PersistException {
             if (mCursorList != null) {
                 mCursorList.closeCursors();
-- 
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