From 2278740878264362fd0f51e5f782715a89e4964f Mon Sep 17 00:00:00 2001
From: "Brian S. O'Neill" <bronee@gmail.com>
Date: Tue, 19 Sep 2006 06:07:30 +0000
Subject: Removed all cursor synchronization. It just adds overhead and no real
(or needed) thread safety.
---
.../carbonado/repo/indexed/IndexedCursor.java | 178 ++++++++++-----------
.../com/amazon/carbonado/repo/jdbc/JDBCCursor.java | 8 +-
2 files changed, 90 insertions(+), 96 deletions(-)
(limited to 'src/main/java/com/amazon/carbonado/repo')
diff --git a/src/main/java/com/amazon/carbonado/repo/indexed/IndexedCursor.java b/src/main/java/com/amazon/carbonado/repo/indexed/IndexedCursor.java
index a6df5e0..075df1b 100644
--- a/src/main/java/com/amazon/carbonado/repo/indexed/IndexedCursor.java
+++ b/src/main/java/com/amazon/carbonado/repo/indexed/IndexedCursor.java
@@ -61,123 +61,117 @@ class IndexedCursor<S extends Storable> extends AbstractCursor<S> {
}
public boolean hasNext() throws FetchException {
- synchronized (mCursor) {
- if (mNext != null) {
- return true;
- }
- while (mCursor.hasNext()) {
- final Storable indexEntry = mCursor.next();
- S master = mGenerator.loadMaster(indexEntry);
- if (master == null) {
- LogFactory.getLog(getClass()).warn
- ("Master is missing for index entry: " + indexEntry);
- } else {
- if (mGenerator.isConsistent(indexEntry, master)) {
+ if (mNext != null) {
+ return true;
+ }
+ while (mCursor.hasNext()) {
+ final Storable indexEntry = mCursor.next();
+ S master = mGenerator.loadMaster(indexEntry);
+ if (master == null) {
+ LogFactory.getLog(getClass()).warn
+ ("Master is missing for index entry: " + indexEntry);
+ } else {
+ if (mGenerator.isConsistent(indexEntry, master)) {
+ mNext = master;
+ return true;
+ }
+
+ // This index entry is stale. Repair is needed.
+
+ // Insert a correct index entry, just to be sure.
+ try {
+ final IndexedRepository repo = mStorage.mRepository;
+ final Storage<?> indexEntryStorage =
+ repo.getIndexEntryStorageFor(mGenerator.getIndexEntryClass());
+ Storable newIndexEntry = indexEntryStorage.prepare();
+ mGenerator.setAllProperties(newIndexEntry, master);
+
+ if (newIndexEntry.tryLoad()) {
+ // Good, the correct index entry exists. We'll see
+ // the master record eventually, so skip.
+ } else {
+ // We have no choice but to return the master, at
+ // the risk of seeing it multiple times. This is
+ // better than seeing it never.
+ LogFactory.getLog(getClass()).warn
+ ("Inconsistent index entry: " + indexEntry);
mNext = master;
- return true;
}
- // This index entry is stale. Repair is needed.
-
- // Insert a correct index entry, just to be sure.
- try {
- final IndexedRepository repo = mStorage.mRepository;
- final Storage<?> indexEntryStorage =
- repo.getIndexEntryStorageFor(mGenerator.getIndexEntryClass());
- Storable newIndexEntry = indexEntryStorage.prepare();
- mGenerator.setAllProperties(newIndexEntry, master);
-
- if (newIndexEntry.tryLoad()) {
- // Good, the correct index entry exists. We'll see
- // the master record eventually, so skip.
- } else {
- // We have no choice but to return the master, at
- // the risk of seeing it multiple times. This is
- // better than seeing it never.
- LogFactory.getLog(getClass()).warn
- ("Inconsistent index entry: " + indexEntry);
- mNext = master;
- }
+ // Repair the stale index entry.
+ RepairExecutor.execute(new Runnable() {
+ public void run() {
+ Transaction txn = repo.enterTransaction();
+ try {
+ // Reload master and verify inconsistency.
+ S master = mGenerator.loadMaster(indexEntry);
+ if (mGenerator.isConsistent(indexEntry, master)) {
+ return;
+ }
- // Repair the stale index entry.
- RepairExecutor.execute(new Runnable() {
- public void run() {
- Transaction txn = repo.enterTransaction();
+ Storable newIndexEntry = indexEntryStorage.prepare();
+ mGenerator.setAllProperties(newIndexEntry, master);
+
+ newIndexEntry.tryInsert();
+
+ indexEntry.tryDelete();
+ txn.commit();
+ } catch (FetchException fe) {
+ LogFactory.getLog(IndexedCursor.class).warn
+ ("Unable to check if repair required for " +
+ "inconsistent index entry " +
+ indexEntry, fe);
+ } catch (PersistException pe) {
+ LogFactory.getLog(IndexedCursor.class).error
+ ("Unable to repair inconsistent index entry " +
+ indexEntry, pe);
+ } finally {
try {
- // Reload master and verify inconsistency.
- S master = mGenerator.loadMaster(indexEntry);
- if (mGenerator.isConsistent(indexEntry, master)) {
- return;
- }
-
- Storable newIndexEntry = indexEntryStorage.prepare();
- mGenerator.setAllProperties(newIndexEntry, master);
-
- newIndexEntry.tryInsert();
-
- indexEntry.tryDelete();
- txn.commit();
- } catch (FetchException fe) {
- LogFactory.getLog(IndexedCursor.class).warn
- ("Unable to check if repair required for " +
- "inconsistent index entry " +
- indexEntry, fe);
+ txn.exit();
} catch (PersistException pe) {
LogFactory.getLog(IndexedCursor.class).error
("Unable to repair inconsistent index entry " +
indexEntry, pe);
- } finally {
- try {
- txn.exit();
- } catch (PersistException pe) {
- LogFactory.getLog(IndexedCursor.class).error
- ("Unable to repair inconsistent index entry " +
- indexEntry, pe);
- }
}
}
- });
- } catch (RepositoryException re) {
- LogFactory.getLog(getClass()).error
- ("Unable to inspect inconsistent index entry " +
- indexEntry, re);
- }
+ }
+ });
+ } catch (RepositoryException re) {
+ LogFactory.getLog(getClass()).error
+ ("Unable to inspect inconsistent index entry " +
+ indexEntry, re);
+ }
- if (mNext != null) {
- return true;
- }
+ if (mNext != null) {
+ return true;
}
}
- return false;
}
+ return false;
}
public S next() throws FetchException {
- synchronized (mCursor) {
- if (hasNext()) {
- S next = mNext;
- mNext = null;
- return next;
- }
+ if (hasNext()) {
+ S next = mNext;
+ mNext = null;
+ return next;
}
throw new NoSuchElementException();
}
public int skipNext(int amount) throws FetchException {
- synchronized (mCursor) {
- if (mNext == null) {
- return mCursor.skipNext(amount);
- }
+ if (mNext == null) {
+ return mCursor.skipNext(amount);
+ }
- if (amount <= 0) {
- if (amount < 0) {
- throw new IllegalArgumentException("Cannot skip negative amount: " + amount);
- }
- return 0;
+ if (amount <= 0) {
+ if (amount < 0) {
+ throw new IllegalArgumentException("Cannot skip negative amount: " + amount);
}
-
- mNext = null;
- return 1 + mCursor.skipNext(amount - 1);
+ return 0;
}
+
+ mNext = null;
+ return 1 + mCursor.skipNext(amount - 1);
}
}
diff --git a/src/main/java/com/amazon/carbonado/repo/jdbc/JDBCCursor.java b/src/main/java/com/amazon/carbonado/repo/jdbc/JDBCCursor.java
index 7ef2510..f0a3752 100644
--- a/src/main/java/com/amazon/carbonado/repo/jdbc/JDBCCursor.java
+++ b/src/main/java/com/amazon/carbonado/repo/jdbc/JDBCCursor.java
@@ -52,7 +52,7 @@ class JDBCCursor<S extends Storable> extends AbstractCursor<S> {
mResultSet = statement.executeQuery();
}
- public synchronized void close() throws FetchException {
+ public void close() throws FetchException {
if (mResultSet != null) {
try {
mResultSet.close();
@@ -66,7 +66,7 @@ class JDBCCursor<S extends Storable> extends AbstractCursor<S> {
}
}
- public synchronized boolean hasNext() throws FetchException {
+ public boolean hasNext() throws FetchException {
ResultSet rs = mResultSet;
if (rs == null) {
return false;
@@ -84,7 +84,7 @@ class JDBCCursor<S extends Storable> extends AbstractCursor<S> {
return mHasNext;
}
- public synchronized S next() throws FetchException, NoSuchElementException {
+ public S next() throws FetchException, NoSuchElementException {
if (!hasNext()) {
throw new NoSuchElementException();
}
@@ -97,7 +97,7 @@ class JDBCCursor<S extends Storable> extends AbstractCursor<S> {
}
}
- public synchronized int skipNext(int amount) throws FetchException {
+ public int skipNext(int amount) throws FetchException {
if (amount <= 0) {
if (amount < 0) {
throw new IllegalArgumentException("Cannot skip negative amount: " + amount);
--
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