public Future store(final long fileId, final long pageIndex, final OCachePointer dataPointer) {
Future future = null;
synchronized (syncObject) {
final GroupKey groupKey = new GroupKey(fileId, pageIndex >>> 4);
lockManager.acquireLock(Thread.currentThread(), groupKey, OLockManager.LOCK.EXCLUSIVE);
try {
WriteGroup writeGroup = writeGroups.get(groupKey);
if (writeGroup == null) {
writeGroup = new WriteGroup(System.currentTimeMillis());
writeGroups.put(groupKey, writeGroup);
}
int entryIndex = (int) (pageIndex & 15);
if (writeGroup.pages[entryIndex] == null) {
dataPointer.incrementReferrer();
writeGroup.pages[entryIndex] = dataPointer;
cacheSize.incrementAndGet();
} else {
if (!writeGroup.pages[entryIndex].equals(dataPointer)) {
writeGroup.pages[entryIndex].decrementReferrer();
dataPointer.incrementReferrer();
writeGroup.pages[entryIndex] = dataPointer;
}
}
writeGroup.recencyBit = true;
} finally {
lockManager.releaseLock(Thread.currentThread(), groupKey, OLockManager.LOCK.EXCLUSIVE);
}
if (cacheSize.get() > cacheMaxSize) {
future = commitExecutor.submit(new PeriodicFlushTask());
}
return future;
}
}
private int iterateBySubRing(
NavigableMap<GroupKey, WriteGroup> subMap,
int writeGroupsToFlush,
int flushedWriteGroups,
boolean forceFlush)
throws IOException {
Iterator<Map.Entry<GroupKey, WriteGroup>> entriesIterator = subMap.entrySet().iterator();
long currentTime = System.currentTimeMillis();
groupsLoop:
while (entriesIterator.hasNext() && flushedWriteGroups < writeGroupsToFlush) {
Map.Entry<GroupKey, WriteGroup> entry = entriesIterator.next();
final WriteGroup group = entry.getValue();
final GroupKey groupKey = entry.getKey();
final boolean weakLockMode = group.creationTime - currentTime < groupTTL && !forceFlush;
if (group.recencyBit && weakLockMode) {
group.recencyBit = false;
continue;
}
lockManager.acquireLock(
Thread.currentThread(), entry.getKey(), OLockManager.LOCK.EXCLUSIVE);
try {
if (group.recencyBit && weakLockMode) group.recencyBit = false;
else {
group.recencyBit = false;
int flushedPages = 0;
for (int i = 0; i < 16; i++) {
final OCachePointer pagePointer = group.pages[i];
if (pagePointer != null) {
if (!pagePointer.tryAcquireExclusiveLock()) continue groupsLoop;
try {
flushPage(
groupKey.fileId,
(groupKey.groupIndex << 4) + i,
pagePointer.getDataPointer());
flushedPages++;
final OLogSequenceNumber flushedLSN =
ODurablePage.getLogSequenceNumberFromPage(pagePointer.getDataPointer());
pagePointer.setLastFlushedLsn(flushedLSN);
} finally {
pagePointer.releaseExclusiveLock();
}
}
}
for (OCachePointer pagePointer : group.pages)
if (pagePointer != null) pagePointer.decrementReferrer();
entriesIterator.remove();
flushedWriteGroups++;
cacheSize.addAndGet(-flushedPages);
}
} finally {
lockManager.releaseLock(
Thread.currentThread(), entry.getKey(), OLockManager.LOCK.EXCLUSIVE);
}
lastGroupKey = groupKey;
}
return flushedWriteGroups;
}