void putEntryOffset(long ledger, long entry, long offset) throws IOException {
int offsetInPage = (int) (entry % entriesPerPage);
// find the id of the first entry of the page that has the entry
// we are looking for
long pageEntry = entry - offsetInPage;
LedgerEntryPage lep = getLedgerEntryPage(ledger, pageEntry, false);
if (lep == null) {
lep = grabLedgerEntryPage(ledger, pageEntry);
}
assert lep != null;
lep.setOffset(offset, offsetInPage * LedgerEntryPage.getIndexEntrySize());
lep.releasePage();
}
long getPersistEntryBeyondInMem(long ledgerId, long lastEntryInMem) throws IOException {
FileInfo fi = null;
long lastEntry = lastEntryInMem;
try {
fi = getFileInfo(ledgerId, null);
long size = fi.size();
// make sure the file size is aligned with index entry size
// otherwise we may read incorret data
if (0 != size % LedgerEntryPage.getIndexEntrySize()) {
LOG.warn("Index file of ledger {} is not aligned with index entry size.", ledgerId);
size = size - size % LedgerEntryPage.getIndexEntrySize();
}
// we may not have the last entry in the cache
if (size > lastEntry * LedgerEntryPage.getIndexEntrySize()) {
ByteBuffer bb = ByteBuffer.allocate(pageSize);
long position = size - pageSize;
if (position < 0) {
position = 0;
}
fi.read(bb, position);
bb.flip();
long startingEntryId = position / LedgerEntryPage.getIndexEntrySize();
for (int i = entriesPerPage - 1; i >= 0; i--) {
if (bb.getLong(i * LedgerEntryPage.getIndexEntrySize()) != 0) {
if (lastEntry < startingEntryId + i) {
lastEntry = startingEntryId + i;
}
break;
}
}
}
} finally {
if (fi != null) {
fi.release();
}
}
return lastEntry;
}
long getEntryOffset(long ledger, long entry) throws IOException {
int offsetInPage = (int) (entry % entriesPerPage);
// find the id of the first entry of the page that has the entry
// we are looking for
long pageEntry = entry - offsetInPage;
LedgerEntryPage lep = getLedgerEntryPage(ledger, pageEntry, false);
try {
if (lep == null) {
lep = grabLedgerEntryPage(ledger, pageEntry);
}
return lep.getOffset(offsetInPage * LedgerEntryPage.getIndexEntrySize());
} finally {
if (lep != null) {
lep.releasePage();
}
}
}