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/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
package org.apache.bookkeeper.bookie;
import io.netty.buffer.ByteBuf;
import java.io.IOException;
import java.util.Collections;
import java.util.Iterator;
import java.util.NoSuchElementException;
import java.util.PrimitiveIterator.OfLong;
import org.apache.bookkeeper.common.util.Watcher;
import org.apache.bookkeeper.conf.ServerConfiguration;
import org.apache.bookkeeper.stats.NullStatsLogger;
import org.apache.bookkeeper.stats.StatsLogger;
import org.apache.bookkeeper.util.SnapshotMap;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Implementation of LedgerCache interface.
* This class serves two purposes.
*/
public class LedgerCacheImpl implements LedgerCache {
private static final Logger LOG = LoggerFactory.getLogger(LedgerCacheImpl.class);
private final IndexInMemPageMgr indexPageManager;
private final IndexPersistenceMgr indexPersistenceManager;
private final int pageSize;
private final int entriesPerPage;
public LedgerCacheImpl(ServerConfiguration conf, SnapshotMap activeLedgers,
LedgerDirsManager ledgerDirsManager) throws IOException {
this(conf, activeLedgers, ledgerDirsManager, NullStatsLogger.INSTANCE);
}
public LedgerCacheImpl(ServerConfiguration conf, SnapshotMap activeLedgers,
LedgerDirsManager ledgerDirsManager, StatsLogger statsLogger) throws IOException {
this.pageSize = conf.getPageSize();
this.entriesPerPage = pageSize / 8;
this.indexPersistenceManager = new IndexPersistenceMgr(pageSize, entriesPerPage, conf, activeLedgers,
ledgerDirsManager, statsLogger);
this.indexPageManager = new IndexInMemPageMgr(pageSize, entriesPerPage, conf,
indexPersistenceManager, statsLogger);
}
IndexPersistenceMgr getIndexPersistenceManager() {
return indexPersistenceManager;
}
IndexInMemPageMgr getIndexPageManager() {
return indexPageManager;
}
/**
* @return page size used in ledger cache
*/
public int getPageSize() {
return pageSize;
}
@Override
public Long getLastAddConfirmed(long ledgerId) throws IOException {
return indexPersistenceManager.getLastAddConfirmed(ledgerId);
}
@Override
public long updateLastAddConfirmed(long ledgerId, long lac) throws IOException {
return indexPersistenceManager.updateLastAddConfirmed(ledgerId, lac);
}
@Override
public boolean waitForLastAddConfirmedUpdate(long ledgerId,
long previousLAC,
Watcher watcher)
throws IOException {
return indexPersistenceManager.waitForLastAddConfirmedUpdate(ledgerId, previousLAC, watcher);
}
@Override
public void cancelWaitForLastAddConfirmedUpdate(long ledgerId,
Watcher watcher)
throws IOException {
indexPersistenceManager.cancelWaitForLastAddConfirmedUpdate(ledgerId, watcher);
}
@Override
public void putEntryOffset(long ledger, long entry, long offset) throws IOException {
indexPageManager.putEntryOffset(ledger, entry, offset);
}
@Override
public long getEntryOffset(long ledger, long entry) throws IOException {
return indexPageManager.getEntryOffset(ledger, entry);
}
@Override
public void flushLedger(boolean doAll) throws IOException {
indexPageManager.flushOneOrMoreLedgers(doAll);
}
@Override
public long getLastEntry(long ledgerId) throws IOException {
// Get the highest entry from the pages that are in memory
long lastEntryInMem = indexPageManager.getLastEntryInMem(ledgerId);
// Some index pages may have been evicted from memory, retrieve the last entry
// from the persistent store. We will check if there could be an entry beyond the
// last in mem entry and only then attempt to get the last persisted entry from the file
// The latter is just an optimization
long lastEntry = indexPersistenceManager.getPersistEntryBeyondInMem(ledgerId, lastEntryInMem);
return lastEntry;
}
/**
* This method is called whenever a ledger is deleted by the BookKeeper Client
* and we want to remove all relevant data for it stored in the LedgerCache.
*/
@Override
public void deleteLedger(long ledgerId) throws IOException {
if (LOG.isDebugEnabled()) {
LOG.debug("Deleting ledgerId: {}", ledgerId);
}
indexPageManager.removePagesForLedger(ledgerId);
indexPersistenceManager.removeLedger(ledgerId);
}
@Override
public byte[] readMasterKey(long ledgerId) throws IOException, BookieException {
return indexPersistenceManager.readMasterKey(ledgerId);
}
@Override
public boolean setFenced(long ledgerId) throws IOException {
return indexPersistenceManager.setFenced(ledgerId);
}
@Override
public boolean isFenced(long ledgerId) throws IOException {
return indexPersistenceManager.isFenced(ledgerId);
}
@Override
public void setExplicitLac(long ledgerId, ByteBuf lac) throws IOException {
indexPersistenceManager.setExplicitLac(ledgerId, lac);
}
@Override
public ByteBuf getExplicitLac(long ledgerId) {
return indexPersistenceManager.getExplicitLac(ledgerId);
}
@Override
public void setMasterKey(long ledgerId, byte[] masterKey) throws IOException {
indexPersistenceManager.setMasterKey(ledgerId, masterKey);
}
@Override
public boolean ledgerExists(long ledgerId) throws IOException {
return indexPersistenceManager.ledgerExists(ledgerId);
}
@Override
public void close() throws IOException {
indexPersistenceManager.close();
}
@Override
public PageEntriesIterable listEntries(long ledgerId) throws IOException {
return indexPageManager.listEntries(ledgerId);
}
@Override
public LedgerIndexMetadata readLedgerIndexMetadata(long ledgerId) throws IOException {
return indexPersistenceManager.readLedgerIndexMetadata(ledgerId);
}
@Override
public OfLong getEntriesIterator(long ledgerId) throws IOException {
Iterator pageEntriesIteratorNonFinal = null;
try {
pageEntriesIteratorNonFinal = listEntries(ledgerId).iterator();
} catch (Bookie.NoLedgerException noLedgerException) {
pageEntriesIteratorNonFinal = Collections.emptyIterator();
}
final Iterator pageEntriesIterator = pageEntriesIteratorNonFinal;
return new OfLong() {
private OfLong entriesInCurrentLEPIterator = null;
{
if (pageEntriesIterator.hasNext()) {
entriesInCurrentLEPIterator = pageEntriesIterator.next().getLEP().getEntriesIterator();
}
}
@Override
public boolean hasNext() {
try {
while ((entriesInCurrentLEPIterator != null) && (!entriesInCurrentLEPIterator.hasNext())) {
if (pageEntriesIterator.hasNext()) {
entriesInCurrentLEPIterator = pageEntriesIterator.next().getLEP().getEntriesIterator();
} else {
entriesInCurrentLEPIterator = null;
}
}
return (entriesInCurrentLEPIterator != null);
} catch (Exception exc) {
throw new RuntimeException(
"Received exception in InterleavedLedgerStorage getEntriesOfLedger hasNext call", exc);
}
}
@Override
public long nextLong() {
if (!hasNext()) {
throw new NoSuchElementException();
}
return entriesInCurrentLEPIterator.nextLong();
}
};
}
}
