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org.apache.bookkeeper.meta.CleanupLedgerManager Maven / Gradle / Ivy
/*
* 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.meta;
import com.google.common.annotations.VisibleForTesting;
import java.io.IOException;
import java.util.HashSet;
import java.util.Set;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.locks.ReentrantReadWriteLock;
import lombok.extern.slf4j.Slf4j;
import org.apache.bookkeeper.client.BKException;
import org.apache.bookkeeper.client.api.LedgerMetadata;
import org.apache.bookkeeper.common.concurrent.FutureUtils;
import org.apache.bookkeeper.proto.BookkeeperInternalCallbacks.GenericCallback;
import org.apache.bookkeeper.proto.BookkeeperInternalCallbacks.LedgerMetadataListener;
import org.apache.bookkeeper.proto.BookkeeperInternalCallbacks.Processor;
import org.apache.bookkeeper.versioning.Version;
import org.apache.bookkeeper.versioning.Versioned;
import org.apache.zookeeper.AsyncCallback;
/**
* A ledger manager that cleans up resources upon closing.
*/
@Slf4j
public class CleanupLedgerManager implements LedgerManager {
private class CleanupGenericCallback implements GenericCallback {
private final GenericCallback cb;
CleanupGenericCallback(GenericCallback cb) {
this.cb = cb;
addCallback(cb);
}
@Override
public void operationComplete(int rc, T result) {
closeLock.readLock().lock();
try {
if (!closed && null != removeCallback(cb)) {
cb.operationComplete(rc, result);
}
} finally {
closeLock.readLock().unlock();
}
}
}
private static class ClosedLedgerRangeIterator implements LedgerRangeIterator {
@Override
public boolean hasNext() throws IOException {
throw new IOException("Ledger manager is closed.");
}
@Override
public LedgerRange next() throws IOException {
throw new IOException("Ledger manager is closed.");
}
}
private final LedgerManager underlying;
private final ConcurrentMap callbacks =
new ConcurrentHashMap();
private boolean closed = false;
private final ReentrantReadWriteLock closeLock = new ReentrantReadWriteLock();
private final Set> futures = ConcurrentHashMap.newKeySet();
public CleanupLedgerManager(LedgerManager lm) {
this.underlying = lm;
}
@VisibleForTesting
public LedgerManager getUnderlying() {
return underlying;
}
private void addCallback(GenericCallback callback) {
callbacks.put(callback, callback);
}
@Override
public void registerLedgerMetadataListener(long ledgerId, LedgerMetadataListener listener) {
underlying.registerLedgerMetadataListener(ledgerId, listener);
}
@Override
public void unregisterLedgerMetadataListener(long ledgerId, LedgerMetadataListener listener) {
underlying.unregisterLedgerMetadataListener(ledgerId, listener);
}
private GenericCallback removeCallback(GenericCallback callback) {
return callbacks.remove(callback);
}
private void recordPromise(CompletableFuture promise) {
futures.add(promise);
promise.whenComplete((result, exception) -> {
futures.remove(promise);
});
}
@VisibleForTesting
int getCurrentFuturePromiseSize() {
return futures.size();
}
@Override
public CompletableFuture> createLedgerMetadata(long lid, LedgerMetadata metadata) {
closeLock.readLock().lock();
try {
if (closed) {
return closedPromise();
} else {
CompletableFuture> promise = underlying.createLedgerMetadata(lid, metadata);
recordPromise(promise);
return promise;
}
} finally {
closeLock.readLock().unlock();
}
}
@Override
public CompletableFuture removeLedgerMetadata(long ledgerId, Version version) {
closeLock.readLock().lock();
try {
if (closed) {
return closedPromise();
}
CompletableFuture promise = underlying.removeLedgerMetadata(ledgerId, version);
recordPromise(promise);
return promise;
} finally {
closeLock.readLock().unlock();
}
}
@Override
public CompletableFuture> readLedgerMetadata(long ledgerId) {
closeLock.readLock().lock();
try {
if (closed) {
return closedPromise();
}
CompletableFuture> promise = underlying.readLedgerMetadata(ledgerId);
recordPromise(promise);
return promise;
} finally {
closeLock.readLock().unlock();
}
}
@Override
public CompletableFuture> writeLedgerMetadata(long ledgerId, LedgerMetadata metadata,
Version currentVersion) {
closeLock.readLock().lock();
try {
if (closed) {
return closedPromise();
}
CompletableFuture> promise =
underlying.writeLedgerMetadata(ledgerId, metadata, currentVersion);
recordPromise(promise);
return promise;
} finally {
closeLock.readLock().unlock();
}
}
@Override
public void asyncProcessLedgers(Processor processor,
final AsyncCallback.VoidCallback finalCb, final Object context,
final int successRc, final int failureRc) {
closeLock.readLock().lock();
try {
if (closed) {
finalCb.processResult(failureRc, null, context);
return;
}
final GenericCallback stub = new GenericCallback() {
@Override
public void operationComplete(int rc, Void result) {
finalCb.processResult(failureRc, null, context);
}
};
addCallback(stub);
underlying.asyncProcessLedgers(processor, new AsyncCallback.VoidCallback() {
@Override
public void processResult(int rc, String path, Object ctx) {
if (null != removeCallback(stub)) {
finalCb.processResult(rc, path, ctx);
}
}
}, context, successRc, failureRc);
} finally {
closeLock.readLock().unlock();
}
}
@Override
public LedgerRangeIterator getLedgerRanges(long zkOpTimeoutMs) {
closeLock.readLock().lock();
try {
if (closed) {
return new ClosedLedgerRangeIterator();
}
return underlying.getLedgerRanges(zkOpTimeoutMs);
} finally {
closeLock.readLock().unlock();
}
}
@Override
@SuppressWarnings("unchecked")
public void close() throws IOException {
Set keys;
closeLock.writeLock().lock();
try {
if (closed) {
return;
}
closed = true;
keys = new HashSet(callbacks.keySet());
} finally {
closeLock.writeLock().unlock();
}
for (GenericCallback key : keys) {
GenericCallback callback = callbacks.remove(key);
if (null != callback) {
callback.operationComplete(BKException.Code.ClientClosedException, null);
}
}
BKException exception = new BKException.BKClientClosedException();
futures.forEach((f) -> f.completeExceptionally(exception));
futures.clear();
underlying.close();
}
private static CompletableFuture closedPromise() {
return FutureUtils.exception(new BKException.BKClientClosedException());
}
}
