| /* |
| * 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.clients.impl.channel; |
| |
| import com.google.common.annotations.VisibleForTesting; |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.concurrent.ConcurrentMap; |
| import java.util.concurrent.locks.ReentrantReadWriteLock; |
| import java.util.function.Function; |
| import javax.annotation.Nullable; |
| import lombok.extern.slf4j.Slf4j; |
| import org.apache.bookkeeper.clients.config.StorageClientSettings; |
| import org.apache.bookkeeper.stream.proto.common.Endpoint; |
| |
| /** |
| * A manager manages channels to range servers. |
| */ |
| @Slf4j |
| public class StorageServerChannelManager implements AutoCloseable { |
| |
| private final ReentrantReadWriteLock lock; |
| private boolean closed = false; |
| private final ConcurrentMap<Endpoint, StorageServerChannel> channels; |
| private final Function<Endpoint, StorageServerChannel> channelFactory; |
| |
| public StorageServerChannelManager(StorageClientSettings settings) { |
| this(StorageServerChannel.factory(settings)); |
| } |
| |
| @VisibleForTesting |
| public StorageServerChannelManager(Function<Endpoint, StorageServerChannel> channelFactory) { |
| this.channels = new ConcurrentHashMap<>(); |
| this.lock = new ReentrantReadWriteLock(); |
| this.channelFactory = channelFactory; |
| } |
| |
| @VisibleForTesting |
| int getNumChannels() { |
| return channels.size(); |
| } |
| |
| @VisibleForTesting |
| boolean contains(Endpoint endpoint) { |
| lock.readLock().lock(); |
| try { |
| return channels.containsKey(endpoint); |
| } finally { |
| lock.readLock().unlock(); |
| } |
| } |
| |
| public boolean addStorageServer(Endpoint endpoint, StorageServerChannel channel) { |
| lock.readLock().lock(); |
| try { |
| if (closed) { |
| log.warn("Skip adding channel {} of range server {} since the channel manager is already closed", |
| channel, endpoint); |
| channel.close(); |
| return false; |
| } |
| |
| StorageServerChannel oldChannel = channels.putIfAbsent(endpoint, channel); |
| if (null != oldChannel) { |
| log.debug("KeyRange server ({}) already existed in the channel manager."); |
| channel.close(); |
| return false; |
| } else { |
| log.info("Added range server ({}) into the channel manager.", endpoint); |
| return true; |
| } |
| } finally { |
| lock.readLock().unlock(); |
| } |
| } |
| |
| public StorageServerChannel getOrCreateChannel(Endpoint endpoint) { |
| StorageServerChannel channel = getChannel(endpoint); |
| if (null != channel) { |
| return channel; |
| } |
| // no channel exists |
| StorageServerChannel newChannel = channelFactory.apply(endpoint); |
| addStorageServer(endpoint, newChannel); |
| return getChannel(endpoint); |
| } |
| |
| @Nullable |
| public StorageServerChannel getChannel(Endpoint endpoint) { |
| lock.readLock().lock(); |
| try { |
| return channels.get(endpoint); |
| } finally { |
| lock.readLock().unlock(); |
| } |
| } |
| |
| @Nullable |
| public StorageServerChannel removeChannel(Endpoint endpoint, StorageServerChannel channel) { |
| lock.readLock().lock(); |
| try { |
| if (closed) { |
| log.warn("Skip removing channel {} of range server {} since the channel manager is already closed", |
| channel, endpoint); |
| return null; |
| } |
| |
| StorageServerChannel channelRemoved; |
| if (null == channel) { |
| channelRemoved = channels.remove(endpoint); |
| } else { |
| if (channels.remove(endpoint, channel)) { |
| channelRemoved = channel; |
| } else { |
| channelRemoved = null; |
| } |
| } |
| if (null == channelRemoved) { |
| log.debug("No channel associated with endpoint {} to be removed."); |
| } else { |
| log.info("Removed channel {} for range server {} successfully", |
| channelRemoved, endpoint); |
| } |
| if (null != channelRemoved) { |
| channelRemoved.close(); |
| } |
| return channelRemoved; |
| } finally { |
| lock.readLock().unlock(); |
| } |
| } |
| |
| @Override |
| public void close() { |
| lock.writeLock().lock(); |
| try { |
| if (closed) { |
| return; |
| } |
| closed = true; |
| } finally { |
| lock.writeLock().unlock(); |
| } |
| // close the channels |
| channels.values().forEach(StorageServerChannel::close); |
| channels.clear(); |
| } |
| } |