| /* |
| * 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.iotdb.commons.subscription.meta.topic; |
| |
| import org.apache.tsfile.utils.ReadWriteIOUtils; |
| |
| import java.io.FileInputStream; |
| import java.io.FileOutputStream; |
| import java.io.IOException; |
| import java.util.Map; |
| import java.util.Objects; |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.concurrent.locks.ReentrantReadWriteLock; |
| |
| public class TopicMetaKeeper { |
| |
| private final Map<String, TopicMeta> topicNameToTopicMetaMap; |
| |
| private final ReentrantReadWriteLock topicMetaKeeperLock; |
| |
| public TopicMetaKeeper() { |
| topicNameToTopicMetaMap = new ConcurrentHashMap<>(); |
| topicMetaKeeperLock = new ReentrantReadWriteLock(true); |
| } |
| |
| ///////////////////////////////// Lock ///////////////////////////////// |
| |
| public void acquireReadLock() { |
| topicMetaKeeperLock.readLock().lock(); |
| } |
| |
| public void releaseReadLock() { |
| topicMetaKeeperLock.readLock().unlock(); |
| } |
| |
| public void acquireWriteLock() { |
| topicMetaKeeperLock.writeLock().lock(); |
| } |
| |
| public void releaseWriteLock() { |
| topicMetaKeeperLock.writeLock().unlock(); |
| } |
| |
| ///////////////////////////////// TopicMeta ///////////////////////////////// |
| |
| public void addTopicMeta(String topicName, TopicMeta topicMeta) { |
| topicNameToTopicMetaMap.put(topicName, topicMeta); |
| } |
| |
| public TopicMeta getTopicMeta(String topicName) { |
| return topicNameToTopicMetaMap.get(topicName); |
| } |
| |
| public Iterable<TopicMeta> getAllTopicMeta() { |
| return topicNameToTopicMetaMap.values(); |
| } |
| |
| public void removeTopicMeta(String topicName) { |
| topicNameToTopicMetaMap.remove(topicName); |
| } |
| |
| public boolean containsTopicMeta(String topicName) { |
| return topicNameToTopicMetaMap.containsKey(topicName); |
| } |
| |
| public void clear() { |
| this.topicNameToTopicMetaMap.clear(); |
| } |
| |
| public boolean isEmpty() { |
| return topicNameToTopicMetaMap.isEmpty(); |
| } |
| |
| ///////////////////////////////// Snapshot ///////////////////////////////// |
| |
| public void processTakeSnapshot(FileOutputStream fileOutputStream) throws IOException { |
| ReadWriteIOUtils.write(topicNameToTopicMetaMap.size(), fileOutputStream); |
| for (Map.Entry<String, TopicMeta> entry : topicNameToTopicMetaMap.entrySet()) { |
| ReadWriteIOUtils.write(entry.getKey(), fileOutputStream); |
| entry.getValue().serialize(fileOutputStream); |
| } |
| } |
| |
| public void processLoadSnapshot(FileInputStream fileInputStream) throws IOException { |
| clear(); |
| |
| final int size = ReadWriteIOUtils.readInt(fileInputStream); |
| for (int i = 0; i < size; i++) { |
| final String topicName = ReadWriteIOUtils.readString(fileInputStream); |
| topicNameToTopicMetaMap.put(topicName, TopicMeta.deserialize(fileInputStream)); |
| } |
| } |
| |
| ///////////////////////////////// Override ///////////////////////////////// |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) { |
| return true; |
| } |
| if (o == null || getClass() != o.getClass()) { |
| return false; |
| } |
| TopicMetaKeeper that = (TopicMetaKeeper) o; |
| return Objects.equals(topicNameToTopicMetaMap, that.topicNameToTopicMetaMap); |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hash(topicNameToTopicMetaMap); |
| } |
| |
| @Override |
| public String toString() { |
| return "TopicMetaKeeper{" + "topicNameToTopicMetaMap=" + topicNameToTopicMetaMap + '}'; |
| } |
| } |