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Apache ZooKeeper 3.7.0 Server Source Code
Apache ZooKeeper is an open-source server which enables highly
reliable distributed coordination.
Apache ZooKeeper Server Source Code files are provided in the source packge (apache-zookeeper-3.7.0.tar.gz). You can download it at Apache ZooKeeper Website.
You can also browse Apache ZooKeeper Server Source Code below:
✍: FYIcenter.com
⏎ org/apache/zookeeper/server/util/BitMap.java
/* * 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.zookeeper.server.util; import edu.umd.cs.findbugs.annotations.SuppressFBWarnings; import java.util.BitSet; import java.util.HashMap; import java.util.Map; import java.util.concurrent.locks.ReentrantReadWriteLock; /** * This is a helper class to maintain the bit to specific value and the * reversed value to bit mapping. */ public class BitMap<T> { private final Map<T, Integer> value2Bit = new HashMap<T, Integer>(); private final Map<Integer, T> bit2Value = new HashMap<Integer, T>(); private final BitSet freedBitSet = new BitSet(); private Integer nextBit = Integer.valueOf(0); private final ReentrantReadWriteLock rwLock = new ReentrantReadWriteLock(); @SuppressFBWarnings(value = "DLS_DEAD_LOCAL_STORE", justification = "SpotBugs false positive") public Integer add(T value) { /* * Optimized for code which will add the same value again and again, * more specifically this is used to add new bit for watcher, and * the same watcher may watching thousands or even millions of nodes, * which will call add the same value of this function, check exist * using read lock will optimize the performance here. */ Integer bit = getBit(value); if (bit != null) { return bit; } rwLock.writeLock().lock(); try { bit = value2Bit.get(value); if (bit != null) { return bit; } bit = freedBitSet.nextSetBit(0); if (bit > -1) { freedBitSet.clear(bit); } else { bit = nextBit++; } value2Bit.put(value, bit); bit2Value.put(bit, value); return bit; } finally { rwLock.writeLock().unlock(); } } public T get(int bit) { rwLock.readLock().lock(); try { return bit2Value.get(bit); } finally { rwLock.readLock().unlock(); } } public Integer getBit(T value) { rwLock.readLock().lock(); try { return value2Bit.get(value); } finally { rwLock.readLock().unlock(); } } public int remove(T value) { /* * remove only called once when the session is closed, so use write * lock directly without checking read lock. */ rwLock.writeLock().lock(); try { Integer bit = value2Bit.get(value); if (bit == null) { return -1; } value2Bit.remove(value); bit2Value.remove(bit); freedBitSet.set(bit); return bit; } finally { rwLock.writeLock().unlock(); } } public T remove(int bit) { rwLock.writeLock().lock(); try { T value = bit2Value.get(bit); if (value == null) { return null; } value2Bit.remove(value); bit2Value.remove(bit); freedBitSet.set(bit); return value; } finally { rwLock.writeLock().unlock(); } } public int size() { rwLock.readLock().lock(); try { return value2Bit.size(); } finally { rwLock.readLock().unlock(); } } }
⏎ org/apache/zookeeper/server/util/BitMap.java
Or download all of them as a single archive file:
File name: zookeeper-server-3.7.0-fyi.zip File size: 871011 bytes Release date: 2021-05-17 Download
⇒ Apache ZooKeeper 3.7.0 Jute Source Code
⇐ Download Apache ZooKeeper 3.7.0 Source Package
2022-11-16, 24809👍, 0💬
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