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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/ResponseCache.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; import java.util.Collections; import java.util.LinkedHashMap; import java.util.Map; import org.apache.zookeeper.data.Stat; import org.slf4j.Logger; import org.slf4j.LoggerFactory; @SuppressWarnings("serial") public class ResponseCache { private static final Logger LOG = LoggerFactory.getLogger(ResponseCache.class); // Magic number chosen to be "big enough but not too big" public static final int DEFAULT_RESPONSE_CACHE_SIZE = 400; private final int cacheSize; private static class Entry { public Stat stat; public byte[] data; } private final Map<String, Entry> cache; public ResponseCache(int cacheSize, String requestType) { this.cacheSize = cacheSize; cache = Collections.synchronizedMap(new LRUCache<>(cacheSize)); LOG.info("{} response cache size is initialized with value {}.", requestType, cacheSize); } public int getCacheSize() { return cacheSize; } public void put(String path, byte[] data, Stat stat) { Entry entry = new Entry(); entry.data = data; entry.stat = stat; cache.put(path, entry); } public byte[] get(String key, Stat stat) { Entry entry = cache.get(key); if (entry == null) { return null; } if (!stat.equals(entry.stat)) { // The node has been modified, invalidate cache. cache.remove(key); return null; } else { return entry.data; } } public boolean isEnabled() { return cacheSize > 0; } private static class LRUCache<K, V> extends LinkedHashMap<K, V> { private int cacheSize; LRUCache(int cacheSize) { super(cacheSize / 4); this.cacheSize = cacheSize; } protected boolean removeEldestEntry(Map.Entry<K, V> eldest) { return size() >= cacheSize; } } }
⏎ org/apache/zookeeper/server/ResponseCache.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, 13210👍, 0💬
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