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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/DigestCalculator.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.nio.ByteBuffer; import java.util.zip.CRC32; import org.apache.zookeeper.ZooDefs; import org.apache.zookeeper.data.StatPersisted; /** * Defines how to calculate the digest for a given node. */ public class DigestCalculator { // The hardcoded digest version, should bump up this version whenever // we changed the digest method or fields. private static final int DIGEST_VERSION = 2; /** * Calculate the digest based on the given params. * * Besides the path and data, the following stat fields are included in * the digest calculation: * * - long czxid 8 bytes * - long mzxid 8 bytes * - long pzxid 8 bytes * - long ctime 8 bytes * - long mtime 8 bytes * - int version 4 bytes * - int cversion 4 bytes * - int aversion 4 bytes * - long ephemeralOwner 8 bytes * * @param path the path of the node * @param data the data of the node * @param stat the stat associated with the node * @return the digest calculated from the given params */ long calculateDigest(String path, byte[] data, StatPersisted stat) { if (!ZooKeeperServer.isDigestEnabled()) { return 0; } // Quota nodes are updated locally, there is inconsistent issue // when we tried to release digest feature at the beginning. // // Instead of taking time to fix that, we decided to disable digest // check for all the nodes under /zookeeper/ first. // // We can enable this after fixing that inconsistent problem. The // digest version in the protocol enables us to change the digest // calculation without disrupting the system. if (path.startsWith(ZooDefs.ZOOKEEPER_NODE_SUBTREE)) { return 0; } // "" and "/" are aliases to each other, in DataTree when adding child // under "/", it will use "" as the path, but when set data or change // ACL on "/", it will use "/" as the path. Always mapping "/" to "" // to avoid mismatch. if (path.equals("/")) { path = ""; } // total = 8 * 6 + 4 * 3 = 60 bytes byte[] b = new byte[60]; ByteBuffer bb = ByteBuffer.wrap(b); bb.putLong(stat.getCzxid()); bb.putLong(stat.getMzxid()); bb.putLong(stat.getPzxid()); bb.putLong(stat.getCtime()); bb.putLong(stat.getMtime()); bb.putInt(stat.getVersion()); bb.putInt(stat.getCversion()); bb.putInt(stat.getAversion()); bb.putLong(stat.getEphemeralOwner()); CRC32 crc = new CRC32(); crc.update(path.getBytes()); if (data != null) { crc.update(data); } crc.update(b); return crc.getValue(); } /** * Calculate the digest based on the given path and data node. */ long calculateDigest(String path, DataNode node) { if (!node.isDigestCached()) { node.setDigest(calculateDigest(path, node.getData(), node.stat)); node.setDigestCached(true); } return node.getDigest(); } /** * Returns with the current digest version. */ int getDigestVersion() { return DIGEST_VERSION; } }
⏎ org/apache/zookeeper/server/DigestCalculator.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, 24853👍, 0💬
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