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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/ReferenceCountedACLCache.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.io.IOException; import java.util.ArrayList; import java.util.HashMap; import java.util.Iterator; import java.util.LinkedHashMap; import java.util.List; import java.util.Map; import java.util.concurrent.atomic.AtomicLong; import org.apache.jute.Index; import org.apache.jute.InputArchive; import org.apache.jute.OutputArchive; import org.apache.zookeeper.ZooDefs; import org.apache.zookeeper.data.ACL; import org.slf4j.Logger; import org.slf4j.LoggerFactory; public class ReferenceCountedACLCache { private static final Logger LOG = LoggerFactory.getLogger(ReferenceCountedACLCache.class); final Map<Long, List<ACL>> longKeyMap = new HashMap<Long, List<ACL>>(); final Map<List<ACL>, Long> aclKeyMap = new HashMap<List<ACL>, Long>(); final Map<Long, AtomicLongWithEquals> referenceCounter = new HashMap<Long, AtomicLongWithEquals>(); private static final long OPEN_UNSAFE_ACL_ID = -1L; /** * these are the number of acls that we have in the datatree */ long aclIndex = 0; /** * converts the list of acls to a long. * Increments the reference counter for this ACL. * @param acls * @return a long that map to the acls */ public synchronized Long convertAcls(List<ACL> acls) { if (acls == null) { return OPEN_UNSAFE_ACL_ID; } // get the value from the map Long ret = aclKeyMap.get(acls); if (ret == null) { ret = incrementIndex(); longKeyMap.put(ret, acls); aclKeyMap.put(acls, ret); } addUsage(ret); return ret; } /** * converts a long to a list of acls. * * @param longVal * @return a list of ACLs that map to the long */ public synchronized List<ACL> convertLong(Long longVal) { if (longVal == null) { return null; } if (longVal == OPEN_UNSAFE_ACL_ID) { return ZooDefs.Ids.OPEN_ACL_UNSAFE; } List<ACL> acls = longKeyMap.get(longVal); if (acls == null) { LOG.error("ERROR: ACL not available for long {}", longVal); throw new RuntimeException("Failed to fetch acls for " + longVal); } return acls; } private long incrementIndex() { return ++aclIndex; } public void deserialize(InputArchive ia) throws IOException { clear(); int i = ia.readInt("map"); LinkedHashMap<Long, List<ACL>> deserializedMap = new LinkedHashMap<>(); // keep read operations out of synchronization block while (i > 0) { Long val = ia.readLong("long"); List<ACL> aclList = new ArrayList<ACL>(); Index j = ia.startVector("acls"); if (j == null) { throw new RuntimeException("Incorrent format of InputArchive when deserialize DataTree - missing acls"); } while (!j.done()) { ACL acl = new ACL(); acl.deserialize(ia, "acl"); aclList.add(acl); j.incr(); } deserializedMap.put(val, aclList); i--; } synchronized (this) { for (Map.Entry<Long, List<ACL>> entry : deserializedMap.entrySet()) { Long val = entry.getKey(); List<ACL> aclList = entry.getValue(); if (aclIndex < val) { aclIndex = val; } longKeyMap.put(val, aclList); aclKeyMap.put(aclList, val); referenceCounter.put(val, new AtomicLongWithEquals(0)); } } } public void serialize(OutputArchive oa) throws IOException { Map<Long, List<ACL>> clonedLongKeyMap; synchronized (this) { clonedLongKeyMap = new HashMap<>(longKeyMap); } oa.writeInt(clonedLongKeyMap.size(), "map"); for (Map.Entry<Long, List<ACL>> val : clonedLongKeyMap.entrySet()) { oa.writeLong(val.getKey(), "long"); List<ACL> aclList = val.getValue(); oa.startVector(aclList, "acls"); for (ACL acl : aclList) { acl.serialize(oa, "acl"); } oa.endVector(aclList, "acls"); } } public int size() { return aclKeyMap.size(); } private void clear() { aclKeyMap.clear(); longKeyMap.clear(); referenceCounter.clear(); } public synchronized void addUsage(Long acl) { if (acl == OPEN_UNSAFE_ACL_ID) { return; } if (!longKeyMap.containsKey(acl)) { LOG.info("Ignoring acl {} as it does not exist in the cache", acl); return; } AtomicLong count = referenceCounter.get(acl); if (count == null) { referenceCounter.put(acl, new AtomicLongWithEquals(1)); } else { count.incrementAndGet(); } } public synchronized void removeUsage(Long acl) { if (acl == OPEN_UNSAFE_ACL_ID) { return; } if (!longKeyMap.containsKey(acl)) { LOG.info("Ignoring acl {} as it does not exist in the cache", acl); return; } long newCount = referenceCounter.get(acl).decrementAndGet(); if (newCount <= 0) { referenceCounter.remove(acl); aclKeyMap.remove(longKeyMap.get(acl)); longKeyMap.remove(acl); } } public synchronized void purgeUnused() { Iterator<Map.Entry<Long, AtomicLongWithEquals>> refCountIter = referenceCounter.entrySet().iterator(); while (refCountIter.hasNext()) { Map.Entry<Long, AtomicLongWithEquals> entry = refCountIter.next(); if (entry.getValue().get() <= 0) { Long acl = entry.getKey(); aclKeyMap.remove(longKeyMap.get(acl)); longKeyMap.remove(acl); refCountIter.remove(); } } } private static class AtomicLongWithEquals extends AtomicLong { private static final long serialVersionUID = 3355155896813725462L; public AtomicLongWithEquals(long i) { super(i); } @Override public boolean equals(Object o) { if (this == o) { return true; } if (o == null || getClass() != o.getClass()) { return false; } return equals((AtomicLongWithEquals) o); } public boolean equals(AtomicLongWithEquals that) { return get() == that.get(); } @Override public int hashCode() { return 31 * Long.valueOf(get()).hashCode(); } } }
⏎ org/apache/zookeeper/server/ReferenceCountedACLCache.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, 24851👍, 0💬
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