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Apache ZooKeeper 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 package file, apache-zookeeper-3.8.0.tar.gz.
You can download apache-zookeeper-3.8.0.tar.gz as described in the previous tutorial and go to the "zookeeper-server" sub-folder to view Apache ZooKeeper Server Source Code files.
You can also browse Apache ZooKeeper Server Source Code below:
✍: FYIcenter.com
⏎ org/apache/zookeeper/server/quorum/UpgradeableSessionTracker.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.quorum; import java.util.Collections; import java.util.Set; import java.util.concurrent.ConcurrentHashMap; import java.util.concurrent.ConcurrentMap; import org.apache.zookeeper.KeeperException; import org.apache.zookeeper.server.SessionTracker; import org.apache.zookeeper.server.ZooKeeperServerListener; import org.slf4j.Logger; import org.slf4j.LoggerFactory; /** * A session tracker that supports upgradeable local sessions. */ public abstract class UpgradeableSessionTracker implements SessionTracker { private static final Logger LOG = LoggerFactory.getLogger(UpgradeableSessionTracker.class); private ConcurrentMap<Long, Integer> localSessionsWithTimeouts; private ConcurrentMap<Long, Integer> upgradingSessions; protected LocalSessionTracker localSessionTracker; protected boolean localSessionsEnabled; public void start() { } public void createLocalSessionTracker(SessionExpirer expirer, int tickTime, long id, ZooKeeperServerListener listener) { this.localSessionsWithTimeouts = new ConcurrentHashMap<Long, Integer>(); this.localSessionTracker = new LocalSessionTracker(expirer, this.localSessionsWithTimeouts, tickTime, id, listener); this.upgradingSessions = new ConcurrentHashMap<Long, Integer>(); } public boolean isTrackingSession(long sessionId) { return isLocalSession(sessionId) || isGlobalSession(sessionId); } public boolean isLocalSession(long sessionId) { return localSessionTracker != null && localSessionTracker.isTrackingSession(sessionId); } @Override public boolean isLocalSessionsEnabled() { return localSessionsEnabled; } public boolean isUpgradingSession(long sessionId) { return upgradingSessions != null && upgradingSessions.containsKey(sessionId); } public void finishedUpgrading(long sessionId) { if (upgradingSessions != null) { upgradingSessions.remove(sessionId); } } public abstract boolean isGlobalSession(long sessionId); /** * Upgrades the session to a global session. * This simply removes the session from the local tracker and marks * it as global. It is up to the caller to actually * queue up a transaction for the session. * * @param sessionId * @return session timeout (-1 if not a local session) */ public int upgradeSession(long sessionId) { if (localSessionsWithTimeouts == null) { return -1; } // We won't race another upgrade attempt because only one thread // will get the timeout from the map Integer timeout = localSessionsWithTimeouts.remove(sessionId); if (timeout != null) { LOG.info("Upgrading session 0x{}", Long.toHexString(sessionId)); // Track global session, which will add to global session tracker // on leader and do nothing on learner. Need to start track global // session in leader now to update the session expire between // LeaderRequestProcessor and PrepRequestProcessor. trackSession(sessionId, timeout); // Track ongoing upgrading sessions, learner will use it to find // other sessions it has which are not in local and global sessions upgradingSessions.put(sessionId, timeout); localSessionTracker.removeSession(sessionId); return timeout; } return -1; } protected void removeLocalSession(long sessionId) { if (localSessionTracker == null) { return; } localSessionTracker.removeSession(sessionId); } public void checkGlobalSession(long sessionId, Object owner) throws KeeperException.SessionExpiredException, KeeperException.SessionMovedException { throw new UnsupportedOperationException(); } public long getLocalSessionCount() { if (localSessionsWithTimeouts == null) { return 0; } return localSessionsWithTimeouts.size(); } public Set<Long> localSessions() { return (localSessionTracker == null) ? Collections.<Long>emptySet() : localSessionTracker.localSessions(); } }
⏎ org/apache/zookeeper/server/quorum/UpgradeableSessionTracker.java
Or download all of them as a single archive file:
File name: zookeeper-server-3.8.0-fyi.zip File size: 885581 bytes Release date: 2022-02-25 Download
⇒ Apache ZooKeeper Jute Source Code
⇐ Download and Install Apache ZooKeeper Source Package
2022-11-16, 13091👍, 0💬
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