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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/Watcher.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; import org.apache.yetus.audience.InterfaceAudience; /** * This interface specifies the public interface an event handler class must * implement. A ZooKeeper client will get various events from the ZooKeeper * server it connects to. An application using such a client handles these * events by registering a callback object with the client. The callback object * is expected to be an instance of a class that implements Watcher interface. * */ @InterfaceAudience.Public public interface Watcher { /** * This interface defines the possible states an Event may represent */ @InterfaceAudience.Public interface Event { /** * Enumeration of states the ZooKeeper may be at the event */ @InterfaceAudience.Public enum KeeperState { /** Unused, this state is never generated by the server */ @Deprecated Unknown(-1), /** The client is in the disconnected state - it is not connected * to any server in the ensemble. */ Disconnected(0), /** Unused, this state is never generated by the server */ @Deprecated NoSyncConnected(1), /** The client is in the connected state - it is connected * to a server in the ensemble (one of the servers specified * in the host connection parameter during ZooKeeper client * creation). */ SyncConnected(3), /** * Auth failed state */ AuthFailed(4), /** * The client is connected to a read-only server, that is the * server which is not currently connected to the majority. * The only operations allowed after receiving this state is * read operations. * This state is generated for read-only clients only since * read/write clients aren't allowed to connect to r/o servers. */ ConnectedReadOnly(5), /** * SaslAuthenticated: used to notify clients that they are SASL-authenticated, * so that they can perform Zookeeper actions with their SASL-authorized permissions. */ SaslAuthenticated(6), /** The serving cluster has expired this session. The ZooKeeper * client connection (the session) is no longer valid. You must * create a new client connection (instantiate a new ZooKeeper * instance) if you with to access the ensemble. */ Expired(-112), /** * The client has been closed. This state is never generated by * the server, but is generated locally when a client calls * {@link ZooKeeper#close()} or {@link ZooKeeper#close(int)} */ Closed(7); private final int intValue; // Integer representation of value // for sending over wire KeeperState(int intValue) { this.intValue = intValue; } public int getIntValue() { return intValue; } public static KeeperState fromInt(int intValue) { switch (intValue) { case -1: return KeeperState.Unknown; case 0: return KeeperState.Disconnected; case 1: return KeeperState.NoSyncConnected; case 3: return KeeperState.SyncConnected; case 4: return KeeperState.AuthFailed; case 5: return KeeperState.ConnectedReadOnly; case 6: return KeeperState.SaslAuthenticated; case -112: return KeeperState.Expired; case 7: return KeeperState.Closed; default: throw new RuntimeException("Invalid integer value for conversion to KeeperState"); } } } /** * Enumeration of types of events that may occur on the ZooKeeper */ @InterfaceAudience.Public enum EventType { None(-1), NodeCreated(1), NodeDeleted(2), NodeDataChanged(3), NodeChildrenChanged(4), DataWatchRemoved(5), ChildWatchRemoved(6), PersistentWatchRemoved (7); private final int intValue; // Integer representation of value // for sending over wire EventType(int intValue) { this.intValue = intValue; } public int getIntValue() { return intValue; } public static EventType fromInt(int intValue) { switch (intValue) { case -1: return EventType.None; case 1: return EventType.NodeCreated; case 2: return EventType.NodeDeleted; case 3: return EventType.NodeDataChanged; case 4: return EventType.NodeChildrenChanged; case 5: return EventType.DataWatchRemoved; case 6: return EventType.ChildWatchRemoved; case 7: return EventType.PersistentWatchRemoved; default: throw new RuntimeException("Invalid integer value for conversion to EventType"); } } } } /** * Enumeration of types of watchers */ @InterfaceAudience.Public enum WatcherType { Children(1), Data(2), Any(3); // Integer representation of value private final int intValue; WatcherType(int intValue) { this.intValue = intValue; } public int getIntValue() { return intValue; } public static WatcherType fromInt(int intValue) { switch (intValue) { case 1: return WatcherType.Children; case 2: return WatcherType.Data; case 3: return WatcherType.Any; default: throw new RuntimeException("Invalid integer value for conversion to WatcherType"); } } } void process(WatchedEvent event); }
⏎ org/apache/zookeeper/Watcher.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, 13690👍, 0💬
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