Zookeeper reelection leader

leader-elecation-zookeeper/.idea/.name

+LeaderElection.java
\ No newline at end of file

leader-elecation-zookeeper/.idea/artifacts/leader_elecation_zookeeper_jar.xml

+<component name="ArtifactManager">
+  <artifact type="jar" name="leader-elecation-zookeeper:jar">
+    <output-path>$PROJECT_DIR$/out/artifacts/leader_elecation_zookeeper_jar</output-path>
+    <root id="archive" name="leader-elecation-zookeeper.jar">
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+      <element id="extracted-dir" path="$MAVEN_REPOSITORY$/org/apache/yetus/audience-annotations/0.12.0/audience-annotations-0.12.0.jar" path-in-jar="/" />
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+    </root>
+  </artifact>
+</component>
\ No newline at end of file

leader-elecation-zookeeper/.idea/compiler.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CompilerConfiguration">
+    <annotationProcessing>
+      <profile name="Maven default annotation processors profile" enabled="true">
+        <sourceOutputDir name="target/generated-sources/annotations" />
+        <sourceTestOutputDir name="target/generated-test-sources/test-annotations" />
+        <outputRelativeToContentRoot value="true" />
+        <module name="leader-elecation-zookeeper" />
+      </profile>
+    </annotationProcessing>
+  </component>
+</project>
\ No newline at end of file

leader-elecation-zookeeper/.idea/encodings.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Encoding">
+    <file url="file://$PROJECT_DIR$/src/main/java" charset="UTF-8" />
+    <file url="file://$PROJECT_DIR$/src/main/resources" charset="UTF-8" />
+  </component>
+</project>
\ No newline at end of file

leader-elecation-zookeeper/.idea/jarRepositories.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="RemoteRepositoriesConfiguration">
+    <remote-repository>
+      <option name="id" value="central" />
+      <option name="name" value="Central Repository" />
+      <option name="url" value="https://repo.maven.apache.org/maven2" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="central" />
+      <option name="name" value="Maven Central repository" />
+      <option name="url" value="https://repo1.maven.org/maven2" />
+    </remote-repository>
+    <remote-repository>
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\ No newline at end of file

leader-elecation-zookeeper/.idea/misc.xml

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+<project version="4">
+  <component name="ExternalStorageConfigurationManager" enabled="true" />
+  <component name="MavenProjectsManager">
+    <option name="originalFiles">
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+</project>
\ No newline at end of file

leader-elecation-zookeeper/.idea/uiDesigner.xml

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+<project version="4">
+  <component name="Palette2">
+    <group name="Swing">
+      <item class="com.intellij.uiDesigner.HSpacer" tooltip-text="Horizontal Spacer" icon="/com/intellij/uiDesigner/icons/hspacer.svg" removable="false" auto-create-binding="false" can-attach-label="false">
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+    </group>
+  </component>
+</project>
\ No newline at end of file

leader-elecation-zookeeper/.idea/vcs.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file

leader-elecation-zookeeper/.idea/workspace.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ArtifactsWorkspaceSettings">
+    <artifacts-to-build>
+      <artifact name="leader-elecation-zookeeper:jar" />
+    </artifacts-to-build>
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+      <change afterPath="$PROJECT_DIR$/.idea/misc.xml" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/.idea/uiDesigner.xml" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/.idea/vcs.xml" afterDir="false" />
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+      <change afterPath="$PROJECT_DIR$/pom.xml" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/src/main/java/org/example/LeaderElection.java" afterDir="false" />
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\ No newline at end of file

leader-elecation-zookeeper/pom.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>org.example</groupId>
+    <artifactId>leader-elecation-zookeeper</artifactId>
+    <version>1.0-SNAPSHOT</version>
+    <properties>
+        <maven.compiler.source>8</maven.compiler.source>
+        <maven.compiler.target>8</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>3.11.0</version>
+                <configuration>
+                    <source>8</source>
+                    <target>8</target>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+    <dependencies>
+        <dependency>
+            <groupId>org.apache.zookeeper</groupId>
+            <artifactId>zookeeper</artifactId>
+            <version>3.9.1</version>
+        </dependency>
+
+    </dependencies>
+</project>
\ No newline at end of file

leader-elecation-zookeeper/src/main/java/org/example/LeaderElection.java

+package org.example;
+
+import org.apache.zookeeper.*;
+import org.apache.zookeeper.data.Stat;
+
+import java.io.IOException;
+import java.util.Collections;
+import java.util.List;
+
+public class LeaderElection implements Watcher {
+    private static final String ADDRESS = "192.168.181.136:2181";
+    private static final int SESSION_TIMEOUT = 3000;
+    private static final String ELECTION_NAMESPACE = "/election";
+    private static final String LEADER_NODE_PREFIX = "leader-";
+
+    private String currentNodePath;
+    private String previousNodePath;
+    private ZooKeeper zooKeeper;
+    private Stat previousNodeStat;
+
+    public static void main(String[] args) throws IOException, InterruptedException, KeeperException {
+        LeaderElection leaderElection = new LeaderElection();
+        leaderElection.connectToZookeeper();
+        leaderElection.volunteerForLeadership();
+        leaderElection.electLeader();
+        leaderElection.run();
+    }
+
+    public void connectToZookeeper() throws IOException {
+        this.zooKeeper = new ZooKeeper(ADDRESS, SESSION_TIMEOUT, this);
+    }
+
+    public void run() {
+        synchronized (zooKeeper) {
+            try {
+                zooKeeper.wait(); // Wait for events
+            } catch (InterruptedException e) {
+                System.out.println(e.getMessage());
+            }
+        }
+        try {
+            zooKeeper.close();
+        } catch (InterruptedException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    public void volunteerForLeadership() throws InterruptedException, KeeperException {
+        String znodeFullPath = zooKeeper.create(
+                ELECTION_NAMESPACE + "/" + LEADER_NODE_PREFIX,
+                new byte[]{},
+                ZooDefs.Ids.OPEN_ACL_UNSAFE,
+                CreateMode.EPHEMERAL_SEQUENTIAL
+        );
+
+        System.out.println("Created znode: " + znodeFullPath);
+        this.currentNodePath = znodeFullPath.replace(ELECTION_NAMESPACE + "/", "");
+    }
+
+    public void electLeader() throws InterruptedException, KeeperException {
+        List<String> children = zooKeeper.getChildren(ELECTION_NAMESPACE, false);
+
+        Collections.sort(children);
+        int currentNodeIndex = children.indexOf(currentNodePath);
+
+        if (currentNodeIndex == 0) {
+            becomeLeader();
+        } else {
+            String previousNodeName = children.get(currentNodeIndex - 1);
+            previousNodePath = ELECTION_NAMESPACE + "/" + previousNodeName;
+            System.out.println("I'm not the leader, the leader is: " + children.get(0));
+            watchPreviousNode();
+        }
+    }
+
+    private void becomeLeader() throws KeeperException, InterruptedException {
+        System.out.println("I'm the leader");
+        // Notify other nodes that you are the leader
+        String leaderData = "Leader: " + currentNodePath;
+        zooKeeper.setData(ELECTION_NAMESPACE+"/"+currentNodePath, leaderData.getBytes(), -1);
+    }
+
+    private void watchPreviousNode() throws KeeperException, InterruptedException {
+        previousNodeStat = zooKeeper.exists(previousNodePath, this);
+        if (previousNodeStat != null) {
+            System.out.println("Watching previous node: " + previousNodePath);
+        }
+    }
+    private void setData() throws InterruptedException, KeeperException {
+        // Retrieve leader data from the previous leader's znode, because it contains our new leader
+        byte[] data = zooKeeper.getData(previousNodePath, this, previousNodeStat);
+        String leaderData = new String(data);
+        zooKeeper.setData(ELECTION_NAMESPACE+"/"+currentNodePath,data,-1);
+        System.out.println("Current leader: " + leaderData);
+    }
+    @Override
+    public void process(WatchedEvent watchedEvent) {
+        switch (watchedEvent.getType()) {
+            case None:
+                if (watchedEvent.getState() == Event.KeeperState.SyncConnected) {
+                    System.out.println("Successfully connected to ZooKeeper");
+                } else if (watchedEvent.getState() == Event.KeeperState.Disconnected) {
+                    System.out.println("Disconnected from ZooKeeper. Shutting down the program.");
+                    synchronized (zooKeeper) {
+                        zooKeeper.notifyAll();
+                    }
+                }
+                break;
+            case NodeDeleted:
+                if (watchedEvent.getPath().equals(previousNodePath)) {
+                    System.out.println("Previous leader node deleted. Attempting to become the new leader...");
+                    try {
+                        electLeader();
+                    } catch (InterruptedException | KeeperException e) {
+                        throw new RuntimeException(e);
+                    }
+                }
+                break;
+            case NodeDataChanged:
+                if (watchedEvent.getPath().equals(previousNodePath)) {
+                    System.out.println("Previous leader data changed. maybe we have a new leader .");
+                    try {
+                        setData();
+                    } catch (InterruptedException | KeeperException e) {
+                        throw new RuntimeException(e);
+                    }
+                }
+                break;
+            default:
+                break;
+        }
+    }
+}
\ No newline at end of file

leader-elecation-zookeeper/src/main/resources/META-INF/MANIFEST.MF

+Manifest-Version: 1.0
+Main-Class: org.example.LeaderElection
+

leader-elecation-zookeeper/target/classes/META-INF/MANIFEST.MF

+Manifest-Version: 1.0
+Main-Class: org.example.LeaderElection
+