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https://github.com/tiennm99/java-design-patterns.git
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Zhang WH
67edeb806d
* Java 11 support: lazy-loading pattern * Java 11 support: layers pattern * Java 11 support: leader-election/lazy-loading patterns
77 lines
2.8 KiB
Java
77 lines
2.8 KiB
Java
/*
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* The MIT License
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* Copyright © 2014-2019 Ilkka Seppälä
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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package com.iluwatar.leaderelection.bully;
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import com.iluwatar.leaderelection.Instance;
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import com.iluwatar.leaderelection.Message;
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import com.iluwatar.leaderelection.MessageManager;
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import com.iluwatar.leaderelection.MessageType;
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import java.util.HashMap;
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import java.util.Map;
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/**
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* Example of how to use bully leader election. Initially 5 instances is created in the clould
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* system, and the instance with ID 1 is set as leader. After the system is started stop the leader
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* instance, and the new leader will be elected.
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*/
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public class BullyApp {
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/**
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* Program entry point.
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*/
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public static void main(String[] args) {
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Map<Integer, Instance> instanceMap = new HashMap<>();
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var messageManager = new BullyMessageManager(instanceMap);
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var instance1 = new BullyInstance(messageManager, 1, 1);
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var instance2 = new BullyInstance(messageManager, 2, 1);
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var instance3 = new BullyInstance(messageManager, 3, 1);
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var instance4 = new BullyInstance(messageManager, 4, 1);
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var instance5 = new BullyInstance(messageManager, 5, 1);
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instanceMap.put(1, instance1);
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instanceMap.put(2, instance2);
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instanceMap.put(3, instance3);
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instanceMap.put(4, instance4);
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instanceMap.put(5, instance5);
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instance4.onMessage(new Message(MessageType.HEARTBEAT_INVOKE, ""));
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final var thread1 = new Thread(instance1);
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final var thread2 = new Thread(instance2);
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final var thread3 = new Thread(instance3);
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final var thread4 = new Thread(instance4);
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final var thread5 = new Thread(instance5);
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thread1.start();
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thread2.start();
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thread3.start();
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thread4.start();
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thread5.start();
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instance1.setAlive(false);
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}
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}
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