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Leader Election Pattern (#923)

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* Fix issue #761: ThreadSafeDoubleCheckLocking.java: Instantiating by Reflection call will be successful if you do that firstly

* Create leader election module

* Create Interface of Instance and MessageManager

* Create implementations with token ring algorithm

* Change package structure.
Create basic message system.

* Implement heartbeat and heartbeat invoking message system

* Implement election message handler

* Add leader message handler

* Add main entry point

* Add comments

* Update README.md

* Fix checkstyle issue

* Add Unit Tests

* Add Unit Tests

* Add bully leader selection

* Change System.out to log print.
Add MIT license in each file.

* Add More java doc comments

* Add unit test

* Add unit tests
This commit is contained in:
Azureyjt
2019-10-08 23:29:59 +08:00
committed by Ilkka Seppälä
parent 41b8d80479
commit 90ea4506ca
22 changed files with 1719 additions and 0 deletions
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leader-election/src/main/java/com/iluwatar/leaderelection/bully/BullyApp.java
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/**
* The MIT License
* Copyright (c) 2014-2016 Ilkka Seppälä
* <p>
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
* <p>
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
* <p>
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package com.iluwatar.leaderelection.bully;
import com.iluwatar.leaderelection.Instance;
import com.iluwatar.leaderelection.Message;
import com.iluwatar.leaderelection.MessageManager;
import com.iluwatar.leaderelection.MessageType;
import java.util.HashMap;
import java.util.Map;
/**
* Example of how to use bully leader election. Initially 5 instances is created in the clould
* system, and the instance with ID 1 is set as leader. After the system is started stop the
* leader instance, and the new leader will be elected.
*/
public class BullyApp {
/**
* Program entry point
*/
public static void main(String[] args) {
Map<Integer, Instance> instanceMap = new HashMap<>();
MessageManager messageManager = new BullyMessageManager(instanceMap);
BullyInstance instance1 = new BullyInstance(messageManager, 1, 1);
BullyInstance instance2 = new BullyInstance(messageManager, 2, 1);
BullyInstance instance3 = new BullyInstance(messageManager, 3, 1);
BullyInstance instance4 = new BullyInstance(messageManager, 4, 1);
BullyInstance instance5 = new BullyInstance(messageManager, 5, 1);
instanceMap.put(1, instance1);
instanceMap.put(2, instance2);
instanceMap.put(3, instance3);
instanceMap.put(4, instance4);
instanceMap.put(5, instance5);
instance4.onMessage(new Message(MessageType.HEARTBEAT_INVOKE, ""));
Thread thread1 = new Thread(instance1);
Thread thread2 = new Thread(instance2);
Thread thread3 = new Thread(instance3);
Thread thread4 = new Thread(instance4);
Thread thread5 = new Thread(instance5);
thread1.start();
thread2.start();
thread3.start();
thread4.start();
thread5.start();
instance1.setAlive(false);
}
}