theone

A tool to make a process having only one instance in a cluster

~~不再更新，请使用Curator的LeaderSelector替代~~

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Requirement

• Zookeeper
• Java 8

Installation

<dependency>
  <groupId>com.jiuxian</groupId>
  <artifactId>theone</artifactId>
  <version>1.4.1-RELEASE</version>
</dependency>

Key concept

• Process
• 进程
• Competitive
• 进程的可竞争性实现，用于保证进程在集群中只有惟一一份实例在运行

Quick Start

Implement a simple process

public class SimpleProcess implements Process {
    
    @Override
	public void run() {
		System.out.println("This is a process example.");
	}

	@Override
	public void close() throws Exception {
		System.out.println("Close resources");
	}

}

Wrap the process with UniqueProcess

	String zks = "localhost";
	Process process = new SimpleProcess();
	Competitive competitive = new ZookeeperCompetitiveImpl(zks, "group1");
	CompetitiveProcess guard = new CompetitiveProcess(process, competitive);
	guard.run();