Curator counters

原创
2014/08/01 13:13
阅读数 163

这个比较好理解,分布式数字,类似AtomicInteger系列,Curator有2个实现:

第一个:

package curator.counters;

import org.apache.curator.RetryPolicy;
import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.CuratorFrameworkFactory;
import org.apache.curator.framework.recipes.shared.SharedCount;
import org.apache.curator.framework.recipes.shared.SharedCountListener;
import org.apache.curator.framework.recipes.shared.SharedCountReader;
import org.apache.curator.framework.state.ConnectionState;
import org.apache.curator.retry.ExponentialBackoffRetry;

public class SharedCounterDemo {

	public static void main(String[] args) throws Exception {
		RetryPolicy retryPolicy = new ExponentialBackoffRetry(1000, 3);
		final CuratorFramework client = CuratorFrameworkFactory.builder().connectString("127.0.0.1:2181").sessionTimeoutMs(5000).connectionTimeoutMs(10000).retryPolicy(retryPolicy).namespace("test").build();
		client.start();
		
		SharedCount count = new SharedCount(client,"/cut",0);
		count.start();
		
		count.addListener(new SharedCountListener(){

			@Override
			public void stateChanged(CuratorFramework client, ConnectionState newState) {
				
			}

			@Override
			public void countHasChanged(SharedCountReader sharedCount, int newCount) throws Exception {
				System.err.println("sharedCount.getCount : "+sharedCount.getCount());
				System.err.println(newCount);
			}});
		Thread.currentThread().sleep(5000);
		count.setCount(5);
		System.in.read();
	}

}

 

第二个:

package curator.counters;

import org.apache.curator.RetryPolicy;
import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.CuratorFrameworkFactory;
import org.apache.curator.framework.recipes.atomic.AtomicValue;
import org.apache.curator.framework.recipes.atomic.DistributedAtomicInteger;
import org.apache.curator.retry.ExponentialBackoffRetry;
import org.apache.curator.retry.RetryNTimes;

public class DistributedAtomicIntegerDemo {

	public static void main(String[] args) throws Exception {
		RetryPolicy retryPolicy = new ExponentialBackoffRetry(1000, 3);
		final CuratorFramework client = CuratorFrameworkFactory.builder().connectString("127.0.0.1:2181").sessionTimeoutMs(5000).connectionTimeoutMs(10000).retryPolicy(retryPolicy).namespace("test").build();
		client.start();

		DistributedAtomicInteger atomicInteger = new DistributedAtomicInteger(client,"/autlog",new RetryNTimes(32,1000));
		AtomicValue<Integer> rc = atomicInteger.add(8);  
		System.out.println("success:" + rc.succeeded() + ";before:" + rc.preValue() + ";after:" + rc.postValue());
		System.in.read();
	}

}

 

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