sleet.utils.zookeeper.TestInstanceIdManagerZooKeeper.java Source code

Introduction

Here is the source code for sleet.utils.zookeeper.TestInstanceIdManagerZooKeeper.java

Source

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package sleet.utils.zookeeper;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;

import org.apache.zookeeper.KeeperException;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.ZooKeeper;

public class TestInstanceIdManagerZooKeeper {
    public static void main(String[] args) throws IOException, InterruptedException, KeeperException {
        ZkMiniCluster cluster = new ZkMiniCluster();
        File temp = File.createTempFile("instanceidmanager", "");
        temp.delete();
        temp.mkdir();
        System.out.println("zk temp path: " + temp.getAbsolutePath());
        cluster.startZooKeeper(temp.getAbsolutePath());
        String zkconn = cluster.getZkConnectionString();
        zkconn = "localhost:" + zkconn.substring(zkconn.lastIndexOf(':') + 1);
        System.out.println("ZK connection string: " + zkconn);
        ZooKeeper zooKeeper = new ZooKeeper(zkconn, 10000, new Watcher() {
            @Override
            public void process(WatchedEvent event) {

            }
        });
        String path = "/id-manager";
        try {
            rmr(zooKeeper, path);
        } catch (Exception e) {
            // ignore
        }
        final InstanceIdManagerZooKeeper idManagerZooKeeper = new InstanceIdManagerZooKeeper(zooKeeper, path, 10);
        {
            int id1 = idManagerZooKeeper.tryToGetId(1000L);
            System.out.println(id1);
            idManagerZooKeeper.releaseId(id1);
        }
        {
            int id1 = idManagerZooKeeper.tryToGetId(1000L);
            System.out.println(id1);
            idManagerZooKeeper.releaseId(id1);
        }
        {
            int[] ids = new int[12];
            for (int i = 0; i < ids.length; i++) {
                ids[i] = idManagerZooKeeper.tryToGetId(1000L);
            }

            for (int i = 0; i < ids.length; i++) {
                System.out.println(ids[i]);
            }

            for (int i = 0; i < ids.length; i++) {
                idManagerZooKeeper.releaseId(ids[i]);
            }
        }

        {
            ExecutorService service = Executors.newCachedThreadPool();
            Random random = new Random();
            final AtomicInteger count = new AtomicInteger();
            int maxWorkers = 100;
            List<Future<Void>> futures = new ArrayList<Future<Void>>();
            for (int i = 0; i < maxWorkers; i++) {
                final int secondToWork = random.nextInt(2) + 1;
                final int index = i;
                futures.add(service.submit(new Callable<Void>() {
                    @Override
                    public Void call() throws Exception {
                        int id;
                        int attempts = 0;
                        do {
                            if (attempts > 0) {
                                Thread.sleep(100);
                            }
                            id = idManagerZooKeeper.tryToGetId(1000L);
                            attempts++;
                        } while (id < 0);
                        try {
                            System.out.println("[" + index + "] Working for [" + secondToWork
                                    + "] seconds with id [" + id + "]");
                            Thread.sleep(TimeUnit.SECONDS.toMillis(secondToWork));
                        } finally {
                            System.out.println("[" + index + "] Releasing with id [" + id + "]");
                            idManagerZooKeeper.releaseId(id);
                            count.incrementAndGet();
                        }
                        return null;
                    }
                }));
            }
            for (Future<Void> future : futures) {
                try {
                    future.get();
                } catch (ExecutionException e) {
                    Throwable cause = e.getCause();
                    cause.printStackTrace();
                }
            }
            while (count.get() < maxWorkers) {
                System.out.println(count.get() + " " + maxWorkers);
                Thread.sleep(TimeUnit.SECONDS.toMillis(1));
            }
            service.shutdown();
            service.awaitTermination(1, TimeUnit.DAYS);
        }

        zooKeeper.close();
        cluster.shutdownZooKeeper();
    }

    private static void rmr(ZooKeeper zooKeeper, String path) throws KeeperException, InterruptedException {
        List<String> children = zooKeeper.getChildren(path, false);
        for (String s : children) {
            rmr(zooKeeper, path + "/" + s);
        }
        zooKeeper.delete(path, -1);
    }
}