curator-master/curator-x-discovery/src/test/java/org/apache/curator/x/discovery/ServiceCacheLeakTester.java
/*
 * 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 org.apache.curator.x.discovery;

import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.CuratorFrameworkFactory;
import org.apache.curator.retry.RetryOneTime;
import org.apache.curator.test.TestingServer;
import org.apache.curator.test.compatibility.CuratorTestBase;
import org.apache.curator.utils.CloseableUtils;
import org.apache.curator.x.discovery.strategies.RandomStrategy;
import org.junit.jupiter.api.Tag;

@Tag(CuratorTestBase.zk35TestCompatibilityGroup)
public class ServiceCacheLeakTester {
    public static void main(String[] args) throws Exception {
        TestingServer testingServer = new TestingServer();

        final CuratorFramework curatorFramework =
                CuratorFrameworkFactory.newClient(testingServer.getConnectString(), new RetryOneTime(1));
        try {
            curatorFramework.start();

            doWork(curatorFramework);
            System.gc();

            System.out.println("Done - get dump");
            Thread.currentThread().join();
        } finally {
            CloseableUtils.closeQuietly(curatorFramework);
            CloseableUtils.closeQuietly(testingServer);
        }
    }

    private static void doWork(CuratorFramework curatorFramework) throws Exception {
        ServiceInstance<Void> thisInstance =
                ServiceInstance.<Void>builder().name("myservice").build();
        final ServiceDiscovery<Void> serviceDiscovery = ServiceDiscoveryBuilder.builder(Void.class)
                .client(curatorFramework.usingNamespace("dev"))
                .basePath("/instances")
                .thisInstance(thisInstance)
                .build();
        serviceDiscovery.start();

        for (int i = 0; i < 100000; i++) {
            final ServiceProvider<Void> s = serviceProvider(serviceDiscovery, "myservice");
            s.start();
            try {
                s.getInstance().buildUriSpec();
            } finally {
                s.close();
            }
        }
    }

    private static ServiceProvider<Void> serviceProvider(ServiceDiscovery<Void> serviceDiscovery, String name)
            throws Exception {
        return serviceDiscovery
                .serviceProviderBuilder()
                .serviceName(name)
                .providerStrategy(new RandomStrategy<Void>())
                .build();
    }
}
