/*
 * Copyright (c) 2008-2017, Hazelcast, Inc. All Rights Reserved.
 *
 * Licensed 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 classloading;

import com.hazelcast.core.Hazelcast;
import com.hazelcast.core.HazelcastInstance;
import com.hazelcast.logging.ILogger;
import com.hazelcast.logging.Logger;
import com.hazelcast.test.HazelcastSerialClassRunner;
import com.hazelcast.test.HazelcastTestSupport;
import com.hazelcast.test.annotation.QuickTest;
import org.junit.Test;
import org.junit.experimental.categories.Category;
import org.junit.runner.RunWith;

import java.util.Set;

@RunWith(HazelcastSerialClassRunner.class)
@Category(QuickTest.class)
public class ThreadLeakTest extends HazelcastTestSupport {

    protected static final ILogger LOGGER = Logger.getLogger(ThreadLeakTest.class);

    @Test
    public void testThreadLeak() {
        Set<Thread> threads = Thread.getAllStackTraces().keySet();

        HazelcastInstance hz = Hazelcast.newHazelcastInstance();
        hz.shutdown();

        assertHazelcastThreadShutdown(threads);
    }

    public static void assertHazelcastThreadShutdown(Set<Thread> oldThreads) {
        Set<Thread> diff = Thread.getAllStackTraces().keySet();
        diff.removeAll(oldThreads);
        if (diff.isEmpty()) {
            return;
        }

        LOGGER.warning("There are still Hazelcast threads running after shutdown: " + diff);
        for (Thread thread : diff) {
            if (!thread.isInterrupted() && thread.getState() != Thread.State.TERMINATED) {
                LOGGER.warning("Thread is not interrupted and not TERMINATED: " + thread);
            }
        }

        Thread[] threads = new Thread[diff.size()];
        diff.toArray(threads);

        assertJoinable(threads);
    }
}