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   * 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.activemq.artemis.tests.integration.client;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.fail;
  
  import java.util.concurrent.atomic.AtomicInteger;
  
  import org.apache.activemq.artemis.api.core.ActiveMQException;
  import org.apache.activemq.artemis.api.core.ActiveMQQueueExistsException;
  import org.apache.activemq.artemis.api.core.QueueConfiguration;
  import org.apache.activemq.artemis.api.core.SimpleString;
  import org.apache.activemq.artemis.api.core.client.ClientSession;
  import org.apache.activemq.artemis.api.core.client.ClientSessionFactory;
  import org.apache.activemq.artemis.api.core.client.ServerLocator;
  import org.apache.activemq.artemis.core.server.ActiveMQServer;
  import org.apache.activemq.artemis.core.server.ActiveMQServers;
  import org.apache.activemq.artemis.tests.util.ActiveMQTestBase;
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  
  public class CreateQueueIdempotentTest extends ActiveMQTestBase {
  
     private ActiveMQServer server;
  
     @Override
     @BeforeEach
     public void setUp() throws Exception {
        super.setUp();
        server = addServer(ActiveMQServers.newActiveMQServer(createDefaultInVMConfig(), true));
        server.start();
     }
  
     @Test
     public void testSequentialCreateQueueIdempotency() throws Exception {
        final SimpleString QUEUE = SimpleString.of("SequentialCreateQueueIdempotency");
  
        ServerLocator locator = createInVMNonHALocator();
  
        ClientSessionFactory sf = addSessionFactory(createSessionFactory(locator));
  
        ClientSession session = sf.createSession(false, true, true);
  
        session.createQueue(QueueConfiguration.of(QUEUE));
  
        try {
           session.createQueue(QueueConfiguration.of(QUEUE));
           fail("Expected exception, queue already exists");
        } catch (ActiveMQQueueExistsException qee) {
           //ok
        } catch (ActiveMQException e) {
           fail("Invalid Exception type:" + e.getType());
        }
     }
  
     @Test
     public void testConcurrentCreateQueueIdempotency() throws Exception {
        final String QUEUE = "ConcurrentCreateQueueIdempotency";
        AtomicInteger queuesCreated = new AtomicInteger(0);
        AtomicInteger failedAttempts = new AtomicInteger(0);
  
        final int NUM_THREADS = 5;
  
        QueueCreator[] queueCreators = new QueueCreator[NUM_THREADS];
  
        for (int i = 0; i < NUM_THREADS; i++) {
           QueueCreator queueCreator = new QueueCreator(QUEUE, queuesCreated, failedAttempts);
           queueCreators[i] = queueCreator;
        }
  
        for (int i = 0; i < NUM_THREADS; i++) {
           queueCreators[i].start();
        }
  
        for (int i = 0; i < NUM_THREADS; i++) {
           queueCreators[i].join();
        }
  
        server.stop();
  
        // re-starting the server appears to be an unreliable guide
        server.start();
  
        assertEquals(1, queuesCreated.intValue());
        assertEquals(NUM_THREADS - 1, failedAttempts.intValue());
     }
  
     class QueueCreator extends Thread {
  
        private String queueName = null;
        private AtomicInteger queuesCreated = null;
        private AtomicInteger failedAttempts = null;
  
        QueueCreator(String queueName, AtomicInteger queuesCreated, AtomicInteger failedAttempts) {
           this.queueName = queueName;
           this.queuesCreated = queuesCreated;
           this.failedAttempts = failedAttempts;
        }
  
        @Override
        public void run() {
           ServerLocator locator = null;
           ClientSession session = null;
  
           try {
              locator = createInVMNonHALocator();
              ClientSessionFactory sf = createSessionFactory(locator);
              session = sf.createSession(false, true, true);
              final SimpleString QUEUE = SimpleString.of(queueName);
              session.createQueue(QueueConfiguration.of(QUEUE));
              queuesCreated.incrementAndGet();
           } catch (ActiveMQQueueExistsException qne) {
              failedAttempts.incrementAndGet();
           } catch (Exception e) {
              e.printStackTrace();
           } finally {
              if (locator != null) {
                 locator.close();
              }
              if (session != null) {
                 try {
                    session.close();
                 } catch (ActiveMQException e) {
                    e.printStackTrace();
                 }
              }
           }
        }
     }
  }
  