content: /*
   * 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 java.util.HashMap;
  import java.util.concurrent.atomic.AtomicInteger;
  
  import org.apache.activemq.artemis.api.core.QueueConfiguration;
  import org.apache.activemq.artemis.api.core.RoutingType;
  import org.apache.activemq.artemis.api.core.SimpleString;
  import org.apache.activemq.artemis.api.core.client.ClientConsumer;
  import org.apache.activemq.artemis.api.core.client.ClientMessage;
  import org.apache.activemq.artemis.api.core.client.ClientProducer;
  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.config.Configuration;
  import org.apache.activemq.artemis.core.server.ActiveMQServer;
  import org.apache.activemq.artemis.core.server.Queue;
  import org.apache.activemq.artemis.tests.util.ActiveMQTestBase;
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  
  /**
   * The delete queue was resetting some fields on the Queue what would eventually turn a NPE. this test would eventually
   * fail without the fix but it was a rare event as in most of the time the NPE happened during depaging what let the
   * server to recover itself on the next depage. To verify a fix on this test against the previous version of QueueImpl
   * look for NPEs on System.err
   */
  public class ConcurrentCreateDeleteProduceTest extends ActiveMQTestBase {
  
     volatile boolean running = true;
  
     private final SimpleString ADDRESS = SimpleString.of("ADQUEUE");
  
     AtomicInteger sequence = new AtomicInteger(0);
     private ActiveMQServer server;
     private ServerLocator locator;
  
     private static final int PAGE_MAX = 100 * 1024;
  
     private static final int PAGE_SIZE = 10 * 1024;
  
     @Override
     @BeforeEach
     public void setUp() throws Exception {
        super.setUp();
  
        Configuration config = createDefaultInVMConfig().setJournalSyncNonTransactional(false).setJournalSyncTransactional(false);
  
        server = createServer(true, config, PAGE_SIZE, PAGE_MAX, new HashMap<>());
        server.start();
        locator = createNonHALocator(false).setBlockOnDurableSend(false).setBlockOnAcknowledge(true);
     }
  
     @Test
     public void testConcurrentProduceCreateAndDelete() throws Throwable {
        locator.setBlockOnDurableSend(false).setBlockOnNonDurableSend(false);
        ClientSessionFactory factory = locator.createSessionFactory();
        ClientSession session = factory.createSession(true, true);
        ClientProducer producer = session.createProducer(ADDRESS);
  
        // just to make it page forever
        Queue serverQueue = server.createQueue(QueueConfiguration.of("everPage").setAddress(ADDRESS).setRoutingType(RoutingType.ANYCAST));
        serverQueue.getPageSubscription().getPagingStore().startPaging();
  
        Consumer[] consumers = new Consumer[10];
  
        for (int i = 0; i < consumers.length; i++) {
           consumers[i] = new Consumer();
           consumers[i].start();
        }
  
        for (int i = 0; i < 1500 && running; i++) {
           producer.send(session.createMessage(true));
           //Thread.sleep(10);
        }
  
        session.close();
  
        running = false;
  
        for (Consumer consumer : consumers) {
           consumer.join();
           if (consumer.ex != null) {
              throw consumer.ex;
           }
        }
  
     }
  
     class Consumer extends Thread {
  
        volatile Throwable ex;
  
        @Override
        public void run() {
           ClientSessionFactory factory;
           ClientSession session;
           try {
              factory = locator.createSessionFactory();
              session = factory.createSession(false, false);
              session.start();
  
              int msgcount = 0;
  
              for (int i = 0; i < 100 && running; i++) {
                 SimpleString queueName = ADDRESS.concat("_" + sequence.incrementAndGet());
                 session.createQueue(QueueConfiguration.of(queueName).setAddress(ADDRESS));
                 ClientConsumer consumer = session.createConsumer(queueName);
                 while (running) {
                    ClientMessage msg = consumer.receive(500);
                    if (msg == null) {
                       if (running) continue;
                       else break;
                    }
                    if (msgcount++ == 500) {
                       msgcount = 0;
                       break;
                    }
                 }
                 consumer.close();
                 session.commit();
                 session.deleteQueue(queueName);
              }
              session.close();
           } catch (Throwable e) {
              this.ex = e;
              e.printStackTrace();
              running = false;
           }
        }
  
     }
  
  }
  