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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,
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   * See the License for the specific language governing permissions and
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  package org.apache.activemq.artemis.tests.integration.mqtt;
  
  import java.util.HashMap;
  import java.util.Map;
  import java.util.concurrent.TimeUnit;
  
  import org.apache.activemq.artemis.api.core.ActiveMQException;
  import org.apache.activemq.artemis.api.core.TransportConfiguration;
  import org.apache.activemq.artemis.core.postoffice.Binding;
  import org.apache.activemq.artemis.core.protocol.mqtt.MQTTConnection;
  import org.apache.activemq.artemis.core.remoting.impl.netty.NettyAcceptor;
  import org.apache.activemq.artemis.core.remoting.impl.netty.TransportConstants;
  import org.apache.activemq.artemis.core.server.plugin.ActiveMQServerBindingPlugin;
  import org.apache.activemq.artemis.spi.core.protocol.RemotingConnection;
  import org.apache.activemq.artemis.utils.Wait;
  import org.fusesource.mqtt.client.BlockingConnection;
  import org.fusesource.mqtt.client.MQTT;
  import org.fusesource.mqtt.client.QoS;
  import org.fusesource.mqtt.client.Topic;
  import org.junit.jupiter.api.Test;
  import org.junit.jupiter.api.Timeout;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertInstanceOf;
  import static org.junit.jupiter.api.Assertions.fail;
  
  public class MQTTConnnectionCleanupTest extends MQTTTestSupport {
  
     @Override
     protected void addMQTTConnector() {
  
        Map<String, Object> params = new HashMap<>();
        params.put(TransportConstants.PORT_PROP_NAME, "" + port);
        params.put(TransportConstants.PROTOCOLS_PROP_NAME, "MQTT");
        params.put(TransportConstants.CONNECTIONS_ALLOWED, 1);
        params.put(TransportConstants.HOST_PROP_NAME, "localhost");
  
        TransportConfiguration mqtt = new TransportConfiguration(NETTY_ACCEPTOR_FACTORY, params, "MQTT");
  
        server.getConfiguration().addAcceptorConfiguration(mqtt);
     }
  
     @Test
     @Timeout(30)
     public void testBadClient() throws Exception {
        MQTT mqtt = createMQTTConnection();
        mqtt.setClientId("");
        mqtt.setCleanSession(true);
        BlockingConnection connection = mqtt.blockingConnection();
        connection.connect();
  
        try {
           connection = mqtt.blockingConnection();
           connection.connect();
           fail("second connection shouldn't be allowed");
        } catch (Exception e) {
           //ignore.
        }
  
        NettyAcceptor acceptor = (NettyAcceptor) server.getRemotingService().getAcceptor("MQTT");
        assertEquals(1, acceptor.getConnections().size());
  
        //now simulate a bad client by manually fail the server connection
        RemotingConnection conn = server.getRemotingService().getConnections().iterator().next();
  
        assertInstanceOf(MQTTConnection.class, conn);
  
        conn.fail(new ActiveMQException("testBadClient"));
  
        Wait.assertEquals(0, ()->acceptor.getConnections().size());
  
        //another connection should be ok
        connection = mqtt.blockingConnection();
        connection.connect();
        connection.disconnect();
     }
  
  
     @Test
     @Timeout(30)
     public void testSlowSubscribeWontBlockKeepAlive() throws Exception {
        MQTT mqtt = createMQTTConnection();
        mqtt.setClientId("");
        mqtt.setKeepAlive((short) 1);
  
        mqtt.setCleanSession(true);
        BlockingConnection connection = mqtt.blockingConnection();
        connection.connect();
  
        NettyAcceptor acceptor = (NettyAcceptor) server.getRemotingService().getAcceptor("MQTT");
        assertEquals(1, acceptor.getConnections().size());
  
        server.getConfiguration().getBrokerBindingPlugins().add(new ActiveMQServerBindingPlugin() {
           @Override
           public void beforeAddBinding(Binding binding) throws ActiveMQException {
              // take a little nap
              try {
                 TimeUnit.SECONDS.sleep(3);
              } catch (Exception ok) {
              }
           }
        });
  
        // this should take a while...but should succeed.
        connection.subscribe(new Topic[]{new Topic("T.x", QoS.AT_LEAST_ONCE)});
        assertEquals(1, acceptor.getConnections().size());
  
        connection.disconnect();
     }
  
  }
  