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.unit.core.postoffice.impl;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.List;
  
  import org.apache.activemq.artemis.api.core.SimpleString;
  import org.apache.activemq.artemis.core.server.Queue;
  import org.apache.activemq.artemis.core.server.impl.ScaleDownHandler;
  import org.apache.activemq.artemis.tests.unit.core.postoffice.impl.fakes.FakeQueue;
  import org.junit.jupiter.api.Test;
  
  public class QueueComparatorTest {
  
     @Test
     public void testQueueSorting() {
        FakeQueue queue1 = new FakeQueue(SimpleString.of("1"));
        queue1.setMessageCount(1);
        FakeQueue queue2 = new FakeQueue(SimpleString.of("2"));
        queue2.setMessageCount(2);
        FakeQueue queue3 = new FakeQueue(SimpleString.of("3"));
        queue3.setMessageCount(3);
  
        List<Queue> queues = new ArrayList<>();
        queues.add(queue1);
        queues.add(queue2);
        queues.add(queue3);
  
        assertEquals(1, queues.get(0).getMessageCount());
        assertEquals(2, queues.get(1).getMessageCount());
        assertEquals(3, queues.get(2).getMessageCount());
  
        Collections.sort(queues, new ScaleDownHandler.OrderQueueByNumberOfReferencesComparator());
  
        assertEquals(3, queues.get(0).getMessageCount());
        assertEquals(2, queues.get(1).getMessageCount());
        assertEquals(1, queues.get(2).getMessageCount());
     }
  }
  