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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.cassandra.diag.store;
  
  import java.util.Map;
  import java.util.NavigableMap;
  
  import org.junit.Test;
  
  import org.apache.cassandra.diag.DiagnosticEvent;
  import org.apache.cassandra.diag.DiagnosticEventServiceTest.TestEvent1;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertSame;
  
  public class DiagnosticEventMemoryStoreTest
  {
      @Test
      public void testEmpty()
      {
          DiagnosticEventMemoryStore store = new DiagnosticEventMemoryStore();
          assertEquals(0, store.size());
          assertEquals(0, store.scan(0L, 10).size());
      }
  
      @Test
      public void testSingle()
      {
          DiagnosticEventMemoryStore store = new DiagnosticEventMemoryStore();
          store.store(new TestEvent1());
          assertEquals(1, store.size());
          assertEquals(1, store.scan(0L, 10).size());
      }
  
      @Test
      public void testIdentity()
      {
          DiagnosticEventMemoryStore store = new DiagnosticEventMemoryStore();
          TestEvent1 e1 = new TestEvent1();
          TestEvent1 e2 = new TestEvent1();
          TestEvent1 e3 = new TestEvent1();
  
          store.store(e1);
          store.store(e2);
          store.store(e3);
  
          assertEquals(3, store.size());
  
          NavigableMap<Long, DiagnosticEvent> res = store.scan(0L, 10);
          assertEquals(3, res.size());
  
          Map.Entry<Long, DiagnosticEvent> entry = res.pollFirstEntry();
          assertEquals(Long.valueOf(1), entry.getKey());
          assertSame(e1, entry.getValue());
  
          entry = res.pollFirstEntry();
          assertEquals(Long.valueOf(2), entry.getKey());
          assertSame(e2, entry.getValue());
  
          entry = res.pollFirstEntry();
          assertEquals(Long.valueOf(3), entry.getKey());
          assertSame(e3, entry.getValue());
      }
  
      @Test
      public void testLimit()
      {
          DiagnosticEventMemoryStore store = new DiagnosticEventMemoryStore();
  
          TestEvent1 e1 = new TestEvent1();
          TestEvent1 e2 = new TestEvent1();
          TestEvent1 e3 = new TestEvent1();
  
          store.store(e1);
          store.store(e2);
          store.store(e3);
  
          NavigableMap<Long, DiagnosticEvent> res = store.scan(0L, 2);
          assertEquals(2, res.size());
  
          Map.Entry<Long, DiagnosticEvent> entry = res.pollFirstEntry();
          assertEquals(Long.valueOf(1), entry.getKey());
          assertSame(e1, entry.getValue());
  
          entry = res.pollLastEntry();
          assertEquals(Long.valueOf(2), entry.getKey());
          assertSame(e2, entry.getValue());
      }
  
      @Test
      public void testSeek()
      {
          DiagnosticEventMemoryStore store = new DiagnosticEventMemoryStore();
  
          TestEvent1 e2 = new TestEvent1();
          TestEvent1 e3 = new TestEvent1();
  
          store.store(new TestEvent1());
          store.store(e2);
          store.store(e3);
          store.store(new TestEvent1());
          store.store(new TestEvent1());
          store.store(new TestEvent1());
  
          NavigableMap<Long, DiagnosticEvent> res = store.scan(2L, 2);
          assertEquals(2, res.size());
  
          Map.Entry<Long, DiagnosticEvent> entry = res.pollFirstEntry();
          assertEquals(Long.valueOf(2), entry.getKey());
          assertSame(e2, entry.getValue());
  
          entry = res.pollLastEntry();
          assertEquals(Long.valueOf(3), entry.getKey());
          assertSame(e3, entry.getValue());
      }
  
      @Test
      public void testMaxElements()
      {
          DiagnosticEventMemoryStore store = new DiagnosticEventMemoryStore();
          store.setMaxSize(3);
  
          store.store(new TestEvent1());
          store.store(new TestEvent1());
          store.store(new TestEvent1());
          TestEvent1 e2 = new TestEvent1(); // 4
          TestEvent1 e3 = new TestEvent1();
          store.store(e2);
          store.store(e3);
          store.store(new TestEvent1()); // 6
  
          assertEquals(3, store.size());
  
          NavigableMap<Long, DiagnosticEvent> res = store.scan(4L, 2);
          assertEquals(2, res.size());
  
          Map.Entry<Long, DiagnosticEvent> entry = res.pollFirstEntry();
          assertEquals(Long.valueOf(4), entry.getKey());
          assertSame(e2, entry.getValue());
  
          entry = res.pollFirstEntry();
          assertEquals(Long.valueOf(5), entry.getKey());
          assertSame(e3, entry.getValue());
  
          store.store(new TestEvent1()); // 7
          store.store(new TestEvent1());
          store.store(new TestEvent1());
  
          res = store.scan(4L, 2);
          assertEquals(2, res.size());
          assertEquals(Long.valueOf(7), res.pollFirstEntry().getKey());
          assertEquals(Long.valueOf(8), res.pollLastEntry().getKey());
      }
  }
  