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.cassandra.io.util;
  
  import java.nio.ByteBuffer;
  
  import org.junit.Test;
  
  import org.mockito.Mockito;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertSame;
  import static org.mockito.ArgumentMatchers.anyLong;
  import static org.mockito.Mockito.reset;
  import static org.mockito.Mockito.verify;
  import static org.mockito.Mockito.when;
  
  public class TailOverridingRebuffererTest
  {
      ByteBuffer head = ByteBuffer.wrap(new byte[]{ 1, 2, 3, 4, 5, 6, 7, 8 });
      ByteBuffer tail = ByteBuffer.wrap(new byte[]{ 9, 10 });
  
      Rebufferer r = Mockito.mock(Rebufferer.class);
      Rebufferer.BufferHolder bh = Mockito.mock(Rebufferer.BufferHolder.class);
  
      public void before()
      {
          reset(r, bh);
      }
  
      @Test
      public void testAccessLeftToTailFully()
      {
          when(r.rebuffer(anyLong())).thenReturn(bh);
          when(bh.buffer()).thenReturn(head.duplicate());
          when(bh.offset()).thenReturn(0L);
          Rebufferer tor = new TailOverridingRebufferer(r, 8, tail.duplicate());
  
          for (int i = 0; i < 8; i++)
          {
              Rebufferer.BufferHolder bh = tor.rebuffer(i);
              assertEquals(head, bh.buffer());
              bh.release();
          }
  
          assertEquals(10, tor.fileLength());
      }
  
      @Test
      public void testAccessLeftToTailPartial()
      {
          when(r.rebuffer(anyLong())).thenReturn(bh);
          when(bh.buffer()).thenReturn(head.duplicate());
          when(bh.offset()).thenReturn(2L);
          Rebufferer tor = new TailOverridingRebufferer(r, 8, tail.duplicate());
  
          for (int i = 2; i < 8; i++)
          {
              Rebufferer.BufferHolder bh = tor.rebuffer(i);
              assertEquals(head.limit(6), bh.buffer());
              bh.release();
          }
  
          assertEquals(10, tor.fileLength());
      }
  
      @Test
      public void testAccessRightToTail()
      {
          when(r.rebuffer(anyLong())).thenReturn(bh);
          when(bh.buffer()).thenReturn(head.duplicate());
          when(bh.offset()).thenReturn(0L);
          Rebufferer tor = new TailOverridingRebufferer(r, 8, tail.duplicate());
  
          for (int i = 8; i < 10; i++)
          {
              Rebufferer.BufferHolder bh = tor.rebuffer(i);
              assertEquals(tail, bh.buffer());
              bh.release();
          }
  
          assertEquals(10, tor.fileLength());
      }
  
      @Test
      public void testOtherMethods()
      {
          Rebufferer tor = new TailOverridingRebufferer(r, 8, tail.duplicate());
  
          File tmp = FileUtils.createTempFile("fakeChannelProxy", "");
          try (ChannelProxy channelProxy = new ChannelProxy(tmp))
          {
              when(r.channel()).thenReturn(channelProxy);
              assertSame(channelProxy, tor.channel());
              verify(r).channel();
              reset(r);
          }
  
          tor.closeReader();
          verify(r).closeReader();
          reset(r);
  
          tor.close();
          verify(r).close();
          reset(r);
  
          when(r.getCrcCheckChance()).thenReturn(0.123d);
          assertEquals(0.123d, tor.getCrcCheckChance(), 0);
          verify(r).getCrcCheckChance();
          reset(r);
      }
  }