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 static org.assertj.core.api.Assertions.assertThatExceptionOfType;
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertNotNull;
  import static org.junit.Assert.assertTrue;
  
  public class WrappingRebuffererTest
  {
      @Test
      public void testRebufferRelease()
      {
          TestRebufferer mock = new TestRebufferer();
          try (WrappingRebufferer rebufferer = new WrappingRebufferer(mock)
          {
          })
          {
              Rebufferer.BufferHolder ret = rebufferer.rebuffer(0);
              assertNotNull(ret);
              assertEquals(mock.buffer(), ret.buffer());
              assertEquals(mock.offset(), ret.offset());
  
              ret.release();
              assertTrue(mock.released);
          }
      }
  
      @Test
      public void testRebufferReleaseFailingContract()
      {
          TestRebufferer mock = new TestRebufferer();
          try (WrappingRebufferer rebufferer = new WrappingRebufferer(mock)
          {
          })
          {
              Rebufferer.BufferHolder ret1 = rebufferer.rebuffer(0);
              assertNotNull(ret1);
              assertEquals(mock.buffer(), ret1.buffer());
              assertEquals(mock.offset(), ret1.offset());
  
              assertThatExceptionOfType(AssertionError.class).isThrownBy(() -> rebufferer.rebuffer(1));
              ret1.release();
  
              assertTrue(mock.released);
              assertThatExceptionOfType(AssertionError.class).isThrownBy(ret1::buffer);
              assertThatExceptionOfType(AssertionError.class).isThrownBy(ret1::offset);
          }
      }
  
      @Test
      public void testRebufferReleaseFailingContractWhenClosing()
      {
          assertThatExceptionOfType(AssertionError.class).isThrownBy(() -> {
              TestRebufferer mock = new TestRebufferer();
              try (WrappingRebufferer rebufferer = new WrappingRebufferer(mock)
              {
              })
              {
                  Rebufferer.BufferHolder ret1 = rebufferer.rebuffer(0);
                  assertNotNull(ret1);
                  assertEquals(mock.buffer(), ret1.buffer());
                  assertEquals(mock.offset(), ret1.offset());
              }
          });
      }
  
  
      private static class TestRebufferer implements Rebufferer, Rebufferer.BufferHolder
      {
          final ByteBuffer buffer;
          boolean released;
          long offset;
  
          TestRebufferer()
          {
              this.buffer = ByteBuffer.allocate(0);
              this.released = false;
              this.offset = 0;
          }
  
          @Override
          public ChannelProxy channel()
          {
              return null;
          }
  
          @Override
          public ByteBuffer buffer()
          {
              return buffer;
          }
  
          public long fileLength()
          {
              return buffer.remaining();
          }
  
          public double getCrcCheckChance()
          {
              return 0;
          }
  
          public BufferHolder rebuffer(long position)
          {
              offset = position;
              return this;
          }
  
          public long offset()
          {
              return offset;
          }
  
          public void release()
          {
              released = true;
          }
  
          public long adjustExternal(long position)
          {
              return position;
          }
  
          public long adjustInternal(long position)
          {
              return position;
          }
  
          public void close()
          {
              // nothing
          }
  
          public void closeReader()
          {
              // nothing
          }
      }
  }