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.io.EOFException;
  import java.io.IOException;
  import java.nio.ByteBuffer;
  import java.util.Arrays;
  import java.util.Random;
  
  import com.google.common.primitives.Ints;
  import org.junit.Test;
  
  import org.apache.cassandra.utils.ByteBufferUtil;
  
  import static org.apache.cassandra.utils.Clock.Global.nanoTime;
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertTrue;
  
  public class FileSegmentInputStreamTest
  {
      private ByteBuffer allocateBuffer(int size)
      {
          ByteBuffer ret = ByteBuffer.allocate(Ints.checkedCast(size));
          long seed = nanoTime();
          //seed = 365238103404423L;
          System.out.println("Seed " + seed);
  
          new Random(seed).nextBytes(ret.array());
          return ret;
      }
  
      @Test
      public void testRead() throws IOException
      {
          testRead(0, 4096, 1024);
          testRead(1024, 4096, 1024);
          testRead(4096, 4096, 1024);
      }
  
      private void testRead(int offset, int size, int checkInterval) throws IOException
      {
          final ByteBuffer buffer = allocateBuffer(size);
          final String path = buffer.toString();
  
          FileSegmentInputStream reader = new FileSegmentInputStream(buffer.duplicate(), path, offset);
          assertEquals(path, reader.getPath());
  
          for (int i = offset; i < (size + offset); i += checkInterval)
          {
              reader.seek(i);
              assertFalse(reader.isEOF());
              assertEquals(i, reader.getFilePointer());
  
              buffer.position(i - offset);
  
              int remaining = buffer.remaining();
              assertEquals(remaining, reader.bytesRemaining());
              byte[] expected = new byte[buffer.remaining()];
              buffer.get(expected);
              assertTrue(Arrays.equals(expected, ByteBufferUtil.read(reader, remaining).array()));
  
              assertTrue(reader.isEOF());
              assertEquals(0, reader.bytesRemaining());
              assertEquals(buffer.capacity() + offset, reader.getFilePointer());
          }
  
          reader.close();
          reader.close();
      }
  
      @Test(expected = UnsupportedOperationException.class)
      public void testMarkNotSupported() throws Exception
      {
          try (FileSegmentInputStream reader = new FileSegmentInputStream(allocateBuffer(1024), "", 0))
          {
              assertFalse(reader.markSupported());
              assertEquals(0, reader.bytesPastMark(null));
              reader.mark();
          }
      }
  
      @Test(expected = UnsupportedOperationException.class)
      public void testResetNotSupported() throws Exception
      {
          try (FileSegmentInputStream reader = new FileSegmentInputStream(allocateBuffer(1024), "", 0))
          {
              reader.reset(null);
          }
      }
  
      @Test(expected = IllegalArgumentException.class)
      public void testSeekNegative() throws Exception
      {
          try (FileSegmentInputStream reader = new FileSegmentInputStream(allocateBuffer(1024), "", 0))
          {
              reader.seek(-1);
          }
      }
  
      @Test(expected = IllegalArgumentException.class)
      public void testSeekBeforeOffset() throws Exception
      {
          try (FileSegmentInputStream reader = new FileSegmentInputStream(allocateBuffer(1024), "", 1024))
          {
              reader.seek(1023);
          }
      }
  
      @Test(expected = IllegalArgumentException.class)
      public void testSeekPastLength() throws Exception
      {
          try (FileSegmentInputStream reader = new FileSegmentInputStream(allocateBuffer(1024), "", 1024))
          {
              reader.seek(2049);
          }
      }
  
      @Test(expected = EOFException.class)
      public void testReadBytesTooMany() throws Exception
      {
          try (FileSegmentInputStream reader = new FileSegmentInputStream(allocateBuffer(1024), "", 1024))
          {
              ByteBufferUtil.read(reader, 2049);
          }
      }
  }
  