/**
    * 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.hadoop.hbase.util;
  
  import static org.junit.Assert.assertEquals;
  
  import java.io.IOException;
  import java.nio.ByteBuffer;
  
  import org.apache.hadoop.hbase.testclassification.MiscTests;
  import org.apache.hadoop.hbase.testclassification.SmallTests;
  import org.junit.Test;
  import org.junit.experimental.categories.Category;
  
  @Category({MiscTests.class, SmallTests.class})
  public class TestByteBufferArray {
  
    @Test
    public void testByteBufferCreation() throws Exception {
      int capacity = 470 * 1021 * 1023;
      ByteBufferAllocator allocator = new ByteBufferAllocator() {
        @Override
        public ByteBuffer allocate(long size, boolean directByteBuffer) throws IOException {
          if (directByteBuffer) {
            return ByteBuffer.allocateDirect((int) size);
          } else {
            return ByteBuffer.allocate((int) size);
          }
        }
      };
      ByteBufferArray array = new ByteBufferArray(capacity, false, allocator);
      assertEquals(119, array.buffers.length);
      for (int i = 0; i < array.buffers.length; i++) {
        if (i == array.buffers.length - 1) {
          assertEquals(array.buffers[i].capacity(), 0);
        } else {
          assertEquals(array.buffers[i].capacity(), ByteBufferArray.DEFAULT_BUFFER_SIZE);
        }
      }
    }
  
    @Test
    public void testByteBufferCreation1() throws Exception {
      ByteBufferAllocator allocator = new ByteBufferAllocator() {
        @Override
        public ByteBuffer allocate(long size, boolean directByteBuffer) throws IOException {
          if (directByteBuffer) {
            return ByteBuffer.allocateDirect((int) size);
          } else {
            return ByteBuffer.allocate((int) size);
          }
        }
      };
      ByteBufferArray array = new DummyByteBufferArray(7 * 1024 * 1024, false, allocator);
      // overwrite
      array.bufferCount = 25;
      array.buffers = new ByteBuffer[array.bufferCount + 1];
      array.createBuffers(true, allocator);
      for (int i = 0; i < array.buffers.length; i++) {
        if (i == array.buffers.length - 1) {
          assertEquals(array.buffers[i].capacity(), 0);
        } else {
          assertEquals(array.buffers[i].capacity(), 458752);
        }
      }
    }
  
    private static class DummyByteBufferArray extends ByteBufferArray {
  
      public DummyByteBufferArray(long capacity, boolean directByteBuffer,
          ByteBufferAllocator allocator) throws IOException {
        super(capacity, directByteBuffer, allocator);
      }
  
      @Override
      int getThreadCount() {
        return 16;
      }
    }
  }