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.net;
  
  import java.nio.ByteBuffer;
  import java.util.Arrays;
  import java.util.Random;
  
  import org.junit.Test;
  
  import io.netty.buffer.ByteBuf;
  import org.apache.cassandra.config.DatabaseDescriptor;
  
  import static org.junit.Assert.assertArrayEquals;
  import static org.junit.Assert.assertEquals;
  
  public class BufferPoolAllocatorTest
  {
      @Test
      public void testAdoptedBufferContentAfterResize() {
          DatabaseDescriptor.clientInitialization();
          ByteBuf buffer = GlobalBufferPoolAllocator.instance.buffer(200, 500);
          assertEquals(200, GlobalBufferPoolAllocator.instance.usedSizeInBytes());
  
          byte[] content = new byte[300];
  
          Random rand = new Random();
          rand.nextBytes(content);
  
          buffer.writeBytes(Arrays.copyOfRange(content, 0, 200));
          assertEquals(200, GlobalBufferPoolAllocator.instance.usedSizeInBytes());
  
          buffer.writeBytes(Arrays.copyOfRange(content, 200, 300));
  
          byte[] bufferContent = new byte[300];
  
          BufferPoolAllocator.Wrapped wrapped = (BufferPoolAllocator.Wrapped) buffer;
          ByteBuffer adopted = wrapped.adopt();
          adopted.get(bufferContent);
          assertArrayEquals(content, bufferContent);
          assertEquals(500, GlobalBufferPoolAllocator.instance.usedSizeInBytes());
  
          GlobalBufferPoolAllocator.instance.put(adopted);
          assertEquals(0, GlobalBufferPoolAllocator.instance.usedSizeInBytes());
      }
  
      @Test
      public void testAdoptedBufferContentBeforeResize() {
          DatabaseDescriptor.clientInitialization();
          ByteBuf buffer = GlobalBufferPoolAllocator.instance.buffer(200, 300);
          assertEquals(200, GlobalBufferPoolAllocator.instance.usedSizeInBytes());
  
          byte[] content = new byte[200];
  
          Random rand = new Random();
          rand.nextBytes(content);
  
          buffer.writeBytes(content);
          assertEquals(200, GlobalBufferPoolAllocator.instance.usedSizeInBytes());
  
          byte[] bufferContent = new byte[200];
  
          BufferPoolAllocator.Wrapped wrapped = (BufferPoolAllocator.Wrapped) buffer;
          ByteBuffer adopted = wrapped.adopt();
          adopted.get(bufferContent);
          assertArrayEquals(content, bufferContent);
  
          GlobalBufferPoolAllocator.instance.put(adopted);
          assertEquals(0, GlobalBufferPoolAllocator.instance.usedSizeInBytes());
      }
  
      @Test
      public void testPutPooledBufferBackIntoPool() {
          DatabaseDescriptor.clientInitialization();
          ByteBuf buffer = GlobalBufferPoolAllocator.instance.buffer(200, 500);
          assertEquals(200, GlobalBufferPoolAllocator.instance.usedSizeInBytes());
          buffer.writeBytes(new byte[200]);
  
          buffer.release();
          assertEquals(0, GlobalBufferPoolAllocator.instance.usedSizeInBytes());
      }
  
      @Test
      public void testPutResizedBufferBackIntoPool() {
          DatabaseDescriptor.clientInitialization();
          ByteBuf buffer = GlobalBufferPoolAllocator.instance.buffer(200, 500);
          assertEquals(200, GlobalBufferPoolAllocator.instance.usedSizeInBytes());
          buffer.writeBytes(new byte[500]);
  
          buffer.release();
          assertEquals(0, GlobalBufferPoolAllocator.instance.usedSizeInBytes());
      }
  
      @Test
      public void testBufferDefaultMaxCapacity()
      {
          DatabaseDescriptor.clientInitialization();
          ByteBuf noMaxCapacity = GlobalBufferPoolAllocator.instance.buffer(100);
          noMaxCapacity.writeBytes(new byte[100]);
          assertEquals(100, noMaxCapacity.readableBytes());
          noMaxCapacity.release();
          assertEquals(0, GlobalBufferPoolAllocator.instance.usedSizeInBytes());
      }
  
      @Test
      public void testBufferWithMaxCapacity()
      {
          DatabaseDescriptor.clientInitialization();
          ByteBuf buffer = GlobalBufferPoolAllocator.instance.buffer(100, 500);
          buffer.writeBytes(new byte[500]);
          assertEquals(500, buffer.readableBytes());
          assertEquals(500, GlobalBufferPoolAllocator.instance.usedSizeInBytes());
          buffer.release();
          assertEquals(0, GlobalBufferPoolAllocator.instance.usedSizeInBytes());
      }
  
      @Test
      public void testBufferContentAfterResize()
      {
          DatabaseDescriptor.clientInitialization();
          ByteBuf buffer = GlobalBufferPoolAllocator.instance.buffer(200, 300);
          assertEquals(200, GlobalBufferPoolAllocator.instance.usedSizeInBytes());
  
          byte[] content = new byte[300];
  
          Random rand = new Random();
          rand.nextBytes(content);
  
          buffer.writeBytes(Arrays.copyOfRange(content, 0, 200));
          assertEquals(200, GlobalBufferPoolAllocator.instance.usedSizeInBytes());
  
          buffer.writeBytes(Arrays.copyOfRange(content, 200, 300));
  
          byte[] bufferContent = new byte[300];
          buffer.readBytes(bufferContent);
          assertArrayEquals(content, bufferContent);
          assertEquals(300, GlobalBufferPoolAllocator.instance.usedSizeInBytes());
          buffer.release();
          assertEquals(0, GlobalBufferPoolAllocator.instance.usedSizeInBytes());
      }
  
      @Test(expected = IndexOutOfBoundsException.class)
      public void testBufferExceedMaxCapacity()
      {
          DatabaseDescriptor.clientInitialization();
          ByteBuf maxCapacity = GlobalBufferPoolAllocator.instance.buffer(100, 200);
          try
          {
              maxCapacity.writeBytes(new byte[300]);
          } finally {
              maxCapacity.release();
              assertEquals(0, GlobalBufferPoolAllocator.instance.usedSizeInBytes());
          }
      }
  
      @Test
      public void testResizeBufferMultipleTimes()
      {
          DatabaseDescriptor.clientInitialization();
          ByteBuf buffer = GlobalBufferPoolAllocator.instance.buffer(100, 2000);
          buffer.writeBytes(new byte[200]);
          assertEquals(200, buffer.readableBytes());
          assertEquals(256, buffer.capacity());
          assertEquals(256, GlobalBufferPoolAllocator.instance.usedSizeInBytes());
  
          buffer.writeBytes(new byte[100]);
          assertEquals(300, buffer.readableBytes());
          assertEquals(512, buffer.capacity());
          assertEquals(512, GlobalBufferPoolAllocator.instance.usedSizeInBytes());
  
          buffer.writeBytes(new byte[300]);
          assertEquals(600, buffer.readableBytes());
          assertEquals(1024, buffer.capacity());
          assertEquals(1024, GlobalBufferPoolAllocator.instance.usedSizeInBytes());
  
          buffer.release();
          assertEquals(0, GlobalBufferPoolAllocator.instance.usedSizeInBytes());
      }
  
  }
  