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.arrow.memory.unsafe;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertInstanceOf;
  
  import org.apache.arrow.memory.AllocationManager;
  import org.apache.arrow.memory.ArrowBuf;
  import org.apache.arrow.memory.BufferAllocator;
  import org.apache.arrow.memory.BufferLedger;
  import org.apache.arrow.memory.RootAllocator;
  import org.junit.jupiter.api.Test;
  
  /** Test cases for {@link UnsafeAllocationManager}. */
  public class TestUnsafeAllocationManager {
  
    private BufferAllocator createUnsafeAllocator() {
      return new RootAllocator(
          RootAllocator.configBuilder()
              .allocationManagerFactory(UnsafeAllocationManager.FACTORY)
              .build());
    }
  
    private void readWriteArrowBuf(ArrowBuf buffer) {
      // write buffer
      for (long i = 0; i < buffer.capacity() / 8; i++) {
        buffer.setLong(i * 8, i);
      }
  
      // read buffer
      for (long i = 0; i < buffer.capacity() / 8; i++) {
        long val = buffer.getLong(i * 8);
        assertEquals(i, val);
      }
    }
  
    /** Test the memory allocation for {@link UnsafeAllocationManager}. */
    @Test
    public void testBufferAllocation() {
      final long bufSize = 4096L;
      try (BufferAllocator allocator = createUnsafeAllocator();
          ArrowBuf buffer = allocator.buffer(bufSize)) {
        assertInstanceOf(BufferLedger.class, buffer.getReferenceManager());
        BufferLedger bufferLedger = (BufferLedger) buffer.getReferenceManager();
  
        // make sure we are using unsafe allocation manager
        AllocationManager allocMgr = bufferLedger.getAllocationManager();
        assertInstanceOf(UnsafeAllocationManager.class, allocMgr);
        UnsafeAllocationManager unsafeMgr = (UnsafeAllocationManager) allocMgr;
  
        assertEquals(bufSize, unsafeMgr.getSize());
        readWriteArrowBuf(buffer);
      }
    }
  }
  