| /* |
| * 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.drill.exec.store.parquet; |
| |
| import io.netty.buffer.DrillBuf; |
| |
| import java.nio.ByteBuffer; |
| import java.util.IdentityHashMap; |
| import java.util.Map; |
| |
| import org.apache.drill.exec.memory.BufferAllocator; |
| import org.apache.drill.exec.ops.OperatorContext; |
| |
| import org.apache.parquet.bytes.ByteBufferAllocator; |
| |
| /** |
| * {@link ByteBufferAllocator} implementation that uses Drill's {@link BufferAllocator} to allocate and release |
| * {@link ByteBuffer} objects.<br> |
| * To properly release an allocated {@link DrillBuf}, this class keeps track of it's corresponding {@link ByteBuffer} |
| * that was passed to the Parquet library. |
| */ |
| public class ParquetDirectByteBufferAllocator implements ByteBufferAllocator { |
| private static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(ParquetDirectByteBufferAllocator.class); |
| |
| private final BufferAllocator allocator; |
| private final Map<ByteBuffer, DrillBuf> allocatedBuffers = new IdentityHashMap<>(); |
| |
| public ParquetDirectByteBufferAllocator(OperatorContext o) { |
| this(o.getAllocator()); |
| } |
| |
| public ParquetDirectByteBufferAllocator(BufferAllocator allocator) { |
| this.allocator = allocator; |
| } |
| |
| @Override |
| public ByteBuffer allocate(int sz) { |
| DrillBuf drillBuf = allocator.buffer(sz); |
| ByteBuffer byteBuffer = drillBuf.nioBuffer(0, sz); |
| allocatedBuffers.put(byteBuffer, drillBuf); |
| logger.debug("{}: Allocated {} bytes. Allocated DrillBuf with id {} and ByteBuffer {}", this, sz, drillBuf.getId(), System.identityHashCode(byteBuffer)); |
| return byteBuffer; |
| } |
| |
| @Override |
| public void release(ByteBuffer byteBuffer) { |
| final DrillBuf drillBuf = allocatedBuffers.remove(byteBuffer); |
| // The ByteBuffer passed in may already have been freed or not allocated by this allocator. |
| // If it is not found in the allocated buffers, do nothing |
| if (drillBuf != null) { |
| logger.debug("{}: Freed DrillBuf with id {} and ByteBuffer {}", this, drillBuf.getId(), System.identityHashCode(byteBuffer)); |
| drillBuf.release(); |
| } else { |
| logger.warn("{}: ByteBuffer {} is not present", this, System.identityHashCode(byteBuffer)); |
| } |
| } |
| |
| @Override |
| public boolean isDirect() { |
| return true; |
| } |
| } |