| /** |
| * 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 |
| * <p> |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * <p> |
| * 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.fs.cosn; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.io.RandomAccessFile; |
| import java.nio.ByteBuffer; |
| import java.nio.MappedByteBuffer; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import org.apache.hadoop.util.CleanerUtil; |
| |
| /** |
| * The wrapper for memory buffers and disk buffers. |
| */ |
| public class ByteBufferWrapper { |
| private static final Logger LOG = |
| LoggerFactory.getLogger(ByteBufferWrapper.class); |
| private ByteBuffer byteBuffer; |
| private File file; |
| private RandomAccessFile randomAccessFile; |
| |
| ByteBufferWrapper(ByteBuffer byteBuffer) { |
| this(byteBuffer, null, null); |
| } |
| |
| ByteBufferWrapper(ByteBuffer byteBuffer, RandomAccessFile randomAccessFile, |
| File file) { |
| this.byteBuffer = byteBuffer; |
| this.file = file; |
| this.randomAccessFile = randomAccessFile; |
| } |
| |
| public ByteBuffer getByteBuffer() { |
| return this.byteBuffer; |
| } |
| |
| boolean isDiskBuffer() { |
| return this.file != null && this.randomAccessFile != null; |
| } |
| |
| private void munmap(MappedByteBuffer buffer) { |
| if (CleanerUtil.UNMAP_SUPPORTED) { |
| try { |
| CleanerUtil.getCleaner().freeBuffer(buffer); |
| } catch (IOException e) { |
| LOG.warn("Failed to unmap the buffer", e); |
| } |
| } else { |
| LOG.trace(CleanerUtil.UNMAP_NOT_SUPPORTED_REASON); |
| } |
| } |
| |
| void close() throws IOException { |
| if (null != this.byteBuffer) { |
| this.byteBuffer.clear(); |
| } |
| |
| IOException exception = null; |
| // catch all exceptions, and try to free up resources that can be freed. |
| try { |
| if (null != randomAccessFile) { |
| this.randomAccessFile.close(); |
| } |
| } catch (IOException e) { |
| LOG.error("Close the random access file occurs an exception.", e); |
| exception = e; |
| } |
| |
| if (this.byteBuffer instanceof MappedByteBuffer) { |
| munmap((MappedByteBuffer) this.byteBuffer); |
| } |
| |
| if (null != this.file && this.file.exists()) { |
| if (!this.file.delete()) { |
| LOG.warn("Delete the tmp file: [{}] failed.", |
| this.file.getAbsolutePath()); |
| } |
| } |
| |
| if (null != exception) { |
| throw exception; |
| } |
| } |
| } |