| /* |
| * 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; |
| |
| import io.netty.buffer.ByteBuf; |
| import io.netty.buffer.ByteBufInputStream; |
| import io.netty.buffer.UnpooledByteBufAllocator; |
| |
| import java.io.BufferedInputStream; |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.net.URI; |
| |
| import org.apache.hadoop.fs.FSDataInputStream; |
| import org.apache.hadoop.fs.FSDataOutputStream; |
| import org.apache.hadoop.fs.FileStatus; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.fs.PositionedReadable; |
| import org.apache.hadoop.fs.Seekable; |
| import org.apache.hadoop.fs.permission.FsPermission; |
| import org.apache.hadoop.util.Progressable; |
| |
| public class CachedSingleFileSystem extends FileSystem { |
| |
| private ByteBuf file; |
| private Path path; |
| |
| public CachedSingleFileSystem(Path path) throws IOException { |
| this.path = path; |
| File f = new File(path.toUri().getPath()); |
| long length = f.length(); |
| if (length > Integer.MAX_VALUE) { |
| throw new UnsupportedOperationException("Cached file system only supports files of less than 2GB."); |
| } |
| try (InputStream is = new BufferedInputStream(new FileInputStream(path.toUri().getPath()))) { |
| byte[] buffer = new byte[64*1024]; |
| this.file = UnpooledByteBufAllocator.DEFAULT.directBuffer((int) length); |
| int read; |
| while ( (read = is.read(buffer)) > 0) { |
| file.writeBytes(buffer, 0, read); |
| } |
| } |
| } |
| |
| @Override |
| public void close() throws IOException{ |
| file.release(); |
| super.close(); |
| } |
| |
| @Override |
| public FSDataOutputStream append(Path arg0, int arg1, Progressable arg2) throws IOException { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public FSDataOutputStream create(Path arg0, FsPermission arg1, boolean arg2, int arg3, short arg4, long arg5, |
| Progressable arg6) throws IOException { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public boolean delete(Path arg0) throws IOException { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public boolean delete(Path arg0, boolean arg1) throws IOException { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public FileStatus getFileStatus(Path arg0) throws IOException { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public URI getUri() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public Path getWorkingDirectory() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public FileStatus[] listStatus(Path arg0) throws IOException { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public boolean mkdirs(Path path, FsPermission arg1) throws IOException { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public FSDataInputStream open(Path path, int arg1) throws IOException { |
| if (!path.toString().equals(this.path)) { |
| throw new IOException(String.format("You requested file %s but this cached single file system only has the file %s.", path.toString(), this.path)); |
| } |
| return new FSDataInputStream(new CachedFSDataInputStream(file.slice())); |
| } |
| |
| @Override |
| public boolean rename(Path arg0, Path arg1) throws IOException { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public void setWorkingDirectory(Path arg0) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| |
| private class CachedFSDataInputStream extends ByteBufInputStream implements Seekable, PositionedReadable{ |
| private ByteBuf buf; |
| public CachedFSDataInputStream(ByteBuf buffer) { |
| super(buffer); |
| this.buf = buffer; |
| |
| } |
| |
| @Override |
| public long getPos() throws IOException { |
| return buf.readerIndex(); |
| } |
| |
| @Override |
| public void seek(long arg0) throws IOException { |
| buf.readerIndex((int) arg0); |
| } |
| |
| @Override |
| public boolean seekToNewSource(long arg0) throws IOException { |
| return false; |
| } |
| |
| @Override |
| public int read(long pos, byte[] buffer, int offset, int length) throws IOException { |
| ByteBuf local = buf.slice( (int) pos, (int) Math.min( buf.capacity() - pos, length)); |
| local.readBytes(buffer, offset, buf.capacity()); |
| return buf.capacity(); |
| } |
| |
| @Override |
| public void readFully(long pos, byte[] buffer) throws IOException { |
| readFully(pos, buffer, 0, buffer.length); |
| } |
| |
| @Override |
| public void readFully(long pos, byte[] buffer, int offset, int length) throws IOException { |
| if (length + pos > buf.capacity()) { |
| throw new IOException("Read was too big."); |
| } |
| read(pos, buffer, offset, length); |
| } |
| } |
| |
| } |