| /* |
| * 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.jena.tdb.base.file; |
| |
| import java.io.IOException ; |
| import java.nio.ByteBuffer ; |
| import java.nio.channels.FileChannel ; |
| |
| import org.apache.jena.atlas.io.IO ; |
| import org.slf4j.Logger ; |
| import org.slf4j.LoggerFactory ; |
| |
| /** Single, unsegmented file with ByteBuffer */ |
| public class PlainFilePersistent extends PlainFile |
| { |
| private static Logger log = LoggerFactory.getLogger(PlainFilePersistent.class) ; |
| |
| private FileBase file ; |
| |
| // Plain file over mmapped ByteBuffer |
| PlainFilePersistent(Location loc, String filename) |
| { |
| this(loc.getPath(filename, "dat")) ; |
| } |
| |
| PlainFilePersistent(String filename) |
| { |
| file = FileBase.create(filename) ; |
| //long filesize = file.out.length() ; |
| //if ( channel.size() == 0 ) {} |
| byteBuffer = allocateBuffer(filesize) ; |
| } |
| |
| @Override |
| public void sync() |
| { |
| file.sync() ; |
| } |
| |
| @Override |
| public void close() |
| { |
| file.close() ; |
| } |
| |
| @Override |
| protected ByteBuffer allocateBuffer(long size) |
| { |
| try { return file.channel().map(FileChannel.MapMode.READ_WRITE, 0, size) ; } |
| catch (IOException ex) { IO.exception(ex) ; return null ; } |
| } |
| } |