| /* |
| * 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.ignite.internal.mem.file; |
| |
| import java.io.Closeable; |
| import java.io.File; |
| import java.io.IOException; |
| import java.io.RandomAccessFile; |
| import java.lang.reflect.InvocationTargetException; |
| import java.lang.reflect.Method; |
| import org.apache.ignite.internal.mem.DirectMemoryRegion; |
| import org.apache.ignite.internal.mem.UnsafeChunk; |
| import org.apache.ignite.internal.util.typedef.internal.U; |
| import sun.nio.ch.FileChannelImpl; |
| |
| /** */ |
| public class MappedFile implements Closeable, DirectMemoryRegion { |
| /** */ |
| private static final Method map0 = U.findNonPublicMethod(FileChannelImpl.class, "map0", int.class, long.class, long.class); |
| |
| /** */ |
| private static final Method unmap0 = U.findNonPublicMethod(FileChannelImpl.class, "unmap0", long.class, long.class); |
| |
| /** */ |
| public static final int MAP_RW = 1; |
| |
| /** */ |
| private final RandomAccessFile file; |
| |
| /** */ |
| private final long addr; |
| |
| /** */ |
| private final long size; |
| |
| /** |
| * @param name File path. |
| * @param size Expected file size. If size is 0, the existing size will be used. |
| * @throws IOException If failed to open the file or memory-map it. |
| */ |
| public MappedFile(File name, long size) throws IOException { |
| file = new RandomAccessFile(name, "rw"); |
| |
| try { |
| if (size == 0) |
| size = file.length(); |
| else |
| file.setLength(size); |
| |
| addr = map(file, MAP_RW, 0, size); |
| |
| this.size = size; |
| } catch (IOException e) { |
| file.close(); |
| |
| throw e; |
| } |
| } |
| |
| /** |
| * Gets underlying random access file. |
| * |
| * @return Random access file. |
| */ |
| public final RandomAccessFile file() { |
| return file; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public void close() throws IOException { |
| try { |
| unmap(addr, size); |
| } |
| finally { |
| file.close(); |
| } |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public final long address() { |
| return addr; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public final long size() { |
| return size; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public DirectMemoryRegion slice(long offset) { |
| if (offset < 0 || offset >= size) |
| throw new IllegalArgumentException("Failed to create a memory region slice [ptr=" + U.hexLong(addr) + |
| ", len=" + size + ", offset=" + offset + ']'); |
| |
| return new UnsafeChunk(addr + offset, size - offset); |
| } |
| |
| /** |
| * Maps the given region of the file. |
| * |
| * @param f File to map. |
| * @param mode Mode to map. |
| * @param start Mapping start offset within the file. |
| * @param size Size of file to map. |
| * @return Pointer to the mapped memory region. |
| * @throws IOException |
| */ |
| public static long map(RandomAccessFile f, int mode, long start, long size) throws IOException { |
| try { |
| return (Long) map0.invoke(f.getChannel(), mode, start, size); |
| } |
| catch (IllegalAccessException e) { |
| throw new IllegalStateException(e); |
| } |
| catch (InvocationTargetException e) { |
| Throwable target = e.getTargetException(); |
| throw (target instanceof IOException) ? (IOException) target : new IOException(target); |
| } |
| } |
| |
| /** |
| * Un-maps the given region of the file. |
| * |
| * @param addr Previously mapped address to un-map. |
| * @param size Size of the mapped file. |
| */ |
| public static void unmap(long addr, long size) { |
| try { |
| unmap0.invoke(null, addr, size); |
| } |
| catch (IllegalAccessException e) { |
| throw new IllegalStateException(e); |
| } |
| catch (InvocationTargetException e) { |
| throw new IllegalStateException(e.getTargetException()); |
| } |
| } |
| } |