1 package org.apache.lucene.store;
4 * Licensed to the Apache Software Foundation (ASF) under one or more
5 * contributor license agreements. See the NOTICE file distributed with
6 * this work for additional information regarding copyright ownership.
7 * The ASF licenses this file to You under the Apache License, Version 2.0
8 * (the "License"); you may not use this file except in compliance with
9 * the License. You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
20 import java.io.IOException;
21 import java.io.FileDescriptor;
22 import java.nio.ByteBuffer;
24 public final class NativePosixUtil {
25 public final static int NORMAL = 0;
26 public final static int SEQUENTIAL = 1;
27 public final static int RANDOM = 2;
28 public final static int WILLNEED = 3;
29 public final static int DONTNEED = 4;
30 public final static int NOREUSE = 5;
33 System.loadLibrary("NativePosixUtil");
36 private static native int posix_fadvise(FileDescriptor fd, long offset, long len, int advise) throws IOException;
37 public static native int posix_madvise(ByteBuffer buf, int advise) throws IOException;
38 public static native int madvise(ByteBuffer buf, int advise) throws IOException;
39 public static native FileDescriptor open_direct(String filename, boolean read) throws IOException;
40 public static native long pread(FileDescriptor fd, long pos, ByteBuffer byteBuf) throws IOException;
42 public static void advise(FileDescriptor fd, long offset, long len, int advise) throws IOException {
43 final int code = posix_fadvise(fd, offset, len, advise);
45 throw new RuntimeException("posix_fadvise failed code=" + code);