package org.apache.lucene.store;
import java.io.IOException;
import java.io.FileDescriptor;
import java.nio.ByteBuffer;
public final class NativePosixUtil {
public final static int NORMAL = 0;
public final static int SEQUENTIAL = 1;
public final static int RANDOM = 2;
public final static int WILLNEED = 3;
public final static int DONTNEED = 4;
public final static int NOREUSE = 5;
static {
System.loadLibrary("NativePosixUtil");
}
private static native int posix_fadvise(FileDescriptor fd, long offset, long len, int advise) throws IOException;
public static native int posix_madvise(ByteBuffer buf, int advise) throws IOException;
public static native int madvise(ByteBuffer buf, int advise) throws IOException;
public static native FileDescriptor open_direct(String filename, boolean read) throws IOException;
public static native long pread(FileDescriptor fd, long pos, ByteBuffer byteBuf) throws IOException;
public static void advise(FileDescriptor fd, long offset, long len, int advise) throws IOException {
final int code = posix_fadvise(fd, offset, len, advise);
if (code != 0) {
throw new RuntimeException("posix_fadvise failed code=" + code);
}
}
}