| /* |
| * 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.cassandra.utils; |
| |
| import java.util.Collections; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import com.sun.jna.LastErrorException; |
| import com.sun.jna.Native; |
| import com.sun.jna.Pointer; |
| |
| /** |
| * A {@code NativeLibraryWrapper} implementation for Windows. |
| * <p> This implementation only offers support for the {@code callGetpid} method |
| * using the Windows/Kernel32 library.</p> |
| * |
| * @see org.apache.cassandra.utils.NativeLibraryWrapper |
| * @see NativeLibrary |
| */ |
| public class NativeLibraryWindows implements NativeLibraryWrapper |
| { |
| private static final Logger logger = LoggerFactory.getLogger(NativeLibraryWindows.class); |
| |
| private static boolean available; |
| |
| static |
| { |
| try |
| { |
| Native.register(com.sun.jna.NativeLibrary.getInstance("kernel32", Collections.emptyMap())); |
| available = true; |
| } |
| catch (NoClassDefFoundError e) |
| { |
| logger.warn("JNA not found. Native methods will be disabled."); |
| } |
| catch (UnsatisfiedLinkError e) |
| { |
| logger.error("Failed to link the Windows/Kernel32 library against JNA. Native methods will be unavailable.", e); |
| } |
| catch (NoSuchMethodError e) |
| { |
| logger.warn("Obsolete version of JNA present; unable to register Windows/Kernel32 library. Upgrade to JNA 3.2.7 or later"); |
| } |
| } |
| |
| /** |
| * Retrieves the process identifier of the calling process (<a href='https://msdn.microsoft.com/en-us/library/windows/desktop/ms683180(v=vs.85).aspx'>GetCurrentProcessId function</a>). |
| * |
| * @return the process identifier of the calling process |
| */ |
| private static native long GetCurrentProcessId() throws LastErrorException; |
| |
| public int callMlockall(int flags) throws UnsatisfiedLinkError, RuntimeException |
| { |
| throw new UnsatisfiedLinkError(); |
| } |
| |
| public int callMunlockall() throws UnsatisfiedLinkError, RuntimeException |
| { |
| throw new UnsatisfiedLinkError(); |
| } |
| |
| public int callFcntl(int fd, int command, long flags) throws UnsatisfiedLinkError, RuntimeException |
| { |
| throw new UnsatisfiedLinkError(); |
| } |
| |
| public int callPosixFadvise(int fd, long offset, int len, int flag) throws UnsatisfiedLinkError, RuntimeException |
| { |
| throw new UnsatisfiedLinkError(); |
| } |
| |
| public int callOpen(String path, int flags) throws UnsatisfiedLinkError, RuntimeException |
| { |
| throw new UnsatisfiedLinkError(); |
| } |
| |
| public int callFsync(int fd) throws UnsatisfiedLinkError, RuntimeException |
| { |
| throw new UnsatisfiedLinkError(); |
| } |
| |
| public int callClose(int fd) throws UnsatisfiedLinkError, RuntimeException |
| { |
| throw new UnsatisfiedLinkError(); |
| } |
| |
| public Pointer callStrerror(int errnum) throws UnsatisfiedLinkError, RuntimeException |
| { |
| throw new UnsatisfiedLinkError(); |
| } |
| |
| /** |
| * @return the PID of the JVM running |
| * @throws UnsatisfiedLinkError if we fail to link against Sigar |
| * @throws RuntimeException if another unexpected error is thrown by Sigar |
| */ |
| public long callGetpid() throws UnsatisfiedLinkError, RuntimeException |
| { |
| return GetCurrentProcessId(); |
| } |
| |
| public boolean isAvailable() |
| { |
| return available; |
| } |
| } |