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/*
 * 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 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.
 * 

This implementation only offers support for the {@code callGetpid} method * using the Windows/Kernel32 library.

* * @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("kernel32"); 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 (GetCurrentProcessId function). * * @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; } }




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