content: /*
   * 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 com.alibaba.metrics.os.utils;
  
  
  import com.alibaba.metrics.os.linux.CpuUsageGaugeSet;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.io.File;
  import java.io.FileOutputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.lang.reflect.Field;
  import java.net.URL;
  
  public class SystemInfoUtils {
  
      private static final Logger logger = LoggerFactory.getLogger(CpuUsageGaugeSet.class);
  
      public static String MAC_FILE_NAME = "libsigar-universal64-macosx.dylib";
      public static String WINDOWS_FILE_NAME = "sigar-amd64-winnt.dll";
  
      public static org.hyperic.sigar.Sigar sigar = null;
  
      public static void init(){
  
          if (needLoad()){
  
              try {
                  loadLib();
                  sigar = new org.hyperic.sigar.Sigar();
              } catch (Throwable e) {
                  logger.error("Load dll error!", e);
              }
          }
  
      }
  
      public static boolean needLoad(){
  
          boolean os = false;
          boolean arch = false;
  
          String osName = System.getProperty("os.name");
          if (osName != null){
              if (osName.contains("Windows") || osName.contains("Mac")){
                  os = true;
              }
          }
  
          String osArch = System.getProperty("os.arch");
          if (osArch != null){
              arch = osArch.contains("64");
          }
  
          return os & arch;
      }
  
      public static void loadLib() throws IOException{
  
          String osName = System.getProperty("os.name");
          String resource = "/";
  
          if (osName.contains("Windows")){
              resource = resource + WINDOWS_FILE_NAME;
          }else if (osName.contains("Mac")) {
              resource = resource + MAC_FILE_NAME;
          }
  
  
          InputStream input = SystemInfoUtils.class.getResourceAsStream(resource);
  
          URL res = SystemInfoUtils.class.getResource(resource);
  
          String path = res.getPath();
          if (path.indexOf("!") > 0)  {
              path = path.substring(0, path.substring(0, path.indexOf("!")).lastIndexOf("/")) + resource;
          }
          if (path.indexOf(":") > 0 && !osName.contains("Windows")) {
              path = path.substring(path.indexOf(":") + 1);
          }
  
          //fix windows sigar
          if(path != null && path.startsWith("file:/")) {
              path = path.substring(6);
          }
  
          File file = new File(path);
  
          if (!file.exists()) {
              file.createNewFile();
              OutputStream out = new FileOutputStream(file);
              int read;
              byte[] bytes = new byte[8192];
  
              while ((read = input.read(bytes)) != -1) {
                  out.write(bytes, 0, read);
              }
              out.flush();
              out.close();
          }
  
          if (file != null){
              System.setProperty("org.hyperic.sigar.path", file.getParent());
              System.load(file.getPath());
          }
      }
  
  
      public static void addLibraryDir(String libraryPath) throws IOException {
          try {
              Field field = ClassLoader.class.getDeclaredField("usr_paths");
              field.setAccessible(true);
              String[] paths = (String[]) field.get(null);
              for (int i = 0; i < paths.length; i++) {
                  if (libraryPath.equals(paths[i])) {
                      return;
                  }
              }
  
              String[] tmp = new String[paths.length + 1];
              System.arraycopy(paths, 0, tmp, 0, paths.length);
              tmp[paths.length] = libraryPath;
              field.set(null, tmp);
          } catch (IllegalAccessException e) {
              throw new IOException(
                      "Failedto get permissions to set library path");
          } catch (NoSuchFieldException e) {
              throw new IOException(
                      "Failedto get field handle to set library path");
          }
      }
  
      public static void main(String[] args) {
          SystemInfoUtils.init();
          System.out.println(System.getProperty("java.library.path"));
          System.out.println(SystemInfoUtils.sigar);;
      }
  }
  
  