/**
    *
    * 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.hadoop.hbase.util;
  
  import java.lang.management.ManagementFactory;
  import java.lang.management.RuntimeMXBean;
  import java.util.Arrays;
  import java.util.HashSet;
  import java.util.Locale;
  import java.util.Map.Entry;
  import java.util.Set;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.apache.hadoop.hbase.classification.InterfaceAudience;
  import org.apache.hadoop.conf.Configuration;
  import org.apache.hadoop.conf.Configured;
  import org.apache.hadoop.hbase.HBaseConfiguration;
  import org.apache.hadoop.util.Tool;
  import org.apache.hadoop.util.ToolRunner;
  
  /**
   * Base class for command lines that start up various HBase daemons.
   */
  @InterfaceAudience.Private
  public abstract class ServerCommandLine extends Configured implements Tool {
    private static final Log LOG = LogFactory.getLog(ServerCommandLine.class);
    @SuppressWarnings("serial")
    private static final Set<String> DEFAULT_SKIP_WORDS = new HashSet<String>() {
      {
        add("secret");
        add("passwd");
        add("password");
        add("credential");
      }
    };
  
    /**
     * Implementing subclasses should return a usage string to print out.
     */
    protected abstract String getUsage();
  
    /**
     * Print usage information for this command line.
     *
     * @param message if not null, print this message before the usage info.
     */
    protected void usage(String message) {
      if (message != null) {
        System.err.println(message);
        System.err.println("");
      }
  
      System.err.println(getUsage());
    }
  
    /**
     * Log information about the currently running JVM.
     */
    public static void logJVMInfo() {
      // Print out vm stats before starting up.
      RuntimeMXBean runtime = ManagementFactory.getRuntimeMXBean();
      if (runtime != null) {
        LOG.info("vmName=" + runtime.getVmName() + ", vmVendor=" +
                 runtime.getVmVendor() + ", vmVersion=" + runtime.getVmVersion());
        LOG.info("vmInputArguments=" + runtime.getInputArguments());
      }
    }
  
    /**
     * Logs information about the currently running JVM process including
     * the environment variables. Logging of env vars can be disabled by
     * setting {@code "hbase.envvars.logging.disabled"} to {@code "true"}.
     * <p>If enabled, you can also exclude environment variables containing
     * certain substrings by setting {@code "hbase.envvars.logging.skipwords"}
     * to comma separated list of such substrings.
     */
    public static void logProcessInfo(Configuration conf) {
      // log environment variables unless asked not to
      if (conf == null || !conf.getBoolean("hbase.envvars.logging.disabled", false)) {
        Set<String> skipWords = new HashSet<String>(DEFAULT_SKIP_WORDS);
        if (conf != null) {
          String[] confSkipWords = conf.getStrings("hbase.envvars.logging.skipwords");
         if (confSkipWords != null) {
           skipWords.addAll(Arrays.asList(confSkipWords));
         }
       }
 
       nextEnv:
       for (Entry<String, String> entry : System.getenv().entrySet()) {
         String key = entry.getKey().toLowerCase(Locale.ROOT);
         String value = entry.getValue().toLowerCase(Locale.ROOT);
         // exclude variables which may contain skip words
         for(String skipWord : skipWords) {
           if (key.contains(skipWord) || value.contains(skipWord))
             continue nextEnv;
         }
         LOG.info("env:"+entry);
       }
     }
     // and JVM info
     logJVMInfo();
   }
 
   /**
    * Parse and run the given command line. This may exit the JVM if
    * a nonzero exit code is returned from <code>run()</code>.
    */
   public void doMain(String args[]) {
     try {
       int ret = ToolRunner.run(HBaseConfiguration.create(), this, args);
       if (ret != 0) {
         System.exit(ret);
       }
     } catch (Exception e) {
       LOG.error("Failed to run", e);
       System.exit(-1);
     }
   }
 }