code: /**
   * Copyright 2018 Alexey Ragozin
   *
   * Licensed 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.gridkit.jvmtool.cmd;
  
  import java.util.Map;
  import java.util.Properties;
  
  import org.gridkit.jvmtool.cli.CommandLauncher;
  import org.gridkit.jvmtool.cli.CommandLauncher.CmdRef;
  import org.gridkit.lab.jvm.attach.AttachManager;
  import org.gridkit.lab.jvm.attach.JavaProcessDetails;
  import org.gridkit.lab.jvm.perfdata.JStatData;
  import org.gridkit.lab.jvm.perfdata.JStatData.Counter;
  import org.gridkit.lab.jvm.perfdata.JStatData.TickCounter;
  
  import com.beust.jcommander.Parameter;
  import com.beust.jcommander.Parameters;
  import com.beust.jcommander.ParametersDelegate;
  
  /**
   * Dump certain details via attach API
   *
   * @author Alexey Ragozin (alexey.ragozin@gmail.com)
   */
  public class VmInfoCmd implements CmdRef {
  
      @Override
      public String getCommandName() {
          return "vminfo";
      }
  
      @Override
      public Runnable newCommand(CommandLauncher host) {
          return new VmInfo(host);
      }
  
      @Parameters(commandDescription = "[VMINFO] Dumps various from local VM")
      public static class VmInfo implements Runnable {
  
          @ParametersDelegate
          private final CommandLauncher host;
  
  // need jcmd support in attach API
          @Parameter(names = {"--flags"}, required = false, description = "Dump XX flags")
          private boolean dumpVmFlags = false;
  
          @Parameter(names = {"--sysprops"}, required = false, description = "Dump System.getProperties()")
          private boolean dumpSysProps = false;
  
          @Parameter(names = {"--agentprops"}, required = false, description = "Dump agent properties")
          private boolean dumpAgentProps = false;
  
          @Parameter(names = {"--perf"}, required = false, description = "Dump perf counters")
          private boolean dumpPerfCounters = false;
  
          @Parameter(names = {"-p"}, required = true, description = "Target JVM PID")
          private String pid;
  
          public VmInfo(CommandLauncher host) {
              this.host = host;
          }
  
          @Override
          public void run() {
  
              if (!(dumpVmFlags | dumpSysProps | dumpAgentProps | dumpPerfCounters)) {
                  host.failAndPrintUsage("No dump option specified");
              }
  
              JavaProcessDetails jpd = AttachManager.getDetails(Long.parseLong(pid));
  
              if (dumpVmFlags) {
                  StringBuilder sb = new StringBuilder();
                  jpd.jcmd("VM.flags -all", sb);
                  System.out.println(sb);
              }
              if (dumpSysProps) {
                  dumpProps(jpd.getSystemProperties());
              }
              if (dumpAgentProps) {
                  dumpProps(jpd.getAgentProperties());
              }
              if (dumpPerfCounters) {
                  JStatData jsd = JStatData.connect(Long.parseLong(pid));
                  dumpPerf(jsd.getAllCounters());
              }
          }
  
          private void dumpPerf(Map<String, Counter<?>> allCounters) {
              for(String key: allCounters.keySet()) {
                  Counter<?> c = allCounters.get(key);
                  if (c instanceof TickCounter) {
                      String val = c.toString();
                      String suffix = "";
                      if (val.lastIndexOf('[') >= 0) {
                          suffix = " " + val.substring(val.lastIndexOf('['));
                      }
                      System.out.println(key + ": " + ((TickCounter)c).getNanos() + " ns" + suffix);
                  }
                  else {
                      System.out.println(allCounters.get(key));
                  }
              }
  
          }
  
          private void dumpProps(Properties systemProperties) {
              for(Object k: systemProperties.keySet()) {
                  String key = (String) k;
                  System.out.println(key + ": " + systemProperties.getProperty(key));
              }
          }
      }
  }
  