content: /*
   * Copyright 2014-2025 Real Logic Limited.
   *
   * 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
   *
   * https://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 io.aeron.samples;
  
  import io.aeron.CncFileDescriptor;
  import io.aeron.CommonContext;
  import io.aeron.DriverProxy;
  import io.aeron.exceptions.AeronException;
  import org.agrona.DirectBuffer;
  import org.agrona.IoUtil;
  import org.agrona.concurrent.ringbuffer.ManyToOneRingBuffer;
  
  import java.io.File;
  import java.nio.MappedByteBuffer;
  import java.util.Date;
  
  import static io.aeron.CncFileDescriptor.*;
  
  /**
   * Tool for printing out Aeron Media Driver Information. A command-and-control (CnC) file is maintained by a
   * media driver in shared memory. This application reads the CnC file and prints its status. Layout of the Cnc file is
   * described in {@link CncFileDescriptor}.
   */
  public class DriverTool
  {
      /**
       * Main method for launching the process.
       *
       * @param args passed to the process.
       */
      public static void main(final String[] args)
      {
          boolean printPidOnly = false;
          boolean terminateDriver = false;
  
          if (0 != args.length)
          {
              checkForHelp(args);
  
              if (args[0].equals("pid"))
              {
                  printPidOnly = true;
              }
              else if (args[0].equals("terminate"))
              {
                  terminateDriver = true;
              }
          }
  
          final File cncFile = CommonContext.newDefaultCncFile();
          final MappedByteBuffer cncByteBuffer = IoUtil.mapExistingFile(cncFile, "cnc");
          final DirectBuffer cncMetaData = createMetaDataBuffer(cncByteBuffer);
          final int cncVersion = cncMetaData.getInt(cncVersionOffset(0));
  
          checkVersion(cncVersion);
  
          final ManyToOneRingBuffer toDriver = new ManyToOneRingBuffer(createToDriverBuffer(cncByteBuffer, cncMetaData));
  
          if (printPidOnly)
          {
              System.out.println(pid(cncMetaData));
          }
          else if (terminateDriver)
          {
              final DriverProxy driverProxy = new DriverProxy(toDriver, toDriver.nextCorrelationId());
  
              if (!driverProxy.terminateDriver(null, 0, 0))
              {
                  throw new AeronException("could not send termination request.");
              }
          }
          else
          {
              System.out.println("Command `n Control file: " + cncFile);
              System.out.println("Version: " + cncVersion + ", PID: " + pid(cncMetaData));
              printDateActivityAndStartTimestamps(startTimestampMs(cncMetaData), toDriver.consumerHeartbeatTime());
          }
      }
  
      private static void printDateActivityAndStartTimestamps(final long startTimestamp, final long activityTimestamp)
      {
          System.out.format(
              "%1$tH:%1$tM:%1$tS (start: %2$tF %2$tH:%2$tM:%2$tS, activity: %3$tF %3$tH:%3$tM:%3$tS)%n",
              new Date(),
              new Date(startTimestamp),
              new Date(activityTimestamp));
      }
  
      private static void checkForHelp(final String[] args)
      {
          for (final String arg : args)
          {
              if ("-?".equals(arg) || "-h".equals(arg) || "-help".equals(arg))
              {
                  System.out.format(
                      "Usage: [-Daeron.dir=<directory containing CnC file>] DriverTool <pid> <terminate>%n" +
                      "    pid: prints PID of driver only%n" +
                      "    terminate: request the driver to terminate%n");
                  System.out.flush();
                  System.exit(0);
              }
          }
      }
  }
  