package org.apache.maven.surefire.api.booter;
   
   /*
    * 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.
   */
  
  import org.apache.maven.surefire.api.stream.AbstractStreamDecoder.Segment;
  
  import java.util.HashMap;
  import java.util.Map;
  
  import static java.nio.charset.StandardCharsets.US_ASCII;
  import static java.util.Objects.requireNonNull;
  
  /**
   * Commands which are sent from plugin to the forked jvm.
   *
   * @author <a href="mailto:tibordigana@apache.org">Tibor Digana (tibor17)</a>
   * @since 2.19
   */
  public enum MasterProcessCommand
  {
      RUN_CLASS( "run-testclass", String.class ),
      TEST_SET_FINISHED( "testset-finished", Void.class ),
      SKIP_SINCE_NEXT_TEST( "skip-since-next-test", Void.class ),
      SHUTDOWN( "shutdown", String.class ),
  
      /** To tell a forked process that the master process is still alive. Repeated after 10 seconds. */
      NOOP( "noop", Void.class ),
      BYE_ACK( "bye-ack", Void.class );
  
      // due to have fast and thread-safe Map
      public static final Map<Segment, MasterProcessCommand> COMMAND_TYPES = segmentsToCmds();
  
      private final String opcode;
      private final byte[] opcodeBinary;
      private final Class<?> dataType;
  
      MasterProcessCommand( String opcode, Class<?> dataType )
      {
          this.opcode = requireNonNull( opcode, "value cannot be null" );
          opcodeBinary = opcode.getBytes( US_ASCII );
          this.dataType = requireNonNull( dataType, "dataType cannot be null" );
      }
  
      public byte[] getOpcodeBinary()
      {
          return opcodeBinary;
      }
  
      public int getOpcodeLength()
      {
          return opcodeBinary.length;
      }
  
      public Class<?> getDataType()
      {
          return dataType;
      }
  
      public boolean hasDataType()
      {
          return dataType != Void.class;
      }
  
      @Override
      public String toString()
      {
          return opcode;
      }
  
      private static Map<Segment, MasterProcessCommand> segmentsToCmds()
      {
          Map<Segment, MasterProcessCommand> commands = new HashMap<>();
          for ( MasterProcessCommand command : MasterProcessCommand.values() )
          {
              byte[] array = command.toString().getBytes( US_ASCII );
              commands.put( new Segment( array, 0, array.length ), command );
          }
          return commands;
      }
  }