surefire-api/src/main/java/org/apache/maven/surefire/api/booter/MasterProcessCommand.java

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 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( String.class ),
    TEST_SET_FINISHED( Void.class ),
    SKIP_SINCE_NEXT_TEST( Void.class ),
    SHUTDOWN( String.class ),

    /** To tell a forked process that the master process is still alive. Repeated after 10 seconds. */
    NOOP( Void.class ),
    BYE_ACK( Void.class );

    public static final String MAGIC_NUMBER = "maven-surefire-command";

    private final Class<?> dataType;

    MasterProcessCommand( Class<?> dataType )
    {
        this.dataType = requireNonNull( dataType, "dataType cannot be null" );
    }

    public Class<?> getDataType()
    {
        return dataType;
    }

    public boolean hasDataType()
    {
        return dataType != Void.class;
    }
}