package net.lvsq.jgossip.model;

public enum MessageType {
    SYNC_MESSAGE("sync_message"), ACK_MESSAGE("ack_message"), ACK2_MESSAGE("ack2_message"), SHUTDOWN("shutdown");

    private final String type;

    MessageType(String type) {
        this.type = type;
    }
}

// Copyright (c) 2017 The jgossip Authors. All rights reserved.
//
// 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 net.lvsq.jgossip.model;

/**
 * @author lvsq
 */
public enum MessageType {
    SYNC_MESSAGE("sync_message"), ACK_MESSAGE("ack_message"), ACK2_MESSAGE("ack2_message"), SHUTDOWN("shutdown");

    private final String type;

    MessageType(String type) {
        this.type = type;
    }
}

Update MessageType.java