MessageHandler.java

/**
 * Copyright 2016-2017 Sixt GmbH & Co. Autovermietung KG
 * 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 com.sixt.service.framework.kafka.messaging;

import com.sixt.service.framework.OrangeContext;


public interface MessageHandler<T extends com.google.protobuf.Message> {

    /**
     * Callback interface to hand over a message.
     * <p>
     * Implementors need to consider that we have at least once deliery, i.e. messages may be delivered multiple times (and potentially out of order).
     * Thus, message handlers need to handle duplicate messages gracefully / be idempotent.
     *
     * @param message
     * @param context
     */
    void onMessage(Message<T> message, OrangeContext context);

}