Github user GJL commented on a diff in the pull request:

    https://github.com/apache/flink/pull/5410#discussion_r193964437
  
    --- Diff: 
flink-connectors/flink-connector-rabbitmq/src/main/java/org/apache/flink/streaming/connectors/rabbitmq/RMQSinkPublishOptions.java
 ---
    @@ -0,0 +1,70 @@
    +/*
    + * 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.
    + */
    +
    +package org.apache.flink.streaming.connectors.rabbitmq;
    +
    +import org.apache.flink.annotation.PublicEvolving;
    +
    +import com.rabbitmq.client.AMQP.BasicProperties;
    +
    +/**
    + * The message computation provides methods to compute the message routing 
key and/or the properties.
    + *
    + * @param <IN> The type of the data used by the sink.
    + */
    +@PublicEvolving
    +public interface RMQSinkPublishOptions<IN> extends java.io.Serializable {
    +
    +   /**
    +    * Compute the message's routing key from the data.
    +    * @param a The data used by the sink
    +    * @return The routing key of the message
    +    */
    +   String computeRoutingKey(IN a);
    +
    +   /**
    +    * Compute the message's properties from the data.
    +    * @param a The data used by the sink
    +    * @return The message's properties (can be null)
    +    */
    +   BasicProperties computeProperties(IN a);
    +
    +   /**
    +    * Compute the exchange from the data.
    +    * @param a The data used by the sink
    +    * @return The exchange to publish the message to
    +    */
    +   String computeExchange(IN a);
    +
    +   /**
    +    * Compute the mandatory flag used in basic.publish method
    +    * See AMQP API help for values.
    +    * A ReturnListener is mandatory if this flag can be true (if not it is 
ignored and forced to false)
    +    * @param a The data used by the sink
    +    * @return The mandatory flag
    +    */
    +   boolean computeMandatory(IN a);
    --- End diff --
    
    ping


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