TupleToMessageMapper.java

/**
 * Copyright 2016 Yahoo Inc.
 *
 * 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.yahoo.pulsar.storm;

import java.io.Serializable;

import com.yahoo.pulsar.client.api.Message;

import backtype.storm.topology.OutputFieldsDeclarer;
import backtype.storm.tuple.Tuple;

public interface TupleToMessageMapper extends Serializable {

    /**
     * Convert tuple to {@link com.yahoo.pulsar.client.api.Message}.
     * 
     * @param tuple
     * @return
     */
    public Message toMessage(Tuple tuple);

    /**
     * Declare the output schema for the bolt.
     * 
     * @param declarer
     */
    public void declareOutputFields(OutputFieldsDeclarer declarer);
}