/
StreamMultipleTupleExtractor.java
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/
StreamMultipleTupleExtractor.java
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/*
* 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.ignite.stream;
import java.util.Map;
/**
* Stream tuple extractor to convert a single message to zero, one or many tuples.
* <p>
* For cases where cardinality will always be 1:1 (or 0:1), you may consider {@link StreamTupleExtractor}.
*
* @see StreamTupleExtractor
*/
public interface StreamMultipleTupleExtractor<T, K, V> {
/**
* Extracts a set of key-values from a message.
*
* @param msg Message.
* @return Map containing resulting tuples.
*/
public Map<K, V> extract(T msg);
}