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[streaming] CoFlatMap & CoGroupReduce functionality
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...ming-core/src/main/java/org/apache/flink/streaming/api/function/co/CoFlatMapFunction.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. | ||
| */ | ||
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| package org.apache.flink.streaming.api.function.co; | ||
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| import java.io.Serializable; | ||
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| import org.apache.flink.api.common.functions.Function; | ||
| import org.apache.flink.util.Collector; | ||
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| /** | ||
| * A CoFlatMapFunction represents a FlatMap transformation with two different | ||
| * input types. | ||
| * | ||
| * @param <IN1> | ||
| * Type of the first input. | ||
| * @param <IN2> | ||
| * Type of the second input. | ||
| * @param <OUT> | ||
| * Output type. | ||
| */ | ||
| public interface CoFlatMapFunction<IN1, IN2, OUT> extends Function, Serializable { | ||
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| public void flatMap1(IN1 value, Collector<OUT> out) throws Exception; | ||
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| public void flatMap2(IN2 value, Collector<OUT> out) throws Exception; | ||
| } |
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...aming-core/src/main/java/org/apache/flink/streaming/api/function/co/CoReduceFunction.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. | ||
| */ | ||
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| package org.apache.flink.streaming.api.function.co; | ||
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| import java.io.Serializable; | ||
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| import org.apache.flink.api.common.functions.Function; | ||
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| /** | ||
| * The CoReduceFunction interface represents a Reduce transformation with two | ||
| * different input streams. The reduce1 function combine groups of elements of | ||
| * the first input with the same key to a single value, while reduce2 combine | ||
| * groups of elements of the second input with the same key to a single value. | ||
| * Each produced values are mapped to the same type by map1 and map2, | ||
| * respectively, to form one output stream. | ||
| * | ||
| * The basic syntax for using a grouped ReduceFunction is as follows: | ||
| * | ||
| * <pre> | ||
| * <blockquote> | ||
| * ConnectedDataStream<X> input = ...; | ||
| * | ||
| * ConnectedDataStream<X> result = input.groupBy(keyPosition1, keyPosition2) | ||
| * .reduce(new MyCoReduceFunction(), keyPosition1, keyPosition2).addSink(...); | ||
| * </blockquote> | ||
| * </pre> | ||
| * <p> | ||
| * | ||
| * @param <IN1> | ||
| * Type of the first input. | ||
| * @param <IN2> | ||
| * Type of the second input. | ||
| * @param <OUT> | ||
| * Output type. | ||
| */ | ||
| public interface CoReduceFunction<IN1, IN2, OUT> extends Function, Serializable { | ||
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| /** | ||
| * The core method of CoReduceFunction, combining two values of the first | ||
| * input into one value of the same type. The reduce1 function is | ||
| * consecutively applied to all values of a group until only a single value | ||
| * remains. | ||
| * | ||
| * @param value1 | ||
| * The first value to combine. | ||
| * @param value2 | ||
| * The second value to combine. | ||
| * @return The combined value of both input values. | ||
| * | ||
| * @throws Exception | ||
| * This method may throw exceptions. Throwing an exception will | ||
| * cause the operation to fail and may trigger recovery. | ||
| */ | ||
| public abstract IN1 reduce1(IN1 value1, IN1 value2); | ||
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| /** | ||
| * The core method of ReduceFunction, combining two values of the second | ||
| * input into one value of the same type. The reduce2 function is | ||
| * consecutively applied to all values of a group until only a single value | ||
| * remains. | ||
| * | ||
| * @param value1 | ||
| * The first value to combine. | ||
| * @param value2 | ||
| * The second value to combine. | ||
| * @return The combined value of both input values. | ||
| * | ||
| * @throws Exception | ||
| * This method may throw exceptions. Throwing an exception will | ||
| * cause the operation to fail and may trigger recovery. | ||
| */ | ||
| public abstract IN2 reduce2(IN2 value1, IN2 value2); | ||
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| /** | ||
| * Maps the reduced first input to the output type. | ||
| * | ||
| * @param <IN1> | ||
| * Type of the first input. | ||
| * @param <IN2> | ||
| * Type of the second input. | ||
| * @param <OUT> | ||
| * Output type. | ||
| */ | ||
| public abstract OUT map1(IN1 value); | ||
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| /** | ||
| * Maps the reduced second input to the output type. | ||
| * | ||
| * @param <IN1> | ||
| * Type of the first input. | ||
| * @param <IN2> | ||
| * Type of the second input. | ||
| * @param <OUT> | ||
| * Output type. | ||
| */ | ||
| public abstract OUT map2(IN2 value); | ||
| } |
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...rc/main/java/org/apache/flink/streaming/api/invokable/operator/co/CoFlatMapInvokable.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. | ||
| * | ||
| */ | ||
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| package org.apache.flink.streaming.api.invokable.operator.co; | ||
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| import org.apache.flink.api.common.functions.RichFunction; | ||
| import org.apache.flink.configuration.Configuration; | ||
| import org.apache.flink.streaming.api.function.co.CoFlatMapFunction; | ||
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| public class CoFlatMapInvokable<IN1, IN2, OUT> extends CoInvokable<IN1, IN2, OUT> { | ||
| private static final long serialVersionUID = 1L; | ||
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| private CoFlatMapFunction<IN1, IN2, OUT> flatMapper; | ||
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| public CoFlatMapInvokable(CoFlatMapFunction<IN1, IN2, OUT> flatMapper) { | ||
| super(flatMapper); | ||
| this.flatMapper = flatMapper; | ||
| } | ||
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| @Override | ||
| public void handleStream1() throws Exception { | ||
| flatMapper.flatMap1(reuse1.getObject(), collector); | ||
| } | ||
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| @Override | ||
| public void handleStream2() throws Exception { | ||
| flatMapper.flatMap2(reuse2.getObject(), collector); | ||
| } | ||
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| @Override | ||
| public void open(Configuration parameters) throws Exception { | ||
| if (flatMapper instanceof RichFunction) { | ||
| ((RichFunction) flatMapper).open(parameters); | ||
| } | ||
| } | ||
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| @Override | ||
| public void close() throws Exception { | ||
| if (flatMapper instanceof RichFunction) { | ||
| ((RichFunction) flatMapper).close(); | ||
| } | ||
| } | ||
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| } |
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