/*
* 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.beam.runners.apex.translation;
import org.apache.beam.runners.apex.translation.operators.ApexGroupByKeyOperator;
import org.apache.beam.sdk.transforms.GroupByKey;
import org.apache.beam.sdk.values.KV;
import org.apache.beam.sdk.values.PCollection;
/**
* {@link GroupByKey} translation to Apex operator.
*/
class GroupByKeyTranslator<K, V> implements TransformTranslator<GroupByKey<K, V>> {
private static final long serialVersionUID = 1L;
@Override
public void translate(GroupByKey<K, V> transform, TranslationContext context) {
PCollection<KV<K, V>> input = context.getInput();
ApexGroupByKeyOperator<K, V> group = new ApexGroupByKeyOperator<>(context.getPipelineOptions(),
input, context.getStateBackend()
);
context.addOperator(group, group.output);
context.addStream(input, group.input);
}
}