org.apache.beam.fn.harness.WindowMappingFnRunner Maven / Gradle / Ivy
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* to you under the Apache License, Version 2.0 (the
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*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
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*/
package org.apache.beam.fn.harness;
import com.google.auto.service.AutoService;
import java.io.IOException;
import java.util.Map;
import org.apache.beam.model.pipeline.v1.RunnerApi.FunctionSpec;
import org.apache.beam.model.pipeline.v1.RunnerApi.PTransform;
import org.apache.beam.sdk.function.ThrowingFunction;
import org.apache.beam.sdk.transforms.windowing.BoundedWindow;
import org.apache.beam.sdk.transforms.windowing.WindowMappingFn;
import org.apache.beam.sdk.util.construction.PCollectionViewTranslation;
import org.apache.beam.sdk.util.construction.PTransformTranslation;
import org.apache.beam.sdk.values.KV;
import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableMap;
/**
* Represents mapping of main input window onto side input window.
*
* Side input window mapping function:
*
*
* - Input: {@code KV
}
* - Output: {@code KV
}
*
*
* For each main input window, the side input window is returned. The nonce is used by a runner
* to associate each input with its output. The nonce is represented as an opaque set of bytes.
*/
@SuppressWarnings({
"rawtypes" // TODO(https://github.com/apache/beam/issues/20447)
})
public class WindowMappingFnRunner {
static final String URN = PTransformTranslation.MAP_WINDOWS_TRANSFORM_URN;
/**
* A registrar which provides a factory to handle mapping main input windows onto side input
* windows.
*/
@AutoService(PTransformRunnerFactory.Registrar.class)
public static class Registrar implements PTransformRunnerFactory.Registrar {
@Override
public Map getPTransformRunnerFactories() {
return ImmutableMap.of(
URN,
MapFnRunners.forValueMapFnFactory(WindowMappingFnRunner::createMapFunctionForPTransform));
}
}
static
ThrowingFunction, KV> createMapFunctionForPTransform(
String ptransformId, PTransform pTransform) throws IOException {
FunctionSpec windowMappingFnPayload = FunctionSpec.parseFrom(pTransform.getSpec().getPayload());
WindowMappingFn windowMappingFn =
(WindowMappingFn)
PCollectionViewTranslation.windowMappingFnFromProto(windowMappingFnPayload);
return (KV input) ->
KV.of(input.getKey(), windowMappingFn.getSideInputWindow(input.getValue()));
}
}