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[RRIO] [Throttle] Stub throttle without external transform (#29059)
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damondouglas authored Oct 23, 2023
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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.beam.io.requestresponse;

import com.google.auto.value.AutoValue;
import org.apache.beam.sdk.transforms.PTransform;
import org.apache.beam.sdk.values.PCollection;

/**
* {@link ThrottleWithoutExternalResource} throttles a {@link RequestT} {@link PCollection} emitting
* a {@link RequestT} {@link PCollection} at a maximally configured rate, without using an external
* resource.
*/
// TODO(damondouglas): expand what "without external resource" means with respect to "with external
// resource" when the other throttle transforms implemented.
// See: https://github.com/apache/beam/issues/28932
class ThrottleWithoutExternalResource<RequestT>
extends PTransform<PCollection<RequestT>, PCollection<RequestT>> {

// TODO(damondouglas): remove suppress warnings when finally utilized in a future PR.
@SuppressWarnings({"unused"})
private final Configuration<RequestT> configuration;

private ThrottleWithoutExternalResource(Configuration<RequestT> configuration) {
this.configuration = configuration;
}

@Override
public PCollection<RequestT> expand(PCollection<RequestT> input) {
// TODO(damondouglas): expand in a future PR.
return input;
}

@AutoValue
abstract static class Configuration<RequestT> {

@AutoValue.Builder
abstract static class Builder<RequestT> {
abstract Configuration<RequestT> build();
}
}
}

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