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[RRIO] [Cache] Stub CacheRead transform (apache#29011)
* Stub CacheRead * Run spotlessApply
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sdks/java/io/rrio/src/main/java/org/apache/beam/io/requestresponseio/CacheRead.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.beam.io.requestresponseio; | ||
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import com.google.auto.value.AutoValue; | ||
import java.util.Map; | ||
import org.apache.beam.io.requestresponseio.CacheRead.Result; | ||
import org.apache.beam.sdk.Pipeline; | ||
import org.apache.beam.sdk.transforms.PTransform; | ||
import org.apache.beam.sdk.values.KV; | ||
import org.apache.beam.sdk.values.PCollection; | ||
import org.apache.beam.sdk.values.PCollectionTuple; | ||
import org.apache.beam.sdk.values.PInput; | ||
import org.apache.beam.sdk.values.POutput; | ||
import org.apache.beam.sdk.values.PValue; | ||
import org.apache.beam.sdk.values.TupleTag; | ||
import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableMap; | ||
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/** | ||
* {@link CacheRead} reads associated {@link ResponseT} types from {@link RequestT} types, if any | ||
* exist. | ||
*/ | ||
class CacheRead<RequestT, ResponseT> | ||
extends PTransform<PCollection<RequestT>, Result<RequestT, ResponseT>> { | ||
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private static final TupleTag<ApiIOError> FAILURE_TAG = new TupleTag<ApiIOError>() {}; | ||
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// TODO(damondouglas): remove suppress warnings after instance utilized. | ||
@SuppressWarnings({"unused"}) | ||
private final Configuration<RequestT, ResponseT> configuration; | ||
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private CacheRead(Configuration<RequestT, ResponseT> configuration) { | ||
this.configuration = configuration; | ||
} | ||
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/** Configuration details for {@link CacheRead}. */ | ||
@AutoValue | ||
abstract static class Configuration<RequestT, ResponseT> { | ||
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static <RequestT, ResponseT> Builder<RequestT, ResponseT> builder() { | ||
return new AutoValue_CacheRead_Configuration.Builder<>(); | ||
} | ||
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abstract Builder<RequestT, ResponseT> toBuilder(); | ||
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@AutoValue.Builder | ||
abstract static class Builder<RequestT, ResponseT> { | ||
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abstract Configuration<RequestT, ResponseT> build(); | ||
} | ||
} | ||
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@Override | ||
public Result<RequestT, ResponseT> expand(PCollection<RequestT> input) { | ||
return Result.of( | ||
new TupleTag<KV<RequestT, ResponseT>>() {}, PCollectionTuple.empty(input.getPipeline())); | ||
} | ||
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/** | ||
* The {@link Result} of reading RequestT {@link PCollection} elements yielding ResponseT {@link | ||
* PCollection} elements. | ||
*/ | ||
static class Result<RequestT, ResponseT> implements POutput { | ||
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static <RequestT, ResponseT> Result<RequestT, ResponseT> of( | ||
TupleTag<KV<RequestT, ResponseT>> responseTag, PCollectionTuple pct) { | ||
return new Result<>(responseTag, pct); | ||
} | ||
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private final Pipeline pipeline; | ||
private final TupleTag<KV<RequestT, ResponseT>> responseTag; | ||
private final PCollection<KV<RequestT, ResponseT>> responses; | ||
private final PCollection<ApiIOError> failures; | ||
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private Result(TupleTag<KV<RequestT, ResponseT>> responseTag, PCollectionTuple pct) { | ||
this.pipeline = pct.getPipeline(); | ||
this.responseTag = responseTag; | ||
this.responses = pct.get(responseTag); | ||
this.failures = pct.get(FAILURE_TAG); | ||
} | ||
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PCollection<KV<RequestT, ResponseT>> getResponses() { | ||
return responses; | ||
} | ||
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PCollection<ApiIOError> getFailures() { | ||
return failures; | ||
} | ||
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@Override | ||
public Pipeline getPipeline() { | ||
return this.pipeline; | ||
} | ||
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@Override | ||
public Map<TupleTag<?>, PValue> expand() { | ||
return ImmutableMap.of( | ||
responseTag, responses, | ||
FAILURE_TAG, failures); | ||
} | ||
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@Override | ||
public void finishSpecifyingOutput( | ||
String transformName, PInput input, PTransform<?, ?> transform) {} | ||
} | ||
} |