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address issues in Storage API writes
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...platform/src/main/java/org/apache/beam/sdk/io/gcp/bigquery/StorageApiConvertMessages.java
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| @@ -0,0 +1,76 @@ | ||
| /* | ||
| * 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.sdk.io.gcp.bigquery; | ||
|
|
||
| import org.apache.beam.sdk.io.gcp.bigquery.StorageApiDynamicDestinations.MessageConverter; | ||
| import org.apache.beam.sdk.transforms.DoFn; | ||
| import org.apache.beam.sdk.transforms.PTransform; | ||
| import org.apache.beam.sdk.transforms.ParDo; | ||
| import org.apache.beam.sdk.values.KV; | ||
| import org.apache.beam.sdk.values.PCollection; | ||
|
|
||
| /** | ||
| * A transform that converts messages to protocol buffers in preparation for writing to BigQuery. | ||
| */ | ||
| public class StorageApiConvertMessages<DestinationT, ElementT> | ||
| extends PTransform< | ||
| PCollection<KV<DestinationT, ElementT>>, PCollection<KV<DestinationT, byte[]>>> { | ||
| private final StorageApiDynamicDestinations<ElementT, DestinationT> dynamicDestinations; | ||
|
|
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| public StorageApiConvertMessages( | ||
| StorageApiDynamicDestinations<ElementT, DestinationT> dynamicDestinations) { | ||
| this.dynamicDestinations = dynamicDestinations; | ||
| } | ||
|
|
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| @Override | ||
| public PCollection<KV<DestinationT, byte[]>> expand( | ||
| PCollection<KV<DestinationT, ElementT>> input) { | ||
| String operationName = input.getName() + "/" + getName(); | ||
|
|
||
| return input.apply( | ||
| "Convert to message", | ||
| ParDo.of(new ConvertMessagesDoFn<>(dynamicDestinations, operationName)) | ||
| .withSideInputs(dynamicDestinations.getSideInputs())); | ||
| } | ||
|
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| public static class ConvertMessagesDoFn<DestinationT, ElementT> | ||
| extends DoFn<KV<DestinationT, ElementT>, KV<DestinationT, byte[]>> { | ||
| private final StorageApiDynamicDestinations<ElementT, DestinationT> dynamicDestinations; | ||
| private TwoLevelMessageConverterCache<DestinationT, ElementT> messageConverters; | ||
|
|
||
| ConvertMessagesDoFn( | ||
| StorageApiDynamicDestinations<ElementT, DestinationT> dynamicDestinations, | ||
| String operationName) { | ||
| this.dynamicDestinations = dynamicDestinations; | ||
| this.messageConverters = new TwoLevelMessageConverterCache<>(operationName); | ||
| } | ||
|
|
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| @ProcessElement | ||
| public void processElement( | ||
| ProcessContext c, | ||
| @Element KV<DestinationT, ElementT> element, | ||
| OutputReceiver<KV<DestinationT, byte[]>> o) | ||
| throws Exception { | ||
| dynamicDestinations.setSideInputAccessorFromProcessContext(c); | ||
| MessageConverter<ElementT> messageConverter = | ||
| messageConverters.get(element.getKey(), dynamicDestinations); | ||
| o.output( | ||
| KV.of(element.getKey(), messageConverter.toMessage(element.getValue()).toByteArray())); | ||
| } | ||
| } | ||
| } |
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