sclukas77 commented on a change in pull request #12498: URL: https://github.com/apache/beam/pull/12498#discussion_r468718975
########## File path: sdks/java/extensions/schemaio-expansion-service/src/main/java/org/apache/beam/sdk/extensions/schemaio/expansion/ExternalSchemaIOTransformRegistrar.java ########## @@ -0,0 +1,142 @@ +/* + * 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.extensions.schemaio.expansion; + +import com.google.auto.service.AutoService; +import java.io.ByteArrayInputStream; +import java.io.InputStream; +import java.util.Map; +import java.util.ServiceLoader; +import javax.annotation.Nullable; +import org.apache.beam.model.pipeline.v1.SchemaApi; +import org.apache.beam.sdk.annotations.Experimental; +import org.apache.beam.sdk.coders.RowCoder; +import org.apache.beam.sdk.expansion.ExternalTransformRegistrar; +import org.apache.beam.sdk.schemas.Schema; +import org.apache.beam.sdk.schemas.SchemaTranslation; +import org.apache.beam.sdk.schemas.io.SchemaIOProvider; +import org.apache.beam.sdk.transforms.ExternalTransformBuilder; +import org.apache.beam.sdk.transforms.PTransform; +import org.apache.beam.sdk.values.PBegin; +import org.apache.beam.sdk.values.PCollection; +import org.apache.beam.sdk.values.PDone; +import org.apache.beam.sdk.values.Row; +import org.apache.beam.vendor.guava.v26_0_jre.com.google.common.collect.ImmutableMap; + +@Experimental(Experimental.Kind.PORTABILITY) +@AutoService(ExternalTransformRegistrar.class) +public class ExternalSchemaIOTransformRegistrar implements ExternalTransformRegistrar { + + @Override + public Map<String, ExternalTransformBuilder<?, ?, ?>> knownBuilderInstances() { + ImmutableMap.Builder builder = ImmutableMap.<String, ExternalTransformRegistrar>builder(); + try { + for (SchemaIOProvider schemaIOProvider : ServiceLoader.load(SchemaIOProvider.class)) { + builder.put( + "beam:external:java:" + schemaIOProvider.identifier() + ":read:v1", + new ReaderBuilder(schemaIOProvider)); + builder.put( + "beam:external:java:" + schemaIOProvider.identifier() + ":write:v1", + new WriterBuilder(schemaIOProvider)); + } + } catch (Exception e) { + throw new RuntimeException(e.getMessage()); + } + return builder.build(); + } + + public static class Configuration { + String location = ""; + byte[] config = new byte[0]; + @Nullable byte[] dataSchema = null; + + public void setLocation(String location) { + this.location = location; + } + + public void setConfig(byte[] config) { + this.config = config; + } + + public void setDataSchema(byte[] dataSchema) { + this.dataSchema = dataSchema; + } + } + + @Nullable + private static Schema translateSchema(@Nullable byte[] schemaBytes) throws Exception { + if (schemaBytes == null) { + return null; + } + SchemaApi.Schema protoSchema = SchemaApi.Schema.parseFrom(schemaBytes); + return SchemaTranslation.schemaFromProto(protoSchema); + } + + private static Row translateRow(byte[] rowBytes, Schema configSchema) throws Exception { + RowCoder rowCoder = RowCoder.of(configSchema); + InputStream stream = new ByteArrayInputStream(rowBytes); + return rowCoder.decode(stream); + } + + private static class ReaderBuilder + implements ExternalTransformBuilder<Configuration, PBegin, PCollection<Row>> { + SchemaIOProvider schemaIOProvider; + + ReaderBuilder(SchemaIOProvider schemaIOProvider) { + this.schemaIOProvider = schemaIOProvider; + } + + @Override + public PTransform<PBegin, PCollection<Row>> buildExternal(Configuration configuration) { + try { + return schemaIOProvider + .from( + configuration.location, + translateRow(configuration.config, schemaIOProvider.configurationSchema()), + translateSchema(configuration.dataSchema)) + .buildReader(); + } catch (Exception e) { + throw new RuntimeException("Could not convert configuration proto to row or schema."); + } + } + } + + private static class WriterBuilder + implements ExternalTransformBuilder<Configuration, PCollection<Row>, PDone> { + SchemaIOProvider schemaIOProvider; + + WriterBuilder(SchemaIOProvider schemaIOProvider) { + this.schemaIOProvider = schemaIOProvider; + } + + @Override + public PTransform<PCollection<Row>, PDone> buildExternal(Configuration configuration) { + try { + return (PTransform<PCollection<Row>, PDone>) + schemaIOProvider + .from( + configuration.location, + translateRow(configuration.config, schemaIOProvider.configurationSchema()), + translateSchema(configuration.dataSchema)) + .buildWriter(); + } catch (Exception e) { + throw new RuntimeException("Could not convert configuration proto to row or schema."); Review comment: Done ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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