sdks/java/io/jdbc/src/main/java/org/apache/beam/sdk/io/jdbc/JdbcWriteRegistrar.java

/*
 * 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.jdbc;

import com.google.auto.service.AutoService;
import java.util.Map;
import org.apache.beam.sdk.annotations.Experimental;
import org.apache.beam.sdk.annotations.Experimental.Kind;
import org.apache.beam.sdk.expansion.ExternalTransformRegistrar;
import org.apache.beam.sdk.io.jdbc.JdbcIO.DataSourceConfiguration;
import org.apache.beam.sdk.transforms.ExternalTransformBuilder;
import org.apache.beam.sdk.transforms.PTransform;
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;

/** Exposes {@link JdbcIO.Write} as an external transform for cross-language usage. */
@Experimental(Kind.PORTABILITY)
@AutoService(ExternalTransformRegistrar.class)
public class JdbcWriteRegistrar implements ExternalTransformRegistrar {

  public static final String URN = "beam:external:java:jdbc:write:v1";

  @Override
  public Map<String, Class<? extends ExternalTransformBuilder<?, ?, ?>>> knownBuilders() {
    return ImmutableMap.of(URN, JdbcWriteRegistrar.Builder.class);
  }

  /** Parameters class to expose the Write transform to an external SDK. */
  public static class WriteConfiguration extends CrossLanguageConfiguration {
    private String statement;

    public void setStatement(String statement) {
      this.statement = statement;
    }
  }

  public static class Builder
      implements ExternalTransformBuilder<WriteConfiguration, PCollection<Row>, PDone> {
    @Override
    public PTransform<PCollection<Row>, PDone> buildExternal(WriteConfiguration configuration) {
      DataSourceConfiguration dataSourceConfiguration = configuration.getDataSourceConfiguration();

      // TODO: BEAM-10396 use writeRows() when it's available
      return JdbcIO.<Row>write()
          .withDataSourceConfiguration(dataSourceConfiguration)
          .withStatement(configuration.statement)
          .withPreparedStatementSetter(new JdbcUtil.BeamRowPreparedStatementSetter());
    }
  }
}