purbanow commented on a change in pull request #11794:
URL: https://github.com/apache/beam/pull/11794#discussion_r433114311
##########
File path:
sdks/java/io/snowflake/src/main/java/org/apache/beam/sdk/io/snowflake/SnowflakeIO.java
##########
@@ -447,6 +494,346 @@ public void populateDisplayData(DisplayData.Builder
builder) {
}
}
+ /** Implementation of {@link #write()}. */
+ @AutoValue
+ public abstract static class Write<T> extends PTransform<PCollection<T>,
PDone> {
+ @Nullable
+ abstract SerializableFunction<Void, DataSource> getDataSourceProviderFn();
+
+ @Nullable
+ abstract String getTable();
+
+ @Nullable
+ abstract String getQuery();
+
+ @Nullable
+ abstract Location getLocation();
+
+ @Nullable
+ abstract String getFileNameTemplate();
+
+ @Nullable
+ abstract WriteDisposition getWriteDisposition();
+
+ @Nullable
+ abstract UserDataMapper getUserDataMapper();
+
+ @Nullable
+ abstract SnowflakeService getSnowflakeService();
+
+ abstract Builder<T> toBuilder();
+
+ @AutoValue.Builder
+ abstract static class Builder<T> {
+ abstract Builder<T> setDataSourceProviderFn(
+ SerializableFunction<Void, DataSource> dataSourceProviderFn);
+
+ abstract Builder<T> setTable(String table);
+
+ abstract Builder<T> setQuery(String query);
+
+ abstract Builder<T> setLocation(Location location);
+
+ abstract Builder<T> setFileNameTemplate(String fileNameTemplate);
+
+ abstract Builder<T> setUserDataMapper(UserDataMapper userDataMapper);
+
+ abstract Builder<T> setWriteDisposition(WriteDisposition
writeDisposition);
+
+ abstract Builder<T> setSnowflakeService(SnowflakeService
snowflakeService);
+
+ abstract Write<T> build();
+ }
+
+ /**
+ * Setting information about Snowflake server.
+ *
+ * @param config - An instance of {@link DataSourceConfiguration}.
+ */
+ public Write<T> withDataSourceConfiguration(final DataSourceConfiguration
config) {
+ return withDataSourceProviderFn(new
DataSourceProviderFromDataSourceConfiguration(config));
+ }
+
+ /**
+ * Setting function that will provide {@link DataSourceConfiguration} in
runtime.
+ *
+ * @param dataSourceProviderFn a {@link SerializableFunction}.
+ */
+ public Write<T> withDataSourceProviderFn(
+ SerializableFunction<Void, DataSource> dataSourceProviderFn) {
+ return toBuilder().setDataSourceProviderFn(dataSourceProviderFn).build();
+ }
+
+ /**
+ * A table name to be written in Snowflake.
+ *
+ * @param table - String with the name of the table.
+ */
+ public Write<T> to(String table) {
+ return toBuilder().setTable(table).build();
+ }
+
+ /**
+ * A query to be executed in Snowflake.
+ *
+ * @param query - String with query.
+ */
+ public Write<T> withQueryTransformation(String query) {
+ return toBuilder().setQuery(query).build();
+ }
+
+ /**
+ * A location object which contains connection config between Snowflake
and GCP.
+ *
+ * @param location - an instance of {@link Location}.
+ */
+ public Write<T> via(Location location) {
+ return toBuilder().setLocation(location).build();
+ }
+
+ /**
+ * A template name for files saved to GCP.
+ *
+ * @param fileNameTemplate - String with template name for files.
+ */
+ public Write<T> withFileNameTemplate(String fileNameTemplate) {
+ return toBuilder().setFileNameTemplate(fileNameTemplate).build();
+ }
+
+ /**
+ * User-defined function mapping user data into CSV lines.
+ *
+ * @param userDataMapper - an instance of {@link UserDataMapper}.
+ */
+ public Write<T> withUserDataMapper(UserDataMapper userDataMapper) {
+ return toBuilder().setUserDataMapper(userDataMapper).build();
+ }
+
+ /**
+ * A disposition to be used during writing to table phase.
+ *
+ * @param writeDisposition - an instance of {@link WriteDisposition}.
+ */
+ public Write<T> withWriteDisposition(WriteDisposition writeDisposition) {
+ return toBuilder().setWriteDisposition(writeDisposition).build();
+ }
+
+ /**
+ * A snowflake service which is supposed to be used. Note: Currently we
have {@link
+ * SnowflakeServiceImpl} with corresponding {@link
FakeSnowflakeServiceImpl} used for testing.
+ *
+ * @param snowflakeService - an instance of {@link SnowflakeService}.
+ */
+ public Write<T> withSnowflakeService(SnowflakeService snowflakeService) {
+ return toBuilder().setSnowflakeService(snowflakeService).build();
+ }
+
+ @Override
+ public PDone expand(PCollection<T> input) {
+ Location loc = getLocation();
+ checkArguments(loc);
+
+ String stagingBucketDir = String.format("%s/%s/",
loc.getStagingBucketName(), WRITE_TMP_PATH);
+
+ PCollection out = write(input, stagingBucketDir);
+ out.setCoder(StringUtf8Coder.of());
+
+ return PDone.in(out.getPipeline());
+ }
+
+ private void checkArguments(Location loc) {
+ checkArgument(loc != null, "via() is required");
+ checkArgument(
+ loc.getStorageIntegrationName() != null,
+ "location with storageIntegrationName is required");
+ checkArgument(
+ loc.getStagingBucketName() != null, "location with stagingBucketName
is required");
+
+ checkArgument(getUserDataMapper() != null, "withUserDataMapper() is
required");
+
+ checkArgument(
+ (getDataSourceProviderFn() != null),
+ "withDataSourceConfiguration() or withDataSourceProviderFn() is
required");
+
+ checkArgument(getTable() != null, "withTable() is required");
+ }
+
+ private PCollection write(PCollection input, String stagingBucketDir) {
+ SnowflakeService snowflakeService =
+ getSnowflakeService() != null ? getSnowflakeService() : new
SnowflakeServiceImpl();
+
+ PCollection files = writeFiles(input, stagingBucketDir);
+
+ files =
+ (PCollection)
+ files.apply("Create list of files to copy", Combine.globally(new
Concatenate()));
+
+ return (PCollection)
+ files.apply("Copy files to table", copyToTable(snowflakeService,
stagingBucketDir));
+ }
+
+ private PCollection writeFiles(PCollection<T> input, String
stagingBucketDir) {
+ class Parse extends DoFn<KV<T, String>, String> {
+ @ProcessElement
+ public void processElement(ProcessContext c) {
+ c.output(c.element().getValue());
+ }
+ }
+
+ PCollection mappedUserData =
+ input
+ .apply(
+ "Map user data to Objects array",
+ ParDo.of(new
MapUserDataObjectsArrayFn<T>(getUserDataMapper())))
+ .apply("Map Objects array to CSV lines", ParDo.of(new
MapObjectsArrayToCsvFn()))
+ .setCoder(StringUtf8Coder.of());
+
+ WriteFilesResult filesResult =
+ (WriteFilesResult)
+ mappedUserData.apply(
+ "Write files to specified location",
+ FileIO.write()
+ .via((FileIO.Sink) new CSVSink())
+ .to(stagingBucketDir)
+ .withPrefix(getFileNameTemplate())
+ .withSuffix(".csv")
+ .withPrefix(UUID.randomUUID().toString().subSequence(0,
8).toString())
+ .withCompression(Compression.GZIP));
+
+ return (PCollection)
+ filesResult
+ .getPerDestinationOutputFilenames()
+ .apply("Parse KV filenames to Strings", ParDo.of(new Parse()));
+ }
+
+ private ParDo.SingleOutput<Object, Object> copyToTable(
+ SnowflakeService snowflakeService, String stagingBucketDir) {
+ return ParDo.of(
+ new CopyToTableFn<>(
+ getDataSourceProviderFn(),
+ getTable(),
+ getQuery(),
+ stagingBucketDir,
+ getLocation(),
+ getWriteDisposition(),
+ snowflakeService));
+ }
+ }
+
+ public static class Concatenate extends Combine.CombineFn<String,
List<String>, List<String>> {
+ @Override
+ public List<String> createAccumulator() {
+ return new ArrayList<>();
+ }
+
+ @Override
+ public List<String> addInput(List<String> mutableAccumulator, String
input) {
+ mutableAccumulator.add(String.format("'%s'", input));
+ return mutableAccumulator;
+ }
+
+ @Override
+ public List<String> mergeAccumulators(Iterable<List<String>> accumulators)
{
+ List<String> result = createAccumulator();
+ for (List<String> accumulator : accumulators) {
+ result.addAll(accumulator);
+ }
+ return result;
+ }
+
+ @Override
+ public List<String> extractOutput(List<String> accumulator) {
+ return accumulator;
+ }
+ }
+
+ private static class MapUserDataObjectsArrayFn<T> extends DoFn<T, Object[]> {
Review comment:
Thanks, I changed to `MapElements.via` with `SimpleFunction`
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