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Completing TODO for Cassandra IOWrapper
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.../com/google/cloud/teleport/v2/source/reader/io/cassandra/iowrapper/CassandraDefaults.java
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| /* | ||
| * Copyright (C) 2025 Google LLC | ||
| * | ||
| * Licensed 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 com.google.cloud.teleport.v2.source.reader.io.cassandra.iowrapper; | ||
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| import org.apache.beam.sdk.util.FluentBackoff; | ||
| import org.joda.time.Duration; | ||
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| public class CassandraDefaults { | ||
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| /** Fluent Backoff for Cassandra Schema Discovery. */ | ||
| public static final FluentBackoff DEFAULT_CASSANDRA_SCHEMA_DISCOVERY_BACKOFF = | ||
| FluentBackoff.DEFAULT.withMaxCumulativeBackoff(Duration.standardMinutes(5L)); | ||
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| private CassandraDefaults() {} | ||
| ; | ||
| } |
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135
...ogle/cloud/teleport/v2/source/reader/io/cassandra/iowrapper/CassandraIOWrapperHelper.java
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| /* | ||
| * Copyright (C) 2025 Google LLC | ||
| * | ||
| * Licensed 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 com.google.cloud.teleport.v2.source.reader.io.cassandra.iowrapper; | ||
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| import static com.google.cloud.teleport.v2.source.reader.io.cassandra.iowrapper.CassandraDefaults.DEFAULT_CASSANDRA_SCHEMA_DISCOVERY_BACKOFF; | ||
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| import com.google.cloud.teleport.v2.source.reader.io.cassandra.schema.CassandraSchemaDiscovery; | ||
| import com.google.cloud.teleport.v2.source.reader.io.datasource.DataSource; | ||
| import com.google.cloud.teleport.v2.source.reader.io.exception.SchemaDiscoveryException; | ||
| import com.google.cloud.teleport.v2.source.reader.io.row.SourceRow; | ||
| import com.google.cloud.teleport.v2.source.reader.io.schema.SchemaDiscovery; | ||
| import com.google.cloud.teleport.v2.source.reader.io.schema.SchemaDiscoveryImpl; | ||
| import com.google.cloud.teleport.v2.source.reader.io.schema.SourceSchema; | ||
| import com.google.cloud.teleport.v2.source.reader.io.schema.SourceSchemaReference; | ||
| import com.google.cloud.teleport.v2.source.reader.io.schema.SourceTableReference; | ||
| import com.google.cloud.teleport.v2.source.reader.io.schema.SourceTableSchema; | ||
| import com.google.cloud.teleport.v2.source.reader.io.schema.typemapping.UnifiedTypeMapper.MapperType; | ||
| import com.google.cloud.teleport.v2.spanner.migrations.schema.SourceColumnType; | ||
| import com.google.common.collect.ImmutableList; | ||
| import com.google.common.collect.ImmutableMap; | ||
| import java.io.FileNotFoundException; | ||
| import java.util.List; | ||
| import org.apache.beam.sdk.transforms.PTransform; | ||
| import org.apache.beam.sdk.values.PBegin; | ||
| import org.apache.beam.sdk.values.PCollection; | ||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
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| /** Static Utility Class to provide basic functionality to {@link CassandraIoWrapper}. */ | ||
| class CassandraIOWrapperHelper { | ||
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| private static final Logger LOG = LoggerFactory.getLogger(CassandraIOWrapperHelper.class); | ||
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| static DataSource buildDataSource(String gcsPath) { | ||
| DataSource dataSource; | ||
| try { | ||
| dataSource = | ||
| DataSource.ofCassandra( | ||
| CassandraDataSource.builder().setOptionsMapFromGcsFile(gcsPath).build()); | ||
| } catch (FileNotFoundException e) { | ||
| LOG.error("Unable to find driver config file in {}. Cause ", gcsPath, e); | ||
| throw (new SchemaDiscoveryException(e)); | ||
| } | ||
| return dataSource; | ||
| } | ||
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| static SchemaDiscovery buildSchemaDiscovery() { | ||
| return new SchemaDiscoveryImpl( | ||
| new CassandraSchemaDiscovery(), DEFAULT_CASSANDRA_SCHEMA_DISCOVERY_BACKOFF); | ||
| } | ||
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| static ImmutableList<String> getTablesToRead( | ||
| List<String> sourceTables, | ||
| DataSource dataSource, | ||
| SchemaDiscovery schemaDiscovery, | ||
| SourceSchemaReference sourceSchemaReference) { | ||
| ImmutableList<String> tablesToRead; | ||
| if (sourceTables.isEmpty()) { | ||
| tablesToRead = schemaDiscovery.discoverTables(dataSource, sourceSchemaReference); | ||
| LOG.info("Auto Discovered SourceTables = {}, Tables = {}", sourceTables, tablesToRead); | ||
| } else { | ||
| tablesToRead = ImmutableList.copyOf(sourceTables); | ||
| LOG.info("Using passed SourceTables = {}", sourceTables); | ||
| } | ||
| return tablesToRead; | ||
| } | ||
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| static SourceSchema getSourceSchema( | ||
| SchemaDiscovery schemaDiscovery, | ||
| DataSource dataSource, | ||
| SourceSchemaReference sourceSchemaReference, | ||
| ImmutableList<String> tables) { | ||
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| SourceSchema.Builder sourceSchemaBuilder = | ||
| SourceSchema.builder().setSchemaReference(sourceSchemaReference); | ||
| ImmutableMap<String, ImmutableMap<String, SourceColumnType>> tableSchemas = | ||
| schemaDiscovery.discoverTableSchema(dataSource, sourceSchemaReference, tables); | ||
| LOG.info("Found table schemas: {}", tableSchemas); | ||
| tableSchemas.entrySet().stream() | ||
| .map( | ||
| tableEntry -> { | ||
| SourceTableSchema.Builder sourceTableSchemaBuilder = | ||
| SourceTableSchema.builder(MapperType.CASSANDRA).setTableName(tableEntry.getKey()); | ||
| tableEntry | ||
| .getValue() | ||
| .entrySet() | ||
| .forEach( | ||
| colEntry -> | ||
| sourceTableSchemaBuilder.addSourceColumnNameToSourceColumnType( | ||
| colEntry.getKey(), colEntry.getValue())); | ||
| return sourceTableSchemaBuilder.build(); | ||
| }) | ||
| .forEach(sourceSchemaBuilder::addTableSchema); | ||
| return sourceSchemaBuilder.build(); | ||
| } | ||
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| static ImmutableMap<SourceTableReference, PTransform<PBegin, PCollection<SourceRow>>> | ||
| getTableReaders(DataSource dataSource, SourceSchema sourceSchema) { | ||
| CassandraTableReaderFactory cassandraTableReaderFactory = new CassandraTableReaderFactory(); | ||
| ImmutableMap.Builder<SourceTableReference, PTransform<PBegin, PCollection<SourceRow>>> | ||
| tableReadersBuilder = ImmutableMap.builder(); | ||
| SourceSchemaReference sourceSchemaReference = sourceSchema.schemaReference(); | ||
| sourceSchema | ||
| .tableSchemas() | ||
| .forEach( | ||
| tableSchema -> { | ||
| SourceTableReference sourceTableReference = | ||
| SourceTableReference.builder() | ||
| .setSourceSchemaReference(sourceSchemaReference) | ||
| .setSourceTableSchemaUUID(tableSchema.tableSchemaUUID()) | ||
| .setSourceTableName(tableSchema.tableName()) | ||
| .build(); | ||
| var tableReader = | ||
| cassandraTableReaderFactory.getTableReader( | ||
| dataSource.cassandra(), sourceSchemaReference, tableSchema); | ||
| tableReadersBuilder.put(sourceTableReference, tableReader); | ||
| }); | ||
| return tableReadersBuilder.build(); | ||
| } | ||
|
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| private CassandraIOWrapperHelper() {} | ||
| } |
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