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[BEAM-11482] Thrift support for KafkaTableProvider (apache#13572)
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132 changes: 132 additions & 0 deletions
132
sdks/java/core/src/main/java/org/apache/beam/sdk/schemas/RowMessages.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,132 @@ | ||
| /* | ||
| * 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.schemas; | ||
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| import static org.apache.beam.sdk.util.Preconditions.checkArgumentNotNull; | ||
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| import java.io.ByteArrayInputStream; | ||
| import java.io.ByteArrayOutputStream; | ||
| import java.io.IOException; | ||
| import org.apache.beam.sdk.annotations.Internal; | ||
| import org.apache.beam.sdk.coders.Coder; | ||
| import org.apache.beam.sdk.transforms.ProcessFunction; | ||
| import org.apache.beam.sdk.transforms.SerializableFunction; | ||
| import org.apache.beam.sdk.transforms.SimpleFunction; | ||
| import org.apache.beam.sdk.values.Row; | ||
| import org.apache.beam.sdk.values.TypeDescriptor; | ||
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|
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| @Internal | ||
| public final class RowMessages { | ||
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| private RowMessages() {} | ||
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| public static <T> SimpleFunction<byte[], Row> bytesToRowFn( | ||
| SchemaProvider schemaProvider, | ||
| TypeDescriptor<T> typeDescriptor, | ||
| ProcessFunction<byte[], ? extends T> fromBytesFn) { | ||
| final SerializableFunction<T, Row> toRowFn = | ||
| checkArgumentNotNull(schemaProvider.toRowFunction(typeDescriptor)); | ||
| return new BytesToRowFn<>(fromBytesFn, toRowFn); | ||
| } | ||
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| public static <T> SimpleFunction<byte[], Row> bytesToRowFn( | ||
| SchemaProvider schemaProvider, TypeDescriptor<T> typeDescriptor, Coder<? extends T> coder) { | ||
| return bytesToRowFn( | ||
| schemaProvider, typeDescriptor, bytes -> coder.decode(new ByteArrayInputStream(bytes))); | ||
| } | ||
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| private static final class BytesToRowFn<T> extends SimpleFunction<byte[], Row> { | ||
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| private final ProcessFunction<byte[], ? extends T> fromBytesFn; | ||
| private final SerializableFunction<T, Row> toRowFn; | ||
|
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| private BytesToRowFn( | ||
| ProcessFunction<byte[], ? extends T> fromBytesFn, SerializableFunction<T, Row> toRowFn) { | ||
| this.fromBytesFn = fromBytesFn; | ||
| this.toRowFn = toRowFn; | ||
| } | ||
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| @Override | ||
| public Row apply(byte[] bytes) { | ||
| final T message; | ||
| try { | ||
| message = fromBytesFn.apply(bytes); | ||
| } catch (Exception e) { | ||
| throw new IllegalStateException("Could not decode bytes as message", e); | ||
| } | ||
| return toRowFn.apply(message); | ||
| } | ||
| } | ||
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| public static <T> SimpleFunction<Row, byte[]> rowToBytesFn( | ||
| SchemaProvider schemaProvider, | ||
| TypeDescriptor<T> typeDescriptor, | ||
| ProcessFunction<? super T, byte[]> toBytesFn) { | ||
| final Schema schema = checkArgumentNotNull(schemaProvider.schemaFor(typeDescriptor)); | ||
| final SerializableFunction<Row, T> fromRowFn = | ||
| checkArgumentNotNull(schemaProvider.fromRowFunction(typeDescriptor)); | ||
| toBytesFn = checkArgumentNotNull(toBytesFn); | ||
| return new RowToBytesFn<>(schema, fromRowFn, toBytesFn); | ||
| } | ||
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| public static <T> SimpleFunction<Row, byte[]> rowToBytesFn( | ||
| SchemaProvider schemaProvider, TypeDescriptor<T> typeDescriptor, Coder<? super T> coder) { | ||
| return rowToBytesFn(schemaProvider, typeDescriptor, message -> toBytes(coder, message)); | ||
| } | ||
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| private static <T> byte[] toBytes(Coder<? super T> coder, T message) throws IOException { | ||
| final ByteArrayOutputStream out = new ByteArrayOutputStream(); | ||
| coder.encode(message, out); | ||
| return out.toByteArray(); | ||
| } | ||
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| private static final class RowToBytesFn<T> extends SimpleFunction<Row, byte[]> { | ||
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| private final Schema schema; | ||
| private final SerializableFunction<Row, T> fromRowFn; | ||
| private final ProcessFunction<? super T, byte[]> toBytesFn; | ||
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| private RowToBytesFn( | ||
| Schema schema, | ||
| SerializableFunction<Row, T> fromRowFn, | ||
| ProcessFunction<? super T, byte[]> toBytesFn) { | ||
| this.schema = schema; | ||
| this.fromRowFn = fromRowFn; | ||
| this.toBytesFn = toBytesFn; | ||
| } | ||
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| @Override | ||
| public byte[] apply(Row row) { | ||
| if (!schema.equivalent(row.getSchema())) { | ||
| row = switchFieldsOrder(row); | ||
| } | ||
| final T message = fromRowFn.apply(row); | ||
| try { | ||
| return toBytesFn.apply(message); | ||
| } catch (Exception e) { | ||
| throw new IllegalStateException("Could not encode message as bytes", e); | ||
| } | ||
| } | ||
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| private Row switchFieldsOrder(Row row) { | ||
| Row.Builder convertedRow = Row.withSchema(schema); | ||
| schema.getFields().forEach(field -> convertedRow.addValue(row.getValue(field.getName()))); | ||
| return convertedRow.build(); | ||
| } | ||
| } | ||
| } |
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