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dbeam-core/src/main/java/com/spotify/dbeam/avro/JdbcAvroRecordConverter.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,120 @@ | ||
| /*- | ||
| * -\-\- | ||
| * DBeam Core | ||
| * -- | ||
| * Copyright (C) 2016 - 2019 Spotify AB | ||
| * -- | ||
| * 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.spotify.dbeam.avro; | ||
|
|
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| import java.io.ByteArrayOutputStream; | ||
| import java.io.IOException; | ||
| import java.nio.ByteBuffer; | ||
| import java.sql.ResultSet; | ||
| import java.sql.ResultSetMetaData; | ||
| import java.sql.SQLException; | ||
|
|
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| import org.apache.avro.io.BinaryEncoder; | ||
| import org.apache.avro.io.EncoderFactory; | ||
|
|
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| public class JdbcAvroRecordConverter { | ||
| private final JdbcAvroRecord.SqlFunction<ResultSet, Object>[] mappings; | ||
| private final int columnCount; | ||
| private final ResultSet resultSet; | ||
| private final EncoderFactory encoderFactory = EncoderFactory.get(); | ||
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|
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| public JdbcAvroRecordConverter( | ||
| JdbcAvroRecord.SqlFunction<ResultSet, Object>[] mappings, int columnCount, | ||
| ResultSet resultSet) { | ||
| this.mappings = mappings; | ||
| this.columnCount = columnCount; | ||
| this.resultSet = resultSet; | ||
| } | ||
|
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| public static JdbcAvroRecordConverter create(ResultSet resultSet) | ||
| throws SQLException { | ||
| return new JdbcAvroRecordConverter( | ||
| computeAllMappings(resultSet), | ||
| resultSet.getMetaData().getColumnCount(), | ||
| resultSet); | ||
| } | ||
|
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| @SuppressWarnings("unchecked") | ||
| static JdbcAvroRecord.SqlFunction<ResultSet, Object>[] computeAllMappings(ResultSet resultSet) | ||
| throws SQLException { | ||
| final ResultSetMetaData meta = resultSet.getMetaData(); | ||
| final int columnCount = meta.getColumnCount(); | ||
|
|
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| final JdbcAvroRecord.SqlFunction<ResultSet, Object>[] mappings = | ||
| new JdbcAvroRecord.SqlFunction[columnCount + 1]; | ||
|
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| for (int i = 1; i <= columnCount; i++) { | ||
| mappings[i] = JdbcAvroRecord.computeMapping(meta, i); | ||
| } | ||
| return mappings; | ||
| } | ||
|
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| private BinaryEncoder binaryEncoder = null; | ||
|
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| public static class MyByteArrayOutputStream extends ByteArrayOutputStream { | ||
|
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| MyByteArrayOutputStream(int size) { | ||
| super(size); | ||
| } | ||
|
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| // provide access to internal buffer, avoiding copy | ||
| byte[] getBufffer() { | ||
| return buf; | ||
| } | ||
| } | ||
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| /** | ||
| * Read data from a single row of result set and and encode into a Avro record as byte array. | ||
| * Directly reading and encoding has the benefit of less need for copying bytes between objects. | ||
| */ | ||
| public ByteBuffer convertResultSetIntoAvroBytes() | ||
| throws SQLException, IOException { | ||
| final MyByteArrayOutputStream out = new MyByteArrayOutputStream(columnCount * 64); | ||
| binaryEncoder = encoderFactory.directBinaryEncoder(out, binaryEncoder); | ||
| for (int i = 1; i <= columnCount; i++) { | ||
| final Object value = mappings[i].apply(resultSet); | ||
| if (value == null || resultSet.wasNull()) { | ||
| binaryEncoder.writeIndex(0); | ||
| binaryEncoder.writeNull(); | ||
| } else { | ||
| binaryEncoder.writeIndex(1); | ||
| if (value instanceof String) { | ||
| binaryEncoder.writeString((String) value); | ||
| } else if (value instanceof Long) { | ||
| binaryEncoder.writeLong((Long) value); | ||
| } else if (value instanceof Integer) { | ||
| binaryEncoder.writeInt((Integer) value); | ||
| } else if (value instanceof Boolean) { | ||
| binaryEncoder.writeBoolean((Boolean) value); | ||
| } else if (value instanceof ByteBuffer) { | ||
| binaryEncoder.writeBytes((ByteBuffer) value); | ||
| } else if (value instanceof Double) { | ||
| binaryEncoder.writeDouble((Double) value); | ||
| } else if (value instanceof Float) { | ||
| binaryEncoder.writeFloat((Float) value); | ||
| } | ||
| } | ||
| } | ||
| binaryEncoder.flush(); | ||
| return ByteBuffer.wrap(out.getBufffer()); | ||
| } | ||
|
|
||
| } |
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