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[improve] adjust the code framework related to CDC. (apache#319)
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...c/main/java/org/apache/doris/flink/sink/writer/serializer/jsondebezium/CdcDataChange.java
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| // 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. | ||
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| package org.apache.doris.flink.sink.writer.serializer.jsondebezium; | ||
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| import com.fasterxml.jackson.databind.JsonNode; | ||
| import org.apache.doris.flink.sink.writer.ChangeEvent; | ||
| import org.apache.doris.flink.sink.writer.serializer.DorisRecord; | ||
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| import java.io.IOException; | ||
| import java.util.Map; | ||
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| /** | ||
| * When cdc connector captures data changes from the source database you need to inherit this class | ||
| * to complete the synchronized data changes to Doris schema. Supports data messages serialized to | ||
| * json | ||
| */ | ||
| public abstract class CdcDataChange implements ChangeEvent { | ||
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| protected abstract DorisRecord serialize(String record, JsonNode recordRoot, String op) | ||
| throws IOException; | ||
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| protected abstract Map<String, Object> extractBeforeRow(JsonNode record); | ||
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| protected abstract Map<String, Object> extractAfterRow(JsonNode record); | ||
| } |
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...main/java/org/apache/doris/flink/sink/writer/serializer/jsondebezium/CdcSchemaChange.java
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| @@ -0,0 +1,39 @@ | ||
| // 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. | ||
|
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| package org.apache.doris.flink.sink.writer.serializer.jsondebezium; | ||
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| import com.fasterxml.jackson.databind.JsonNode; | ||
| import org.apache.doris.flink.sink.writer.ChangeEvent; | ||
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| import java.io.IOException; | ||
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| /** | ||
| * When cdc connector captures data changes about source database schema changes, you need to | ||
| * inherit this class to complete the synchronized changes to Doris schema. Supports data messages | ||
| * serialized to json | ||
| */ | ||
| public abstract class CdcSchemaChange implements ChangeEvent { | ||
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| protected abstract String extractDatabase(JsonNode record); | ||
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| protected abstract String extractTable(JsonNode record); | ||
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| public abstract boolean schemaChange(JsonNode recordRoot) throws IOException; | ||
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| protected abstract String getCdcTableIdentifier(JsonNode record); | ||
| } |
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71 changes: 71 additions & 0 deletions
71
flink-doris-connector/src/main/java/org/apache/doris/flink/tools/cdc/JdbcSourceSchema.java
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| @@ -0,0 +1,71 @@ | ||
| // 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. | ||
|
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| package org.apache.doris.flink.tools.cdc; | ||
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| import org.apache.doris.flink.catalog.doris.FieldSchema; | ||
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| import java.sql.DatabaseMetaData; | ||
| import java.sql.ResultSet; | ||
| import java.util.ArrayList; | ||
| import java.util.LinkedHashMap; | ||
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| /** | ||
| * JdbcSourceSchema is a subclass of SourceSchema, used to build metadata about jdbc-related | ||
| * databases. | ||
| */ | ||
| public abstract class JdbcSourceSchema extends SourceSchema { | ||
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| public JdbcSourceSchema( | ||
| DatabaseMetaData metaData, | ||
| String databaseName, | ||
| String schemaName, | ||
| String tableName, | ||
| String tableComment) | ||
| throws Exception { | ||
| super(databaseName, schemaName, tableName, tableComment); | ||
| fields = new LinkedHashMap<>(); | ||
| try (ResultSet rs = metaData.getColumns(databaseName, schemaName, tableName, null)) { | ||
| while (rs.next()) { | ||
| String fieldName = rs.getString("COLUMN_NAME"); | ||
| String comment = rs.getString("REMARKS"); | ||
| String fieldType = rs.getString("TYPE_NAME"); | ||
| Integer precision = rs.getInt("COLUMN_SIZE"); | ||
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| if (rs.wasNull()) { | ||
| precision = null; | ||
| } | ||
| Integer scale = rs.getInt("DECIMAL_DIGITS"); | ||
| if (rs.wasNull()) { | ||
| scale = null; | ||
| } | ||
| String dorisTypeStr = convertToDorisType(fieldType, precision, scale); | ||
| fields.put(fieldName, new FieldSchema(fieldName, dorisTypeStr, comment)); | ||
| } | ||
| } | ||
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| primaryKeys = new ArrayList<>(); | ||
| try (ResultSet rs = metaData.getPrimaryKeys(databaseName, schemaName, tableName)) { | ||
| while (rs.next()) { | ||
| String fieldName = rs.getString("COLUMN_NAME"); | ||
| primaryKeys.add(fieldName); | ||
| } | ||
| } | ||
| } | ||
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| public abstract String convertToDorisType(String fieldType, Integer precision, Integer scale); | ||
| } |
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