flink 自定义kafka table format

创建

format唯一表示 

ddl其他配置参数存放地点 

其中可以如下定义

    public static final ConfigOption PROTOBUF_CLASS_NAME =
            ConfigOptions.key("class-name")
                    .stringType()
                    .noDefaultValue()
                    .withDescription(
                            "Optional flag to specify whether to fail if a field is missing or not, false by default.");


    @Override
    public DecodingFormat> createDecodingFormat(
            DynamicTableFactory.Context context,
            ReadableConfig formatOptions) {
        FactoryUtil.validateFactoryOptions(this, formatOptions);
        validateFormatOptions(formatOptions);

//        final boolean failonMissingField = formatOptions.get(FAIL_ON_MISSING_FIELD);
//        final boolean ignoreParseErrors = formatOptions.get(IGNORE_PARSE_ERRORS);
//        TimestampFormat timestampOption = JsonOptions.getTimestampFormat(formatOptions);

        return new DecodingFormat>() {
            @Override
            public DeserializationSchema createRuntimeDecoder(
                    DynamicTableSource.Context context,//ScanRuntimeProviderContext
                    DataType producedDataType) { // 表的字段名和数据类型
                // producedDataType ->  ROW<`live_stream_id` BIGINT, `identity_user_id` BIGINT,
                // `server_timestamp`
                //   BIGINT, `app_product` STRING> NOT NULLproducedDataType
                final RowType rowType = (RowType) producedDataType.getLogicalType();
                final TypeInformation rowDataTypeInfo =
                        context.createTypeInformation(producedDataType);
                boolean ignoreParseErrors = formatOptions.get(PROTOBUF_IGNORE_PARSEERRORS);
                boolean isCodeGen = formatOptions.get(CODE_GEN_ENABLE);
                final String className = formatOptions.get(PROTOBUF_CLASS_NAME);
                log.info("protobuf className:[{}]", className);
                log.info("producedDataType:[{}]", producedDataType);
                Class clazz;
                try {
                    // todo 根据clazz name 远程加载 Clazz
                    clazz = (Class) Class.forName(className);
                    // todo 生成代理类
                    log.info("load clazz success:[{}]", clazz);
                } catch (ClassNotFoundException e) {
                    throw new RuntimeException("class not found:" + className);
                }
                return new ProtoBufRowDataDeserializationSchema(
                        clazz, rowType, rowDataTypeInfo, ignoreParseErrors, isCodeGen
                );
            }

            @Override
            public ChangelogMode getChangelogMode() {
                return ChangelogMode.insertonly();
            }
        };
    }