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Avro Loading Topic

Configuration Properties

Properties for an Avro Loading Topic are defined by name in the dlc.avro.topics namespace, and are picked up as configurations for the DLC.

Key Required Type Default Description
file-pattern String Path matcher.
schema-path String Path to schema.
columns List<String> Columns will implicitly come from the store which is being published to. The order of columns in the file. If a column name matches a datastore column, its parser will be implied. For columns that do not match a datastore column, you must provide a parser in the channel as a Custom Field. Columns without a matching datastore column or parser are skipped.
channels Set<Channel> A channel is created using the topic’s name as the name of the target. Channels.
restrict-to-sources Set<String> Sources to which the topic is restricted. See source to topic matching.
restrict-from-sources Set<String> Sources from which the topic restricted. See source to topic matching.

YAML Example

This configuration does not specify a target for the data.

note

If you do not name your topic the same as your store you will have to explicitly specify the target in the channel of the topic.

  • The target is implicitly the Atoti table named “Trades”.
  • The format comes from the schema file specified in the configuration.
dlc:
  avro:
    topics:
      Trades:
        file-pattern: glob:trades*.avro
        schema-path: schemas/schema.avsc

Java Configuration

AvroTopicDescription Spring Beans are picked up as configurations for the DLC.

Parameter Required Type Default Description
name Y String Name of the topic.
filePattern String Path matcher.
schemaPath String Path to schema.
columns List<String> Columns will implicitly come from the store which is being published to. The order of columns in the file. If a column name matches a datastore column, its parser will be implied. For columns that do not match a datastore column, you must provide a parser in the channel as a Custom Field. Columns without a matching datastore column or parser are skipped.
channels Set<ChannelDescription> A channel is created using the topic’s name as the name of the target Channel Descriptions which belong to the topic.
restrictToSources Set<String> Sources to which topic is restricted. See source to topic matching.
restrictFromSources Set<String> Sources from which topic is restricted. See source to topic matching.

Java Example

This configuration does not specify a target for the data.

note

If you do not name your topic the same as your store you will have to explicitly specify the target in the channel of the topic.

  • The target is implicitly the Atoti table named “Trades”.
  • The format comes from the schema file specified in the configuration.
@Bean
public AvroTopicDescription tradesTopic() {
    return AvroTopicDescription.builder("Trades", "glob:trades*.avro", "schemas/schema.avsc")
            .build();
}