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 Custom fields with data stream

Data publishers generally allow you to send data to a predefined set of data fields, to the BAM/CEP server only specified in the stream definitions. This is a set of fixed data fields you send through a data bridge. You can also send custom key-value pairs with data events.

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1. When the key starts with meta: The data field is considered as a metadatacustom metadatacustom field. It is sent with metadata and saved in Cassandra with key prefix meta_.
2. When the key starts with correlation: The data field is considered as a correlation data custom field. It is sent with correlation data and saved in Cassandra with key prefix correlation_.
3. When the key starts with payload or any other string : The data field is considered as a payload data custom field. It is sent with payload data and saved in Cassandra with key prefix payload_.

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<repositories>
    <repository>
        <id>org.wso2.carbon</id>
        <url>http://dist.wso2.org/maven2/</url>
    </repository>
</repositories>

<dependency>
	<groupId>org.wso2.carbon</groupId> 
	<artifactId>org.wso2.carbon.databridge.agent.thrift</artif actId>artifactId> 
	<version>4.2.0</version>
</dependency> 
<dependency>
	<groupId>org.wso2.carbon</groupId> 
	<artifactId>org.wso2.carbon.databridge.commons</artifactId> 
	<version>4.2.0</version> 
</dependency>

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