SPL File types.spl

Toolkits > com.ibm.streamsx.topology 2.1.0 > com.ibm.streamsx.topology > types.spl

Interchangeable SPL types. SPL tuple types that can be used to interchange streams between IBM Streams applications implemented in different languages, such as SPL, Python, Java & Scala.

SPL uses structural equivalence for types, which means that types of the same structural composition are considered identical. This means that another toolkit or application need not use these type definitions, and thus can avoid being dependent on this toolkit. For example all these streams definitions are identical:

Content

Types

• Blob: Tuple type representing binary tuples.
• Json: Tuple type for representing JSON.
• String: Tuple type representing string tuples.
• XML: Tuple type representing XML tuples.

Types

Json

Tuple type for representing JSON.

Using this schema in an SPL application with com.ibm.streamsx.topology.topic::Publish and com.ibm.streamsx.topology.topic::Subscribe allows exchange of tuples between SPL, Python, Java & Scala. SPL applications can use the com.ibm.streamsx.json toolkit to convert SPL tuples into JSON.

Any stream published by a Python application using schema.CommonSchema.Json will have this schema.

Any stream of type TStream<JSONObject> published by a Java application will have this schema.

Any stream of type TStream[JSONObject] published by a Scala application will have this schema.

Json = rstring jsonString;

String

Tuple type representing string tuples.

Using this schema in an SPL application with com.ibm.streamsx.topology.topic::Publish and com.ibm.streamsx.topology.topic::Subscribe allows exchange of tuples between SPL, Python, Java & Scala.

Any stream published by a Python application using schema.CommonSchema.String will have this schema.

Any stream of type TStream<String> published by a Java application will have this schema.

Any stream of type TStream[String] published by a Scala application will have this schema.

String = rstring string;

XML

Tuple type representing XML tuples.

Using this schema in an SPL application with com.ibm.streamsx.topology.topic::Publish and com.ibm.streamsx.topology.topic::Subscribe allows exchange of tuples between SPL, Java & Scala.

Any stream of type TStream<com.ibm.streams.operator.types.XML> published by a Java application will have this schema.

Any stream of type TStream[com.ibm.streams.operator.types.XML] published by a Scala application will have this schema.

XML = xml document;

Blob

Tuple type representing binary tuples.

Using this schema in an SPL application with com.ibm.streamsx.topology.topic::Publish and com.ibm.streamsx.topology.topic::Subscribe allows exchange of tuples between SPL, Java & Scala.

Any stream of type TStream<com.ibm.streams.operator.types.Blob> published by a Java application will have this schema.

Any stream of type TStream[com.ibm.streams.operator.types.Blob] published by a Scala application will have this schema.

Blob = blob binary;