Home
Developing
Learn about different Teracloud Streams tools and features to write, compile, run, and test streams applications.
Developing stream applications
Try out tutorials and explore details about stream application development, SPL features, and best practices.
SPL features
SPL provides features and functions to help you write your applications to fulfill your business needs.

Welcome
Learn about the core capabilities of Teracloud® Streams, its architecture, and key concepts.
Installing
Use this information to install, upgrade, and uninstall the Teracloud® Streams product.
Configuring
Create a basic or an enterprise domain which is a single point for configuring and managing common resources, security, and instances.
Administering
Administer the product by using the Teracloud® Streams graphical user interface, APIs, or the streamtool command-line interface.
Developing
Learn about different Teracloud Streams tools and features to write, compile, run, and test streams applications.
- Development concepts
  Development of stream applications consists of several components such as operators, streams, tuples, Streams Processing Language, toolkits, and more.
- Developing stream applications
  Try out tutorials and explore details about stream application development, SPL features, and best practices.
  - Tutorials
    Learn how to create simple stream applications by completing the tutorials.
  - Application directory files and structure
    Learn about the different files and common directories that make up an SPL application. View the recommended structure so the SPL compiler and other Teracloud® Streams development tools work best.
  - Compiling stream applications
    Stream applications must be compiled before they can be run. Teracloud® Streams offers the SPL compiler (sc program) to compile SPL applications into a Streams application bundle file (SAB) that contains artifacts needed to run the application.
  - Application bundle files
    A Streams application bundle file (SAB) is a single, relocatable file that contains artifacts needed to run your application. The file can be invoked directly to run the application on a single host or submitted to a Streams instance.
  - SPL features
    SPL provides features and functions to help you write your applications to fulfill your business needs.
    - Compile-time arguments
      The SPL compiler, sc command, supports arguments that are passed in at compile time.
    - Submission-time values
      SPL supports submission-time values, which are arguments that are specified at the time of application launch.
    - Using application configuration objects to access secure data
      Use application configuration objects to securely access sensitive configuration items from your Teracloud® Streams environment.
    - User-defined parallelism
      User-defined parallelism, available through the @parallel annotation, allows you to easily take advantage of data-parallelism in your Teracloud® Streams applications.
    - Consistent regions
      Because of business requirements, some applications require that all tuples in an application are processed at least once. You can use a consistent region in your stream applications to avoid data loss due to software or hardware failure and meet your requirements for at-least-once processing.
    - Views
      To make streaming data available to external programs, your SPL application must create at least one view. A view defines the set of attributes that can appear in a specific viewable data stream.
    - Event time
      Event time is a simple model which supports streams processing where time is not derived from the system time of the machine Teracloud® Streams is running on, but from a time value associated with each tuple. In a graph enabled for event time, tuples have an attribute which holds their time value. The time value for each tuple enables operations such as grouping tuples with a time value falling within specified time intervals, and running aggregate calculations on the group.
    - Logging and tracing options
      SPL application developers can write messages to product log and trace files. Log and trace files help administrators, instance owners, application developers, and the support team to identify, diagnose, and resolve problems with the Teracloud® Streams and applications.
  - Best practices
    Use these tips to write operators that perform effectively in their application, and in other applications.
  - Performance recommendations
    You can use these performance options and recommendations to improve your stream application.
- Developing native functions
  Extend SPL's computational capabilities by creating native functions written in C++ or Java.
- Developing custom operators
  Create custom operators if shipped toolkits do not provide the necessary logic or behavior needed for your stream applications.
- Developing custom toolkits
  Bundle and reuse custom functions and operators across several stream applications by creating custom toolkits.
- Working with files
  Applications and operators can read and write to files in several ways. If relative paths are used, the data directory is used as the root of relative paths. To enable logic to access the runtime application or toolkit directory hierarchies, language-specific functions can be used.
- Enabling Streams data exchange
  Teracloud® Streams provides a data exchange REST API for inserting and retrieving tuples within a job to easily integrate with other data services and external applications. Stream applications can enable the data exchange feature by using one or more Endpoint operators.
- Debugging stream applications
  Debug stream applications using the interactive, command line-based Streams Debugger (sdb).
Troubleshooting
Resolve problems with Teracloud® Streams using the troubleshooting tools provided with the product as well as the resources offered by Teracloud Support.
Reference
Find details on the SPL language, toolkits, APIs, commands, and more.
Glossary
Use this glossary to find terms and definitions for Teracloud® Streams.

SPL features

SPL provides features and functions to help you write your applications to fulfill your business needs.