Key Terms and Concepts

Events, projects, streams and windows, and continuous queries are the basics of data-flow programming in Event Stream Processor.

• Events
  A business event is a message that contains information about an actual business event that occurred. Many business systems produce streams of such events as things happen.
• ESP Projects: Streams, Windows, Adapters, and Continuous Queries
  An ESP project is like an application, consisting of a set of event streams, any other required datasources, and the business logic applied to incoming event data to produce results.
• Streams and Windows
  Both streams and windows process events. The difference is that windows have state, meaning they can retain and store data, while streams are stateless and cannot.
• Data-Flow Programming
  SAP Sybase Event Stream Processor uses data-flow programming for processing event streams.
• Getting Results from an ESP Project
  Event Stream Processor has four ways to get output from a running project.
• Operation Codes
  The operation code (opcode) of an event record specifies the action to perform on the underlying store of a window for that event.