IBM Streams 4.3.0
Streams and windows
Streams are sequences of data that flow between operators in a stream processing application.
In logical terms, the data in a stream is a sequence of tuples. Tuples are collections of attributes. Typically, data in a tuple represents the state of something at a point in time, for example, a quote from a stock ticker, or a reading from a temperature sensor.
A stream can be an infinite sequence of tuples, such as a stream for a traffic flow sensor. Alternatively, a stream can be finite, such as a stream that is created from the contents of a file. When a streams processing application contains infinite streams, the application runs continuously without ending.
Operators process an input stream in one of the following logical modes.
- As each tuple is received
- As a window