| Origin: |
BMRSS 96 |
| Reason: |
Perform composable transformations and computations on streams.
|
| Synopsis: |
Define a composable
interface common to all transformations and computations.
Make implementations of the interface independent of their contexts.
|
| Example: |
A class that counts the number of bytes and/or lines of a stream.
|
| Solution: |
| Source |
There is both an interface and one or more concrete classes
that abstract a stream that produces data.
Has method to get data.
|
| SourceFilter |
There is both an interface and one or more concrete classes
that abstract filtering a Source.
Has method to set the source and get data.
|
| SinkFilter |
There is both an interface and one or more concrete classes
that abstract filtering a Sink.
Has method to set the sink and put data.
|
| Sink |
There is both an interface and one or more concrete classes
that abstract a stream that consumes data.
Has method to put data. |
|
| See also: |
Decorator
|
| Alternatives: |
Producer puts data to SinkFilter that puts data to Sink.
Consumer gets data from SourceFilter that gets data from Source.
|