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ReadNext

Semantics

The ReadNext player type corresponds to data being read sequentially from the front of a sequential file. Since a sequential file is a passive object that simply contains data, there is no corresponding implementation of this player type in the underlying implementation of a system. It represents an abstraction in UniCon used to describe the action of data being read from a file.

Data can be read sequentially from a file in UniCon by a Filter component via a Pipe connection, and by a Module component via a FileIO connection. The ReadNext player type describes data being read from a file in either situation.

Component Types In

A player of type ReadNext can legally be defined in components of the following types:

Role Type
Associations

A player of type ReadNext can legally be associated with the following role types in connections of the specified type:

Properties

The following properties can be legally included in the property list of a ReadNext player:

The syntax for the MaxAssocs property in a ReadNext player is a single <integer> surrounded by parentheses:

MAXASSOCS (1)
The syntax for the MinAssocs property in a ReadNext player is a single <integer> surrounded by parentheses:

MINASSOCS (1)

Implementation Considerations

There are no implementation considerations for this player type because there is no correspondence between a ReadNext player type and anything in the underlying implementation of a system.


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Next: RoutineCall
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Author: Gregory Zelesnik

Last Modified: May 12, 1996