[jira] [Created] (SAMZA-1096) StreamSpec constructors in the ExecutionEnvironments

["Jake Maes (JIRA)" <ji...@apache.org>]

Jake Maes created SAMZA-1096:
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             Summary: StreamSpec constructors in the ExecutionEnvironments
                 Key: SAMZA-1096
                 URL: https://issues.apache.org/jira/browse/SAMZA-1096
             Project: Samza
          Issue Type: Bug
            Reporter: Jake Maes
            Assignee: Jake Maes
             Fix For: 0.13.0


SAMZA-1075 added the notion of a StreamSpec for describing streams to be created, validated, or simply used in a samza application.

SAMZA-1073 added the basic Fluent API but directly instantiated StreamSpecs, which puts undue burden on the user. 

This task is to provide a basic constructor(s) in the ExecutionEnvironments to enable users to easily create a StreamSpec.

Goals:
1. ExecutionEnvironment can influence the type of StreamSpec returned. For example a TestExecutionEnvironment might return a StreamSpec corresponding to an in-memory Collection stream, whereas the production ExecutionEnvironments would return a more scalable option, such as a Kafka StreamSpec.
2. We want 1 constructor which derives everything (type, properties, system, etc) from config. 
3. We want to be able to add convenience constructors for various types, like streamFromFile() for a file impl. These can be added later, but the foundational work should support it.



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