Wei-Che Wei created FLINK-5982:
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             Summary: Refactor AbstractInvokable and StatefulTask
                 Key: FLINK-5982
                 URL: https://issues.apache.org/jira/browse/FLINK-5982
             Project: Flink
          Issue Type: Improvement
          Components: Distributed Coordination, State Backends, Checkpointing
    Affects Versions: 1.2.0
            Reporter: Wei-Che Wei
            Assignee: Wei-Che Wei


Currently, running a invokable in {{Task}} needs to call 
{{setEnvironment(env)}} and {{invoke()}}. If the invokable is also a 
{{StatefulTask}}, it need to call {{setInitialState(state)}}. That makes the 
difficulty in doing the eager initialization on invokable during {{DEPLOYING}} 
state. One solution discussed in FLINK-4714 is to separate {{invoke()}} into 
{{open()}} and {{invoke()}}, but that makes the complexity for running it in 
{{Task}}.

This task wants to refactor {{AbstractInvokable}} and {{StatefulTask}} to make 
it easier to construct and run an invokable.

# Refactor abstract class to have one default constructor.
#* Remove {{setEnvironment(env)}} and change {{AbstractInvokable}} to have one 
argument constructor with {{Environment}}.
#* Remove {{setInitialState}} and create a new abstract class 
{{AbstractStatefulInvokable}} to inherit {{AbstractInvokable}} and implement 
{{StatefulTask}}. Make {{AbstractStatefulInvokable}} have a two argument 
constructor with {{Environment}} and {{TaskStateHandles}}.
# Update all subclass
#* Make all subclass of only {{AbstractInvokable}} have an one argument 
constructor and call the constructor in {{AbstractInvokable}}.
#* Make all subclass of {{AbstractInvokable}} and {{StatefulTask}} to inherit 
{{AbstractStatefulInvokable}} and have two two argument constructor.
# Change the creation of the invokables to call that constructor, update all 
the tests



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