ExecutableGraph (Apache Beam 2.8.0)

```
public interface ExecutableGraph<ExecutableT,CollectionT>
```
The interface that enables querying of a graph of independently executable stages and the inputs and outputs of those stages.
Similar to QueryablePipeline. This exists primarily for legacy reasons, as an adapter interface between the 'native' and 'portable' execution models that the DirectRunner supports.

All Methods Instance Methods Abstract Methods
Modifier and Type	Method and Description
`java.util.Collection<ExecutableT>`	`getExecutables()`
`java.util.Collection<ExecutableT>`	`getPerElementConsumers(CollectionT pCollection)`
`java.util.Collection<CollectionT>`	`getPerElementInputs(ExecutableT transform)`
`java.util.Collection<CollectionT>`	`getProduced(ExecutableT producer)`
`ExecutableT`	`getProducer(CollectionT collection)`
`java.util.Collection<ExecutableT>`	`getRootTransforms()`

java.util.Collection<ExecutableT> getRootTransforms()

java.util.Collection<ExecutableT> getExecutables()

ExecutableT getProducer(CollectionT collection)

java.util.Collection<CollectionT> getProduced(ExecutableT producer)

java.util.Collection<CollectionT> getPerElementInputs(ExecutableT transform)

java.util.Collection<ExecutableT> getPerElementConsumers(CollectionT pCollection)

Interface ExecutableGraph<ExecutableT,CollectionT>