Engine State

class eagerx.core.entities.EngineState(ns, name, simulator, backend, params)

Baseclass for engine states.

Use this baseclass to implement engine states for an Object.

Users must call make() to make the subclass’ specification.

Subclasses must implement the following methods:

• make()

• initialize()

• reset()

classmethod info(method=None)

A helper method to get info on a method of the specified subclass.

Parameters

method (Union[List[str], str, None]) – The registered method we would like to receive info on. If no method is specified, it provides info on the class itself.

Return type

str

Returns

Info on the subclass’ method.

abstract initialize(spec, simulator)

An abstract method to initialize the engine state.

Parameters

• spec (EngineStateSpec) – The engine state specification.

• simulator (Any) – A reference to the engine’s simulator.

Return type

None

abstract classmethod make(*args, **kwargs)

An abstract method that makes the specification (also referred to as spec) of this entity.

Parameters

• args (Any) – Arguments to the subclass’ make function.

• kwargs (Any) – Optional Arguments to the subclass’ make function.

Returns

A (mutable) spec that can be used to build and subsequently initialize the entity (e.g. node, engine, …).

abstract reset(state)

An abstract method to reset the engine state of an Object.

Parameters

state (Any) – The desired state that the user can specify before calling reset().

Return type

None

backend

Responsible for all I/O communication within this process.

name

Name of the state.

ns

Namespace of the environment. Can be set with the name argument to BaseEnv.