<commit_before># Components System

The Components system is used to assemble the pieces in a systems calculation.
For example, it can be used to put together a network of pipes and 0-D models
in a thermal hydraulics system. Components perform a number of tasks, including
the following:

- Adding mesh(es),
- Adding variables,
- Adding initial conditions, and
- Adding equations (kernels, boundary conditions, constraints, etc.).

Thus, applications using this system typically do not require the user to create
any of the corresponding blocks in their input files.

!syntax list /Components objects=True actions=False subsystems=False

!syntax list /Components objects=False actions=False subsystems=True

!syntax list /Components objects=False actions=True subsystems=False<commit_msg>Added some documentation for methods of Component<commit_after># Components System

The Components system is used to assemble the pieces in a systems calculation.
For example, it can be used to put together a network of pipes and 0-D models
in a thermal hydraulics system. Components perform a number of tasks, including
the following:

- Adding mesh(es),
- Adding variables,
- Adding initial conditions, and
- Adding equations (kernels, boundary conditions, constraints, etc.).

Thus, applications using this system typically do not require the user to create
any of the corresponding blocks in their input files.

## Implementation

The following methods are available to implement for a component, in the order
in which they are called:

- `setupMesh()`: This performs any mesh setup such as creating meshes or naming mesh sets.
- `init()`: This performs any initialization steps that are not safe to perform
  in the constructor. This typically used when other component(s) need to have
  been constructed first.
- `initSecondary()`: This performs secondary initialization step(s) that require
  `init()` to have been called on other component(s).
- `check()`: This performs checks on the component, logging warnings and errors.
- `addVariables()`: This is used to add variables to the simulation.
- `addMooseObjects()`: This is used to add MOOSE objects to the simulation.

If a component's methods should be called after those of another, then the
first component can add the second, called `other_component` here, as a dependency:

```
addDependency("other_component");
```

This should be done in the constructor.

## Objects and Associated Actions

!syntax list /Components objects=True actions=False subsystems=False

!syntax list /Components objects=False actions=False subsystems=True

!syntax list /Components objects=False actions=True subsystems=False
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