```
public interface Cell
```
INTERNAL API

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`ChildrenContainer`	`childrenRefs()`	All children of this actor, including only reserved-names.
`scala.Option<ChildStats>`	`getChildByName(java.lang.String name)`	Get the stats for the named child, if that exists.
`org.apache.pekko.actor.InternalActorRef`	`getSingleChild(java.lang.String name)`	Method for looking up a single child beneath this actor.
`boolean`	`hasMessages()`	If the actor isLocal, returns whether "user messages" are currently queued, “false” otherwise.
`boolean`	`isLocal()`	Returns true if the actor is local, i.e.
`boolean`	`isTerminated()`	Returns “true” if the actor is locally known to be terminated, “false” if alive or uncertain.
`int`	`numberOfMessages()`	If the actor isLocal, returns the number of "user messages" currently queued, which may be a costly operation, 0 otherwise.
`org.apache.pekko.actor.InternalActorRef`	`parent()`	The supervisor of this actor.
`Props`	`props()`	The props for this actor cell.
`void`	`restart(java.lang.Throwable cause)`	Restart this actor (will recursively restart or stop all children).
`void`	`resume(java.lang.Throwable causedByFailure)`	Recursively resume this actor and all its children.
`ActorRef`	`self()`	The “self” reference which this Cell is attached to.
`void`	`sendMessage(java.lang.Object message, ActorRef sender)`	Enqueue a message to be sent to the actor; may or may not actually schedule the actor to run, depending on which type of cell it is.
`void`	`sendMessage(Envelope msg)`	Enqueue a message to be sent to the actor; may or may not actually schedule the actor to run, depending on which type of cell it is.
`void`	`sendSystemMessage(SystemMessage msg)`	Enqueue a message to be sent to the actor; may or may not actually schedule the actor to run, depending on which type of cell it is.
`Cell`	`start()`	Start the cell: enqueued message must not be processed before this has been called.
`void`	`stop()`	Recursively terminate this actor and all its children.
`void`	`suspend()`	Recursively suspend this actor and all its children.
`ActorSystem`	`system()`	The system within which this Cell lives.
`org.apache.pekko.actor.ActorSystemImpl`	`systemImpl()`	The system internals where this Cell lives.

- Method Detail
  - childrenRefs
```
ChildrenContainer childrenRefs()
```
    All children of this actor, including only reserved-names.
  - getChildByName
```
scala.Option<ChildStats> getChildByName(java.lang.String name)
```
    Get the stats for the named child, if that exists.
  - getSingleChild
```
org.apache.pekko.actor.InternalActorRef getSingleChild(java.lang.String name)
```
    Method for looking up a single child beneath this actor. It is racy if called from the outside.
  - hasMessages
```
boolean hasMessages()
```
    If the actor isLocal, returns whether "user messages" are currently queued, “false” otherwise.
  - isLocal
```
boolean isLocal()
```
    Returns true if the actor is local, i.e. if it is actually scheduled on a Thread in the current JVM when run.
  - isTerminated
```
boolean isTerminated()
```
    Returns “true” if the actor is locally known to be terminated, “false” if alive or uncertain.
  - numberOfMessages
```
int numberOfMessages()
```
    If the actor isLocal, returns the number of "user messages" currently queued, which may be a costly operation, 0 otherwise.
  - parent
```
org.apache.pekko.actor.InternalActorRef parent()
```
    The supervisor of this actor.
  - props
```
Props props()
```
    The props for this actor cell.
  - restart
```
void restart(java.lang.Throwable cause)
```
    Restart this actor (will recursively restart or stop all children). Is only allowed to throw Fatal Throwables.
  - resume
```
void resume(java.lang.Throwable causedByFailure)
```
    Recursively resume this actor and all its children. Is only allowed to throw Fatal Throwables.
  - self
```
ActorRef self()
```
    The “self” reference which this Cell is attached to.
  - sendMessage
```
void sendMessage(Envelope msg)
```
    Enqueue a message to be sent to the actor; may or may not actually schedule the actor to run, depending on which type of cell it is. Is only allowed to throw Fatal Throwables.
  - sendMessage
```
void sendMessage(java.lang.Object message,
                 ActorRef sender)
```
    Enqueue a message to be sent to the actor; may or may not actually schedule the actor to run, depending on which type of cell it is. Is only allowed to throw Fatal Throwables.
  - sendSystemMessage
```
void sendSystemMessage(SystemMessage msg)
```
    Enqueue a message to be sent to the actor; may or may not actually schedule the actor to run, depending on which type of cell it is. Is only allowed to throw Fatal Throwables.
  - start
```
Cell start()
```
    Start the cell: enqueued message must not be processed before this has been called. The usual action is to attach the mailbox to a dispatcher.
  - stop
```
void stop()
```
    Recursively terminate this actor and all its children. Is only allowed to throw Fatal Throwables.
  - suspend
```
void suspend()
```
    Recursively suspend this actor and all its children. Is only allowed to throw Fatal Throwables.
  - system
```
ActorSystem system()
```
    The system within which this Cell lives.
  - systemImpl
```
org.apache.pekko.actor.ActorSystemImpl systemImpl()
```
    The system internals where this Cell lives.

Interface Cell

Method Summary

Method Detail

childrenRefs

getChildByName

getSingleChild

hasMessages

isLocal

isTerminated

numberOfMessages

parent

props

restart

resume

self

sendMessage

sendMessage

sendSystemMessage

start

stop

suspend

system

systemImpl