ActorSystem

All Known Implementing Classes:

ActorSystemAdapter, ActorSystemImpl
```
public interface ActorSystem<T>
```
An ActorSystem is home to a hierarchy of Actors. It is created using ActorSystem$ apply from a Props object that describes the root Actor of this hierarchy and which will create all other Actors beneath it. A system also implements the ActorRef type, and sending a message to the system directs that message to the root Actor.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method and Description
`<U> ActorRef<U>`	`deadLetters()` The deadLetter address is a destination that will accept (and discard) every message sent to it.
`Dispatchers`	`dispatchers()` Facilities for lookup up thread-pools from configuration.
`DynamicAccess`	`dynamicAccess()` ClassLoader wrapper which is used for reflective accesses internally.
`EventStream`	`eventStream()` Main event bus of this actor system, used for example for logging.
`scala.concurrent.ExecutionContextExecutor`	`executionContext()` The default thread pool of this ActorSystem, configured with settings in `akka.actor.default-dispatcher`.
`LoggingAdapter`	`log()` A `LoggingAdapter` that can be used to emit log messages without specifying a more detailed source.
`void`	`logConfiguration()` Log the configuration.
`LoggingFilter`	`logFilter()` A reference to this system’s logFilter, which filters usage of the `log()` `LoggingAdapter` such that only permissible messages are sent via the `eventStream()`.
`java.lang.String`	`name()` The name of this actor system, used to distinguish multiple ones within the same JVM & class loader.
`java.lang.String`	`printTree()` Create a string representation of the actor hierarchy within this system.
`Scheduler`	`scheduler()` A generic scheduler that can initiate the execution of tasks after some delay.
`Settings`	`settings()` The core settings extracted from the supplied configuration.
`long`	`startTime()` Start-up time in milliseconds since the epoch.
`<U> scala.concurrent.Future<ActorRef<U>>`	`systemActorOf(Behavior<U> behavior, java.lang.String name, DeploymentConfig deployment, Timeout timeout)` Ask the system guardian of this system to create an actor from the given behavior and deployment and with the given name.
`scala.concurrent.Future<Terminated>`	`terminate()` Terminates this actor system.
`java.util.concurrent.ThreadFactory`	`threadFactory()` A ThreadFactory that can be used if the transport needs to create any Threads
`long`	`uptime()` Up-time of this actor system in seconds.
`scala.concurrent.Future<Terminated>`	`whenTerminated()` Returns a Future which will be completed after the ActorSystem has been terminated and termination hooks have been executed.

- Method Detail
 - name
```
java.lang.String name()
```
 The name of this actor system, used to distinguish multiple ones within the same JVM & class loader.
 
 Returns:
 
 (undocumented)
 - settings
```
Settings settings()
```
 The core settings extracted from the supplied configuration.
 
 Returns:
 
 (undocumented)
 - logConfiguration
```
void logConfiguration()
```
 Log the configuration.
 - logFilter
```
LoggingFilter logFilter()
```
 A reference to this system’s logFilter, which filters usage of the log() LoggingAdapter such that only permissible messages are sent via the eventStream(). The default implementation will just test that the message is suitable for the current log level.
 
 Returns:
 
 (undocumented)
 - log
```
LoggingAdapter log()
```
 A LoggingAdapter that can be used to emit log messages without specifying a more detailed source. Typically it is desirable to construct a dedicated LoggingAdapter within each Actor from that Actor’s ActorRef in order to identify the log messages.
 
 Returns:
 
 (undocumented)
 - startTime
```
long startTime()
```
 Start-up time in milliseconds since the epoch.
 
 Returns:
 
 (undocumented)
 - uptime
```
long uptime()
```
 Up-time of this actor system in seconds.
 
 Returns:
 
 (undocumented)
 - threadFactory
```
java.util.concurrent.ThreadFactory threadFactory()
```
 A ThreadFactory that can be used if the transport needs to create any Threads
 
 Returns:
 
 (undocumented)
 - dynamicAccess
```
DynamicAccess dynamicAccess()
```
 ClassLoader wrapper which is used for reflective accesses internally. This is set to use the context class loader, if one is set, or the class loader which loaded the ActorSystem implementation. The context class loader is also set on all threads created by the ActorSystem, if one was set during creation.
 
 Returns:
 
 (undocumented)
 - scheduler
```
Scheduler scheduler()
```
 A generic scheduler that can initiate the execution of tasks after some delay. It is recommended to use the ActorContext’s scheduling capabilities for sending messages to actors instead of registering a Runnable for execution using this facility.
 
 Returns:
 
 (undocumented)
 - eventStream
```
EventStream eventStream()
```
 Main event bus of this actor system, used for example for logging.
 
 Returns:
 
 (undocumented)
 - dispatchers
```
Dispatchers dispatchers()
```
 Facilities for lookup up thread-pools from configuration.
 
 Returns:
 
 (undocumented)
 - executionContext
```
scala.concurrent.ExecutionContextExecutor executionContext()
```
 The default thread pool of this ActorSystem, configured with settings in akka.actor.default-dispatcher.
 
 Returns:
 
 (undocumented)
 - terminate
```
scala.concurrent.Future<Terminated> terminate()
```
 Terminates this actor system. This will stop the guardian actor, which in turn will recursively stop all its child actors, then the system guardian (below which the logging actors reside).
 
 Returns:
 
 (undocumented)
 - whenTerminated
```
scala.concurrent.Future<Terminated> whenTerminated()
```
 Returns a Future which will be completed after the ActorSystem has been terminated and termination hooks have been executed.
 
 Returns:
 
 (undocumented)
 - deadLetters
```
 ActorRef deadLetters()
```
 The deadLetter address is a destination that will accept (and discard) every message sent to it.
 
 Returns:
 
 (undocumented)
 - printTree
```
java.lang.String printTree()
```
 Create a string representation of the actor hierarchy within this system.
 The format of the string is subject to change, i.e. no stable “API”.
 
 Returns:
 
 (undocumented)
 - systemActorOf
```
 scala.concurrent.Future<ActorRef> systemActorOf(Behavior behavior,
 java.lang.String name,
 DeploymentConfig deployment,
 Timeout timeout)
```
 Ask the system guardian of this system to create an actor from the given behavior and deployment and with the given name. The name does not need to be unique since the guardian will prefix it with a running number when creating the child actor. The timeout sets the timeout used for the AskPattern$ invocation when asking the guardian.
 The returned Future of ActorRef may be converted into an ActorRef to which messages can immediately be sent by using the ActorRef$apply method.
 
 Parameters:
 
 behavior - (undocumented)
 
 name - (undocumented)
 
 deployment - (undocumented)
 
 timeout - (undocumented)
 
 Returns:
 
 (undocumented)

Interface ActorSystem<T>

Method Summary

Method Detail

name

settings

logConfiguration

logFilter

log

startTime

uptime

threadFactory

dynamicAccess

scheduler

eventStream

dispatchers

executionContext

terminate

whenTerminated

deadLetters

printTree

systemActorOf