org.elasticsearch.common.component

Class Lifecycle

java.lang.Object

org.elasticsearch.common.component.Lifecycle

public class Lifecycle
extends Object

Lifecycle state. Allows the following transitions:

• INITIALIZED -> STARTED, STOPPED, CLOSED
• STARTED -> STOPPED
• STOPPED -> STARTED, CLOSED
• CLOSED ->

Also allows to stay in the same state. For example, when calling stop on a component, the following logic can be applied:

 public void stop() {
  if (!lifeccycleState.moveToStopped()) {
      return;
  }
 // continue with stop logic
 }
 

Note, closed is only allowed to be called when stopped, so make sure to stop the component first. Here is how the logic can be applied:

 public void close() {
  if (lifecycleState.started()) {
      stop();
  }
  if (!lifecycleState.moveToClosed()) {
      return;
  }
  // perofrm close logic here
 }
 

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	Lifecycle.State

Constructor Summary

Constructors

Constructor and Description
Lifecycle()

Method Summary

Modifier and Type	Method and Description
boolean	canMoveToClosed()
boolean	canMoveToStarted()
boolean	canMoveToStopped()
boolean	closed() Returns true if the state is closed.
boolean	initialized() Returns true if the state is initialized.
boolean	moveToClosed()
boolean	moveToStarted()
boolean	moveToStopped()
boolean	started() Returns true if the state is started.
Lifecycle.State	state()
boolean	stopped() Returns true if the state is stopped.
boolean	stoppedOrClosed()
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

Lifecycle

public Lifecycle()

Method Detail

state

public Lifecycle.State state()

initialized

public boolean initialized()

Returns true if the state is initialized.

started

public boolean started()

Returns true if the state is started.

stopped

public boolean stopped()

Returns true if the state is stopped.

closed

public boolean closed()

Returns true if the state is closed.

stoppedOrClosed

public boolean stoppedOrClosed()

canMoveToStarted

public boolean canMoveToStarted()
                         throws IllegalStateException

Throws:

IllegalStateException

moveToStarted

public boolean moveToStarted()
                      throws IllegalStateException

Throws:

IllegalStateException

canMoveToStopped

public boolean canMoveToStopped()
                         throws IllegalStateException

Throws:

IllegalStateException

moveToStopped

public boolean moveToStopped()
                      throws IllegalStateException

Throws:

IllegalStateException

canMoveToClosed

public boolean canMoveToClosed()
                        throws IllegalStateException

Throws:

IllegalStateException

moveToClosed

public boolean moveToClosed()
                     throws IllegalStateException

Throws:

IllegalStateException

toString

public String toString()

Overrides:

toString in class Object