org.elasticsearch.common.component
Class Lifecycle

java.lang.Object
  org.elasticsearch.common.component.Lifecycle

@ThreadSafe
public class Lifecycle
extends java.lang.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

static class

Lifecycle.State

Constructor Summary

Lifecycle()

Method Summary

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()
java.lang.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 ElasticSearchIllegalStateException

Throws:

ElasticSearchIllegalStateException

moveToStarted

public boolean moveToStarted()
                      throws ElasticSearchIllegalStateException

Throws:

ElasticSearchIllegalStateException

canMoveToStopped

public boolean canMoveToStopped()
                         throws ElasticSearchIllegalStateException

Throws:

ElasticSearchIllegalStateException

moveToStopped

public boolean moveToStopped()
                      throws ElasticSearchIllegalStateException

Throws:

ElasticSearchIllegalStateException

canMoveToClosed

public boolean canMoveToClosed()
                        throws ElasticSearchIllegalStateException

Throws:

ElasticSearchIllegalStateException

moveToClosed

public boolean moveToClosed()
                     throws ElasticSearchIllegalStateException

Throws:

ElasticSearchIllegalStateException

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object