Package org.apache.nifi.controller.service

Class ServiceStateTransition

java.lang.Object

org.apache.nifi.controller.service.ServiceStateTransition

public class ServiceStateTransition
extends Object

Field Summary

Fields

Modifier and Type	Field	Description
private final ControllerServiceNode	controllerServiceNode
private final List<CompletableFuture<?>>	disabledFutures
private final List<CompletableFuture<?>>	enabledFutures
private static final org.slf4j.Logger	logger
private final Lock	readLock
private final ReadWriteLock	rwLock
private ControllerServiceState	state
private final Condition	stateChangeCondition
private final Lock	writeLock

Constructor Summary

Constructors

Constructor	Description
ServiceStateTransition(ControllerServiceNode controllerServiceNode)

Method Summary

Modifier and Type	Method	Description
boolean	awaitCondition(BooleanSupplier predicate, long timePeriod, TimeUnit timeUnit, String desiredConditionDescription)	Waits up to the specified max amount of time for the given predicate to become true.
boolean	awaitState(ControllerServiceState desiredState, long timePeriod, TimeUnit timeUnit)
boolean	awaitStateOrInvalid(ControllerServiceState desiredState, long timePeriod, TimeUnit timeUnit)
void	disable()
boolean	enable(ControllerServiceReference controllerServiceReference)
ControllerServiceState	getState()
void	signalInvalid()
boolean	transitionToDisabling(ControllerServiceState expectedState, CompletableFuture<?> disabledFuture)
boolean	transitionToEnabling(ControllerServiceState expectedState, CompletableFuture<?> enabledFuture)

Methods inherited from class java.lang.Object

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

Field Details

logger

private static final org.slf4j.Logger logger

state

private ControllerServiceState state

enabledFutures

private final List<CompletableFuture<?>> enabledFutures

disabledFutures

private final List<CompletableFuture<?>> disabledFutures

controllerServiceNode

private final ControllerServiceNode controllerServiceNode

rwLock

private final ReadWriteLock rwLock

writeLock

private final Lock writeLock

readLock

private final Lock readLock

stateChangeCondition

private final Condition stateChangeCondition

Constructor Details

ServiceStateTransition

public ServiceStateTransition(ControllerServiceNode controllerServiceNode)

Method Details

transitionToEnabling

public boolean transitionToEnabling(ControllerServiceState expectedState,
 CompletableFuture<?> enabledFuture)

enable

public boolean enable(ControllerServiceReference controllerServiceReference)

transitionToDisabling

public boolean transitionToDisabling(ControllerServiceState expectedState,
 CompletableFuture<?> disabledFuture)

disable

public void disable()

getState

public ControllerServiceState getState()

awaitCondition

public boolean awaitCondition(BooleanSupplier predicate,
 long timePeriod,
 TimeUnit timeUnit,
 String desiredConditionDescription)
                       throws InterruptedException

Waits up to the specified max amount of time for the given predicate to become true.

Parameters:

predicate - the condition under which the wait should stop

timePeriod - the max period of time to wait

timeUnit - the time unit associated with the time period

Returns:

true if the predicate becomes true before the given time period, false if the time period elapses first

Throws:

InterruptedException - if interrupted while waiting for the condition to become true

awaitState

public boolean awaitState(ControllerServiceState desiredState,
 long timePeriod,
 TimeUnit timeUnit)
                   throws InterruptedException

Throws:

InterruptedException

awaitStateOrInvalid

public boolean awaitStateOrInvalid(ControllerServiceState desiredState,
 long timePeriod,
 TimeUnit timeUnit)
                            throws InterruptedException

Throws:

InterruptedException

signalInvalid

public void signalInvalid()