org.springframework.statemachine.cluster

Class LeaderZookeeperStateMachineEnsemble<S,E>

java.lang.Object

org.springframework.statemachine.support.LifecycleObjectSupport

org.springframework.statemachine.ensemble.StateMachineEnsembleObjectSupport<S,E>

org.springframework.statemachine.zookeeper.ZookeeperStateMachineEnsemble<S,E>

org.springframework.statemachine.cluster.LeaderZookeeperStateMachineEnsemble<S,E>

Type Parameters:

S - the type of state

E - the type of event

All Implemented Interfaces:

org.springframework.beans.factory.Aware, org.springframework.beans.factory.BeanFactoryAware, org.springframework.beans.factory.DisposableBean, org.springframework.beans.factory.InitializingBean, org.springframework.context.Lifecycle, org.springframework.context.Phased, org.springframework.context.SmartLifecycle, StateMachineEnsemble<S,E>

public class LeaderZookeeperStateMachineEnsemble<S,E>
extends ZookeeperStateMachineEnsemble<S,E>

StateMachineEnsemble backed by a zookeeper and leader functionality from a Spring Cloud Cluster.

Author:

Janne Valkealahti

Constructor Summary

Constructors

Constructor and Description
LeaderZookeeperStateMachineEnsemble(org.apache.curator.framework.CuratorFramework curatorClient, java.lang.String basePath) Instantiates a new leader zookeeper state machine ensemble.
LeaderZookeeperStateMachineEnsemble(org.apache.curator.framework.CuratorFramework curatorClient, java.lang.String basePath, boolean cleanState, int logSize) Instantiates a new leader zookeeper state machine ensemble.

Method Summary

Modifier and Type	Method and Description
StateMachine<S,E>	getLeader() Gets the ensemble leader.
void	join(StateMachine<S,E> stateMachine) Request a join to a state machine ensemble.
void	leave(StateMachine<S,E> stateMachine) Request a leave from an ensemble.

Methods inherited from class org.springframework.statemachine.zookeeper.ZookeeperStateMachineEnsemble

doStart, doStop, getState, onInit, registerWatcherForStatePath, setState, toString

Methods inherited from class org.springframework.statemachine.ensemble.StateMachineEnsembleObjectSupport

addEnsembleListener, notifyError, notifyGranted, notifyJoined, notifyLeft, notifyRevoked, notifyStateChanged, removeEnsembleListener

Methods inherited from class org.springframework.statemachine.support.LifecycleObjectSupport

afterPropertiesSet, destroy, doDestroy, getBeanFactory, getPhase, getTaskExecutor, getTaskScheduler, isAutoStartup, isRunning, setAutoStartup, setBeanFactory, setPhase, setTaskExecutor, setTaskScheduler, start, stop, stop

Methods inherited from class java.lang.Object

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

Constructor Detail

LeaderZookeeperStateMachineEnsemble

public LeaderZookeeperStateMachineEnsemble(org.apache.curator.framework.CuratorFramework curatorClient,
                                           java.lang.String basePath)

Instantiates a new leader zookeeper state machine ensemble.

Parameters:

curatorClient - the curator client

basePath - the base zookeeper path

LeaderZookeeperStateMachineEnsemble

public LeaderZookeeperStateMachineEnsemble(org.apache.curator.framework.CuratorFramework curatorClient,
                                           java.lang.String basePath,
                                           boolean cleanState,
                                           int logSize)

Instantiates a new leader zookeeper state machine ensemble.

Parameters:

curatorClient - the curator client

basePath - the base zookeeper path

cleanState - if true clean existing state

logSize - the log size

Method Detail

join

public void join(StateMachine<S,E> stateMachine)

Description copied from interface: StateMachineEnsemble

Request a join to a state machine ensemble. This method is a request to join an ensemble and doesn't guarantee a requester will eventually successfully join. Join operation needs to be used together with EnsembleListener and EnsembleListener.stateMachineJoined(StateMachine, StateMachineContext) is called with a StateMachine instance for successful join.

Specified by:

join in interface StateMachineEnsemble<S,E>

Overrides:

join in class ZookeeperStateMachineEnsemble<S,E>

Parameters:

stateMachine - the state machine

leave

public void leave(StateMachine<S,E> stateMachine)

Description copied from interface: StateMachineEnsemble

Request a leave from an ensemble. This method is a request to leave an ensemble. After this method is called no further processing is done for a instance of StateMachine. Additionally EnsembleListener.stateMachineLeft(StateMachine, StateMachineContext) is called when leave request is fully processed.

Specified by:

leave in interface StateMachineEnsemble<S,E>

Overrides:

leave in class ZookeeperStateMachineEnsemble<S,E>

Parameters:

stateMachine - the state machine

getLeader

public StateMachine<S,E> getLeader()

Description copied from interface: StateMachineEnsemble

Gets the ensemble leader. If returned machine is NULL it indicates that this ensemble doesn't know any leader.

Specified by:

getLeader in interface StateMachineEnsemble<S,E>

Overrides:

getLeader in class ZookeeperStateMachineEnsemble<S,E>

Returns:

the ensemble leader