software.amazon.kinesis.coordinator.migration

Class MigrationStateMachineImpl

java.lang.Object

software.amazon.kinesis.coordinator.migration.MigrationStateMachineImpl

All Implemented Interfaces:

MigrationStateMachine

@ThreadSafe
public class MigrationStateMachineImpl
extends Object
implements MigrationStateMachine

Implementation of MigrationStateMachine

Field Summary

Fields

Modifier and Type	Field and Description
static String	FAULT_METRIC
static String	METRICS_OPERATION

Constructor Summary

Constructors

Constructor and Description
MigrationStateMachineImpl(MetricsFactory metricsFactory, Callable<Long> timeProvider, CoordinatorStateDAO coordinatorStateDAO, ScheduledExecutorService stateMachineThreadPool, CoordinatorConfig.ClientVersionConfig clientVersionConfig, Random random, DynamicMigrationComponentsInitializer initializer, String workerId, long flipTo3XStabilizerTimeInSeconds)

Method Summary

Modifier and Type	Method and Description
ClientVersion	getCurrentClientVersion() Get the ClientVersion of current state machine state.
void	initialize() Initialize the state machine by identifying the initial state when the KCL worker comes up for the first time.
void	shutdown() Shutdown state machine and perform necessary cleanup for the worker to gracefully shutdown
void	terminate() Terminate the state machine when it reaches a terminal state, which is a successful upgrade to v3.x.
void	transitionTo(ClientVersion nextClientVersion, MigrationState migrationState) Peform transition from current state to the given new ClientVersion

Methods inherited from class java.lang.Object

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

Field Detail

FAULT_METRIC

public static final String FAULT_METRIC

See Also:

Constant Field Values

METRICS_OPERATION

public static final String METRICS_OPERATION

See Also:

Constant Field Values

Constructor Detail

MigrationStateMachineImpl

public MigrationStateMachineImpl(MetricsFactory metricsFactory,
                                 Callable<Long> timeProvider,
                                 CoordinatorStateDAO coordinatorStateDAO,
                                 ScheduledExecutorService stateMachineThreadPool,
                                 CoordinatorConfig.ClientVersionConfig clientVersionConfig,
                                 Random random,
                                 DynamicMigrationComponentsInitializer initializer,
                                 String workerId,
                                 long flipTo3XStabilizerTimeInSeconds)

Method Detail

initialize

public void initialize()
                throws DependencyException

Description copied from interface: MigrationStateMachine

Initialize the state machine by identifying the initial state when the KCL worker comes up for the first time.

Specified by:

initialize in interface MigrationStateMachine

Throws:

DependencyException - When unable to identify the initial state.

shutdown

public void shutdown()

Description copied from interface: MigrationStateMachine

Shutdown state machine and perform necessary cleanup for the worker to gracefully shutdown

Specified by:

shutdown in interface MigrationStateMachine

terminate

public void terminate()

Description copied from interface: MigrationStateMachine

Terminate the state machine when it reaches a terminal state, which is a successful upgrade to v3.x.

Specified by:

terminate in interface MigrationStateMachine

transitionTo

public void transitionTo(ClientVersion nextClientVersion,
                         MigrationState migrationState)
                  throws DependencyException

Description copied from interface: MigrationStateMachine

Peform transition from current state to the given new ClientVersion

Specified by:

transitionTo in interface MigrationStateMachine

Parameters:

nextClientVersion - clientVersion of the new state the state machine must transition to

migrationState - the current MigrationState in dynamo

Throws:

DependencyException - when transition fails due to dependency on DDB failing in unexpected ways.

getCurrentClientVersion

public ClientVersion getCurrentClientVersion()

Description copied from interface: MigrationStateMachine

Get the ClientVersion of current state machine state.

Specified by:

getCurrentClientVersion in interface MigrationStateMachine

Returns:

ClientVersion of current state machine state