| package org.apache.helix.examples; |
| |
| import org.apache.helix.NotificationContext; |
| import org.apache.helix.model.Message; |
| import org.apache.helix.participant.statemachine.StateModel; |
| import org.apache.helix.participant.statemachine.StateModelFactory; |
| import org.apache.helix.participant.statemachine.StateModelInfo; |
| import org.apache.helix.participant.statemachine.Transition; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| public class BrokerResourceOnlineOfflineStateModelFactory extends StateModelFactory<StateModel> { |
| private static final Logger LOGGER = LoggerFactory.getLogger(BrokerResourceOnlineOfflineStateModelFactory.class); |
| |
| public BrokerResourceOnlineOfflineStateModelFactory() { |
| |
| } |
| |
| public static String getStateModelDef() { |
| return "BrokerResourceOnlineOfflineStateModel"; |
| } |
| |
| public StateModel createNewStateModel(String resourceName) { |
| return new BrokerResourceOnlineOfflineStateModelFactory.BrokerResourceOnlineOfflineStateModel(); |
| } |
| |
| @StateModelInfo( |
| states = {"{'OFFLINE','ONLINE', 'DROPPED'}"}, |
| initialState = "OFFLINE" |
| ) |
| public class BrokerResourceOnlineOfflineStateModel extends StateModel { |
| public BrokerResourceOnlineOfflineStateModel() { |
| } |
| |
| @Transition( |
| from = "OFFLINE", |
| to = "ONLINE" |
| ) |
| public void onBecomeOnlineFromOffline(Message message, NotificationContext context) { |
| LOGGER.info("Become Online from Offline"); |
| } |
| |
| @Transition( |
| from = "ONLINE", |
| to = "OFFLINE" |
| ) |
| public void onBecomeOfflineFromOnline(Message message, NotificationContext context) { |
| LOGGER.info("Become Offline from Online"); |
| |
| } |
| |
| @Transition( |
| from = "OFFLINE", |
| to = "DROPPED" |
| ) |
| public void onBecomeDroppedFromOffline(Message message, NotificationContext context) { |
| LOGGER.info("Become Dropped from Offline"); |
| } |
| |
| @Transition( |
| from = "ONLINE", |
| to = "DROPPED" |
| ) |
| public void onBecomeDroppedFromOnline(Message message, NotificationContext context) { |
| LOGGER.info("Become Dropped from Online"); |
| } |
| |
| @Transition( |
| from = "ERROR", |
| to = "OFFLINE" |
| ) |
| public void onBecomeOfflineFromError(Message message, NotificationContext context) { |
| LOGGER.info("Become Offline from Error"); |
| } |
| } |
| } |
| |