| package org.apache.helix.examples; |
| |
| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| 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"); |
| } |
| } |
| } |
| |