| 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 SegmentOnlineOfflineStateModelFactory extends StateModelFactory<StateModel> { |
| public SegmentOnlineOfflineStateModelFactory() { |
| } |
| |
| @Override |
| public StateModel createNewStateModel(String partitionName) { |
| final SegmentOnlineOfflineStateModel SegmentOnlineOfflineStateModel = new SegmentOnlineOfflineStateModel(); |
| return SegmentOnlineOfflineStateModel; |
| } |
| |
| @StateModelInfo(states = "{'OFFLINE','ONLINE', 'DROPPED'}", initialState = "OFFLINE") |
| public static class SegmentOnlineOfflineStateModel extends StateModel { |
| private static final Logger LOGGER = LoggerFactory.getLogger(SegmentOnlineOfflineStateModel.class); |
| |
| @Transition(from = "OFFLINE", to = "ONLINE") |
| public void onBecomeOnlineFromOffline(Message message, NotificationContext context) { |
| LOGGER.info("Become Online from Offline"); |
| } |
| |
| // Remove segment from InstanceDataManager. |
| // Still keep the data files in local. |
| @Transition(from = "ONLINE", to = "OFFLINE") |
| public void onBecomeOfflineFromOnline(Message message, NotificationContext context) { |
| LOGGER.info("Become Offline from Online"); |
| |
| } |
| |
| // Delete segment from local directory. |
| @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"); |
| |
| } |
| } |
| |
| } |