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Dropwizard integration for working with Apache Helix.

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/**
 * Copyright (C) 2015 Greg Brandt ([email protected])
 *
 * Licensed 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.
 */
package com.github.brandtg.discovery;

import org.apache.helix.NotificationContext;
import org.apache.helix.api.TransitionHandler;
import org.apache.helix.model.Message;
import org.apache.helix.participant.statemachine.StateModelInfo;
import org.apache.helix.participant.statemachine.Transition;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

@StateModelInfo(states = "{'OFFLINE','ONLINE'}", initialState = "OFFINE")
public class HelixServiceDiscoveryStateTransitionHandler extends TransitionHandler {
  private static final Logger LOG = LoggerFactory.getLogger(HelixServiceDiscoveryStateTransitionHandler.class);

  @Transition(from = "OFFLINE", to = "ONLINE")
  public void fromOfflineToOnline(Message message, NotificationContext context) {
    LOG.info("From OFFLINE to ONLINE: {}", message.getPartitionName());
  }

  @Transition(from = "ONLINE", to = "OFFLINE")
  public void fromOnlineToOffline(Message message, NotificationContext context) {
    LOG.info("From ONLINE to OFFLINE: {}", message.getPartitionName());
  }
}